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kepler.gl

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kepler.gl is a webgl based application to visualize large scale location data in the browser

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"use strict"; var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault"); Object.defineProperty(exports, "__esModule", { value: true }); exports.CATEGORICAL_TEXTURE_WIDTH = void 0; exports.bboxIntersects = bboxIntersects; exports.computeZRange = computeZRange; exports.dtypeMaxValue = void 0; exports.filterAvailablePresets = filterAvailablePresets; exports.findAssetWithName = findAssetWithName; exports.generateCategoricalBitmapArray = generateCategoricalBitmapArray; exports.getAssets = getAssets; exports.getBandIdsForCommonNames = getBandIdsForCommonNames; exports.getDataSourceParams = getDataSourceParams; exports.getEOBands = getEOBands; exports.getImageMinMax = getImageMinMax; exports.getMaxRequests = getMaxRequests; exports.getMinMaxFromTile2DHeaders = getMinMaxFromTile2DHeaders; exports.getRasterStatisticsMinMax = getRasterStatisticsMinMax; exports.getSTACBounds = getSTACBounds; exports.getSingleBandPresetOptions = getSingleBandPresetOptions; exports.getUsableAssets = getUsableAssets; exports.isColormapAllowed = isColormapAllowed; exports.isFilterAllowed = isFilterAllowed; exports.isRescalingAllowed = isRescalingAllowed; exports.isSearchableStac = isSearchableStac; exports.timeRangeToStacTemporalInterval = timeRangeToStacTemporalInterval; var _toConsumableArray2 = _interopRequireDefault(require("@babel/runtime/helpers/toConsumableArray")); var _slicedToArray2 = _interopRequireDefault(require("@babel/runtime/helpers/slicedToArray")); var _core = require("@math.gl/core"); var _utils = require("@kepler.gl/utils"); var _config = require("./config"); var _types = require("./types"); function _createForOfIteratorHelper(r, e) { var t = "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (!t) { if (Array.isArray(r) || (t = _unsupportedIterableToArray(r)) || e && r && "number" == typeof r.length) { t && (r = t); var _n = 0, F = function F() {}; return { s: F, n: function n() { return _n >= r.length ? { done: !0 } : { done: !1, value: r[_n++] }; }, e: function e(r) { throw r; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var o, a = !0, u = !1; return { s: function s() { t = t.call(r); }, n: function n() { var r = t.next(); return a = r.done, r; }, e: function e(r) { u = !0, o = r; }, f: function f() { try { a || null == t["return"] || t["return"](); } finally { if (u) throw o; } } }; } function _unsupportedIterableToArray(r, a) { if (r) { if ("string" == typeof r) return _arrayLikeToArray(r, a); var t = {}.toString.call(r).slice(8, -1); return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0; } } function _arrayLikeToArray(r, a) { (null == a || a > r.length) && (a = r.length); for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e]; return n; } // SPDX-License-Identifier: MIT // Copyright contributors to the kepler.gl project /** * Utility functions and constants for processing STAC metadata and other raster tile data */ var CATEGORICAL_TEXTURE_WIDTH = exports.CATEGORICAL_TEXTURE_WIDTH = 256; function isColormapAllowed(bandCombination) { return bandCombination !== _types.BandCombination.Rgb; } function isRescalingAllowed(bandCombination) { return bandCombination === _types.BandCombination.Rgb || bandCombination === _types.BandCombination.Single; } function isFilterAllowed(bandCombination) { return bandCombination !== _types.BandCombination.Rgb; } /** * Max value for data type * * Values of null might be calculated in runtime */ var dtypeMaxValue = exports.dtypeMaxValue = { uint8: Math.pow(2, 8) - 1, uint16: Math.pow(2, 16) - 1, uint32: Math.pow(2, 32) - 1, uint64: null, int8: Math.pow(2, 7) - 1, int16: Math.pow(2, 15) - 1, int32: Math.pow(2, 31) - 1, int64: null, float16: null, float32: null, float64: null, cint16: null, cint32: null, cfloat32: null, cfloat64: null, other: null }; /** * Is this a STAC Collection that supports custom searching * TODO: currently this is a custom hack to support Sentinel. It will need to be generalized before being accessible * @param stac STAC object * @return If True, supports searching */ function isSearchableStac(stac) { return stac.type === 'Collection'; // return stac.type !== 'Feature' && stac?.providers.some( // provider => // provider.name.toLowerCase() === 'microsoft' && // provider.url === 'https://planetarycomputer.microsoft.com' // ); } function getZoomRange(stac) { if (_config.ZOOM_RANGES[stac.id]) { return _config.ZOOM_RANGES[stac.id]; } // For a single COG, having a full zoom range isn't really a problem. // the /cog/info endpoint doesn't describe zoom levels because it doesn't know the projection to serve the image in. // Default minzoom, maxzoom: [0, 20] return [0, 20]; } /** * Infer data type from STAC item * This uses the `raster` extension, which is not yet very common * @param stac stac object * @return Data type of the band */ function getDataType(usableAssets, typesToCheck) { var dataTypes = new Set(); for (var assetName in usableAssets) { var _asset$rasterBands; var asset = usableAssets[assetName]; if (!asset) { continue; } if (typesToCheck && !typesToCheck.includes(assetName)) { continue; } (_asset$rasterBands = asset['raster:bands']) === null || _asset$rasterBands === void 0 || _asset$rasterBands.forEach(function (band) { return band.data_type && dataTypes.add(band.data_type); }); } // TODO: support multiple data types across assets if (dataTypes.size !== 1) { return null; } return Array.from(dataTypes)[0]; } /** * Get min and max values of the band from the band's data type values range * @param stac - stac metadata object * @param dtype - data type of the raster band * @returns min and max values for the band */ function getPixelRange(stac, dtype, _ref) { var _ref2 = (0, _slicedToArray2["default"])(_ref, 2), minRasterStatsValue = _ref2[0], maxRasterStatsValue = _ref2[1]; if (!dtype) { return null; } // TODO: might not always be desired to leave min pixel value at 0 var minPixelValue = 0; var maxPixelValue = dtypeMaxValue[dtype]; // TODO check if this early return is expected if (!maxPixelValue) { return null; } if (!Number.isFinite(maxPixelValue) && typeof minRasterStatsValue === 'number' && typeof maxRasterStatsValue === 'number') { return [minRasterStatsValue, maxRasterStatsValue]; } return [minPixelValue, maxPixelValue]; } /** * Find min and max values throughout a raster band image * @param imageData raster band image data * @returns min and max values throughout the band */ function getImageMinMax(imageData) { // We cannot calculate min/max for Image/ImageBitmap if (!(0, _core.isArray)(imageData)) { return [null, null]; } var min = Infinity; var max = -Infinity; var _iterator = _createForOfIteratorHelper(imageData), _step; try { for (_iterator.s(); !(_step = _iterator.n()).done;) { var value = _step.value; if (!isNaN(value)) { min = Math.min(min, value); max = Math.max(max, value); } } } catch (err) { _iterator.e(err); } finally { _iterator.f(); } return [min, max]; } /** * Find asset names and band indexes for given commonNames * Right now in Kepler, our available methods of rendering raster data are quite simple. We only allow a user to choose among `presets`, and under the hood we select which data files to load. * @param usableAssets [stac description] * @param commonNames an array of eo:common_name to search within bands * @return Band information or null if not all bands exist */ function getBandIdsForCommonNames(stac, usableAssets, commonNames) { // An array of strings describing asset identifiers, e.g. the "key" in the assets object var assetIds = []; // An array of integers giving the index of the band within that asset's data // In general, data sources either have a single band per asset or all assets in a single band var bandIndexes = []; var _iterator2 = _createForOfIteratorHelper(commonNames), _step2; try { for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) { var commonName = _step2.value; // Find asset that includes a band with this common name var result = findAssetWithName(usableAssets, commonName, 'common_name'); if (result) { var _result = (0, _slicedToArray2["default"])(result, 2), assetName = _result[0], bandIndex = _result[1]; assetIds.push(assetName); bandIndexes.push(bandIndex); } } } catch (err) { _iterator2.e(err); } finally { _iterator2.f(); } if (assetIds.length === 0) { return null; } var _consolidateBandIndex = consolidateBandIndexes(stac, assetIds, bandIndexes), loadAssetIds = _consolidateBandIndex.loadAssetIds, loadBandIndexes = _consolidateBandIndex.loadBandIndexes, renderBandIndexes = _consolidateBandIndex.renderBandIndexes; return { loadAssetIds: loadAssetIds, loadBandIndexes: loadBandIndexes, renderBandIndexes: renderBandIndexes }; } /** * Consolidate asset/band info into load info and render info * @param stac STAC object * @param assetIds * @param bandIndexes * @return Asset information */ function consolidateBandIndexes(stac, assetIds, bandIndexes) { var loadAssetIds; var loadBandIndexes; var renderBandIndexes; // All bands we want to load are in a single asset if (assetIds.length === 1 || Array.from(new Set(assetIds)).length === 1) { var _asset$eoBands; loadAssetIds = [assetIds[0]]; var asset = getAssets(stac)[loadAssetIds[0]]; // Request all bands in order, then reorder with renderBandIndexes // NOTE: usually (e.g. with NAIP) if all bands are in a single asset, then there are only ~4 // bands. This approach of requesting all bands may be less efficient with more than 4 bands // (because of larger download sizes). In the future may want separate loading paths if we // encounter single asset objects with > 4 bands. // TODO: eo:bands can be _either_ on each asset _or_ on the STAC's properties, which is not currently handled loadBandIndexes = (_asset$eoBands = asset['eo:bands']) === null || _asset$eoBands === void 0 ? void 0 : _asset$eoBands.map(function (_, idx) { return idx; }); renderBandIndexes = bandIndexes; } else { loadAssetIds = assetIds; loadBandIndexes = bandIndexes; renderBandIndexes = null; } return { loadAssetIds: loadAssetIds, loadBandIndexes: loadBandIndexes, renderBandIndexes: renderBandIndexes }; } /** * Find the Asset in the STAC object that containing an eo:band with the desired common_name or name * @param assets assets object. Keys should be asset name and values should be asset data * @param name name or common_name in eo:bands * @param property 'name' or 'common_name' * @return name of asset containing desired band, index of band within asset */ function findAssetWithName(assets, name, property) { for (var _i = 0, _Object$entries = Object.entries(assets); _i < _Object$entries.length; _i++) { var _Object$entries$_i = (0, _slicedToArray2["default"])(_Object$entries[_i], 2), assetName = _Object$entries$_i[0], assetData = _Object$entries$_i[1]; var eoBands = assetData['eo:bands'] || []; // Search bands array of this asset for (var i = 0; i < eoBands.length; i++) { var eoBand = eoBands[i]; if (name === eoBand[property]) { return [assetName, i]; } } } return null; } function getSingleBandInfo(usableAssets, singleBandInfo) { var _singleBandInfo; if (!((_singleBandInfo = singleBandInfo) !== null && _singleBandInfo !== void 0 && _singleBandInfo.assetId) && Object.keys(usableAssets).length === 1) { singleBandInfo = { assetId: Object.keys(usableAssets)[0] }; } if (!singleBandInfo) { return null; } var _singleBandInfo2 = singleBandInfo, assetId = _singleBandInfo2.assetId, bandIndex = _singleBandInfo2.bandIndex; if (!Object.keys(usableAssets).includes(assetId)) { return null; } return { loadAssetIds: [assetId], loadBandIndexes: bandIndex ? [bandIndex] : [0], // No reordering of bands on the GPU renderBandIndexes: null }; } function getRasterStatisticsMinMax(stac, presetId, singleBandInfo) { if (presetId !== 'singleBand') { return [undefined, undefined]; } var minCategoricalBandValue; var maxCategoricalBandValue; var usableAssets = getUsableAssets(stac); var bandMetadata = usableAssets[(singleBandInfo === null || singleBandInfo === void 0 ? void 0 : singleBandInfo.assetId) || '']; if (!bandMetadata) { var assetId = Object.keys(usableAssets)[0]; bandMetadata = usableAssets[assetId]; } if (bandMetadata) { var _bandMetadata$raster, _bandMetadata$raster2; minCategoricalBandValue = (_bandMetadata$raster = bandMetadata['raster:bands']) === null || _bandMetadata$raster === void 0 || (_bandMetadata$raster = _bandMetadata$raster[0].statistics) === null || _bandMetadata$raster === void 0 ? void 0 : _bandMetadata$raster.minimum; maxCategoricalBandValue = (_bandMetadata$raster2 = bandMetadata['raster:bands']) === null || _bandMetadata$raster2 === void 0 || (_bandMetadata$raster2 = _bandMetadata$raster2[0].statistics) === null || _bandMetadata$raster2 === void 0 ? void 0 : _bandMetadata$raster2.maximum; } return [minCategoricalBandValue, maxCategoricalBandValue]; } function getSingleBandPresetOptions(stac, singleBandName) { var usableAssets = getUsableAssets(stac); var assetData = findAssetWithName(usableAssets, singleBandName, 'name'); if (!assetData) { // some collections have common_name instead of name assetData = findAssetWithName(usableAssets, singleBandName, 'common_name'); } var singleBand; if (assetData) { var _assetData = assetData, _assetData2 = (0, _slicedToArray2["default"])(_assetData, 2), assetId = _assetData2[0], bandIndex = _assetData2[1]; singleBand = { assetId: assetId, bandIndex: bandIndex }; } return singleBand; } /** * Calculate viewport-related min and max raster values from loaded tiles * @param tiles - deck.gl tiles * @returns [minPixelValue, maxPixelValue] */ function getMinMaxFromTile2DHeaders(tiles) { var minValues = tiles.map(function (tile) { if (!tile || !tile.data) { return null; } var minPixelValue = tile.data.minPixelValue; return minPixelValue; }).filter(function (value) { return value; }); var maxValues = tiles.map(function (tile) { if (!tile || !tile.data) { return null; } var maxPixelValue = tile.data.maxPixelValue; return maxPixelValue; }).filter(function (value) { return value; }); // We can cast to number[] because we have filtered null values return [Math.min.apply(Math, (0, _toConsumableArray2["default"])(minValues)), Math.max.apply(Math, (0, _toConsumableArray2["default"])(maxValues))]; } /** * Get loading params * @param stac STAC Object * @param preset Preset for display * @return Parameters for loading data */ function getDataSourceParams(stac, presetId, presetOptions) { var usableAssets = getUsableAssets(stac); var _PRESET_OPTIONS$prese = _config.PRESET_OPTIONS[presetId], commonNames = _PRESET_OPTIONS$prese.commonNames, bandCombination = _PRESET_OPTIONS$prese.bandCombination; var _getZoomRange = getZoomRange(stac), _getZoomRange2 = (0, _slicedToArray2["default"])(_getZoomRange, 2), minZoom = _getZoomRange2[0], maxZoom = _getZoomRange2[1]; var bandInfo = null; if (bandCombination === 'single') { bandInfo = getSingleBandInfo(usableAssets, presetOptions === null || presetOptions === void 0 ? void 0 : presetOptions.singleBand); } else if (commonNames) { bandInfo = getBandIdsForCommonNames(stac, usableAssets, commonNames); } else { return null; } if (!bandInfo) return null; var dtype = getDataType(usableAssets, bandInfo.loadAssetIds); var _getRasterStatisticsM = getRasterStatisticsMinMax(stac, presetId, presetOptions === null || presetOptions === void 0 ? void 0 : presetOptions.singleBand), _getRasterStatisticsM2 = (0, _slicedToArray2["default"])(_getRasterStatisticsM, 2), minRasterStatsValue = _getRasterStatisticsM2[0], maxRasterStatsValue = _getRasterStatisticsM2[1]; var pixelRange = getPixelRange(stac, dtype, [minRasterStatsValue, maxRasterStatsValue]); if (!pixelRange || !dtype) { return null; } var _pixelRange = (0, _slicedToArray2["default"])(pixelRange, 2), minPixelValue = _pixelRange[0], maxPixelValue = _pixelRange[1]; var _bandInfo = bandInfo, loadAssetIds = _bandInfo.loadAssetIds, loadBandIndexes = _bandInfo.loadBandIndexes, renderBandIndexes = _bandInfo.renderBandIndexes; var globalBounds = getSTACBounds(stac); return { loadAssetIds: loadAssetIds, loadBandIndexes: loadBandIndexes, renderBandIndexes: renderBandIndexes, minZoom: minZoom, maxZoom: maxZoom, minPixelValue: minPixelValue, maxPixelValue: maxPixelValue, // use min and max statistics values for categorical re-scale minCategoricalBandValue: minRasterStatsValue, maxCategoricalBandValue: maxRasterStatsValue, globalBounds: globalBounds, dataType: dtype }; } /** * Get Bounding Box of STAC object * @param stac * @return bounding box */ function getSTACBounds(stac) { // Check if Item if (stac.type === 'Feature') { // bbox may be missing return stac.bbox || null; } // Then must be collection return stac.extent.spatial.bbox[0]; } /** * Get all eo:band objects from STAC object * @param stac STAC object * @return array of eo:band objects or null */ function getEOBands(stac) { var assets = getAssets(stac); if (!assets) { return null; } var eoBands = []; for (var _i2 = 0, _Object$values = Object.values(assets); _i2 < _Object$values.length; _i2++) { var data = _Object$values[_i2]; var assetBands = data['eo:bands']; if (Array.isArray(assetBands) && assetBands.length > 0) { eoBands.push.apply(eoBands, (0, _toConsumableArray2["default"])(assetBands)); } } return eoBands; } /** * Filter presets by those that can be used with the given stac item * Each preset has a commonNames key, which is a list of eo `common_name` values. Some STAC items * may not have assets that span all of these combinations of `common_name`, so this filters the * input array. * @param stac STAC object * @param presetData object with requirements for each preset * @return An array of preset option ids that can be used with the given STAC item */ function filterAvailablePresets(stac, presetData) { if (!stac) { return null; } var eoBands = getEOBands(stac); if (!eoBands) { return null; } var availablePresetIds = []; for (var _i3 = 0, _Object$values2 = Object.values(presetData); _i3 < _Object$values2.length; _i3++) { var preset = _Object$values2[_i3]; var commonNames = preset.commonNames, bandCombination = preset.bandCombination; // True if all required common names of preset exist in STAC object var allBandsExist = commonNames === null || commonNames === void 0 ? void 0 : commonNames.every(function (commonName) { return eoBands.some(function (eoBand) { return eoBand.common_name === commonName; }); }); if (allBandsExist || bandCombination === 'single') { availablePresetIds.push(preset.id); } } return availablePresetIds; } // TODO: would be better to have a generic here to relax the requirement that all input STACs have all extensions we list. function getAssets(stac) { // stac is an Item if (stac.type === 'Feature') { return stac.assets; } // stac is a Collection // A STAC Collection optionally contains (if it includes the Item Assets Extension) an item_assets // key that describes the assets included in every Item in the Collection. return stac.item_assets; } /** * Find usable assets in main assets object * The `assets` object can point to many different objects, including original XML or JSON metadata, * thumbnails, etc. These aren't usable as image data in Studio. * @param stac STAC object * @return asset mapping including only assets usable in Studio */ function getUsableAssets(stac) { var allAssets = getAssets(stac); var usableAssets = {}; for (var assetName in allAssets) { var assetData = allAssets[assetName]; // We don't require data assets to have the "data" role, but if the asset has a non-data role, // we exclude it if (Array.isArray(assetData.roles) && assetData.roles.some(function (role) { return ['thumbnail', 'overview', 'metadata', 'visual'].includes(role); }) && !assetData.roles.includes('data')) { continue; } // raster:bands array exists if (assetData['raster:bands']) { usableAssets[assetName] = assetData; } // TODO: Could also mark the asset as unusable if the asset has a non-GeoTIFF or COG Media Type } return usableAssets; } /** * Get the max number of requests the TileLayer should be able to send at once * With HTTP 1 under Chrome, you can make a max of 6 concurrent requests per domain, so this number * should be 6 * number of domains tiles are loaded from. * @param stac STAC object * @return Number of permissible concurrent requests */ function getMaxRequests(rasterTileServerUrls) { return (rasterTileServerUrls.length || 1) * 6; } /** * Determine if two axis-aligned boxes intersect * @param bbox1 axis-aligned box * @param bbox2 axis-aligned box * @return true if boxes intersect */ function bboxIntersects(bbox1, bbox2) { if (!Array.isArray(bbox1) || bbox1.length !== 4 || !Array.isArray(bbox2) || bbox2.length !== 4) { // Invalid input; can't make determination return true; } return !(bbox2[0] > bbox1[2] || bbox2[2] < bbox1[0] || bbox2[3] < bbox1[1] || bbox2[1] > bbox1[3]); } /** * Compute zRange of tiles in viewport. * Derived from https://github.com/visgl/deck.gl/blob/8d824a4b836fee3bfebe6fc962e0f03d8c1dbd0d/modules/geo-layers/src/terrain-layer/terrain-layer.js#L173-L196 * @param tiles Array of tiles in current viewport */ function computeZRange(tiles) { // Abort if no tiles visible if (!tiles) { return null; } // Since getTileData returns an object with either {terrain, images} in 3d mode or {images} in // 2D mode, we can grab that object using tile.content.terrain, then grab the bounding box from // the header. var ranges = tiles.map(function (tile) { var _tile$content; return tile === null || tile === void 0 || (_tile$content = tile.content) === null || _tile$content === void 0 || (_tile$content = _tile$content.terrain) === null || _tile$content === void 0 || (_tile$content = _tile$content.header) === null || _tile$content === void 0 ? void 0 : _tile$content.boundingBox; }).flatMap(function (bounds) { return bounds ? [[bounds[0][2], bounds[1][2]]] : []; }); if (ranges.length === 0) { return null; } var minZ = Math.min.apply(Math, (0, _toConsumableArray2["default"])(ranges.map(function (x) { return x[0]; }))); var maxZ = Math.max.apply(Math, (0, _toConsumableArray2["default"])(ranges.map(function (x) { return x[1]; }))); return [minZ, maxZ]; } /** * Create RGBA bitmap array for categorical color scale from categorical color map * @param categoricalOptions - color map configuration and min-max values of categorical band * @returns typed array with bitmap data */ function generateCategoricalBitmapArray(categoricalOptions) { var colorMap = categoricalOptions.colorMap, _categoricalOptions$m = categoricalOptions.minValue, minValue = _categoricalOptions$m === void 0 ? 0 : _categoricalOptions$m, _categoricalOptions$m2 = categoricalOptions.maxValue, maxValue = _categoricalOptions$m2 === void 0 ? CATEGORICAL_TEXTURE_WIDTH - 1 : _categoricalOptions$m2; if (!colorMap) { return null; } var colorScaleMaxValue = maxValue - minValue; var step = CATEGORICAL_TEXTURE_WIDTH / (colorScaleMaxValue + 1); var data = new Uint8Array(CATEGORICAL_TEXTURE_WIDTH * 4); var _iterator3 = _createForOfIteratorHelper(colorMap), _step3; try { for (_iterator3.s(); !(_step3 = _iterator3.n()).done;) { var _step3$value = (0, _slicedToArray2["default"])(_step3.value, 2), value = _step3$value[0], color = _step3$value[1]; if (typeof value !== 'number') { continue; } var rgb = (0, _utils.hexToRgb)(color); var minPixel = Math.floor(value * step); var maxPixel = Math.floor((value + 1) * step - 1); for (var i = minPixel; i <= maxPixel; i++) { data.set([].concat((0, _toConsumableArray2["default"])(rgb), [CATEGORICAL_TEXTURE_WIDTH - 1]), i * 4); } } } catch (err) { _iterator3.e(err); } finally { _iterator3.f(); } return data; } function timeRangeToStacTemporalInterval(stac, startDate, endDate) { var _stac$extent; // TODO support multiple temporal intervals var interval = (_stac$extent = stac.extent) === null || _stac$extent === void 0 || (_stac$extent = _stac$extent.temporal) === null || _stac$extent === void 0 || (_stac$extent = _stac$extent.interval) === null || _stac$extent === void 0 ? void 0 : _stac$extent[0]; if (!interval || !interval[0]) return { startDate: startDate, endDate: endDate }; var collectionStart = interval[0] ? new Date(interval[0]) : new Date(); var collectionEnd = interval[1] ? new Date(interval[1]) : new Date(); var layerStart = new Date(startDate); var layerEnd = new Date(endDate); var clippedStart = layerStart < collectionStart || layerStart > collectionEnd ? collectionStart : layerStart; var clippedEnd = layerEnd > collectionEnd ? collectionEnd : layerEnd; if (clippedStart > clippedEnd) { clippedEnd = new Date(clippedStart); clippedEnd.setDate(clippedEnd.getDate() + 1); } return { startDate: clippedStart.toISOString().split('T')[0], endDate: clippedEnd.toISOString().split('T')[0] }; } //# 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SPDX-License-Identifier: MIT\n// Copyright contributors to the kepler.gl project\n\n/**\n * Utility functions and constants for processing STAC metadata and other raster tile data\n */\n\nimport {TypedArray} from '@loaders.gl/loader-utils/src/types';\nimport {isArray} from '@math.gl/core';\n\nimport {StacTypes} from '@kepler.gl/types';\nimport {hexToRgb} from '@kepler.gl/utils';\n\nimport {PRESET_OPTIONS, ZOOM_RANGES} from './config';\nimport {\n  DataSourceParams,\n  PresetData,\n  CompleteSTACObject,\n  CompleteSTACAssetLinks,\n  AssetIds,\n  BandIndexes,\n  RenderBandIndexes,\n  Tile2DHeader,\n  AssetRequestInfo,\n  PresetOption,\n  BandCombination,\n  CategoricalColormapOptions\n} from './types';\n\ntype Item = StacTypes.STACItem;\ntype Collection = StacTypes.STACCollection;\ntype EOBand = StacTypes.Band;\ntype DataTypeOfTheBand = StacTypes.DataTypeOfTheBand;\n\nexport const CATEGORICAL_TEXTURE_WIDTH = 256;\n\nexport function isColormapAllowed(bandCombination: BandCombination): boolean {\n  return bandCombination !== BandCombination.Rgb;\n}\n\nexport function isRescalingAllowed(bandCombination: BandCombination): boolean {\n  return bandCombination === BandCombination.Rgb || bandCombination === BandCombination.Single;\n}\n\nexport function isFilterAllowed(bandCombination: BandCombination): boolean {\n  return bandCombination !== BandCombination.Rgb;\n}\n\n/**\n * Max value for data type\n *\n * Values of null might be calculated in runtime\n */\nexport const dtypeMaxValue: Record<DataTypeOfTheBand, number | null> = {\n  uint8: Math.pow(2, 8) - 1,\n  uint16: Math.pow(2, 16) - 1,\n  uint32: Math.pow(2, 32) - 1,\n  uint64: null,\n  int8: Math.pow(2, 7) - 1,\n  int16: Math.pow(2, 15) - 1,\n  int32: Math.pow(2, 31) - 1,\n  int64: null,\n  float16: null,\n  float32: null,\n  float64: null,\n  cint16: null,\n  cint32: null,\n  cfloat32: null,\n  cfloat64: null,\n  other: null\n};\n\n/**\n * Is this a STAC Collection that supports custom searching\n * TODO: currently this is a custom hack to support Sentinel. It will need to be generalized before being accessible\n * @param stac  STAC object\n * @return If True, supports searching\n */\nexport function isSearchableStac(stac: CompleteSTACObject): boolean {\n  return stac.type === 'Collection';\n\n  // return stac.type !== 'Feature' && stac?.providers.some(\n  //   provider =>\n  //     provider.name.toLowerCase() === 'microsoft' &&\n  //     provider.url === 'https://planetarycomputer.microsoft.com'\n  // );\n}\n\nfunction getZoomRange(stac: CompleteSTACObject): [number, number] {\n  if (ZOOM_RANGES[stac.id]) {\n    return ZOOM_RANGES[stac.id];\n  }\n\n  // For a single COG, having a full zoom range isn't really a problem.\n  // the /cog/info endpoint doesn't describe zoom levels because it doesn't know the projection to serve the image in.\n  // Default minzoom, maxzoom: [0, 20]\n  return [0, 20];\n}\n\n/**\n * Infer data type from STAC item\n * This uses the `raster` extension, which is not yet very common\n * @param stac stac object\n * @return Data type of the band\n */\nfunction getDataType(\n  usableAssets: CompleteSTACAssetLinks,\n  typesToCheck?: string[]\n): DataTypeOfTheBand | null {\n  const dataTypes = new Set<DataTypeOfTheBand>();\n  for (const assetName in usableAssets) {\n    const asset = usableAssets[assetName];\n    if (!asset) {\n      continue;\n    }\n    if (typesToCheck && !typesToCheck.includes(assetName)) {\n      continue;\n    }\n\n    asset['raster:bands']?.forEach(band => band.data_type && dataTypes.add(band.data_type));\n  }\n\n  // TODO: support multiple data types across assets\n  if (dataTypes.size !== 1) {\n    return null;\n  }\n\n  return Array.from(dataTypes)[0];\n}\n\n/**\n * Get min and max values of the band from the band's data type values range\n * @param stac - stac metadata object\n * @param dtype - data type of the raster band\n * @returns min and max values for the band\n */\nfunction getPixelRange(\n  stac: CompleteSTACObject,\n  dtype: DataTypeOfTheBand | null,\n  [minRasterStatsValue, maxRasterStatsValue]: [number | undefined, number | undefined]\n): [number, number] | null {\n  if (!dtype) {\n    return null;\n  }\n\n  // TODO: might not always be desired to leave min pixel value at 0\n  const minPixelValue = 0;\n  const maxPixelValue = dtypeMaxValue[dtype];\n\n  // TODO check if this early return is expected\n  if (!maxPixelValue) {\n    return null;\n  }\n\n  if (\n    !Number.isFinite(maxPixelValue) &&\n    typeof minRasterStatsValue === 'number' &&\n    typeof maxRasterStatsValue === 'number'\n  ) {\n    return [minRasterStatsValue, maxRasterStatsValue];\n  }\n\n  return [minPixelValue, maxPixelValue];\n}\n\n/**\n * Find min and max values throughout a raster band image\n * @param imageData raster band image data\n * @returns min and max values throughout the band\n */\nexport function getImageMinMax(imageData: TypedArray): [number | null, number | null] {\n  // We cannot calculate min/max for Image/ImageBitmap\n  if (!isArray(imageData)) {\n    return [null, null];\n  }\n  let min = Infinity;\n  let max = -Infinity;\n  for (const value of imageData) {\n    if (!isNaN(value)) {\n      min = Math.min(min, value);\n      max = Math.max(max, value);\n    }\n  }\n  return [min, max];\n}\n\n/**\n * Find asset names and band indexes for given commonNames\n * Right now in Kepler, our available methods of rendering raster data are quite simple. We only allow a user to choose among `presets`, and under the hood we select which data files to load.\n * @param usableAssets [stac description]\n * @param commonNames  an array of eo:common_name to search within bands\n * @return Band information or null if not all bands exist\n */\nexport function getBandIdsForCommonNames(\n  stac: CompleteSTACObject,\n  usableAssets: CompleteSTACAssetLinks,\n  commonNames: string[]\n): AssetRequestInfo | null {\n  // An array of strings describing asset identifiers, e.g. the \"key\" in the assets object\n  const assetIds: AssetIds = [];\n  // An array of integers giving the index of the band within that asset's data\n  // In general, data sources either have a single band per asset or all assets in a single band\n  const bandIndexes: BandIndexes = [];\n\n  for (const commonName of commonNames) {\n    // Find asset that includes a band with this common name\n    const result = findAssetWithName(usableAssets, commonName, 'common_name');\n    if (result) {\n      const [assetName, bandIndex] = result;\n      assetIds.push(assetName);\n      bandIndexes.push(bandIndex);\n    }\n  }\n\n  if (assetIds.length === 0) {\n    return null;\n  }\n\n  const {loadAssetIds, loadBandIndexes, renderBandIndexes} = consolidateBandIndexes(\n    stac,\n    assetIds,\n    bandIndexes\n  );\n\n  return {loadAssetIds, loadBandIndexes, renderBandIndexes};\n}\n\n/**\n * Consolidate asset/band info into load info and render info\n * @param stac STAC object\n * @param assetIds\n * @param bandIndexes\n * @return Asset information\n */\nfunction consolidateBandIndexes(\n  stac: CompleteSTACObject,\n  assetIds: AssetIds,\n  bandIndexes: BandIndexes\n): AssetRequestInfo {\n  let loadAssetIds: AssetIds;\n  let loadBandIndexes: BandIndexes;\n  let renderBandIndexes: RenderBandIndexes;\n\n  // All bands we want to load are in a single asset\n  if (assetIds.length === 1 || Array.from(new Set(assetIds)).length === 1) {\n    loadAssetIds = [assetIds[0]];\n\n    const asset = getAssets(stac)[loadAssetIds[0]];\n\n    // Request all bands in order, then reorder with renderBandIndexes\n    // NOTE: usually (e.g. with NAIP) if all bands are in a single asset, then there are only ~4\n    // bands. This approach of requesting all bands may be less efficient with more than 4 bands\n    // (because of larger download sizes). In the future may want separate loading paths if we\n    // encounter single asset objects with > 4 bands.\n\n    // TODO: eo:bands can be _either_ on each asset _or_ on the STAC's properties, which is not currently handled\n    loadBandIndexes = (asset['eo:bands'] as EOBand[])?.map((_, idx) => idx);\n    renderBandIndexes = bandIndexes;\n  } else {\n    loadAssetIds = assetIds;\n    loadBandIndexes = bandIndexes;\n    renderBandIndexes = null;\n  }\n\n  return {loadAssetIds, loadBandIndexes, renderBandIndexes};\n}\n\n/**\n * Find the Asset in the STAC object that containing an eo:band with the desired common_name or name\n * @param assets assets object. Keys should be asset name and values should be asset data\n * @param name  name or common_name in eo:bands\n * @param property 'name' or 'common_name'\n * @return name of asset containing desired band, index of band within asset\n */\nexport function findAssetWithName(\n  assets: CompleteSTACAssetLinks,\n  name: string,\n  property: 'name' | 'common_name'\n): [string, number] | null {\n  for (const [assetName, assetData] of Object.entries(assets)) {\n    const eoBands = assetData['eo:bands'] || [];\n\n    // Search bands array of this asset\n    for (let i = 0; i < eoBands.length; i++) {\n      const eoBand = eoBands[i];\n      if (name === eoBand[property]) {\n        return [assetName, i];\n      }\n    }\n  }\n\n  return null;\n}\n\nfunction getSingleBandInfo(\n  usableAssets: CompleteSTACAssetLinks,\n  singleBandInfo: PresetOption['singleBand']\n): AssetRequestInfo | null {\n  if (!singleBandInfo?.assetId && Object.keys(usableAssets).length === 1) {\n    singleBandInfo = {\n      assetId: Object.keys(usableAssets)[0]\n    };\n  }\n\n  if (!singleBandInfo) {\n    return null;\n  }\n\n  const {assetId, bandIndex} = singleBandInfo;\n  if (!Object.keys(usableAssets).includes(assetId)) {\n    return null;\n  }\n\n  return {\n    loadAssetIds: [assetId],\n    loadBandIndexes: bandIndex ? [bandIndex] : [0],\n    // No reordering of bands on the GPU\n    renderBandIndexes: null\n  };\n}\n\nexport function getRasterStatisticsMinMax(\n  stac: CompleteSTACObject,\n  presetId: string,\n  singleBandInfo: PresetOption['singleBand']\n): [number | undefined, number | undefined] {\n  if (presetId !== 'singleBand') {\n    return [undefined, undefined];\n  }\n  let minCategoricalBandValue: number | undefined;\n  let maxCategoricalBandValue: number | undefined;\n  const usableAssets = getUsableAssets(stac);\n  let bandMetadata = usableAssets[singleBandInfo?.assetId || ''];\n  if (!bandMetadata) {\n    const assetId = Object.keys(usableAssets)[0];\n    bandMetadata = usableAssets[assetId];\n  }\n\n  if (bandMetadata) {\n    minCategoricalBandValue = bandMetadata['raster:bands']?.[0].statistics?.minimum;\n    maxCategoricalBandValue = bandMetadata['raster:bands']?.[0].statistics?.maximum;\n  }\n\n  return [minCategoricalBandValue, maxCategoricalBandValue];\n}\n\nexport function getSingleBandPresetOptions(\n  stac: CompleteSTACObject,\n  singleBandName: string\n): PresetOption['singleBand'] {\n  const usableAssets = getUsableAssets(stac);\n  let assetData = findAssetWithName(usableAssets, singleBandName, 'name');\n  if (!assetData) {\n    // some collections have common_name instead of name\n    assetData = findAssetWithName(usableAssets, singleBandName, 'common_name');\n  }\n  let singleBand: PresetOption['singleBand'];\n  if (assetData) {\n    const [assetId, bandIndex] = assetData;\n    singleBand = {assetId, bandIndex};\n  }\n  return singleBand;\n}\n\n/**\n * Calculate viewport-related min and max raster values from loaded tiles\n * @param tiles - deck.gl tiles\n * @returns [minPixelValue, maxPixelValue]\n */\nexport function getMinMaxFromTile2DHeaders(tiles: (Tile2DHeader | null)[]): [number, number] {\n  const minValues: (number | null)[] = tiles\n    .map((tile: Tile2DHeader | null) => {\n      if (!tile || !tile.data) {\n        return null;\n      }\n      const {minPixelValue} = tile.data;\n      return minPixelValue;\n    })\n    .filter(value => value);\n  const maxValues: (number | null)[] = tiles\n    .map((tile: Tile2DHeader | null) => {\n      if (!tile || !tile.data) {\n        return null;\n      }\n      const {maxPixelValue} = tile.data;\n      return maxPixelValue;\n    })\n    .filter(value => value);\n  // We can cast to number[] because we have filtered null values\n  return [Math.min(...(minValues as number[])), Math.max(...(maxValues as number[]))];\n}\n\n/**\n * Get loading params\n * @param stac STAC Object\n * @param preset Preset for display\n * @return Parameters for loading data\n */\nexport function getDataSourceParams(\n  stac: CompleteSTACObject,\n  presetId: string,\n  presetOptions?: PresetOption\n): DataSourceParams | null {\n  const usableAssets = getUsableAssets(stac);\n  const {commonNames, bandCombination} = PRESET_OPTIONS[presetId];\n  const [minZoom, maxZoom] = getZoomRange(stac);\n\n  let bandInfo: AssetRequestInfo | null = null;\n  if (bandCombination === 'single') {\n    bandInfo = getSingleBandInfo(usableAssets, presetOptions?.singleBand);\n  } else if (commonNames) {\n    bandInfo = getBandIdsForCommonNames(stac, usableAssets, commonNames);\n  } else {\n    return null;\n  }\n\n  if (!bandInfo) return null;\n\n  const dtype = getDataType(usableAssets, bandInfo.loadAssetIds);\n  const [minRasterStatsValue, maxRasterStatsValue] = getRasterStatisticsMinMax(\n    stac,\n    presetId,\n    presetOptions?.singleBand\n  );\n  const pixelRange = getPixelRange(stac, dtype, [minRasterStatsValue, maxRasterStatsValue]);\n\n  if (!pixelRange || !dtype) {\n    return null;\n  }\n\n  const [minPixelValue, maxPixelValue] = pixelRange;\n  const {loadAssetIds, loadBandIndexes, renderBandIndexes} = bandInfo;\n  const globalBounds = getSTACBounds(stac);\n\n  return {\n    loadAssetIds,\n    loadBandIndexes,\n    renderBandIndexes,\n    minZoom,\n    maxZoom,\n    minPixelValue,\n    maxPixelValue,\n    // use min and max statistics values for categorical re-scale\n    minCategoricalBandValue: minRasterStatsValue,\n    maxCategoricalBandValue: maxRasterStatsValue,\n    globalBounds,\n    dataType: dtype\n  };\n}\n\n/**\n * Get Bounding Box of STAC object\n * @param stac\n * @return bounding box\n */\nexport function getSTACBounds(stac: Item | Collection): number[] | null {\n  // Check if Item\n  if (stac.type === 'Feature') {\n    // bbox may be