kepler.gl
Version:
kepler.gl is a webgl based application to visualize large scale location data in the browser
26 lines (24 loc) • 2.99 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.enhancedVegetationIndex = void 0;
// SPDX-License-Identifier: MIT
// Copyright contributors to the kepler.gl project
// Calculate enhanced vegetation index
// Expected to be ordered:
// red: Landsat 8 band 5
// green: Landsat 8 band 4
// blue: Landsat 8 band 2
//
// EVI = 2.5 * ((Band 5 – Band 4) / (Band 5 + 6 * Band 4 – 7.5 * Band 2 + 1))
// https://www.usgs.gov/land-resources/nli/landsat/landsat-enhanced-vegetation-index
var fs = "float enhanced_vegetation_index_calc(vec4 image) {\n float band5 = image.r;\n float band4 = image.g;\n float band2 = image.b;\n\n float numerator = band5 - band4;\n float denominator = band5 + (6. * band4) - (7.5 * band2) + 1.;\n return 2.5 * (numerator / denominator);\n}\n";
var enhancedVegetationIndex = exports.enhancedVegetationIndex = {
name: 'enhanced_vegetation_index',
fs: fs,
inject: {
'fs:DECKGL_MUTATE_COLOR': "\n image = vec4(enhanced_vegetation_index_calc(image), 0., 0., 0.);\n "
}
};
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