kepler.gl
Version:
kepler.gl is a webgl based application to visualize large scale location data in the browser
25 lines (23 loc) • 3.09 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.modifiedSoilAdjustedVegetationIndex = void 0;
// SPDX-License-Identifier: MIT
// Copyright contributors to the kepler.gl project
// Calculate modified soil-adjusted vegetation index
// Expected to be ordered:
// red: Landsat 8 band 5
// green: Landsat 8 band 4
//
// MSAVI = (2 * Band 5 + 1 – sqrt ((2 * Band 5 + 1)^2 – 8 * (Band 5 – Band 4))) / 2
// https://www.usgs.gov/land-resources/nli/landsat/landsat-modified-soil-adjusted-vegetation-index
var fs = "float modified_soil_adjusted_vegetation_index_calc(vec4 image) {\n float band5 = image.r;\n float band4 = image.g;\n\n float to_sqrt = ((2. * band5 + 1.) * (2. * band5 + 1.)) - (8. * (band5 - band4));\n return ((2. * band5) + 1. - sqrt(to_sqrt)) / 2.;\n}\n";
var modifiedSoilAdjustedVegetationIndex = exports.modifiedSoilAdjustedVegetationIndex = {
name: 'modified_soil_adjusted_vegetation_index',
fs: fs,
inject: {
'fs:DECKGL_MUTATE_COLOR': "\n image = vec4(modified_soil_adjusted_vegetation_index_calc(image), 0., 0., 0.);\n "
}
};
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