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//VERSION=3 | ||
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//Basic initialization setup function | ||
function setup() { | ||
return { | ||
//List of all bands, that will be used in the script, either for visualization or for choosing best pixel | ||
input: [{ | ||
bands: [ | ||
"Red", | ||
"NIR", | ||
] | ||
}], | ||
//This can always be the same if one is doing RGB images | ||
output: [ | ||
{ id: "default", bands: 4 }, | ||
{ id: "index", bands: 1, sampleType: "FLOAT32" }, | ||
{ id: "eobrowserStats", bands: 2, sampleType: "FLOAT32" }, | ||
{ id: "dataMask", bands: 1 } | ||
], | ||
mosaicking: "ORBIT" | ||
} | ||
} | ||
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/* | ||
In this function we limit the scenes, which are used for processing. | ||
These are based also on input variables. | ||
E.g. if one sets date "2017-03-01" ("TO date") and cloud coverage filter 30%, | ||
all scenes older than 2017-03-01 with cloud coverage 30% will be checked against | ||
further conditions in this function (in this function it is currently limited to 3 months). | ||
The more scenes there are, longer it will take to process the data. | ||
After 60 seconds of processing, there will be a timeout. | ||
*/ | ||
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function preProcessScenes(collections) { | ||
collections.scenes.orbits = collections.scenes.orbits.filter(function (orbit) { | ||
var orbitDateFrom = new Date(orbit.dateFrom) | ||
return orbitDateFrom.getTime() >= (collections.to.getTime() - 3 * 31 * 24 * 3600 * 1000); | ||
}) | ||
return collections | ||
} | ||
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||
function calcNDVI(sample) { | ||
var denom = sample.Red + sample.NIR; | ||
return ((denom != 0) ? (sample.NIR - sample.Red) / denom : NaN); | ||
} | ||
function evaluatePixel(samples) { | ||
var max = Number.NEGATIVE_INFINITY; | ||
for (let i = 0; i < samples.length; i++) { | ||
var ndvi = calcNDVI(samples[i]); | ||
max = ndvi > max ? ndvi : max; | ||
} | ||
let max_exists = 0; | ||
if (isFinite(max)) { | ||
max_exists = 1; | ||
} | ||
let imgVals; | ||
if (max < -1.1) { imgVals = [0, 0, 0]; } | ||
else if (max < - 0.2) { imgVals = [0.75, 0.75, 0.75]; } | ||
else if (max < - 0.1) { imgVals = [0.86, 0.86, 0.86]; } | ||
else if (max < 0) { imgVals = [1, 1, 0.88]; } | ||
else if (max < 0.025) { imgVals = [1, 0.98, 0.8]; } | ||
else if (max < 0.05) { imgVals = [0.93, 0.91, 0.71]; } | ||
else if (max < 0.075) { imgVals = [0.87, 0.85, 0.61]; } | ||
else if (max < 0.1) { imgVals = [0.8, 0.78, 0.51]; } | ||
else if (max < 0.125) { imgVals = [0.74, 0.72, 0.42]; } | ||
else if (max < 0.15) { imgVals = [0.69, 0.76, 0.38]; } | ||
else if (max < 0.175) { imgVals = [0.64, 0.8, 0.35]; } | ||
else if (max < 0.2) { imgVals = [0.57, 0.75, 0.32]; } | ||
else if (max < 0.25) { imgVals = [0.5, 0.7, 0.28]; } | ||
else if (max < 0.3) { imgVals = [0.44, 0.64, 0.25]; } | ||
else if (max < 0.35) { imgVals = [0.38, 0.59, 0.21]; } | ||
else if (max < 0.4) { imgVals = [0.31, 0.54, 0.18]; } | ||
else if (max < 0.45) { imgVals = [0.25, 0.49, 0.14]; } | ||
else if (max < 0.5) { imgVals = [0.19, 0.43, 0.11]; } | ||
else if (max < 0.55) { imgVals = [0.13, 0.38, 0.07]; } | ||
else if (max < 0.6) { imgVals = [0.06, 0.33, 0.04]; } | ||
else { imgVals = [0, 0.27, 0]; } | ||
return { | ||
default: imgVals.concat(max_exists), | ||
index: [max], | ||
eobrowserStats: [max, max_exists], | ||
dataMask: [max_exists] | ||
} | ||
} |
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