Hello
I want to estimate LST by Landsat 8 collection 2 level 2.
What is its steps and formula.
with regards
Hello Mr.Taher Mostafapour
This is Durga Prasad Jakka from India
This is the code for lst calculation for landsat images using Google Earth engine
Just remove visualisation parameters from Map.addLayer() function which produce error for you and you add your own visualisation parameters
//Importing Landsat Images
var Images = ee.ImageCollection("LANDSAT/LT05/C02/T1_L2")
.filterBounds(ROI)
.filterDate('1995-01-01','1995-12-31')
.filterMetadata('CLOUD_COVER', 'less_than', 5)
.mean();
Map.addLayer(Images.clip(ROI),imageVisParam,'Landsat5');
print(Images);
//median (ndvi)
{
var ndvi = Images.normalizedDifference(['SR_B4', 'SR_B3']).rename('NDVI');
var ndvi_clip = ndvi.clip(ROI)
var ndviParams = {min: -1, max: 1, palette: ['blue', 'white', 'green']};
print(ndvi,'ndvi');
Map.addLayer(ndvi_clip, ndviParams, 'ndvi');
}
//select thermal band 10(with brightness tempereature), no calculation
var thermal= Images.select('ST_B6').multiply(0.00341802).add(149.0);
var thermal_clip = thermal.clip(ROI)
var b10Params = {min: 291.918, max: 302.382, palette: ['blue', 'white', 'green']};
Map.addLayer(thermal_clip, b10Params , 'thermal');
// find the min and max of NDVI
var min = ee.Number(ndvi_clip.reduceRegion({
reducer: ee.Reducer.min(),
geometry: ROI,
scale: 30,
maxPixels: 1e9
}).values().get(0));
print(min, 'min');
var max = ee.Number(ndvi_clip.reduceRegion({
reducer: ee.Reducer.max(),
print(max, 'max')
//fractional vegetation
var fv =(ndvi_clip.subtract(min).divide(max.subtract(min))).pow(ee.Number(2)).rename('FV');
print(fv, 'fv');
Map.addLayer(fv);
//Emissivity
var a= ee.Number(0.004);
var b= ee.Number(0.986);
var EM=fv.multiply(a).add(b).rename('EMM');
var imageVisParam3 = {min: 0.9865619146722164, max:0.989699971371314};
Map.addLayer(EM, imageVisParam3,'EMM');
//LST in Celsius Degree bring -273.15
//NB: In Kelvin don't bring -273.15
var LST = thermal.expression(
'(Tb/(1 + (0.00115* (Tb / 1.438))*log(Ep)))-273.15', {
'Tb': thermal.select('ST_B6'),
'Ep': EM.select('EMM')
}).rename('LST');
//min max LST
var min = ee.Number(LST.reduceRegion({
print(min, 'minLST');
var max = ee.Number(LST.reduceRegion({
print(max, 'maxLST')
Map.addLayer(LST, {min: 12.19726940544291, max:41.6701111498399, palette: [
'040274', '040281', '0502a3', '0502b8', '0502ce', '0502e6',
'0602ff', '235cb1', '307ef3', '269db1', '30c8e2', '32d3ef',
'3be285', '3ff38f', '86e26f', '3ae237', 'b5e22e', 'd6e21f',
'fff705', 'ffd611', 'ffb613', 'ff8b13', 'ff6e08', 'ff500d',
'ff0000', 'de0101', 'c21301', 'a71001', '911003'
]},'LST');
Export.image.toDrive({
image: LST,
description: 'LST',
folder: "image EE",
region: ROI,
fileFormat: 'GeoTIFF',
formatOptions: {
cloudOptimized: true
});
Which software you want to use? Please be more specific in your question.
Arc Gs pro or Envi or Matlab.
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