How to convert Kelvin to Celsius in MODIS LST product in google earth engine?

Question

I'm trying to convert Kelvin to Celsius in MODIS LST product in Google Earth Engine. But there is an error in my code. The code is:

 var LST_K = ee.ImageCollection('MODIS/006/MOD11A2')
.filterBounds(AOI)
.filterDate('2021-02-20','2021-05-31')
.select("LST_Day_1km","LST_Night_1km")
.map(function(img){
  return img.multiply(0.02)
  .copyProperties(img,['system:time_start','system:time_end']);
});

print(LST_K);

// convert LST to celcius
var toCelsius = function(img){
var time = img.get('system:time_start')
var celsius = img.multiply(0.02) // scale factor
.subtract(273.15) // from kelvin to C
.rename('Celcius')
.set('system:time_start',time)
return celsius;
};
 
var LST = LST_K.map(toCelsius)
print(LST);

print(ui.Chart.image.series(LST, AOI, ee.Reducer.median(), 1000, 'system:time_start'));

and the link code is below: https://code.earthengine.google.com/61b7668525bd38cd543f72c0ad201886

Many thanks in advance

score 0 · Answer 1 · answered Jun 01 '21 at 14:09

The error you're getting is about renaming the bands of the imageCollection "LST_K". This imageCollection has 2 bands, the LST_daytime band and the LST_nighttime band, so in your rename statement you should add two names instead of one.

Adding both names will solve this issue:

.rename(['LST_Day_1km_Celcius', 'LST_Night_1km_Celcius'])

How to convert Kelvin to Celsius in MODIS LST product in google earth engine?

1 Answers1