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Get 10 days period, max NDSI from MODIS/Terra 500m resolution daily product(MOD09GA)?

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1

I want to make a NDSI with a ten days period from daily MOD09GA with Google Earth Engine.
The code is a adaptation from this code Maximum ndvi for 3 months average in Google Earth Engine and with this i want to thank Nicholas Clinton for his efforts to help the community.

When I use the code(the comment in the code) for renaming images after their dates, all goes well but when i try to download it, gives me error. The error is Error: Expected a homogeneous image collection, but an image with incompatible bands was encountered: First image type: 1 bands ([2001_01_21]). Current image type: 1 bands ([2001_01_22]). Image ID: 2001_01_22 Some bands might require explicit casts.

My doubts are how can I rename those NDSI's with the date name so I can export it right ??

var pol3=ee.FeatureCollection('users/georgeboldeanu20/front_WGS');

var batch = require('users/fitoprincipe/geetools:batch')



var NDSI = ee.ImageCollection('MODIS/006/MOD09GA').map(function(image) {

  return image.select().addBands(image.normalizedDifference(['sur_refl_b04','sur_refl_b07'])).rename('NDSI').clip(pol3);

});

//This is the rename code 

////var NDSI_name = NDSI.map( function(img){ 

/// var id  = img.id()

 ///img = img.select('NDSI').rename(id);

///return img.copyProperties(img,['system:time_start','system:time_end']); });

//print(NDSI_name);



var COLlection = function(collection, start, count, interval, units) {

  var sequence = ee.List.sequence(0, ee.Number(count).subtract(1));



var originalStartDate = ee.Date(start);



  return ee.ImageCollection(sequence.map(function(i) {

    var startDate = originalStartDate.advance(ee.Number(interval).multiply(i), units);



    var endDate = originalStartDate.advance(

      ee.Number(interval).multiply(ee.Number(i).add(1)), units);



    return collection.filterDate(startDate, endDate)

        .reduce(ee.Reducer.max());

  }));

};



var days= COLlection(NDSI_name, ee.Date('2001-01-01'),10, 10, 'day');



var test = ee.Image(days.first());

print(test)

print(days)



batch.Download.ImageCollection.toDrive(luni, "Folder", {region:pol3.geometry().bounds(),crs:'EPSG:4326', scale:300});

google-earth-engine

share|improve this question

edited 2 mins ago

George Boldeanu

asked 1 hour ago

George BoldeanuGeorge Boldeanu

63

add a comment | 

1

I want to make a NDSI with a ten days period from daily MOD09GA with Google Earth Engine.
The code is a adaptation from this code Maximum ndvi for 3 months average in Google Earth Engine and with this i want to thank Nicholas Clinton for his efforts to help the community.

When I use the code(the comment in the code) for renaming images after their dates, all goes well but when i try to download it, gives me error. The error is Error: Expected a homogeneous image collection, but an image with incompatible bands was encountered: First image type: 1 bands ([2001_01_21]). Current image type: 1 bands ([2001_01_22]). Image ID: 2001_01_22 Some bands might require explicit casts.

My doubts are how can I rename those NDSI's with the date name so I can export it right ??

var pol3=ee.FeatureCollection('users/georgeboldeanu20/front_WGS');

var batch = require('users/fitoprincipe/geetools:batch')



var NDSI = ee.ImageCollection('MODIS/006/MOD09GA').map(function(image) {

  return image.select().addBands(image.normalizedDifference(['sur_refl_b04','sur_refl_b07'])).rename('NDSI').clip(pol3);

});

//This is the rename code 

////var NDSI_name = NDSI.map( function(img){ 

/// var id  = img.id()

 ///img = img.select('NDSI').rename(id);

///return img.copyProperties(img,['system:time_start','system:time_end']); });

//print(NDSI_name);



var COLlection = function(collection, start, count, interval, units) {

  var sequence = ee.List.sequence(0, ee.Number(count).subtract(1));



var originalStartDate = ee.Date(start);



  return ee.ImageCollection(sequence.map(function(i) {

    var startDate = originalStartDate.advance(ee.Number(interval).multiply(i), units);



    var endDate = originalStartDate.advance(

      ee.Number(interval).multiply(ee.Number(i).add(1)), units);



    return collection.filterDate(startDate, endDate)

        .reduce(ee.Reducer.max());

  }));

};



var days= COLlection(NDSI_name, ee.Date('2001-01-01'),10, 10, 'day');



var test = ee.Image(days.first());

print(test)

print(days)



batch.Download.ImageCollection.toDrive(luni, "Folder", {region:pol3.geometry().bounds(),crs:'EPSG:4326', scale:300});

google-earth-engine

share|improve this question

edited 2 mins ago

George Boldeanu

asked 1 hour ago

George BoldeanuGeorge Boldeanu

63

add a comment | 

I want to make a NDSI with a ten days period from daily MOD09GA with Google Earth Engine.
The code is a adaptation from this code Maximum ndvi for 3 months average in Google Earth Engine and with this i want to thank Nicholas Clinton for his efforts to help the community.

When I use the code(the comment in the code) for renaming images after their dates, all goes well but when i try to download it, gives me error. The error is Error: Expected a homogeneous image collection, but an image with incompatible bands was encountered: First image type: 1 bands ([2001_01_21]). Current image type: 1 bands ([2001_01_22]). Image ID: 2001_01_22 Some bands might require explicit casts.

My doubts are how can I rename those NDSI's with the date name so I can export it right ??

var pol3=ee.FeatureCollection('users/georgeboldeanu20/front_WGS');

var batch = require('users/fitoprincipe/geetools:batch')



var NDSI = ee.ImageCollection('MODIS/006/MOD09GA').map(function(image) {

  return image.select().addBands(image.normalizedDifference(['sur_refl_b04','sur_refl_b07'])).rename('NDSI').clip(pol3);

});

//This is the rename code 

////var NDSI_name = NDSI.map( function(img){ 

/// var id  = img.id()

 ///img = img.select('NDSI').rename(id);

///return img.copyProperties(img,['system:time_start','system:time_end']); });

//print(NDSI_name);



var COLlection = function(collection, start, count, interval, units) {

  var sequence = ee.List.sequence(0, ee.Number(count).subtract(1));



var originalStartDate = ee.Date(start);



  return ee.ImageCollection(sequence.map(function(i) {

    var startDate = originalStartDate.advance(ee.Number(interval).multiply(i), units);



    var endDate = originalStartDate.advance(

      ee.Number(interval).multiply(ee.Number(i).add(1)), units);



    return collection.filterDate(startDate, endDate)

        .reduce(ee.Reducer.max());

  }));

};



var days= COLlection(NDSI_name, ee.Date('2001-01-01'),10, 10, 'day');



var test = ee.Image(days.first());

print(test)

print(days)



batch.Download.ImageCollection.toDrive(luni, "Folder", {region:pol3.geometry().bounds(),crs:'EPSG:4326', scale:300});

google-earth-engine

share|improve this question

edited 2 mins ago

George Boldeanu

asked 1 hour ago

George BoldeanuGeorge Boldeanu

63

var pol3=ee.FeatureCollection('users/georgeboldeanu20/front_WGS');

var batch = require('users/fitoprincipe/geetools:batch')



var NDSI = ee.ImageCollection('MODIS/006/MOD09GA').map(function(image) {

  return image.select().addBands(image.normalizedDifference(['sur_refl_b04','sur_refl_b07'])).rename('NDSI').clip(pol3);

});

//This is the rename code 

////var NDSI_name = NDSI.map( function(img){ 

/// var id  = img.id()

 ///img = img.select('NDSI').rename(id);

///return img.copyProperties(img,['system:time_start','system:time_end']); });

//print(NDSI_name);



var COLlection = function(collection, start, count, interval, units) {

  var sequence = ee.List.sequence(0, ee.Number(count).subtract(1));



var originalStartDate = ee.Date(start);



  return ee.ImageCollection(sequence.map(function(i) {

    var startDate = originalStartDate.advance(ee.Number(interval).multiply(i), units);



    var endDate = originalStartDate.advance(

      ee.Number(interval).multiply(ee.Number(i).add(1)), units);



    return collection.filterDate(startDate, endDate)

        .reduce(ee.Reducer.max());

  }));

};



var days= COLlection(NDSI_name, ee.Date('2001-01-01'),10, 10, 'day');



var test = ee.Image(days.first());

print(test)

print(days)



batch.Download.ImageCollection.toDrive(luni, "Folder", {region:pol3.geometry().bounds(),crs:'EPSG:4326', scale:300});

share|improve this question

edited 2 mins ago

George Boldeanu

asked 1 hour ago

George BoldeanuGeorge Boldeanu

63

share|improve this question

edited 2 mins ago

George Boldeanu

asked 1 hour ago

George BoldeanuGeorge Boldeanu

63

asked 1 hour ago

George BoldeanuGeorge Boldeanu

63

asked 1 hour ago

George BoldeanuGeorge Boldeanu

63