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Seeking Function to calculate red-edgeNDVI in Google Earth Engine?
Calculating CIredEdge from Sentinel 2 composite image and adding as Band in Google Earth Explorer?How to calculate forest loss in google earth engineGEE cloud-free Sentinel2 and linear RegressionLinearFit with Google Earth EngineCalculate MSAVI (Modified Soil-adjusted Vegetation Index) in Google Earth EngineGoogle Earth Engine - Map.addLayerGoogle Earth Engine, how to distinguish between rivers/streams and ponds/lakes in a water maskMissing band in mapping function using Google Earth EngineEarth Engine - function for printing multiple histogramsEarth Engine create user defined function with default parametersGoogle Earth Engine formaTrend function
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
I am trying to calculate the red-edgeNDVI ((NIR – red edge)/(NIR + red edge)) of an Image.Collection in Google Earth Engine. There is a built in function for NDVI but not for red-edge NDVI. The code I have is below but I get the error message "image.NIR is undefined". I'm sure this is a simple syntax issue related to the function but I've tried everything I could think of and I just can't get it to work.
Can you tell me what I'm missing?
/**
* Function to mask clouds using the Sentinel-2 QA band
* @param ee.Image image Sentinel-2 image
* @return ee.Image cloud masked Sentinel-2 image
*/
function maskS2clouds(image)
var qa = image.select('QA60');
// Bits 10 and 11 are clouds and cirrus, respectively.
var cloudBitMask = 1 << 10;
var cirrusBitMask = 1 << 11;
// Both flags should be set to zero, indicating clear conditions.
var mask = qa.bitwiseAnd(cloudBitMask).eq(0)
.and(qa.bitwiseAnd(cirrusBitMask).eq(0));
return image.updateMask(mask)
.divide(10000);
// Load Sentinel-2 TOA reflectance data.
var S2 = ee.ImageCollection('COPERNICUS/S2')
.filterDate('2017-06-01', '2017-09-30')
// Pre-filter to get less cloudy granules.
.filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 20))
//Select required bands only
.select('B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B8', 'B8A', 'QA60')
//Apply cloud mask
.map(maskS2clouds);
//Create band variables
var redEdge = S2.select('B5');
var NIR = S2.select('B8');
//Function to calculate redEdgeNDVI
var add_reNDVI = function(image)
var redEdgeNDVI = image.NIR.subtract(redEdge).divide(NIR.add(redEdge)).rename('reNDVI');
return image.addBands(reNDVI);
;
google-earth-engine function vegetation-index
add a comment |
I am trying to calculate the red-edgeNDVI ((NIR – red edge)/(NIR + red edge)) of an Image.Collection in Google Earth Engine. There is a built in function for NDVI but not for red-edge NDVI. The code I have is below but I get the error message "image.NIR is undefined". I'm sure this is a simple syntax issue related to the function but I've tried everything I could think of and I just can't get it to work.
Can you tell me what I'm missing?
/**
* Function to mask clouds using the Sentinel-2 QA band
* @param ee.Image image Sentinel-2 image
* @return ee.Image cloud masked Sentinel-2 image
*/
function maskS2clouds(image)
var qa = image.select('QA60');
// Bits 10 and 11 are clouds and cirrus, respectively.
var cloudBitMask = 1 << 10;
var cirrusBitMask = 1 << 11;
// Both flags should be set to zero, indicating clear conditions.
var mask = qa.bitwiseAnd(cloudBitMask).eq(0)
.and(qa.bitwiseAnd(cirrusBitMask).eq(0));
return image.updateMask(mask)
.divide(10000);
// Load Sentinel-2 TOA reflectance data.
var S2 = ee.ImageCollection('COPERNICUS/S2')
.filterDate('2017-06-01', '2017-09-30')
// Pre-filter to get less cloudy granules.
.filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 20))
//Select required bands only
.select('B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B8', 'B8A', 'QA60')
//Apply cloud mask
.map(maskS2clouds);
//Create band variables
var redEdge = S2.select('B5');
var NIR = S2.select('B8');
//Function to calculate redEdgeNDVI
var add_reNDVI = function(image)
var redEdgeNDVI = image.NIR.subtract(redEdge).divide(NIR.add(redEdge)).rename('reNDVI');
return image.addBands(reNDVI);
;
google-earth-engine function vegetation-index
add a comment |
I am trying to calculate the red-edgeNDVI ((NIR – red edge)/(NIR + red edge)) of an Image.Collection in Google Earth Engine. There is a built in function for NDVI but not for red-edge NDVI. The code I have is below but I get the error message "image.NIR is undefined". I'm sure this is a simple syntax issue related to the function but I've tried everything I could think of and I just can't get it to work.
Can you tell me what I'm missing?
/**
* Function to mask clouds using the Sentinel-2 QA band
* @param ee.Image image Sentinel-2 image
* @return ee.Image cloud masked Sentinel-2 image
*/
function maskS2clouds(image)
var qa = image.select('QA60');
// Bits 10 and 11 are clouds and cirrus, respectively.
var cloudBitMask = 1 << 10;
var cirrusBitMask = 1 << 11;
// Both flags should be set to zero, indicating clear conditions.
var mask = qa.bitwiseAnd(cloudBitMask).eq(0)
.and(qa.bitwiseAnd(cirrusBitMask).eq(0));
return image.updateMask(mask)
.divide(10000);
// Load Sentinel-2 TOA reflectance data.
var S2 = ee.ImageCollection('COPERNICUS/S2')
.filterDate('2017-06-01', '2017-09-30')
// Pre-filter to get less cloudy granules.
.filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 20))
//Select required bands only
.select('B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B8', 'B8A', 'QA60')
//Apply cloud mask
.map(maskS2clouds);
//Create band variables
var redEdge = S2.select('B5');
var NIR = S2.select('B8');
//Function to calculate redEdgeNDVI
var add_reNDVI = function(image)
var redEdgeNDVI = image.NIR.subtract(redEdge).divide(NIR.add(redEdge)).rename('reNDVI');
return image.addBands(reNDVI);
;
google-earth-engine function vegetation-index
I am trying to calculate the red-edgeNDVI ((NIR – red edge)/(NIR + red edge)) of an Image.Collection in Google Earth Engine. There is a built in function for NDVI but not for red-edge NDVI. The code I have is below but I get the error message "image.NIR is undefined". I'm sure this is a simple syntax issue related to the function but I've tried everything I could think of and I just can't get it to work.
Can you tell me what I'm missing?
/**
* Function to mask clouds using the Sentinel-2 QA band
* @param ee.Image image Sentinel-2 image
* @return ee.Image cloud masked Sentinel-2 image
*/
function maskS2clouds(image)
var qa = image.select('QA60');
// Bits 10 and 11 are clouds and cirrus, respectively.
var cloudBitMask = 1 << 10;
var cirrusBitMask = 1 << 11;
// Both flags should be set to zero, indicating clear conditions.
var mask = qa.bitwiseAnd(cloudBitMask).eq(0)
.and(qa.bitwiseAnd(cirrusBitMask).eq(0));
return image.updateMask(mask)
.divide(10000);
// Load Sentinel-2 TOA reflectance data.
var S2 = ee.ImageCollection('COPERNICUS/S2')
.filterDate('2017-06-01', '2017-09-30')
// Pre-filter to get less cloudy granules.
.filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 20))
//Select required bands only
.select('B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B8', 'B8A', 'QA60')
//Apply cloud mask
.map(maskS2clouds);
//Create band variables
var redEdge = S2.select('B5');
var NIR = S2.select('B8');
//Function to calculate redEdgeNDVI
var add_reNDVI = function(image)
var redEdgeNDVI = image.NIR.subtract(redEdge).divide(NIR.add(redEdge)).rename('reNDVI');
return image.addBands(reNDVI);
;
google-earth-engine function vegetation-index
google-earth-engine function vegetation-index
edited 2 days ago
PolyGeo♦
54.1k1782248
54.1k1782248
asked Apr 24 at 19:42
Adam GAdam G
406
406
add a comment |
add a comment |
1 Answer
1
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oldest
votes
In your code, S2
is an ImageCollection
, so when you "create band variables" you're just getting ImageCollections in which every image inside has only the selected band, which is useful. As you well commented, add_reNDVI
is a function that will take every image in the collection and calculate reNDVI. So you have to map
that function over the collection to get what you want.
// Load Sentinel-2 TOA reflectance data.
var S2 = ee.ImageCollection('COPERNICUS/S2')
.filterDate('2017-06-01', '2017-09-30')
// Pre-filter to get less cloudy granules.
.filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 20))
//Select required bands only
.select('B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B8', 'B8A', 'QA60')
//Apply cloud mask
.map(maskS2clouds);
//Function to calculate redEdgeNDVI
var add_reNDVI = function(image)
//Create band variables
var redEdge = image.select('B5');
var NIR = image.select('B8');
var redEdgeNDVI = NIR.subtract(redEdge).divide(NIR.add(redEdge)).rename('reNDVI');
return image.addBands(redEdgeNDVI);
;
var s2_reNDVI = S2.map(add_reNDVI)
Map.centerObject(s2_reNDVI.first())
Map.addLayer(s2_reNDVI.first())
I guess you'll need to filter by bounds at some point, that is why I just took the first image out of the collection to check if it's working
Thanks @Rodrigo. This worked fine. I've posted a follow-up question (gis.stackexchange.com/questions/320967/…). I supect you may be able to answer this one too.
– Adam G
2 days ago
add a comment |
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1 Answer
1
active
oldest
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
In your code, S2
is an ImageCollection
, so when you "create band variables" you're just getting ImageCollections in which every image inside has only the selected band, which is useful. As you well commented, add_reNDVI
is a function that will take every image in the collection and calculate reNDVI. So you have to map
that function over the collection to get what you want.
// Load Sentinel-2 TOA reflectance data.
var S2 = ee.ImageCollection('COPERNICUS/S2')
.filterDate('2017-06-01', '2017-09-30')
// Pre-filter to get less cloudy granules.
.filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 20))
//Select required bands only
.select('B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B8', 'B8A', 'QA60')
//Apply cloud mask
.map(maskS2clouds);
//Function to calculate redEdgeNDVI
var add_reNDVI = function(image)
//Create band variables
var redEdge = image.select('B5');
var NIR = image.select('B8');
var redEdgeNDVI = NIR.subtract(redEdge).divide(NIR.add(redEdge)).rename('reNDVI');
return image.addBands(redEdgeNDVI);
;
var s2_reNDVI = S2.map(add_reNDVI)
Map.centerObject(s2_reNDVI.first())
Map.addLayer(s2_reNDVI.first())
I guess you'll need to filter by bounds at some point, that is why I just took the first image out of the collection to check if it's working
Thanks @Rodrigo. This worked fine. I've posted a follow-up question (gis.stackexchange.com/questions/320967/…). I supect you may be able to answer this one too.
– Adam G
2 days ago
add a comment |
In your code, S2
is an ImageCollection
, so when you "create band variables" you're just getting ImageCollections in which every image inside has only the selected band, which is useful. As you well commented, add_reNDVI
is a function that will take every image in the collection and calculate reNDVI. So you have to map
that function over the collection to get what you want.
// Load Sentinel-2 TOA reflectance data.
var S2 = ee.ImageCollection('COPERNICUS/S2')
.filterDate('2017-06-01', '2017-09-30')
// Pre-filter to get less cloudy granules.
.filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 20))
//Select required bands only
.select('B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B8', 'B8A', 'QA60')
//Apply cloud mask
.map(maskS2clouds);
//Function to calculate redEdgeNDVI
var add_reNDVI = function(image)
//Create band variables
var redEdge = image.select('B5');
var NIR = image.select('B8');
var redEdgeNDVI = NIR.subtract(redEdge).divide(NIR.add(redEdge)).rename('reNDVI');
return image.addBands(redEdgeNDVI);
;
var s2_reNDVI = S2.map(add_reNDVI)
Map.centerObject(s2_reNDVI.first())
Map.addLayer(s2_reNDVI.first())
I guess you'll need to filter by bounds at some point, that is why I just took the first image out of the collection to check if it's working
Thanks @Rodrigo. This worked fine. I've posted a follow-up question (gis.stackexchange.com/questions/320967/…). I supect you may be able to answer this one too.
– Adam G
2 days ago
add a comment |
In your code, S2
is an ImageCollection
, so when you "create band variables" you're just getting ImageCollections in which every image inside has only the selected band, which is useful. As you well commented, add_reNDVI
is a function that will take every image in the collection and calculate reNDVI. So you have to map
that function over the collection to get what you want.
// Load Sentinel-2 TOA reflectance data.
var S2 = ee.ImageCollection('COPERNICUS/S2')
.filterDate('2017-06-01', '2017-09-30')
// Pre-filter to get less cloudy granules.
.filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 20))
//Select required bands only
.select('B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B8', 'B8A', 'QA60')
//Apply cloud mask
.map(maskS2clouds);
//Function to calculate redEdgeNDVI
var add_reNDVI = function(image)
//Create band variables
var redEdge = image.select('B5');
var NIR = image.select('B8');
var redEdgeNDVI = NIR.subtract(redEdge).divide(NIR.add(redEdge)).rename('reNDVI');
return image.addBands(redEdgeNDVI);
;
var s2_reNDVI = S2.map(add_reNDVI)
Map.centerObject(s2_reNDVI.first())
Map.addLayer(s2_reNDVI.first())
I guess you'll need to filter by bounds at some point, that is why I just took the first image out of the collection to check if it's working
In your code, S2
is an ImageCollection
, so when you "create band variables" you're just getting ImageCollections in which every image inside has only the selected band, which is useful. As you well commented, add_reNDVI
is a function that will take every image in the collection and calculate reNDVI. So you have to map
that function over the collection to get what you want.
// Load Sentinel-2 TOA reflectance data.
var S2 = ee.ImageCollection('COPERNICUS/S2')
.filterDate('2017-06-01', '2017-09-30')
// Pre-filter to get less cloudy granules.
.filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 20))
//Select required bands only
.select('B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B8', 'B8A', 'QA60')
//Apply cloud mask
.map(maskS2clouds);
//Function to calculate redEdgeNDVI
var add_reNDVI = function(image)
//Create band variables
var redEdge = image.select('B5');
var NIR = image.select('B8');
var redEdgeNDVI = NIR.subtract(redEdge).divide(NIR.add(redEdge)).rename('reNDVI');
return image.addBands(redEdgeNDVI);
;
var s2_reNDVI = S2.map(add_reNDVI)
Map.centerObject(s2_reNDVI.first())
Map.addLayer(s2_reNDVI.first())
I guess you'll need to filter by bounds at some point, that is why I just took the first image out of the collection to check if it's working
answered Apr 24 at 20:16
Rodrigo E. PrincipeRodrigo E. Principe
4,57411021
4,57411021
Thanks @Rodrigo. This worked fine. I've posted a follow-up question (gis.stackexchange.com/questions/320967/…). I supect you may be able to answer this one too.
– Adam G
2 days ago
add a comment |
Thanks @Rodrigo. This worked fine. I've posted a follow-up question (gis.stackexchange.com/questions/320967/…). I supect you may be able to answer this one too.
– Adam G
2 days ago
Thanks @Rodrigo. This worked fine. I've posted a follow-up question (gis.stackexchange.com/questions/320967/…). I supect you may be able to answer this one too.
– Adam G
2 days ago
Thanks @Rodrigo. This worked fine. I've posted a follow-up question (gis.stackexchange.com/questions/320967/…). I supect you may be able to answer this one too.
– Adam G
2 days ago
add a comment |
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