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Accessing Sentinel-2 imagery via STAC

Here are some good resources you can start with: NDVI from Sentinel-2 Imagery Using STAC STAC example notebooks
OSS_enthusiast's user avatar
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Harmonized Landsat-7 NDVI time series values are all the same when calculated with Google Earth Engine

I don't think that is the intended use of ee.ImageCollection.iterate, but there is a simpler way of retrieving time series over multiple points for an image collection: using ee.Image.reduceRegions. ...
Oliver Lopez's user avatar
1 vote

Max pixel issue exporting NDVI map (Landsat 5 and 8) from GEE

You are trying to export the whole world in 10m scale: print(NDVI_diff.geometry()) Polygon, 5 vertices type: Polygon coordinates: List (1 element) 0: List (5 elements) 0: [-180,-90] 1: [180,-90] ...
Daniel Wiell's user avatar
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1 vote

Image.constant: Parameter 'value' is required

The issue is that reduceRegion() returns null for some images. All pixels in your geometry are probably masked. One option to workaround this is to filter out images with null min/max. var col = ee....
Daniel Wiell's user avatar
  • 12.9k
1 vote

Calculating LST and NDVI in Single Graph for comparison

Deleting 'select' part in following line: var merged = LST_col.merge(ndvi_chart).select(['NDVI', 'LST']) to get this: var merged = LST_col.merge(ndvi_chart) the code runs without any problem. ...
xunilk's user avatar
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0 votes

Error when calculating NDVI using raster calculator in QGIS

If you are using OpenCL acceleration, deactive it.
user224969's user avatar
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Vegetation indices extraction from RGB images

You can make a fake NDVI (so called "false NDVI") using: (Green - Red)/(Green + Red - Blue) Though for me this failed to pick up the more orangey colour of eucalypts, plus it also gave some ...
Buff Fox's user avatar
  • 104
0 votes

Error while using Raster Calculator to calculate NDVI in QGIS

I found something that works, I don't know if that's the main reason why my operation didn't work. When I wrote the question the layers obtained by exporting the Sentinel II data were in "jp2&...
Alexandre Lescure's user avatar

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