New answers tagged ndvi
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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
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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.
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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] ...
- 12.9k
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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....
- 12.9k
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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. ...
- 28.6k
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Error when calculating NDVI using raster calculator in QGIS
If you are using OpenCL acceleration, deactive it.
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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 ...
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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&...
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