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I have calculated the NDVI image and overlain GPS coordinates for a pack of wild animals over the top.
I would like to calculate the average NDVI of all the GPS points, and then calculate the average for all of the random points that I have also put over the top. I would like to do this for the entire map, and Zonal Statistics does not seem to be helping.
For getting the NDVI values for the points use Point sampling tool plugin. This plugin generate new point layer (based on input layer) with additional attribute with values taken from raster data.
Then calculate average.
Inside QGIS:
Use Basic statistics for numeric fields from processing toolbox (or menu Vector --> Analysis Tools). This function generates html file with several statistics for given attribute. You can also view the results in menu Processing --> Results Viewer...
or outside QGIS :
Export (right click on layer Save as...) layers as .csv file or copy-paste only their attribute tables with Copy selected rows to clipboard (need to do selection first). Then you can handle your data in some spreadsheet editor.
Add Delimited Text Layer function for this - see Creating a link between QGIS and a spreadsheet
Mar 22, 2017 at 13:25
Try the following (using QGIS 3.16.9 Hanover): Go to menu "Raster" --> "Miscellaneous" --> "Raster information". For input layer, select your NDVI raster file. Tick the box "Read and display image statistics". Save the file in desired location. Click "Run". Once the process is completed, open the html file and look for mean value.
Hope this helps?
