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I am working on QGIS. I have a raster of EVI, in which values are comprised between 0 and 1. I need to vectorize this raster in order to make an intersection with another vector.

My issue is that when I vectorize my raster, the values are either 0 or 1, but I want the values detailed between 0 and 1. The best would be to have the values every 0.1 (0.1, 0.2, 0.3, ...). Do you have any idea of how I can proceed?

I was thinking that I could multiply the values of the raster by a hundred, but is that even possible?

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2 Answers 2

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Use the "Raster pixels to polygons" tool. It will convert the floating point values correctly.

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Command line is the easiest, with GDAL tools.

  1. Convert the raster to XYZ data:

    gdal_translate -of XYZ input.tif input.csv

  2. Use an editor to filter out any nodata values in the CSV file if you prefer

  3. Filter out a range of pixels according to the value of the raster (Z-value) if required.

  4. Load the XYZ data as a delimited text file in QGIS.

You can now use the layer to intersect with other vectors.

Grid

Grid

Points

Points

Filtered and Styled Points

Filtered and Styled Points

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