New answers tagged raster-calculator
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Cropping raster layer using QGIS?
A quick update to @Simbamangu's answer as of 2022.
In the current version of QGIS (I use 3.2x) click menu item Raster -> Extraction -> Clip Raster by Extent.
In the tool window that opens ...
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Flow Direction tool outputs strange raster that doesn't work with subsequent hydrology tools
If you want to have exactly a flow direction raster with 8 numbers from 1 to 128, you should use the "fill" tool for your inverted DEM, then use the resulting raster as input for the "...
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Not sure why I am getting a raster error (Error 000732) when incorporating parameter weights in my raster calculation?
In the model, set your weight parameters as a numeric type, either floating point (double type) or integer (long type).
In the raster calculator, cast your weights to numeric using
float("%weight ...
- 55.6k
1
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Accepted
Combinations and calculations with raster data in QGIS
It seems that in QGIS this is a 3-step job:
use Cell statistics from Processing toolbar to calculate MINIMUM from 12 monthly raster layers (see screenshot of the tool below)
analogically MAXIMUM ...
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Normalize raster in R
The first answer did not work for me:
nx <- minmax(accstack) ##accstack is a 1.6Gb tiff file imported as SpatRaster
Warning message: [minmax] min and max values not available. See 'setMinMax' or ...
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Merge raster layers with NoData cells
Copy of this answer: https://gis.stackexchange.com/a/425197/92995 In QGIS/processing, use the GRASS tool "r.series". As "Aggregate operation" choose "average"/"...
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Summing two rasters of different extents in QGIS
Make sure both rasters are in the same CRS. The trick to get the whole extent is to create a virtual raster.
In case the initial rasters contain nodata values, use Fill nodata cells on both rasters ...
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QgsRasterCalculator not writing any output nor showing error codes
There are several suggestions regarding your code:
work with os.path package and its methods: basename, exists, join, and normpath
TIFF is a raster dataset containing one or more layers called bands....
- 25.8k
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QgsRasterCalculator not writing any output nor showing error codes
I've found the solution, based on Taras' comment. The issue was indeed in not assigning the band number. I fixed it by removing exp and ras.ref, and replacing it with
ras.ref = 'test@1'
exp = "%s*...
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Terracing and data format issues when converting DEM from float32 to UInt16
I had similar issues and it disappeared when using only displacement and not displacement+bump (under material properties/settings/surface/displacement set to displacement only.
It is related to ...
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Layer not visible under Raster Calculator but visible in the Tree Panel
OK, i ve found an answer myself.
Just need to add an extra step to be visible in processing tools:
QgsProject.instance().addMapLayer(mapLayer=out_layer,addToLegend=False)
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Raster Calculation with Rasters of Different Extent using Rasterio
I think creating a window from the bounds of the larger raster then using that window with boundless=True to read the smaller raster should work.
Something like:
window = rasterio.windows.from_bounds(*...
- 55.6k
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Recalculate raster
It seems that it is indeed the 'nodata' value - the actual value is presumably dependent on the data type.
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Using Raster Calculator without Clipping to Extent of Smallest Raster (QGIS)
The QGIS raster calculator is a front end to the gdal_calc Python utility https://gdal.org/programs/gdal_calc.html. The utility has an option for controlling the behavior with extent:
--extent=<...
- 55.3k
1
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Accepted
QGIS Python script with Raster Calculator
I think it's easier to use GDAL raster calculator. I execute the tool manually once in QGIS, press Ctrl+Alt+H and copy the command. Then write the loop.
To create the output names you can use layer....
- 56.9k
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