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How to remove small polygons from layer in QGIS?
(It’s basically the same problem as here: Removing small “salt & pepper” polygons from layer in QGIS?, only for raster instead of vector data…) I suppose your pixel size is 10m². You could use the gdal sieve function you can find in the Raster menu to remove lonely pixels. You can also launch it by searching in the command line :
How to set all pixels with value < = 0 in QGIS?
Right click on the raster, go to raster properties, select the third option “transparency”, in no data value tab, add additional value 0 and click apply.This is the similar option “display background value” in arcgis. Thanks for contributing an answer to Geographic Information Systems Stack Exchange! Please be sure to answer the question.
How do you remove lonely pixels from raster?
You could use the gdal sieve function you can find in the Raster menu to remove lonely pixels. You can also launch it by searching in the command line : The gdal_sieve.py script removes raster polygons smaller than a provided threshold size (in pixels) and replaces replaces them with the pixel value of the largest neighbour polygon.
Which is correct for QGIS 2.8.3?
Many thanks to Dominik. My first answer is not correct for QGIS 2.8.3 (the expression “myraster@1” > 0 returns 0 or 1 for non- nodata input, for nodata input it returns nodata ).
How to remove the sampled points from QGIS?
Hold the Shift key and select Sampled Points and 2018_Gaz_ua_national layers. Right-click and select Remove to remove them from QGIS. When prompted for Remove 2 legend entries?, select OK.
How to generate regular points in QGIS 2.18?
I am also not sure how to interpret this default given that I am in UTMs. In QGIS 2.18 you can use the tool “Vectorial”>”Research tools”>”Regular points”.
How to remove small salt and pepper polygons?
Simply deleting the features won’t help, since the polygons will leave holes behind, as you have already noticed. Instead, you can merge the vertical streets with a neighbouring large polygon using “Vector / Geoprocessing tools / Eliminate sliver polygons”, saving the result to a new file.
How do you remove polygons from a raster band?
The gdal_sieve.py script removes raster polygons smaller than a provided threshold size (in pixels) and replaces replaces them with the pixel value of the largest neighbour polygon. The result can be written back to the existing raster band, or copied into a new file.