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I found this link on how to change pixel values using the raster calculator: Changing pixel values using QGIS raster calculator?


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I would suggest the following: In the attribute table of the vector layer, make a new column called "value", and give a -200 value to the column (or any other value that you want to assign as a new depth/height). Convert your polygon to a raster. You can do this with the Rasterize tool (raster>conversion>rasterize). Make sure the new ...


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The EFAL driver is written, maintained, and delivered by the MapInfo team, earlier under Pitney Bowes and now as a part of Precisely. If you have troubles you can contact your MapInfo support. The GDAL development team cannot help you. In this case you should be able to help yourself. Download the two files from https://support.precisely.com/product-...


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I've made a recipe. In fact, I do not really exactly answer the question as I do not change order of your polygon(s) nodes but simply try to solve the issue of changing numbering of nodes according to your screenshot. The recipe calculates the position of the northern vertex of your polygon and then use it to change numbers ordering. It avoids reconstructing ...


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so I found a solution on my own too using the Raster Calculator from the Raster menu. I clipped my raster to the shapefile I wanted using the "Clip raster by mask layer from GDAL: I opened the raster calculator: Then I double-clicked the raster I wanted to modify and typed "-200" in the calculator and my expression became "'Clipped (...


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