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When you use the -a_srs flag you are telling GDAL that you know that the projection of the raster is the following epsg code (in your case EPSG:4326) but that is not the projection of your raster (grid_mapping=Lambert_Conformal). There isn't enough information encoded in the raster to tell us what the actual projection is but you should be able to find it ...


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A raster is a set of cells that form a grid; each cell has a value. When you reproject a raster, you are re-drawing the grid to be aligned with a new projection. So, in the below figure, your original raster grid is shown in blue, and the reprojected grid is shown in red. Right away you can see a problem--the grids do not align. So, for example, in the ...


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