My Slope and DEM data have equal Number of Rows and Columns but my NWI data is not having equally rows and columns how do i solve that issue
As you know, NRow and NCol and "lower left corner attributes" must match precisely.
In the QGIS world we use GDAL WARP to ensure that this is the case.
It is best to set the attributes precisely when converting from NWI polygons into a raster because re-projecting or moving raster files can result in data loss.
I cannot speak to the ESRI world -- anyone else?
Best regards -- Jonathan
Emma,
I think one way you can do it is when you convert the polygon (NWI shp) to a raster through the tool you can set the processing extent the already created DEM raster through the "environments.." button to match your other rasters. There should be a box you can click where it will snap to the raster.