I created TIN from contour lines, then I convert this TIN to Raster.
After that I clipped the raster by
Extract by Mask tool,
now the problem is raster does not fill whole boundary.
Below image show the problem, how can I figure out this?
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I just had to do this myself. I followed another post as guidance How to extend raster data for larger boundary?
What you're looking for is a Euclidean Allocation. Make sure you specify the shapefile boundary in the processing extent.