topic Why do raster datasets need to be resampled when panning and zooming in ArcGIS Pro? in ArcGIS Pro Questions

Why do raster datasets need to be resampled when panning and zooming in ArcGIS Pro?

BillGrimm — Tue, 02 Jun 2026 18:19:38 GMT

This might be a silly question. I understand that resampling is the process of interpolating new cell values when a raster is transformed to a new coordinate space or cell size. However, why is there an option to set the resampling method in the Rendering group of the Image Layer/Raster Layer/etc. tabs in ArcGIS Pro? In other words, why do you need to resample when simply panning and zooming a raster (as opposed to running it through a geoprocessing tool)?

Re: Why do raster datasets need to be resampled when panning and zooming in ArcGIS Pro?

Robert_LeClair — Wed, 03 Jun 2026 15:25:56 GMT

The Resampling setting in the Rendering group controls display resampling (on-the-fly)—how ArcGIS Pro draws your raster to the screen when the raster grid does not map 1:1 to your current view.

Even when you “just pan and zoom,” Pro often has to compute a new value/color for each screen pixel because:

Zooming changes the pixel-to-pixel relationship: at most scales, one screen pixel corresponds to a fraction of a raster cell or multiple raster cells, so Pro must decide how to sample/average values to draw the image.
The map may be in a different coordinate system than the raster: if so, Pro is also doing an on-the-fly reprojection for display, which requires interpolation.
The goal is visualization quality vs speed, and the “best” method depends on whether the raster is categorical (classes) or continuous (imagery/elevation).

That’s why the method matters for display:

Nearest neighbor: fastest; best for discrete/categorical rasters; preserves original values but can look blocky/jagged.
Bilinear: smoother for continuous rasters; alters values (can blur).
Cubic: sharper than bilinear but slower; can introduce values outside the input range.
Majority: often used for discrete rasters to smooth class “speckle.”

Hope this helps!

Re: Why do raster datasets need to be resampled when panning and zooming in ArcGIS Pro?

BillGrimm — Thu, 04 Jun 2026 13:12:39 GMT

That helps, thanks!