Hello Laura. If you are working with ArcGIS, I think you can use the conditional toolset and the function con. See https://desktop.arcgis.com/en/arcmap/10.6/tools/spatial-analyst-toolbox/con-.htm

Use ArcMap GIS or ENVI

I am currently working with a DEM with a cell size of 10 meters. I only needed a certain area of this DEM and wanted it at a 1 m cell size so I extracted by mask. I set the appropriate environmental settings to obtain a cell size of 1 m and my mask layer was also set to 1 m cell size (same coordinate system as well).

My output does indeed have a cell size of 1 m, but you can see from the following image two different sized cells. Along the edges measure 1 m, but the cells in the middle measure about 8 meters (this is the cell size of the original DEM before I clipped it).

I am currently working with a DEM with a cell size of 10 meters. I only needed a certain area of this DEM and wanted it at a 1 m cell size so I extracted by mask. I set the appropriate environmental settings to obtain a cell size of 1 m and my mask layer was also set to 1 m cell size (same coordinate system as well).

My output does indeed have a cell size of 1 m, but you can see from the following image two different sized cells. Along the edges measure 1 m, but the cells in the middle measure about 8 meters (this is the cell size of the original DEM before I clipped it).

I'm wondering if my clipped DEM does in fact have a 1 m cell size or is something wrong here?

The point of setting my cell size at 1m was to obtain a smooth look. Possibly those larger cells really are 8 1m cells, all of the same values? I have tried resampling with bilinear interpolation and I get the exact same result.

I am using ArcGIS 10.5.1 Version 10.5.1.7333.

The most similar question I have been able to find, but which did not seem to have a final solution/one that solves my particular problem is Cell size (10m) in Raster properties differs from measured cell size (20m) in multiband (Sentinel) raster?

My normal work product using Global Mapper involves integrating DEMs from various sources that are at different resolutions. By controlling the position of those overlays with the lowest resolution loaded first (at the "bottom of the stack" - although it is first in the listing), through the highest. I then generate a "grid file" (.gmg) and set the output resolution to a desired value.

• Look at Golden software’s Surfer program....excellent at overlaying two DEM files in 3D and at manipulating cell sizes

Based on Paul Griesberger comment, i would recomment to apply something like that in Raster Calculator (Map Algebra) in ArcGIS:

Con("demA" < 1,"demB","demA")

Where demA is the the one with the gaps and demB is the one that you will use in order to fill in the gaps of demA.

I hope this was helpful!

Purpose of overlay is not given. Although it may done for various purposes from quality assessment of DEM to DEM Assimilation or fusion.

ERDAS Modeler or ArcGIS Raster Calculator: Anyone can be used, however accuracy will depend on planimetric accuracy also.

Article Morphometric measurements of cinder cones from digital eleva...

“The horizontal and vertical errors usually cannot be separated: incorrect elevation could appear at the correct location, or the error may be due to a correct elevation in the wrong location”

best wishes,

Co-registration process (ENVI Tools)