topic Re: Cell size question for reprojecting a raster in ArcGIS Pro Questions

Cell size question for reprojecting a raster

ChrisRandle — Tue, 16 Mar 2021 19:07:23 GMT

I am using ArcGIS Pro 'Project Raster' to convert a projected raster to GCS. The raster is a crop data layer using: USA Contiguous Albers Equal Area Conic USGS Version with a spheroid of GRS 1980 and datum of NAD83. It has a resolution of 30meters. I would like to re-project this raster to World Geodetic System 1984 (WGS84).

My question is for the Project Raster cell size field, do I enter '30' (30 meters) -Or- leave the cell size field blank and run the tool.

Thank you for your time,

Chris

Re: Cell size question for reprojecting a raster

curtvprice — Tue, 16 Mar 2021 20:07:56 GMT

If you are projecting to GCS the output xy coordinates would be in degrees, so if you want to set it to an exact value you could use 1-arc-second, which is at about 30m in length over most of the earth. 1/3600 = 0.000278 degrees so that would be a good value to use to preserve the resolution. and not drop data cells.

These data are usually handled in a projected coordinate system so that area calculations are accurate. Why are you converting this to GCS?

Re: Cell size question for reprojecting a raster

ChrisRandle — Tue, 16 Mar 2021 20:21:57 GMT

Thanks so much for your quick response. I'm working with some older python code. I agree, things should be left as projected. This will change in the near future. I really appreciate your explanation--helps clarify things as I learn and grow in GIS.

Re: Cell size question for reprojecting a raster

DanPatterson — Tue, 16 Mar 2021 21:40:16 GMT

you should read these

Cell Size Projection Method (Environment setting)—ArcGIS Pro | Documentation

How the Cell Size Projection Method environment setting works—ArcGIS Pro | Documentation

Re: Cell size question for reprojecting a raster

ChrisRandle — Tue, 16 Mar 2021 23:12:17 GMT

Thanks Dan,

I really liked the 2nd link on how cell size works. Clears up a lot for me. Most appreciated!