topic Re: Clipping a raster file multiple times, based on area-divided polygon in ArcMap Questions

Clipping a raster file multiple times, based on area-divided polygon

mohasmohas — Tue, 24 Nov 2020 21:55:55 GMT

Hello. I have a polygon that is divided at 5 small areas, and a raster file that contains the whole area of my project. I want to clip my raster file according to every area of my polygon, is there a way to do it not manually and end up with a different layer for every small area? Thanks in advance for your time.

Re: Clipping a raster file multiple times, based on area-divided polygon

Anonymous User — Wed, 25 Nov 2020 01:46:21 GMT

If you have Spatial Analyst you can use extract by Polygon or by Mask.

See link below.

https://desktop.arcgis.com/en/arcmap/10.3/tools/spatial-analyst-toolbox/extract-by-polygon.htm

You can batch the GP tool or use Model Builder or use Python if you have to do this multiple times. Depending on what you want to do.

Hope this helps.

Re: Clipping a raster file multiple times, based on area-divided polygon

mohasmohas — Wed, 25 Nov 2020 09:02:44 GMT

Thank you for your response. Actually i want to use use the extract by mask tool for each row of my polygon's attribute table. Can i model it with Model Builder?

Re: Clipping a raster file multiple times, based on area-divided polygon

DavidPike — Wed, 25 Nov 2020 09:53:37 GMT

sure:

Iterate Feature Selection (ModelBuilder)—ArcGIS Pro | Documentation

Re: Clipping a raster file multiple times, based on area-divided polygon

anner_paldor — Wed, 23 Dec 2020 23:52:00 GMT

Thank you for this, it really helped me. I have a follow-up, I hope it's okay. If I want to save an output for each model iteration in a different name, is there a way to do this? What I'm trying to do is take a DEM, extract chunks of it based on polygons in a polygon layer (which is where the iterate tool came in handy) but then from each extracted chunk I want to save an ASCII file (with raster to ASCII) of a different name (say, based on the FID of the polygon in each respective iteration). See the attached model graphic if it helps.

Many thanks in advance,

Anner.

Re: Clipping a raster file multiple times, based on area-divided polygon

DavidPike — Thu, 24 Dec 2020 11:26:48 GMT

Of course, it's called in-line variable substitution.

Inline variable substitution—ArcGIS Pro | Documentation - 'use with an iterator' paragraph

Examples of in-line variable substitution with ModelBuilder system variables—Help | ArcGIS for Desktop - 'Using the %n% system variable with in-line variable substitution'

Basically use %n% which represents the number of each iteration.

Samp%n%.asc -> Samp1.asc, Samp2.asc, Samp3.asc...

Re: Clipping a raster file multiple times, based on area-divided polygon

anner_paldor — Thu, 24 Dec 2020 23:02:39 GMT

This worked perfectly. Thank you so much.