topic Clip a raster using features in feature class in Geoprocessing Questions

Clip a raster using features in feature class

ClaireParsons1 — Mon, 20 Feb 2012 11:55:27 GMT

Hi All

I have got a raster dataset that I want clipped into several new rasters by each feature in polygon feature class.
I'd like to know hope i could 'loop' through each polygon in the feature class to clip the raster dataset.

thanks
Claire

Re: Clip a raster using features in feature class

TorbjørnDalløkken — Fri, 24 Feb 2012 18:13:55 GMT

Hi!

I havn't had the opportunity to try this, but it may give you some advice. Do you have the Spatial Analysis extention? If you're using modelbuilder and ArcGIS 10, you might start by taking your featureclass connect it to the new iterator in modelbuilder, Iterate Feature Selection. In the iterator you can set which field you want to select by; if no input is given, then each of the seperate polygons are used. Then combine the output selection with the tool Extract Raster by Mask and connect the rasterimage. If you'd like to give the rasters a name that represents the field value of the selected feature in your featureclass, give the output from Extract Raster By Mask the name %Value% (which is one of the outputs from the iterator). The model might look similar to the sample I've drawn...

I hope this helps. 🙂

Re: Clip a raster using features in feature class

DavidGordon1 — Tue, 27 Nov 2012 15:01:36 GMT

I'm trying to do a similar operation that Claire seemed to have been asking about. In my case, I want to extract 155 separate areas from a raster using a shp file with 155 circular buffers as masks. I set up the model as described in model builder and it successfully iterated through the dataset. However, the output rasters kept overwriting the last file so I ended up with only one raster at the end of the run. Clearly I don't understand how to specify the output from the Extract by Mask. Can someone help me?

Dave

Re: Clip a raster using features in feature class

EricRice — Tue, 27 Nov 2012 18:13:36 GMT

David,

You probably didn't use an inline variable for the output raster, which is why it was overwriting. See, Examples of inline model variable substitution, specifically Ex 2.

Best,
Eric

Re: Clip a raster using features in feature class

DavidGordon1 — Tue, 27 Nov 2012 20:21:10 GMT

Thank you Eric! That article provided the information about variables I needed. I finally got my model to work.

Dave