topic Re: How to perform reverse clip? in ArcGIS Spatial Analyst Questions

How to perform reverse clip?

GwanSeonKim — Wed, 15 Feb 2017 16:29:56 GMT

Hi,

I would like to delete overlapped area and get not-overlapped raster image.

I tried to use clip tool, but clip tool only provided overlapped areas.

I have one base raster layer (brown pixels) and one polygon (pink color).

Do you have any idea how to deleted overlapped area?

Alternatively, I also have two raster layers. One for base raster (brown pixels) and the other one for overlapped raster (pink pixels) after use mask tool.

I guess I may use raster calculation tool to get the not-overlapped pixels as an image, but I do not know how to do that.

In order to get not-overlapped image, I do not know which one will be better and faster between (one raster with polygon) and (two rasters).

Thank you,

Sun

Re: How to perform reverse clip?

PetePedrazzini — Wed, 15 Feb 2017 17:00:41 GMT

You have Advanced license and Spatial Analyst? I think you can use "Erase" tool to accomplish that

Erase Tool

Re: How to perform reverse clip?

SamuelBortz — Wed, 15 Feb 2017 17:14:06 GMT

As Ivan noted above, if you have SA enabled a couple of the "Extract by...." tools might be of use. It could be as easy as a selection/switch selection on your polygon layer and then feed that into the appropriate "Extract by...." tool.

Re: How to perform reverse clip?

GwanSeonKim — Wed, 15 Feb 2017 17:16:22 GMT

Thanks for your comments.

I already tried to use the Erase tool, but I cannot use the raster into either input features or Erase features.

I guess both input features and erase features allow to use polygon shapefile rather than raster.

Re: How to perform reverse clip?

DarrenWiens2 — Wed, 15 Feb 2017 17:20:37 GMT

You should be able to use a raster calculator expression like:

Con(IsNull("PINK_RASTER"),"BROWN_RASTER")‍

Re: How to perform reverse clip?

SamuelBortz — Wed, 15 Feb 2017 17:26:53 GMT

assuming spatial reference, cell size etc are the same between data sets, correct?

Re: How to perform reverse clip?

GwanSeonKim — Wed, 15 Feb 2017 17:31:37 GMT

Yes, cell sizes are the same between data sets. For the spatial reference, if it means projection, yes, they are same.

Re: How to perform reverse clip?

GwanSeonKim — Wed, 15 Feb 2017 17:32:37 GMT

I am trying to use the code you provided, but it may take time since I am doing entire U.S. I will let you know if it works or not. Thank you.

Re: How to perform reverse clip?

DarrenWiens2 — Wed, 15 Feb 2017 17:34:16 GMT

Sure, those are good rules of thumb for any project.

Re: How to perform reverse clip?

GwanSeonKim — Wed, 15 Feb 2017 18:14:40 GMT

Unfortunately, I got an error as below:

ERROR 000539: Error running expression: rcexec()
Traceback (most recent call last):
File "<expression>", line 1, in <module>
File "<string>", line 8, in rcexec
RuntimeError: ERROR 010240: Could not save raster dataset

In each raster, I have only one value (value=1) with count.

I do not know whether the error comes from this or not.

Do you have any idea why I got this error?

Re: How to perform reverse clip?

AbdullahAnter — Wed, 15 Feb 2017 18:21:47 GMT

what about overlap area if you remove it from raster?

will it be with no data?

or you will select one raster to fill that area?

if so

Use mosaic to new raster tool Mosaic To New Raster—Help | ArcGIS Desktop .

Re: How to perform reverse clip?

GwanSeonKim — Wed, 15 Feb 2017 18:27:41 GMT

Dear Darren,

I just want to let you know that your code is working good.

I do not know why I had error before.

I just changed output raster directory rather than default, it works perfectly.

Thanks for your code.

P.S Do you know why I had the error if I used "default directory"?

Re: How to perform reverse clip?

DarrenWiens2 — Wed, 15 Feb 2017 18:35:07 GMT

Glad to hear it. No, I don't know why you got that error. It looks like others who had the same error fixed it by saving to a different location (like you), or to a different file format, or setting the workspace environment, or other environments, etc. It looks like one of those errors that can be caused by many things, or nothing at all!

Re: How to perform reverse clip?

PetePedrazzini — Wed, 15 Feb 2017 18:41:04 GMT

I'm sorry, I didn't noticed you talking about rasters

Re: How to perform reverse clip?

GwanSeonKim — Wed, 15 Feb 2017 18:55:30 GMT

Thanks for your response.

Maybe I did not explicitly explain my problem

Re: How to perform reverse clip?

GwanSeonKim — Wed, 15 Feb 2017 18:56:08 GMT

Thanks for your response.

I will try if it also works for me or not.

Re: How to perform reverse clip?

JayantaPoddar — Wed, 15 Feb 2017 19:35:40 GMT

If I have to suggest another workaround, then it would be as follows

1. Create a new polygon feature class (Envelope_Polygon) and draw polygon that covers the whole Raster data.

2. Using Erase Tool with Pink_Polygon, get the non-overlapping portion of the Envelope Polygon.

3. Clip (Data Management) the Raster with the remaining portion of the Envelope Polygon.

Re: How to perform reverse clip?

MichelleTotman — Thu, 16 Feb 2017 20:32:09 GMT

This is my go-to answer for this particular problem.