topic Re: Setting Minimum and Maximum Values in a Raster in 3D Questions

Setting Minimum and Maximum Values in a Raster

MattPowell — Thu, 30 Sep 2010 10:22:11 GMT

I want to be able to minus a value from a raster (using Raster Math) but to not go below a certain value. For example: I have a raster ranging from 0.2 to 8 and I want to minus 1, but for the values that would be -0.8 to become 0.

I have tried using the Output Z domains in the Environment Settings of raster Math, but to no avail.

Any suggestions?

Regards

Matt

Re: Setting Minimum and Maximum Values in a Raster

EricRice — Tue, 05 Oct 2010 19:23:52 GMT

Matt,

One way to get the answer is to do the subtraction like you normall would. Then use a Con statement to say anything below your threshold should be equal to the threshold; if it's above the threshold, keep the value as-is. In your example the threshold is 0. Would this work for you?

Eric

Re: Setting Minimum and Maximum Values in a Raster

DonovanCameron — Tue, 05 Oct 2010 20:18:33 GMT

Matt,

One way to get the answer is to do the subtraction like you normall would. Then use a Con statement to say anything below your threshold should be equal to the threshold; if it's above the threshold, keep the value as-is. In your example the threshold is 0. Would this work for you?

Eric

Output = Con(Input, 0, Input, "Value < 0")

Re: Setting Minimum and Maximum Values in a Raster

MattPowell — Wed, 06 Oct 2010 09:59:06 GMT

Thanks guys, I'll give this a go.