topic Re: Correlation between two raster files - Correlation grid output? in ArcGIS Spatial Analyst Questions

Correlation between two raster files - Correlation grid output?

SethAdams — Mon, 28 Mar 2011 22:58:49 GMT

Hi all,

I have a question about calculating the correlation between two grids. I am aware how to get a single correltation value as an overall correltaion value, but is there a way to produce a resulting grid with a correlation value for each cell?

I would like to have a visual aid for the correlation between the two variables over the entire study site ultimately. I know the two attributes are closely correlated (using Spearman correlation), I just want to see over which areas the correlations are highest.

Thanks for any help,

Seth

Re: Correlation between two raster files - Correlation grid output?

SethAdams — Tue, 29 Mar 2011 19:20:41 GMT

Thank you Bill! That is what I was referring to, I just could not think of the name or where I had seen something similar.

I will try out your suggestion and see what I can come up with!

Thanks for the help again,

Seth

Re: Correlation between two raster files - Correlation grid output?

SethAdams — Tue, 29 Mar 2011 20:50:13 GMT

Alright Bill, I ended up using your explanation found here:
http://forums.esri.com/thread.asp?c=93&f=1740&t=288054

It worked wonderfully, but when I received the output correlation grid, it had a high of 81 and a low of -81. I know I saw another member on the forum have a similar situation arise and I can't quite seem to find the thread that the solution to their problem was located. Can you help? I'll keep searching though in the meantime.

Thanks again,
Seth