topic Re: Stat summary for Jurisdictional Boundary in Spatial Statistics Questions

Stat summary for Jurisdictional Boundary

tA — Mon, 31 Mar 2014 21:46:36 GMT

Hello,

I am trying to find a tool that will give me a summary of how much land(acres) over 30% slope lies within each polygon (forests). I have a forests polygon layer and a slope raster layer. This seems like a very easy concept, yet I am struggling to find a tool that works.
Thanks your time and help!

TA

Re: Stat summary for Jurisdictional Boundary

ShaunWalbridge — Tue, 01 Apr 2014 00:02:49 GMT

TA,

First, create a raster which classifies your raster into a binary '>30%' or '<=30%' grid. You can use, for example, the raster calculator to compute this. Once you have that in hand, the operation you're looking for is called zonal statistics: you want to get sums based on the polygons you have. You should be able to use the Zonal Statistics as Table tool for that step.

chers,
Shaun

Re: Stat summary for Jurisdictional Boundary

tA — Tue, 01 Apr 2014 15:55:41 GMT

Have you ever tried the isectpolyrst tool in the GME toolkit. I keep getting errors...

Re: Stat summary for Jurisdictional Boundary

ShaunWalbridge — Tue, 01 Apr 2014 20:35:26 GMT

umgrad,

I haven't used it recently, but unless you need the specific behavior GME provides, the approach I mentioned above should do what you're asking for. If you're getting errors with GME specifically, you'll probably have to contact its author for help, I'm not sure if there is a public forum for support specifically for GME.

cheers,
Shaun

Re: Stat summary for Jurisdictional Boundary

tA — Tue, 06 May 2014 19:01:49 GMT

Shaun,
I am wondering if the "sum" in the zonal stats as table tool will give me the total area in acres of the specific polygon I am interested in?
Thanks