topic HELP! can anyone tell me how to solve 'edge effects'? in ArcGIS Spatial Analyst Questions

HELP! can anyone tell me how to solve 'edge effects'?

philcass2 — Tue, 21 Mar 2023 21:40:33 GMT

Hello

I have assigned this raster layer to a constant value of '1'. How can I removed edge effects, i.e. make sure that the areas outside the study area map are not utilised??

Re: HELP! can anyone tell me how to solve 'edge effects'?

DanPatterson — Tue, 21 Mar 2023 22:19:06 GMT

if that is your study area, they won't be used.

If your study area is within that image, clip it as I suggested before (clip analysis for vector, and clip raster for rasters... they are in arctoolbox and in the last links I posted)

Re: HELP! I need to consider 'edge effects' when c... - Esri Community

Re: HELP! can anyone tell me how to solve 'edge effects'?

CodyBenkelman — Tue, 21 Mar 2023 23:19:14 GMT

Phil

there is not enough information in your post to allow us to answer. The raster you show clearly has multiple values in the pixels - do you mean you've remapped the pixel values to 1?

Then can you explain what you're doing with the raster? If your study area is your raster, nothing outside that raster should be contributed to a model or analysis - if that's not currently true, what is currently happening outside the raster extent?

Cody B

Re: HELP! can anyone tell me how to solve 'edge effects'?

philcass2 — Tue, 21 Mar 2023 23:49:45 GMT

Hi Both,

Thank you for you're replies!

It is basically for a lab class where we had to make a tool to assess compactness of urban data in arcmap. We were provided with the urban extent data:

We created a number of layers (easy to do) we then created a tool to assess compactness:

for a follow up exercise he suggested we change the tool so instead of utilising zonal statistics, we created a tool involving focal statistics. He then mentioned the following:

He said this would be challenging and I am struggling with where to start. I contacted the professor to clarify what he meant by the edge effects and he stated this:

Any suggestions of where to start would be super helpful. I am very new to arcmap! I know that Dan sent me some links but being new to arcmap, its hard to understand some of the concepts in laymans terms

Thank you!

Re: HELP! can anyone tell me how to solve 'edge effects'?

philcass2 — Tue, 21 Mar 2023 23:51:15 GMT

Thank you again Dan for your suggestions! I'll have a try now! 🙂