topic Re: Need help with idw in ArcGIS Spatial Analyst Questions

Need help with idw

Sheikhkenneh — Tue, 22 Jun 2021 20:22:38 GMT

Need assistance with this question I was given

Re: Need help with idw

DavidPike — Tue, 22 Jun 2021 20:52:54 GMT

the question is asking for the raster value at the intersection of 4 raster cells? Not your fault at all, but that confuses me no end.

Re: Need help with idw

Sheikhkenneh — Tue, 22 Jun 2021 22:49:29 GMT

I believe so. I have no idea what points to use or how to find the distance with the things given .

Re: Need help with idw

DavidPike — Tue, 22 Jun 2021 23:07:04 GMT

I think @DanPatterson can offer some academic input on this one.

Re: Need help with idw

DanPatterson — Tue, 22 Jun 2021 23:21:26 GMT

That is merely a cartesian plot of the points, not raster cells.

The x and y axis show spacings of 1 unit for distance, so for a horizontal or vertical movement you are moving 1 distance unit. a diagonal movement would represent sqrt(2) (pythagorean theorem).

You must decide which points to include given that the distance values must be <= 2.

Pick the points to include and use the equation to sum the distance values etc...

Since it is a problem presumably for a course, I will leave the solution to you... make sure you show your work.

Re: Need help with idw

SteveLynch — Wed, 23 Jun 2021 14:19:28 GMT

Interactive Geostatistical Wizard is also a great teaching tool. I've hidden the answer as this is an assignment 😀

Re: Need help with idw

Sheikhkenneh — Wed, 23 Jun 2021 16:41:00 GMT

did I do this correctly?

Re: Need help with idw

DanPatterson — Wed, 23 Jun 2021 19:31:28 GMT

Sorry... I stopped grading assignments when I retired 😉