# Need help with idw

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06-22-2021 01:22 PM
New Contributor

Need assistance with this question I was given

7 Replies
MVP Frequent Contributor

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.

New Contributor

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

MVP Frequent Contributor

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

MVP Honored Contributor

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.

... sort of retired...
Esri Regular Contributor

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

New Contributor

did I do this correctly?

MVP Honored Contributor

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

... sort of retired...