topic Re: creating a layer consisting of modal values from 3 interpolated layers in ArcGIS Spatial Analyst Questions

creating a layer consisting of modal values from 3 interpolated layers

AndrewCalhoun — Tue, 28 Feb 2012 18:54:28 GMT

Hi,

I am working on creating a map of sediment distribution according to size. I have 3 IDW layers created for 3 different size classes (gravel, sand, & silt). Each layer displays the said size as percentages across the study site. My plan is to place a grid over theses layers and create a new layer based on the highest percent sediment size in each square on the grid based off of the aforementioned idw layers. That is each square would show the sediment class of highest precentage for that area, wether it be gravel, sand, or silt. I know how to produce the grid, but as to the rest I am not knowledgable of. If any can help I would greatly appreciate it.

Andrew

Re: creating a layer consisting of modal values from 3 interpolated layers

EricRice — Tue, 28 Feb 2012 19:59:12 GMT

Hi Andrew,

There are details missing from your desription that I would need to know to answer definitively, but I can point you in the right direction for now.

See: Cell Statistics Use the Max option.

Or

You may need to perform Zonal Statistics with Max option (run it 3 times), then Cell Statistics. A lot depends on what you want as output.

You might also take a look at the Highest Position tool. It won't return the highest pixel value like my other suggestions, but it will tell you which of the 3 IDW layers actually had the highest (Max) value based on order of input.

Regards,
Eric

Re: creating a layer consisting of modal values from 3 interpolated layers

AndrewCalhoun — Wed, 29 Feb 2012 16:46:50 GMT

eric,

thanks for the help. i was able to use cell statistics to pull out the maximun pixel value for the 3 layers, and it produced what i was expecting.