Need to merge two 3D surfaces so that I can create contour isolines

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01-04-2015 06:15 PM
JonBeets1
New Contributor

I have two 3D surfaces that heavily overlap. For those of you familiar with airport imaginary surfaces these are imaginary surfaces for two runways that are near each other so the imaginary surfaces for each overlap.  I need to merge them together keeping only the lowest surfaces of the two into the new surface. From there I plan on generating isolines of the new surface that can be used on a 2D map.  I cannot figure out how to merge these two surfaces together in this way.   Attached video are the surfaces together.

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MikeCusi
Occasional Contributor II

What do you mean with manual work? A raster calculator equation that reads, compares raster1 and raster2 then outputs the lowest value would be all that you need to generate the source for the contours.

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MikeCusi
Occasional Contributor II

Have you tried converting them to rasters? (don't forget to use snap rasters). Then you can maybe use the raster calculator (or a progressive combination of some other tools)  to compare the two rasters to generate a new raster map with the values you want. Then it's just a matter of extracting the contours from the output raster.

JonBeets1
New Contributor

I looked at that but didn't see anyway to make it do specifically what I wanted. It seemed like it would still require a lot of manual work thus opening the door to errors....

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MikeCusi
Occasional Contributor II

What do you mean with manual work? A raster calculator equation that reads, compares raster1 and raster2 then outputs the lowest value would be all that you need to generate the source for the contours.

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JonBeets1
New Contributor

Thanks for your help.. The Raster Calculator did solve my problem as I was able to combine the two surfaces into one.   I still need to figure out how to get the calculator to include the areas of the raster that do not have another raster above or below it but I will work on that later.  For this project I was able to just clip those remaining raster areas into the file the raster calculator created and I then had a solid final product.


Thank you again.....

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Matthew_Brice
New Contributor II

I am trying duplicate this effort. I have created the Imaginary Surfaces in 3D but now need to create the contours. I have tried using the Surface Contour tool but I can not get the lines to match up. Please let me know any tips that you may have.

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Matthew_Brice
New Contributor II

How did you create the isolines for the imaginary surfaces

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JonBeets1
New Contributor

Hello,

I didn't do isolines, I did 90x90 ft polygon grids off of the raster with the elevation value from the cell data.   However isolines should work just fine.  If you are creating the isolines from more than one raster you will need to ensure that the data is the same format in them.  

Jon 

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