Contours for Approach Surfaces

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05-18-2023 07:42 AM
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JasonWeis_Westwood
New Contributor II

When creating the "Airport Airspace Drawing(s)" for an Airport Layout Plan (ALP), 50-ft contours must be shown for all sloping Part 77 surfaces. Is there a way to generate contours for a multipatch object?  Specifically, one or more of the surfaces generated and saved in ObstructionIdSurface_MP?  I have not been able to find a good way to generate contours for these approach surfaces, either inside of Airports or with ArcGIS Pro in general.

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DavidWickliffe
Esri Contributor

Hi Jason,

  The way it has been done by some Esri Aviation users is to use :

  1. Multipatch to Raster  
  2. Contour (Spatial Analyst) 

https://pro.arcgis.com/en/pro-app/latest/tool-reference/conversion/multipatch-to-raster.htm

https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/contour.htm

DavidWickliffe_0-1684442149813.png

BTW,  you can create OIS features in a polygon feature class (often used for display), but you should use Multipatch feature classes (ObstructionIdSurface_MP) for any Airports Analysis tools like Analyze Runway Obstacles, since the MP features are more accurate for analysis. 

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EDUARDOARDILARINCON
New Contributor III

Instead of generating the surfaces in a multipatch feature, have you tried generating them in a 3D polygon feature? 
With this kind of feature you can run the “create TIN” and then “TIN contour” to generate contours in your preferred interval.

I don’t know if it’s the best workaround but hope it helps.

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JasonWeis_Westwood
New Contributor II

I was not aware that a 3D polygon feature class was an allowable target for the approach surface - I assumed it needed to be the MP format that was included in the -18B geodatabase (and most tutorials). After reading your response, I checked the Help, and a 3D polygon is indeed allowed!  I ran a quick test, and it looks like it might work.

I might still use the MP feature class for the official source of the other OIS analyses, but a duplicate 3D polygon surface could be useful for generating contours.  Thanks for the suggestion!

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DavidWickliffe
Esri Contributor

Hi Jason,

  The way it has been done by some Esri Aviation users is to use :

  1. Multipatch to Raster  
  2. Contour (Spatial Analyst) 

https://pro.arcgis.com/en/pro-app/latest/tool-reference/conversion/multipatch-to-raster.htm

https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/contour.htm

DavidWickliffe_0-1684442149813.png

BTW,  you can create OIS features in a polygon feature class (often used for display), but you should use Multipatch feature classes (ObstructionIdSurface_MP) for any Airports Analysis tools like Analyze Runway Obstacles, since the MP features are more accurate for analysis.