topic Re: Observer Points 3D Function/ Visibility Functions in Python Questions

Observer Points 3D Function/ Visibility Functions

AnjeliDubey — Mon, 04 Dec 2023 19:15:41 GMT

H! I was looking at the ESRI documentation for the Observer Points 3d function:

https://pro.arcgis.com/en/pro-app/latest/tool-reference/3d-analyst/observer-points.htm

I found that these below are the default settings for Visibility Analysis for this function, as well as the Viewshed function:

How do I use the python function to change these default settings? The only parameters I can find for the Observer Points 3d that can be altered are the z-factor, curvature correction, and refractivity coefficient. I even used the calculate field functions to change the attribute table of the input feature class, but it did not change the default settings of the function.

arcpy.CalculateField_management(inputfeatureclass, "RADIUS2", radius2distance, "PYTHON_9.3", "")

Thanks!

Re: Observer Points 3D Function/ Visibility Functions

DavidPike — Mon, 04 Dec 2023 19:23:15 GMT

If you've got a numeric field called RADIUS2 populated with the values you need, then it should work. My guess is you've got your dataframe or data in a geographic coordinate system rather than projected, but without seeing your data or outputs that's just an educated guess.

Re: Observer Points 3D Function/ Visibility Functions

AnjeliDubey — Mon, 04 Dec 2023 20:49:32 GMT

My data is in a projected coordinate system, and this is what I changed the default settings to for 3 of the options above using CalculateField().

This is what the attribute table looks like for the output. Range and ObserverHgt are aliases for RADIUS2 and OFFSET A, respectively.

However, no matter what value I change these options to, it always returns the same viewshed, as if the values in the attribute table did not affect the output of the function ObserverPoints at all.

Re: Observer Points 3D Function/ Visibility Functions

DavidPike — Mon, 04 Dec 2023 21:13:47 GMT

you have negative values for RADIUS2? I don't understand. Aside from that it might be worth changing your aliases to radius2 etc. I have a distant memory of having something similar before.