topic Re: Voxel layer doesn't show even though all coordinate systems match in ArcGIS Pro Questions

Voxel layer doesn't show even though all coordinate systems match

zdgra — Mon, 31 Jul 2023 20:03:02 GMT

I created a NetCDF file and then added it as a multidimensional voxel layer to ArcGIS Pro. I then got this warning:

Voxel layer can only be drawn in local scenes with the same coordinate system as the voxel layer. Change the scene to a local scene and the coordinate system of the scene to match the voxel layer.

Looking at the scene's Map Properties > Coordinate Systems, I found that my voxel layer used the WGS 1984 coordinate system while the World Topographic Map and WorldElevation3D/Terrain3D layers used the WGS 1984 Web Mercator (auxiliary sphere) coordinate system.

However, I'm still getting the same warning about the coordinate systems not matching. I've also tried changing the Z coordinate system to both None and WGS 1984, to no effect. I've also restarted ArcGIS Pro, to no effect.

Here's the spatial reference for my voxel layer, in case it helps:

What should I do?

Re: Voxel layer doesn't show even though all coordinate systems match

Andrew--Johnson — Mon, 31 Jul 2023 20:49:52 GMT

Hi,

Which version of ArcGIS Pro are you using? You can reproduce this warning with the following workflow?

1) Click Insert Tab > New Map > New Local Scene

2) Click Map Tab > Click Add Data dropdown > Add Multidimensional Voxel Layer

3) Browse to the netCDF file and click OK

4) The voxel layer is added to the scene

Re: Voxel layer doesn't show even though all coordinate systems match

zdgra — Mon, 31 Jul 2023 23:53:28 GMT

Hi Andrew,

After working on some things, the warning no longer shows up. Now, it's simply that the voxel layer doesn't display at all.

I've checked the data and there is data in the NetCDF file. What do you think is happening? What should I do?

Re: Voxel layer doesn't show even though all coordinate systems match

Andrew--Johnson — Tue, 01 Aug 2023 14:17:16 GMT

Have you tried turning off the basemap and Terrain? It could be beneath the Ground. The other thing to try is to add it as a multidimensional raster to verify that it displays in 2D.

thanks,

Andrew

Re: Voxel layer doesn't show even though all coordinate systems match

zdgra — Tue, 01 Aug 2023 15:00:00 GMT

I did try turning off the basemap and terrain - one at a time and both at the same time. I still cannot see it. I'll try adding it as a multidimensional raster, that's a good idea.

Re: Voxel layer doesn't show even though all coordinate systems match

zdgra — Wed, 02 Aug 2023 19:20:42 GMT

@Andrew--JohnsonHey Andrew, I did try the multidimensional raster approach and got something to display.

Unfortunately I'm still not seeing anything when I add the data as a multidimensional voxel layer.

Re: Voxel layer doesn't show even though all coordinate systems match

Andrew--Johnson — Wed, 02 Aug 2023 21:49:07 GMT

Can you share the netCDF file you are using?

Re: Voxel layer doesn't show even though all coordinate systems match

zdgra — Wed, 02 Aug 2023 23:14:24 GMT

Sure thing. Here it is.

Re: Voxel layer doesn't show even though all coordinate systems match

Andrew--Johnson — Thu, 03 Aug 2023 17:03:52 GMT

@zdgra

I went ahead and took a look and the issue is that the data is irregular so when that's the case we cannot guarantee that it will draw. For these cases we have a python script that will regularize the values for you which you can find here https://pro.arcgis.com/en/pro-app/latest/help/mapping/layer-properties/voxel-layer-freqently-asked-questions.htm#anchor16

I went ahead and ran the netCDF file through the script and have attached the output to this message. The data now displays in ArcGIS Pro.

thanks,

Andrew

Re: Voxel layer doesn't show even though all coordinate systems match

zdgra — Thu, 03 Aug 2023 17:15:15 GMT

Wow! That looks so good. Thank you, Andrew.

See, this is interesting because I, too, saw that FAQ and ran my NetCDF file (a different one than the one I sent you - same data but slightly different parameters) through that same regularization script, but didn't get ArcGIS Pro to display anything.

Here's the output of running my data through that script. When you're able to, could you please look into it and tell me what went wrong for me?

Re: Voxel layer doesn't show even though all coordinate systems match

Andrew--Johnson — Thu, 03 Aug 2023 17:54:36 GMT

From what I can tell is the size of this is a lot smaller than the other dataset and when the dataset gets below 33 x 33 it doesn't render well in a 3D scene. I can have our dev debug but it may take some time to get back to you on this one.

Longitude = 31;
Latitude = 21;
StdPressureLev = 5;

thanks,

Andrew

Re: Voxel layer doesn't show even though all coordinate systems match

zdgra — Thu, 03 Aug 2023 20:01:11 GMT

I see. I had shortened the region because I was worried that too big of one would overload my system. When you say 33x33, are you referring to the longitude and latitude, respectively?

Re: Voxel layer doesn't show even though all coordinate systems match

Andrew--Johnson — Thu, 03 Aug 2023 21:38:35 GMT

Yes, that's correct

Re: Voxel layer doesn't show even though all coordinate systems match

zdgra — Thu, 03 Aug 2023 21:42:30 GMT

Gotcha. I widened my region to be 64x100 and ran it through the regularize_z.py script. This time, however, when I added the output file as a multidimensional voxel layer in ArcGIS Pro, I get the warning

Warning : Dimension 'StdPressureLev' could not be associated with x,y,z or time quantities. Variable(s) using this dimension will be ignored.

And my CO_VMR_A variable isn't shown for selection. What have I done wrong?

The file in the root folder is the original input into the script, and the file in the Regularized folder is the output of the script. I added that file directly into Add Multidimensional Voxel Layer, and got the above error.

Re: Voxel layer doesn't show even though all coordinate systems match

zdgra — Fri, 04 Aug 2023 03:23:11 GMT

@Andrew--JohnsonI was able to get it work. How? I just had to change it from a .nc4 file to a .nc file. Can you believe it?

Re: Voxel layer doesn't show even though all coordinate systems match

Andrew--Johnson — Fri, 04 Aug 2023 13:22:03 GMT

That's good to hear! From my testing, StdPressureLev was missing a required positive attribute so once I added that it drew.

-Andrew

Re: Voxel layer doesn't show even though all coordinate systems match

zdgra — Tue, 08 Aug 2023 01:45:28 GMT

I see now. I had input the wrong file. The file I handled with my own code did have the required 'positive' attribute, while the one I sent you didn't.

I was able to get it working! You've helped me tremendously. Thank you so much, Andrew! It's been a pleasure.