I am trying to set up a computational grid using Constant Spaced Grid. I have my coordinate system set up to Geographical coordinates NAD1983 and my DEM and raster images are in the same coordinate system. When I try to set the X Y orgin it shows an ∞ for the coordinates and does not allow me to pick the correct location. I tried manually typing in an X and Y but it did not like this either.
Hello Adam,
Typically, when you open an empty Map and add your XYZ layer, you need to select the projection of your XYZ data. In your case, when you add the XYZ layer this dialog will appear and you'll have to choose in the Projection options: Type -> Geographic; Major -> North America; Minor -> NorthAmericanDatum1983.
If your file does not contain any information about the projection, the default projection type will be None and you have to manually set it to NAD1983 has mentioned above. Alternatively, you can embed the coordinate system by writing a proj4 string in the XYZ file:
PROJ4_STRING : +proj=longlat +datum=NAD83 +no_defs
In this case, when you add the XYZ layer the Projection options will be set automatically and just press OK to load the layer in the Map.
If you have followed this steps and the problem persists, then I would kindly ask if you please upload your XYZ file in Geographical coordinates NAD1983 so I can try to reproduce the problem?
You can follow these instructions to upload the file.
Thanks and regards,
Luis Fernandes
Hi Luis,
Thank you for your response. I tried following the steps above with a few different .xyz files and the appear to come in at the right spatial location, however I get the same issue when trying to create the computation grid. I had issues uploading the WillCounty.zip file here but have sent it through the secure file transfer page.
Thank you,
Adam
Hi Adam,
I took a look at the XYZ file you've uploaded, and I would like to confirm the coordinate system the data is in.
You mentioned that it's in geographical coordinates NAD1983, but if you take a look at the first valid point in the file the coordinates look projected:
X =1029630.0292481
Y = 1736810.71921443
Z = 506.002868652344
Did you mean UTM NAD1983? If that is the case, could you provide the corresponding zone? I've tried with zone 16 but could not get the data loaded corrected with a Bing map on the background and reproduce the screenshot you've sent.
Thanks and regards,Luis
Thanks for your reply. I think the issue may be that I also used a vertical Z projection when I created in ArcGIS Pro:
I wonder if I need to use a Proj4 string which also specifies the Z coordinate system? I did use geographic state plane coordinates for the XY.
Thanks,
I was able to get it to work by re-pulling in the file and using the custom proj4 string: +x_0=984250 +y_0=0 +k_0=0.999975 +lat_0=36.666666666666657 +lon_0=-88.333333333333329 +proj=tmerc +datum=NAD83 +no_defs
Thank you for your help!