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How SHOULD I manage a Field Map when dealing with WGS84 and TA83 data?

SH110123

I'm trying to create a map in ArcGIS Pro with a mix of WGS84 and TA83 data.

When I try to publish it into a webmap, Pro doesn't like that - not to mention, Field Maps defaults to WGS84(?).

A key piece of data I'm working with are buffers, ranging from 0.5 miles to 5 miles.

I understand calculating in PLANAR with TA83 would be ideal, but if the end product is WGS84, would calculating in GEODESIC with WGS84 make the most sense?

Please help, thank you!

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JonathanLebowitz

The Measure tool in Field Maps performs the same distance calculation as the Measure tool in Map Viewer; per Measure distance or area—ArcGIS Online Help, "Map Viewer calculates the shortest measurement (using the ellipsoid-based geodesic calculation) even if the data uses a projected coordinate system." Your buffers, if they are in PCS NAD 1983 California (Teale) Albers, will be re-projected on-the-fly to PCS WGS 1984 Web Mercator and the distances generated by the Measure tool will be geodesic on the WGS 84 ellipsoid. If you want to calculate planar distances in NAD 1983 California (Teale) Albers, you will need to use the Measure tool in ArcGIS Pro (map coordinate system will need to be set to NAD 1983 California (Teale) Albers).

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JonathanLebowitz

Hi @SH110123 By TA83 are you referring to NAD 1983 California (Teale) Albers?

SH110123

Hi Jonathan,

That is correct.

Just having a hard time how to manage my data…

JonathanLebowitz

@SH110123 If you use an Esri basemap in the Field Maps map, the map coordinate system will be WGS 1984 Web Mercator/WKID 3857. Any layers in NAD 1983 California (Teale) Albers would be re-projected on-the-fly for display, but the geometry of the features will still be in NAD 1983 California (Teale) Albers Meters/Intl Feet/US Feet. The only way to have a map in NAD 1983 California (Teale) Albers would be to create your own custom basemap in NAD 1983 California (Teale) Albers and use it as the basemap in the Field Maps map. As far as creating buffers, if you use the Buffer tool in ArcGIS Pro, you can compute them based on either planar or geodesic distances.

SH110123

Any layers in NAD 1983 California (Teale) Albers would be re-projected on-the-fly for display, but the geometry of the features will still be in NAD 1983 California (Teale) Albers Meters/Intl Feet/US Feet.

How would I fix the geometry to reflect properly in Field Maps if my intention is to keep the ESRI basemaps (therefore keeping WGS 1984)?
Same question applies for the buffer question. If my end goal is to stay in field maps, should I just be using the project tool on NAD TA83 CA data into WGS?

SH110123

@JonathanLebowitz
I think I get what you're saying.
I think my issue when working with a mix of data, then viewing them on Field Maps, and say, using the measuring tool to double check my planar buffers for non-WGS 84, it's completely off. And from what I've learned, it's because Field Maps is strictly WGS 84.

Should I be recalculating my geometry or something so that my planar, non-WGS 84 buffers still display the correct values while being projected appropriately?

JonathanLebowitz

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