I did some more testing.
Set up #1:
Using the custom basemap in the local county coordinate system, then publishing the hosted feature service in that same local county coordinate system. The GNSS input is always NAD 1983 (2011).
Transformation is NAD_1983_HARN_To_NAD_1983_2011 in Esri Field Maps.
Set up #2:
Data, custom basemap, and GNSS output is all in NAD 1983 (2011).
No transformation is occurring in field maps, but then post-processing of the data occurs by projecting the data to the local county coordinate system in ArcGIS Pro.
I tested on two devices with varying accuracy levels. One was an Eos Arrow Gold CM Receiver. I actually ended up having more accurate results with the Set Up #1 with the hosted feature service being in the local county coordinate system than it being in NAD 1983 (2011) for Z values. X and Y were pretty comparable. With this data in the local county coordinate system already, it seems to make more sense to stick with set up #1 since I do not need to post-process.
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Anna Peters
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Original Message:
Sent: 04-04-2024 12:15
From: Joel Cusick
Subject: Coordinate System for Data Collection
Anna,
You are correct with the Trimble blog post. It is not entirely clear on the location profile screenshot in the post why you would use this: see below. In one, and only one workflow would this make sense, and ONLY in Field Maps that, in the case of using TMM, you keep MOCK location OFF on android. In this case, with incoming GNSS stream based on NAD83(2011), with NAD83(2011) with hosted feature layers in NAD83 (2011) and a ESRI basemap (PCS - Web Mercator) will this work. YOU DO NOT HAVE TO transform a basemap to match the incoming datum of the augmentation, in FIELD MAPS. The only way to know Anna is to occupy survey control (a modern OPUS share would be ideal). The sheer number of datum hoops will drive you nuts. I'm emphasizing Field Maps in this post, because currently in QuickCapture and Survey 123, where you have to activate MOCK location in TMM, you cannot hit NAD83(2011) survey control with a, say, NTRIP augmentation fed into either software based on NAD83(2011). Its kinda nuts that this is occurring across the FM vs QC/Survey123 mobile platforms, but that is the case. Love to have someone prove me wrong. I'm about to contact the team at ESRI. Its not an issue with TMM, but QuickCapture and Survey123.
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Joel Cusick
Original Message:
Sent: 04-04-2024 08:59
From: Anna Peters
Subject: Coordinate System for Data Collection
Hi Mark,
Thanks for sharing. I read through and it is a helpful article, except doesn't quite answer my question. It talks about the coordinate system of the basemap and web map but not of the hosted feature service data being added into the web map. I think I found the answer in the blog post below. The data should be in the same geographic coordinate system as the GNSS coordinate system. This can be done in conjunction with the Esri basemapping or to create custom basemaps in the same geographic coordinate system as the GNSS corrections.
High-accuracy mobile data collection in NAD83 CSRS
| Esri | remove preview |
 | | High-accuracy mobile data collection in NAD83 CSRS | | Tips & tricks for setting up ArcGIS Field Maps for collecting data in NAD83 CSRS when in the field. | | View this on Esri > |
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Anna Peters
Original Message:
Sent: 04-03-2024 18:31
From: Mark Kellaway
Subject: Coordinate System for Data Collection
Hi Anna,
Take a look at this blog published last year on exactly this topic, hopefully it helps!
Best regards,
Mark.
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Mark Kellaway
Original Message:
Sent: 04-03-2024 07:24
From: Anna Peters
Subject: Coordinate System for Data Collection
Hello,
I am working with the Trimble DA2 and Esri Field Maps. When I create my data in ArcGIS Pro and upload it to ArcGIS Online, should the hosted feature service coordinate system should match whatever the GNSS output coordinate system is, for example, NAD 1983 (2011) with RTX? Then if a transormation is needed between that data and the basemap I use, that is completed through the location profile? Thanks!