Verifying Control Points with ESRI

Verifying Control Points with ESRI


Verifying Control Points with ESRI’s Field Maps (Arc Pro)



This document will outline the process required to configure and test the accuracy of your GNSS receiver within your ESRI’s Field Maps environment. This workflow will require that you have access to ESRI’s ArcGIS Pro software. 


  1. To begin we will want to identify a local geodetic land monument for us to test and compare our GNSS shots with. 

  1. www.ngs.noaa.gov/opusmap/ - This OPUS map contains thousands of these monuments all around the country. Zoom into your local metro area and try to find one you will be able to physically travel to for testing.

  1. I will be using the DP2400 PID for this example

A screenshot of a mapDescription automatically generated

  1. Select the blue Shared Solution button to open an informational page outlining its precise coordinate location of the monument.
A close up of a ballDescription automatically generated
  1. Outlined in a blue highlight is the State Plane Coordinate in Northing and Eastings. This specific coordinate system is 2203 Minnesota South.

A number of numbers and a few metersDescription automatically generated with medium confidence


  1. In ESRIs ArcPro, create a new geodatabase and a single feature within it. We can call it ControlPoint. Be sure when creating the geodatabase that you specify that you want it in whatever coordinate system the control point you are referencing is in. In my case it is the Minnesota South State Plane Coordinate. This is a very important step.


A close-up of a computer screenDescription automatically generated


  1. Go into the Edit ribbon in ArcPro and select the Create button. 


A screen shot of a computerDescription automatically generated


  1. Right Click anywhere on the map and select ‘Absolute X, Y, Z’. 


A screenshot of a computerDescription automatically generated


A number of numbers and a few metersDescription automatically generated with medium confidence


  1. Here we will enter the northings (331,993.783m) into the Y box and then we will enter in the easting (845696.220m) into the X box. Remember to look at the column that specifies the SPC (State Plane Coordinate) system in the Share Solution NGS page. This will be different depending on the location of the monument. 

  1. Hit the green checkmark at the bottom of your map to finalize the point. Be sure to save your work in the Edit ribbon. 
​



  1. You will now want to reproject the coordinate system into WGS1984 so it matches up with ArcGIS Online and Field Maps, which always use WGS1984 Web Mercator Auxiliary Sphere as its coordinate system. Note, if you are using an enterprise system for Field Maps this might not be the case as you can use alternate coordinate systems for your basemaps. 


  1. Go to the View ribbon in ArcPro and select Geoprocessing. 


  1. In the Geoprocessing column, search for the tool Project and select it. Choose the ControlPoint as your input feature and select your Output Coordinate System as GCS_WGS_1984. Hit run.


A screenshot of a computerDescription automatically generated


  1. Right Click the newly created feature from the projection tool. Mine was called ControlPoint_Project. Choose Share and then Share as a Weblayer to bring it into ArcGIS Online. Once it is online you can bring it into a Web Map to be used in the Field Maps app.


  1. Once you have it in a web map you can compare your accuracy with the point you have created. If it lines up with where your GNSS antenna is setting you at in Field Maps then you have a properly configured receiver.