Configuring the correct GNSS Receiver Coordinate System In ESRI Collector

Document created by Tom Harrison on Dec 8, 2017Last modified by Tom Harrison on Dec 13, 2017
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Trimble Mobile Manager v1.2.155 introduces the ability for users to output positions in either a local or a global reference frame.

In Trimble Mobile manager (TMM) this is known as the Target Reference Frame (TRF)

The Target Reference Frame enables you to define a consistent coordinate output regardless of the correction source in use and to also compensate for datum/epoch shift errors.

The Trimble Mobile Manager Quick Start Guide provides more information on this - please refer to Set a Target Reference Frame and Target Reference Frame behaviour.

 

In ESRI Collector you will need to create a Location Profile and match the GNSS Receiver Coordinate System with the Target Reference Frame setting in TMM.

 

 

Configuring a Target Reference Frame in Trimble Mobile Manager

 

  1. Select the More menu, then tap Settings 
  2. Select the Target reference frame menu and choose from one of the 3 options:
    • Same as Source  (Transformation Off) - Trimble Mobile Manager passes through positions as received by the receiver (whether they are corrected or not). Practically this means ITRF2014(Current - WGS84 equivalent) or whatever your local NTRIP source is using if you are using a local base
    • Auto select - Trimble Mobile Manager queries the current position to look up the reference frame you are most likely in based on internal polygons of known frames 
    • Select from list - Select your reference frame from the support datum's provided. Refer to Supported Geodetic Datum's in Trimble Mobile Manager for the full list
  3. Select OK
  4. Select the 'back icon' when you are done, to return to the Trimble Mobile Manager Home screen

 

As an Example; If you are working in the European Region and enable Auto selection TMM will choose the appropriate Datum for your location 

 

Select the Settings optionSet Target Reference Frame to Auto SelectionSelect Ok to apply Target Reference FrameConnect to Catalyst & observe the GNSS output Target Reference Frame

 

Note - The Target reference frame setting in TMM also sets the output EPSG code, which can be queried and used as position meta-data for other Catalyst-enabled applications utilising Trimble Mobile Manager. For more information on EPSG codes and their use, refer to the official website http://www.epsg.org/.

 

Configuring Location Profile In ESRI Collector  

 

In ESRI Collector you will need to create a Location Profile and match the GNSS Receiver Coordinate System with the Target Reference Frame setting in TMM

  1. Ensure Catalyst is disconnected in Trimble Mobile Manager (or any other Catalyst enabled apps) so ESRI Collector can connect
  2. Start ESRI Collector and Sign In
  3. In the Map Overview Window select the overflow option and Settings

  4. Under the Location section, select Location profile and Add profile 
      

  5. First you must define the GNSS Receiver Coordinate System - this is the TRF define earlier in TMM
  6. Type in the EPSG or name of the Target Reference Frame defined in TMM
  7. Select the appropriate GCS from the list - for example 4258 is the EPSG for GCS ETRS 1989
    Please refer to the ESRI GNSS Receiver Coordinate System Lookup Table below which provides the current EPSG codes output by Trimble Mobile Manager and the GCS equivalent in ESRI Collector - for all supported Datum's please refer to the Supported Geodetic Datum's in Trimble Mobile Manager document
     
  8. Define the Map Coordinate System (this is the coordinate system your basemap is using) - For example ArcGIS Online uses the WGS84 Web Meractor Auxillary projection
  9. Select the Datum Transformation between your GNSS Receiver Coordinate system and the map coordinate system
    Note collector does not support Grid Transformations currently
  10. Save and name the profile
  11. Select to use

For simplicity we recommend Selecting the WGS84(G1762) current option from the list in TMM and setting GCS WGS 1984(4326) In ESRI Collector. This requires no Datum transformation so will enable you to transform this back in ArcGIS If your Datum Transform Is not supported in Collector

 

ESRI GNSS Receiver Coordinate System** Lookup Table

Correction source setting in TMM

Correction Type

TCH Datum Correction Source

EPSG code

ESRI GNSS Receiver Coordinate System

Trimble Corrections Hub

Autonomous

ITRF2014 (Current Epoch)*

N/A

GCS WGS 1984 (EPSG 4326)

SBAS

ITRF2014 (Current Epoch)*

1165

GCS WGS 1984 (EPSG 4326)

RTX (IP or L-Band)

ITRF2014 (Current Epoch)*

1165

GCS WGS 1984 (EPSG 4326)

VRSNow.EU

ETRF2000(R05)

1186

GCS ETRS 1989 (EPSG 4258)

VRSNow.US

NAD83(2011)

1116

GCS NAD 1983 2011 (EPSG 6318)

NAD83 PA11

1117

GCS NAD 1983 PA11 (EPSG 6322)

NAD83 MA11

1118

GCS NAD 1983 MA11 (EPSG 6325)

NAD83 CSRS

6140

GCS North America 1983 CSRS (EPSG 4617)

VRSNow.COM.AU

GDA94

6283

GCS GDA 1994 (EPSG 4283)

Advanced (User-configured local source)

Local NTRIP

Defined by user in GNSS Source Reference Frame

Defined by user

Defined by user

*  ESRI Collector does not yet support  ITRF2014(current) so this is the best approximation.

** Trimble Mobile Manager does not apply a deformation models for the associated datum. In this case you should use the Same as source (Transformation off) option and apply the correct transformations independently (In your desktop software for example), or perform a site calibration using a 3rd party application to adjust for localised differences.

 

Why Is there a difference In EPSG Codes?

TMM displays the EPSG based on type = Geodetic Datum, while ESRI Collector displays are based on type = Geodetic CRS (geographic 2D)
For more information on EPSG codes and their use, refer to the official website http://www.epsg.org/.

 

 

General best Practice

 

If the user has "No transformation" set in TMM:

  • Set the GCS that best matches the Trimble Correction Hub (TCH) Datum Correction Source
  • For Local NTRIP corrections, you should choose a datum that best matches the correction datum of your local NTRIP network. This should be known by the local network administrators.

 

If the user chooses Auto selection:

  • Auto selection queries your current position and looks up the most likely reference frame (and epoch) for your location based on internal polygons of known frames.
    • The Reference Frame is then displayed in "GNSS Status > Output reference frame" field in TMM
    • In ESRI Collector you should choose the closest GCS based on what is displayed in the TMM Output Reference Frame field
    • This is recommended if you are unsure what you should use,
    • For example in Europe this would revert to ETRF2000(R05), the US NAD83(2011), In Australia GDA94
  • For Local NTRIP corrections, you should choose a datum that best matches the correction datum of your local NTRIP network. This should be known by the local network administrators.

If the user chooses Select from list:

  • Set the GCS that best matches the TCH Datum Correction Source you have selected from the list
    • The table in Supported Geodetic Datum's in Trimble Mobile Manager  covers all the supported Reference Frames along with the EPSG Code
    • TMM displays EPSG codes based on Geodetic Datums, while ESRI Collector displays are based on Geodetic CRS (geographic 2D)
    • You can search by EPSG in ESRI Collector and use the official website http://www.epsg.org to find the equivalent or best approximation to set up in ESRI Collector
  • For Local NTRIP corrections, you should choose a datum that best matches the correction datum of your local NTRIP network. This should be known by the local network administrators.

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