In ArcGIS Pro 2.9 I see multiple realizations of WGS 84 (G172 all the way back to Transit. G2139 hasn't been added yet?).
What is the practical difference between them in ArcGIS Pro 2.9?
Under what circumstances should a user choose one of the named realizations versus 4326?
There are some older posts that deal with this question:
https://community.esri.com/t5/coordinate-reference-systems-questions/what-epoch-is-gcs-wgs-1984-in-10-4/m-p/877307#M1799
https://community.esri.com/t5/mobile-gis-questions/transformations-between-various-nad83-and-wgs84/m-p/821388
https://community.esri.com/t5/coordinate-reference-systems-questions/what-version-of-wgs84-is-in-arcgis/m-p/767492#M141
After reading them, it's still not clear to me how ArcGIS treats different realizations of WGS84.
Pinging @MelitaKennedy about this one. She's very knowledgeable about coordinate systems, datums, etc.
I would like some clarification on this as well! One would think that the G2139 realization would be there by now.
Any more news on this. I am not seeing WGS 84(G2139) in ArcGIS Pro 3.0.3. This realization has been out for nearly 2 years! I know that the differences between WGS 84(G2139) and WGS 84(G1762) is tiny but the current realization should still be usable in ESRI's software.
(U) NGA keeps the WGS 84 RF closely aligned to the International Terrestrial Reference Frame(ITRF). This ensures adherence to international standards and facilitates interoperability with otherGNSS. In this pursuit, a new realization of WGS 84 RF was introduced on January 3, 2021 that removedsmall systematic biases with respect to ITRF. Accordingly, the current frame is designated WGS84(G2139) and replaces WGS 84(G1762’). WGS 84(G2139) is coincident with ITRF14(IGb14) for thepurposes of positioning and navigation.(U) Table 1 lists the 7-parameter transformation for (G1762’) – to – (G2139). Using a mean Earthradius of 6,371,000 meters; the translations are sub-centimeter and the rotations are negligible but thescale change imparts a height adjustment of -2.8 centimeters at this mean radius.Table 1. 7-parameter transformation from WGS 84(G1762’) to WGS 84(G2139)Translation in x 0.0058 metersTranslation in y -0.0064 metersTranslation in z 0.0070 metersAngular displacement in x 0.08 milli-arc-secondsAngular displacement in y 0.04 milli-arc-secondsAngular displacement in z 0.12 milli-arc-secondsScale factor -4.4 parts-per-billion
following this subject. We need an update for the WGS 84(G2139)
Anyone? Bueller?
ArcGIS Pro 3.1 is supposed to be released Q1 2023. Hopeful the new WGS1984 (G2139) is added.
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