ArcGIS Collector - How to Collect High Accuracy Elevation Values

GISUSER6

Hello,

With the recent support for high accuracy GPS receives in the ArcGIS Collector application, we are looking to use a cm accuracy GPS receiver (EOS Arrow 200) to collect accuracy horizontal and vertical elevations. I am aware that GNSS will only allow me to collect vertical elevations within 2-4cm with an open sky, but that is enough for the application we are using it for.

My question is, how does ArcGIS Collector handle collecting elevations? I don't have a ton of knowledge about Geoids and how this comes into play with the elevation values. Does ArcGIS Collector handle the geoid data? Is there some post processing or conversion I have to do to actually have an accuracy elevation value?

Thanks for your help!

DanAllen

Our Arrow 200 paired with Collector stores the RTK ellipsoidal elevation value in Meters.  There does not appear to be support yet right in collector to convert this to orthometric feet.  In our case the values stored for elevation need to be adjusted about 116.6 feet after converting it through NGS geoid 12b https://www.ngs.noaa.gov/cgi-bin/GEOID_STUFF/geoid12B_prompt1.prl

Esri does have some tools to update your lat, long, and elevation attribute values in ArcMap automatically back in the office  https://github.com/Esri/collector-tools/tree/master/CollectorUtils

Hopefully someone from the collector team can verify this approach and whether the next update of collector will include support for vertical datum transformations on the fly.