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Collector to ArcGIS transformation issue.

Question asked by LancasterGIS on Apr 13, 2017
Latest reply on Aug 31, 2018 by duncanm

We've got an issue with our Collector points when bringing them back into ArcMap, I'm going to try and describe our process so someone can tell me what I'm doing wrong.

 

Our data is stored in Ohio State Plane South, I serve it out in Web Mercator for use in collector.  To collect the data we are linking a 4" accuracy Trimble unit to an iPad correcting using the state VRS system.  

 

The problem arises when we start using the data back in house.  If we load the pints directly from the database they appear off from the ortho by pretty much the same direction and distance for every point.  But if we load the points from ArcGIS online they appear in the correct place.  However if you look at the points in collector they appear to be off exactly as the database points are in arcmap.

 

The best I can figure is that the transformation has to be the source of the issue.  The problem I see is that we are using three different projections in comparing the points:

Ortho is in State Plane Ohio South (Nad 83 HARN)

Database points are in State Plane Ohio South (NAD 83)

Service points are in WGS 84 Web Mercator Auxillary Sphere

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