I work in county government and we are currently in a transitional phase in GIS software - we currently use both ArcMap 10.8.2 and ArcGIS Pro 3.2.0. We've recently noticed some odd discrepancies in reported distances after splitting polygons in a shapefile in ArcGIS Pro and then viewing that same shapefile in ArcMap. We are using the same county coordinate system and units (US feet) in both versions of the software.
For example, I'll create a simple square polygon in a shapefile in ArcGIS Pro that is exactly 3000 ft by 3000 ft:
I then open the same shapefile with the same coordinate system in ArcMap 10.8.2 - everything measures out as it should:
However if I take that same polygon in ArcGIS Pro, measure exactly 1500 ft from a corner and split off a portion:
It appears like this in ArcMap 10.8.2:
Instead of the 1500 feet as it was split in Pro, it now shows the measurement from the corner to the split location as 1500.001082 feet. The split also seems to have modified the north/south dimension as well:
Bringing the shapefile back into ArcGIS Pro - the measurements list out exactly as we split them - a 3000 ft x 3000 ft square split 1500 ft from the bottom corner.
The difference measured is indeed very, very small - but we are at a loss at why there would be any difference - especially when using the same units and coordinate system. There are also concerns that this could introduce tiny gaps or overlaps in split data that is being using in both ArcMap and ArcPro.
Hopefully someone has some ideas on why we're seeing these differences when using the split tool - thank you in advance!