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I am projecting a shapefile from "NAD 1983 2011 StatePlane New Hampshire FIPS 2800 Ft US" to "EPSG 4326, WGS 84." However, the result output by QGIS seems to differ by about 3.25 feet from the ArcMap output. The QGIS shapefile is also about 20% smaller in file size. I tried the same function in FME and it matches the QGIS output spatially, but has the same file size as the ArcMap output. I tried in Global Mapper and the output is about .001 feet North of what I get with QGIS and FME

Why don't these match up?

Figure below: Blue is ArcGIS and green is QGIS

Original Vertex: (1082696.828, 1021749.922 feet)

QGIS Vertex: (-71.28406755831366581, 45.30234233581942505)

ArcMAP Vertex:(-71.28406837515765915 45.3023515785411135)

enter image description here

  • what are you comparing it to? – Ian Turton Feb 14 '17 at 16:06
  • I'm comparing the QGIS output to the ArcMap output. I'm comparing the polygons from the two shapefiles and they don't line up. – Paul_GIS Feb 14 '17 at 16:13
  • may be you need to add a screen shot – Ian Turton Feb 14 '17 at 16:18
  • Coordinates of one source vertex as original and after conversion with QGIS and ArcMAP would be nice. – user30184 Feb 14 '17 at 16:44
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    Well, there's your difference. WGS84/ITRFxx are about 1 m from NAD83 2011. If you don't want the transformation, set it to none, or use 6318 (NAD 1983 (2011)) as the input GCS rather than WGS84. We don't have a WGS84/NAD83(2011) transformation that has its parameters set to zeroes. Another possible solution is to create a custom transformation. – mkennedy Feb 14 '17 at 20:23
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Projecting to EPSG 4326, WGS 84 in ArcMap 10.5 seems to require a transformation. In ArcGIS Pro 1.4 or QGIS 2.18.3, a transformation is not required to project to EPSG 4326, WGS 84. The difference in projecting to EPSG 4326, WGS 84 in ArcGIS Pro vs QGIS seems to be about 1/10,000 of an inch.

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