laptop and a wrench

Bug

Projecting a feature class from GDA 1994 MGA Zone 55 (WKID 28355) to GDA2020 MGA Zone 55 (WKID 7855) and saving it as a feature class introduces a minor offset.

ArcGIS Pro
Bug ID Number BUG-000165963
SubmittedMarch 15, 2024
Last ModifiedJune 5, 2024
Applies toArcGIS Pro
Version foundN/A
Operating SystemWindows OS
Operating System Version10.0 64 Bit
StatusAs Designed

Additional Information

Geodatabase data uses a 'spatial reference'. In addition to the coordinate reference system, there are other values used for storage and processing. The storage parameters include the x, y, z, and m resolutions, which are in the unit of the coordinate system and control how precise the stored coordinate values are. The default for x, y and z resolution values is 0.1 mm (0.0001 m) or the equivalent in the unit of the coordinate system. The processing values are the x, y, z, and m tolerance values and the default is 1 mm (0.001 m). By processing, things like deciding two points are coincident or two segments touching at the end point. The parameters for a spatial reference for a shapefile are calculated as needed and are not stored within the shapefile. Zooming in to 1:0.05 is well beyond what is recommended. If you check the coordinate values of the sample point, the original data is more precise than 4 decimal places, while the feature class is at 4 decimal places to match the spatial reference precision. There are some white papers that discuss this, like: Understanding Coordinate Management in the Geodatabase: https://downloads.esri.com/support/whitepapers/ao_/J9655_Understanding_Coordinate_Management_Esri_Whitepaper.pdf Understanding Geometric Processing in ArcGIS: https://downloads.esri.com/support/documentation/ao_/J9880_ArcGIS_CoordMgmt_Geometric_Processing.pdf

Steps to Reproduce

Bug ID: BUG-000165963

Software:

  • ArcGIS Pro

Get notified when the status of a bug changes

Download the Esri Support App

Discover more on this topic

Esri Community

Search for related information

Training

Find training related to this topic

ArcGIS Ideas

Explore ideas and give feedback

Get help from ArcGIS experts

Contact technical support

Download the Esri Support App

Go to download options