synching coordinate systems
Most of my layers are in NAD_1927_StatePlane_Texas_North_Central_FIPS_4202, but one layer is in GCS_North_American_1983. I have gone to the Data Frame Properties, then Coordinate System tab, then transformations, but the mismatched coordinate system doesn't seem to change. What am I doing wrong? Is there a better way to sync up my coordinate systems? Thanks.
Mapping Center Answer:
I am assuming that you have your data frame's coordinate system is set to: NAD_1927_StatePlane_Texas_North_Central_FIPS_4202; and then the process of specifying the transformation will cause the GCS_North_American_1983 to align when it is drawn. But, just specifying a transformation in the data frame will not actually change the GCS_North_American_1983 data. You would need to use the Project tool to do that, which would create a new dataset.
If that GCS_North_American_1983 data is not aligning after you've specified the transformation in the data frame properties, there are other potential causes for that, including:
- That data may not have been projected properly to begin with, meaning there is an implied datum shift. That's a hard one to work out because you would need to find the history of that dataset and learn how it was collected and projected.
- The data may have been collected from an independent source than your NAD27 data was collected--making it nearly impossible to expect alignment.
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