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ERROR 4: Unable to open EPSG support file gcs.csv.

RTC

Our app is getting this error since updating to 100.15.4 SDK for iOS. How can we resolve this issues?

ERROR 4: Unable to open EPSG support file gcs.csv. Try setting the GDAL_DATA environment variable to point to the directory containing EPSG csv files.

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Ting

I'm not an expert on projection systems, but I guess it depends on what type of projection transformation you need. For instance, if you don't use NADCON or NTV2 transformations, you can delete their folders from the pedata.

A huge chunk of data is in the vertical coordinate system's transformation folder, so check with your client on what type of transformation they need.

When a transformation is removed, it will set the Boolean isMissingProjectionEngineFiles to true.

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Ting

Please visit https://developers.arcgis.com/ios/downloads/#projection-engine-data to download the projection engine data, and see gdaldata folder inside. It should contain the gcs.csv file.

This change happened a few releases back, though I cannot pin down the exact time (some time around 2021).

Read more about spatial reference and projection in this doc.

There is a related sample "List transformations" that you may take a look at.

Let me know if you have other questions.

RTC

Thank you for the info!

RTC

The download is about 2GB, zipped. Do I only need the gcs.csv file for the app?

Ting

A huge chunk of data is in the vertical coordinate system's transformation folder, so check with your client on what type of transformation they need.

When a transformation is removed, it will set the Boolean isMissingProjectionEngineFiles to true.

RTC

OK thanks Ting! I will find out which transformations are being used by our client and remove the rest.

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