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When exporting an ArcGIS Image Server image service that exceeds 20,000 columns and/or 10,000 rows, an error message similar to the following may be returned:
"Could not export image. The requested number of columns: '30000' exceeds the applications limit: '20000'."
The ArcGIS Image Server client configuration files (*.ISCConfig) store a number of properties that define the capabilities of the client. There is a *.ISCConfig file for each ArcGIS Image Server client, such as MicroStation, ArcGIS, or one developed for a custom application. For ArcGIS 9.2, the configuration file is stored at C:\Program Files\ArcGIS\Image Server\XADefs\ArcGIS.ISCConfig. For ArcGIS 9.3, the configuration file is stored at C:\Program Files\ArcGIS\Bin\ArcGIS.ISCConfig. There are two parameters that control the application limit for exported images: MaxNCols and MaxNRows. By default, these are set to 20,000 and 10,000 respectively.
The default limit for the maximum number of exported columns and rows can be bypassed by modifying the values accordingly to allow the exportation of the desired number of columns and rows. To achieve this for ArcMap: