Disabling Accuracy Files for Datum Transforms
Spectrum Spatial supports conversions between certain datums by using algorithms that help
shift coordinates more accurately. A separate jar file that contains these algorithms is
installed by default for each datum transform located in the Spectrum Installation
- midev-core-coordsys-irishtm-version number-onprem.jar for Irish
- midev-core-coordsys-jgd2000-version number-onprem.jar (also enables the
updated version, JGD2011) for Japanese datums
- midev-core-coordsys-nadcon-version number-onprem.jar for US
- midev-core-coordsys-ntv2-version number-onprem.jar for NTV2, which
contains multiple conversions for many countries.
Note: An XML file inside this jar controls
which conversions are in use. To disable specific conversions within that file, stop the server
and extract the XML file from the jar. Use an editor to set the entries to "false" for
each conversion you want to disable. Add the edited XML file back into the jar, then restart the
- midev-core-coordsys-rgf93-version number-onprem.jar for French Lambert
By default, all of these jar files are loaded; however, their use can negatively affect the
performance of certain operations. These conversions can be disabled in some cases, such as when
you do not require a certain type of conversion (for example, if you have no need to convert
Japanese datums) or the performance gains outweigh the benefits of accuracy at lower zoom
To disable a specific transform:
- Stop the server.
- Remove the jar from the directory. Alternatively, you can rename the jar file to have a
different extension (for example, .jar~) which will prevent it from being loaded.
- Restart the server.