I think what you want is this: https://github.com/boundlessgeo/prj2epsg https://github.com/boundlessgeo/prj2epsg GeoTools (Java GIS library) has several versi

I think what you want is this: https://github.com/boundlessgeo/prj2epsg https://github.com/boundlessgeo/prj2epsg GeoTools (Java GIS library) has several versions of the EPSG database available as JARs and you can use the CRS class to do lookups in both directions. https://github.com/boundlessgeo/prj2epsg/blob/master/src/main/java/org/opengeo/prj2epsg/Search.java#L155 https://github.com/boundlessgeo/prj2epsg/blob/master/src/mai... You may also be able to do a query on the SPATIAL_REF_SYS table in Postgres/PostGIS for what you want to do. Hope this helps...