//*************************************************************************************************
//! Given a projection instance, this method determines the corresponding EPSG code. Obviously
//! this is only needed if the projection does not have its PCS code assigned (it is NULL). This
//! happens when the projection was constructed with full parameters instead of the EPSG code.
//! Returns integer EPSG code if match was found or 0 if not found.
//*************************************************************************************************
ossim_uint32
ossimEpsgProjectionDatabase::findProjectionCode(const ossimMapProjection& lost_proj) const
{
ossimString lost_type (lost_proj.getClassName());
// Shortcut for EPSG:4326 (WGS-85 geographic rectangular -- very common):
if ((lost_type == "ossimEquDistCylProjection") && (lost_proj.getDatum()->epsgCode() == 6326))
return 4326;
ossim_uint32 found_code = 0;
if (lost_type == "ossimUtmProjection")
{
found_code = getCodeFromUtmProj(dynamic_cast<const ossimUtmProjection*>(&lost_proj));
if (found_code)
return found_code;
}
if (m_projDatabase.empty())
initialize();
ossimString lookup;
std::multimap<ossim_uint32, ossimRefPtr<ProjDbRecord> >::iterator db_iter =
m_projDatabase.begin();
while ((db_iter != m_projDatabase.end()) && (found_code == 0))
{
ossimRefPtr<ProjDbRecord> db_record = db_iter->second;
if ( db_record.valid() )
{
// Has a projection already been created for this db iter?
if (!db_record->proj.valid())
{
// No projection has been created yet for this DB entry.
// NOTE: THIS IS VERY SLOW BECAUSE WE ARE INSTANTIATING EVERY PROJECTION IN THE DB!!!
db_record->proj = dynamic_cast<ossimMapProjection*>(findProjection(db_record->code));
}
if (db_record->proj.valid() && (*(db_record->proj.get()) == lost_proj))
{
found_code = db_record->code;
// Hack to remap projection code 4087 to 4326 (which is not really a projection
// code but other packages like to see 4326 for geographic projections.
// Hacked under protest (OLK, 08/2010)
if (found_code == 4087)
found_code = 4326;
}
}
++db_iter;
}
return found_code;
}
//*************************************************************************************************
//! Given a projection instance, this method determines the corresponding EPSG code. Obviously
//! this is only needed if the projection does not have its PCS code assigned (it is NULL). This
//! happens when the projection was constructed with full parameters instead of the EPSG code.
//! Returns integer EPSG code if match was found or 0 if not found.
//*************************************************************************************************
ossim_uint32
ossimEpsgProjectionDatabase::findProjectionCode(const ossimMapProjection& lost_proj) const
{
ossimString lost_type (lost_proj.getClassName());
ossimString lookup;
ossimRefPtr<ossimMapProjection> found_proj = 0;
ossimMapProjectionFactory* factory = ossimMapProjectionFactory::instance();
ossim_uint32 found_code = 0;
std::vector<ProjRecord>::const_iterator db_iter = m_projDatabase.begin();
while ((db_iter != m_projDatabase.end()) && (found_code == 0))
{
// To avoid having to instantiate all projections in the database, let's peek in the record's
// KWL for the projection type and only instantiate those that match:
lookup = db_iter->kwl.find(ossimKeywordNames::TYPE_KW);
if (lost_type == lookup)
{
// We have a match, instantiate the projection from the associated KWL in the DB. Trick
// the registry into using appropriate factory by setting PCS code temporarily to 0 to
// avoid infinite recursion:
ossimKeywordlist kwl (db_iter->kwl); // make copy since this is a const method
kwl.remove(ossimKeywordNames::PCS_CODE_KW);
found_proj = PTR_CAST(ossimMapProjection, factory->createProjection(kwl));
// Test for same-ness between target and found, and return if matching:
if (found_proj.valid() && (*found_proj == lost_proj))
{
found_code = db_iter->code;
// Hack to remap projection code 4087 to 4326 (which is not really a projection
// code but other packages like to see 4326 for geographic projections.
// Hacked under protest (OLK, 08/2010)
if (found_code == 4087)
found_code = 4326;
}
}
db_iter++;
}
return found_code;
}