UINT16 default NoData update

[thare]

In researching how the PDS2 driver handles NoData within a HiRISE unsigned 16bit image I notice the default NoDATA value for UNIN16 should be changed. I am still seeing inconsistent use of MISSING_CONSTANT and CORE_NULL in several PDS labels but this ticket is not tackling that. Those values can override the PDS defaults if they exist.

Summary: This change defines the default UINT16 Nodata value to 0.

So current

          case 16 :
            if( strstr(osST,"UNSIGNED") != NULL )
                eDataType = GDT_UInt16;
            else
                eDataType = GDT_Int16;
            dfNoData = NULL2;
            break;

Should be updated to:

          case 16 :
            if( strstr(osST,"UNSIGNED") != NULL ) {
                eDataType = GDT_UInt16;
                dfNoData = NULL1;
            }
            else {
                eDataType = GDT_Int16;
                dfNoData = NULL2;
            }
            break;

questions? -Trent

[Even Rouault]

trunk r29624, branches/2.0 r29625 "PDS: fix nodata value for UInt16 to be 0 (#6064, patch by Trent Hare)"