Lambert Conformal Conic, NAD27 I have corresponding the PCI ``central meridian'' with NatOriginLong, and our ``latitude of origin'' with FalseOriginLat. There is no corresponding value to the FalseOriginLong in EASI/PACE (based on GCTP) so I always set it to zero, and report and error on import if it is not zero. We also always use the _2SP (two standard parallel form), no generating, nor importing the other forms at this time. Frank Warmerdam warmerda@pci.on.ca Based on a tech note in the GeoTIFF mailing list archive, the use of NatOriginLong is wrong. I have submitted a bug report to PCI on the issue. The tech note indicates that NatOriginLong is optional, and if present must always match FalseOriginLong. Frank Warmerdam warmerda@home.com Geotiff_Information: Version: 1 Key_Revision: 1.0 Tagged_Information: ModelTiepointTag (2,3): 0 0 0 -15411.6153 15448.6988 0 ModelPixelScaleTag (1,3): 60 60 0 End_Of_Tags. Keyed_Information: GTModelTypeGeoKey (Short,1): ModelTypeProjected GTRasterTypeGeoKey (Short,1): RasterPixelIsArea GTCitationGeoKey (Ascii,17): "LCC E000" GeographicTypeGeoKey (Short,1): GCS_NAD27 GeogLinearUnitsGeoKey (Short,1): Linear_Meter GeogAngularUnitsGeoKey (Short,1): Angular_Degree ProjectedCSTypeGeoKey (Short,1): User-Defined ProjectionGeoKey (Short,1): User-Defined ProjCoordTransGeoKey (Short,1): CT_LambertConfConic_2SP ProjLinearUnitsGeoKey (Short,1): Linear_Meter ProjStdParallel1GeoKey (Double,1): 33.903634 ProjStdParallel2GeoKey (Double,1): 33.62529 ProjNatOriginLongGeoKey (Double,1): -117.474543 ProjFalseEastingGeoKey (Double,1): 0 ProjFalseNorthingGeoKey (Double,1): 0 ProjFalseOriginLongGeoKey (Double,1): 0 ProjFalseOriginLatGeoKey (Double,1): 33.764462 End_Of_Keys. End_Of_Geotiff. PROREP Georeference Segment Report Georeference Units : LCC E000 Projection : Lambert Conformal Conic Datum - Ellipsoid : NAD 27 - Clarke 1866 Upper Left Corner : -15411.615 E 15448.699 N Upper Right Corner : 15488.385 E 15448.699 N Image Centre : 38.385 E -1.301 N Lower Left Corner : -15411.615 E -15451.301 N Lower Right Corner : 15488.385 E -15451.301 N Pixel Size : 60.000 E 60.000 N Upper Left Corner : 117d38'28.22" W Lon 33d54'13.08" N Lat Upper Right Corner : 117d18'25.50" W Lon 33d54'13.07" N Lat Image Centre : 117d28'26.86" W Lon 33d45'52.02" N Lat Lower Left Corner : 117d38'26.28" W Lon 33d37'30.15" N Lat Lower Right Corner : 117d18'27.45" W Lon 33d37'30.14" N Lat True origin : 117d28'28.3544"W 33d45'52.0633"N 1st std parallel : 33d54'13.0825"N 2nd std parallel : 33d37'31.0441"N