[Geotiff] Help GeoTIFF tags

[Ricardo Fonseca]

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TIFF *tif=(TIFF*)0;

GTIF *gtif=(GTIF*)0; /* GeoKey-level descriptor */

// Read (Open) the TIFF file
tif=XTIFFOpen(tiffFilePath, "r");


if(!tif){
	tmpstr.Format("Error reading %s GeoTIFF file", tiffFilePath);
	MessageBox(tmpstr, "File Import", MB_OK);
	return 2; // Return error reading tiff file
}

/* Open GTIF Key parser */
gtif = GTIFNew(tif);
if (!gtif){
	tmpstr.Format("Error reading %s GeoTIFF file", tiffFilePath);
	MessageBox(tmpstr, "File Import", MB_OK);
	return 2; // Return error reading tiff file
}


int versions[3];

/* Get the GeoTIFF directory info */
GTIFDirectoryInfo(gtif,versions,0);
if (versions[MAJOR] > 1)
{
	//printf("this file is too new for me\n");
	tmpstr.Format("Error reading %s GeoTIFF file", tiffFilePath);
	MessageBox(tmpstr, "File Import", MB_OK);
	return 2; // Return error reading tiff file
}


// 6.2.1 GeoTIFF Configuration Keys	
geocode_t modelTypeCode, rasterModelType;

GTIFKeyGet(gtif, GTModelTypeGeoKey, &modelTypeCode, 0,1); /* Model Type Codes */	
GTIFKeyGet(gtif, GTRasterTypeGeoKey, &rasterModelType, 0, 1); /* Raster Type Codes */


//6.2.2 Geographic CS Parameter Keys
geocode_t geoCDTypeCode, geodeticDatumCode,
	primeMeridiumCode, linearUnitCode, linearUnitValue,
	angularUnitCode, angularUnitValue, ellipsoideCode,
	semiMajorAxis, semiMinorAxis, geoInvertFlattening,
	angularUnitsCode, primeMeridianLongitude;

GTIFKeyGet(gtif, GeographicTypeGeoKey, &geoCDTypeCode, 0, 1); /* Geographic CS Type Codes */	
GTIFKeyGet(gtif, GeogGeodeticDatumGeoKey, &geodeticDatumCode, 0, 1); /* Geodetic Datum Codes */	
GTIFKeyGet(gtif, GeogPrimeMeridianGeoKey, &primeMeridiumCode, 0, 1); /* Prime Meridian Codes */	
GTIFKeyGet(gtif, GeogLinearUnitsGeoKey, &linearUnitCode, 0, 1); /* Linear Units Codes */	
GTIFKeyGet(gtif, GeogLinearUnitSizeGeoKey, &linearUnitValue, 0, 1); /* Linear Units (meters) */	
GTIFKeyGet(gtif, GeogAngularUnitsGeoKey, &angularUnitCode, 0, 1); /* Angular Units Codes */	
GTIFKeyGet(gtif, GeogAngularUnitSizeGeoKey, &angularUnitValue, 0, 1); /* Angular Units (radians) */
GTIFKeyGet(gtif, GeogEllipsoidGeoKey, &ellipsoideCode, 0, 1); /* Ellipsoid Codes */
GTIFKeyGet(gtif, GeogSemiMajorAxisGeoKey, &semiMajorAxis, 0, 1); /* Geographic Semi Major Axis (GeogLinearUnits) */
GTIFKeyGet(gtif, GeogSemiMinorAxisGeoKey, &semiMinorAxis, 0, 1); /* Geographic Semi Minor Axis (GeogLinearUnits) */
GTIFKeyGet(gtif, GeogInvFlatteningGeoKey, &geoInvertFlattening, 0, 1); /* Geographic Invert Flattening (ratio) */
GTIFKeyGet(gtif, GeogAzimuthUnitsGeoKey, &angularUnitsCode, 0, 1); /* Angular Units Codes */
GTIFKeyGet(gtif, GeogPrimeMeridianLongGeoKey, &primeMeridianLongitude, 0, 1); /* Prime Meridian Longitude (GeogAngularUnit) */

//6.2.3 Projected CS Parameter Keys
geocode_t projCSSystemCode, ProjCode, projCoordTransfCode, linearUnitsCode,
	linearUnitSize,projStdParallel1,projStdParallel2,projNatOriginLong,
	projNatOriginLat, projFalseEasting, projFalseNorthing, projFalseOriginLong,
	projFalseOriginLat,projFalseOriginEasting,projFalseOriginNorthing,
	projCenterLong,projCenterLat,projCenterEasting,projCenterNorthing,
	projScaleAtNatOrigin, projScaleAtCenter, projAzimuthAngle,
	projStraightVertPoleLong;

GTIFKeyGet(gtif, ProjectedCSTypeGeoKey, &projCSSystemCode, 0, 1); /* Projected CS Type Codes */
GTIFKeyGet(gtif, ProjectionGeoKey, &ProjCode, 0, 1); /* Projection Code */	
GTIFKeyGet(gtif, ProjCoordTransGeoKey, &projCoordTransfCode, 0, 1); /* Coordinate Transformation Codes */
GTIFKeyGet(gtif, ProjLinearUnitsGeoKey, &linearUnitsCode, 0, 1); /* Linear Units Codes */
GTIFKeyGet(gtif, ProjLinearUnitSizeGeoKey, &linearUnitSize, 0, 1); /* Linear Units Size (meters) */
GTIFKeyGet(gtif, ProjStdParallel1GeoKey, &projStdParallel1, 0, 1); /* ProjStdParallel1 (GeogAngularUnit) */
GTIFKeyGet(gtif, ProjStdParallel2GeoKey, &projStdParallel2, 0, 1); /* ProjStdParallel2 (GeogAngularUnit) */
GTIFKeyGet(gtif, ProjNatOriginLongGeoKey, &projNatOriginLong, 0, 1); /* ProjNatOriginLong (GeogAngularUnit) */
GTIFKeyGet(gtif, ProjNatOriginLatGeoKey, &projNatOriginLat, 0, 1); /* ProjNatOriginLat (GeogAngularUnit) */
GTIFKeyGet(gtif, ProjFalseEastingGeoKey, &projFalseEasting, 0, 1); /* ProjFalseEasting (ProjLinearUnits) */
GTIFKeyGet(gtif, ProjFalseNorthingGeoKey, &projFalseNorthing, 0, 1); /* ProjFalseNorthing (ProjLinearUnits) */
GTIFKeyGet(gtif, ProjFalseOriginLongGeoKey, &projFalseOriginLong, 0, 1); /* ProjFalseOriginLong (GeogAngularUnit ) */
GTIFKeyGet(gtif, ProjFalseOriginLatGeoKey, &projFalseOriginLat, 0, 1); /* ProjFalseOriginLat (GeogAngularUnit ) */
GTIFKeyGet(gtif, ProjFalseOriginEastingGeoKey, &projFalseOriginEasting, 0, 1); /* ProjFalseOriginEasting (ProjLinearUnits ) */
GTIFKeyGet(gtif, ProjFalseOriginNorthingGeoKey, &projFalseOriginNorthing, 0, 1); /* ProjFalseOriginNorthing (ProjLinearUnits ) */	
GTIFKeyGet(gtif, ProjCenterLongGeoKey, &projCenterLong, 0, 1); /* ProjCenterLong (GeogAngularUnit ) */
GTIFKeyGet(gtif, ProjCenterLatGeoKey, &projCenterLat, 0, 1); /* ProjCenterLat (GeogAngularUnit ) */
GTIFKeyGet(gtif, ProjCenterEastingGeoKey, &projCenterEasting, 0, 1); /* ProjCenterEasting (ProjLinearUnits ) */
GTIFKeyGet(gtif, ProjCenterNorthingGeoKey, &projCenterNorthing, 0, 1); /* ProjCenterNorthing (ProjLinearUnits ) */
GTIFKeyGet(gtif, ProjScaleAtNatOriginGeoKey, &projScaleAtNatOrigin, 0, 1); /* ProjScaleAtNatOrigin (ratio) */
GTIFKeyGet(gtif, ProjScaleAtCenterGeoKey, &projScaleAtCenter, 0, 1); /* ProjScaleAtCenter (ratio ) */
GTIFKeyGet(gtif, ProjAzimuthAngleGeoKey, &projAzimuthAngle, 0, 1); /* ProjAzimuthAngle (GeogAzimuthUnit ) */
GTIFKeyGet(gtif, ProjStraightVertPoleLongGeoKey, &projStraightVertPoleLong, 0, 1); /* ProjStraightVertPoleLong (GeogAzimuthUnit ) */	

//6.2.4 Vertical CS Keys
geocode_t verticalCSType, verticalDatum, verticalUnits;	

GTIFKeyGet(gtif, VerticalCSTypeGeoKey, &verticalCSType, 0, 1); /* Vertical CS Type Codes */
GTIFKeyGet(gtif, VerticalDatumGeoKey, &verticalDatum, 0, 1); /* Vertical CS Datum Codes */
GTIFKeyGet(gtif, VerticalUnitsGeoKey, &verticalUnits, 0, 1); /* Linear Units Codes */


/* get rid of the key parser */
GTIFFree(gtif);

// Close raw and tiff file and free memory
_TIFFfree(buf); 
XTIFFClose(tif);