[gdal-dev] Cannot get spatial reference system from ozi file

[Nik Sands]

Hi all,

My application is reading in ozi file pairs (.ozf2/.map), warping them and saving out as GeoTIFF or other file formats using GDAL.  It works fine for my own ozf files, but not for the files sent to me by one of my users (who apparently has a large number of files they want to use).

It has been unable to get a useful spatial reference system from the ozi file pair (.ozf2/.map) sent to me (.map content below).  The following code:

------------------
	OGRSpatialReferenceH srcSRS = OSRNewSpatialReference(pszSrcWKT);
	char *srcWKT;

	OSRExportToWkt(srcSRS, &srcWKT);
	printf("\n%s\n\n", srcWKT);
------------------

produces the following output:

------------------
	LOCAL_CS["unnamed",UNIT["unknown",1]]
------------------

Can somebody please help me to use GDAL to obtain a valid spatial reference system from this .map file (content below)?

Note that I'm using a fairly recent build of GDAL trunk that includes all the ozi datums, etc, including "Australian Geodetic 1966" and it is able to get a valid SRS from my own files that use the same ozi datum.

The complete content of the ozi .map file in question is below.

Thanks in anticipation,
Nik.


OziExplorer Map Data File Version 2.2
r2256.jgw
D:\Documents and Settings\nelsonp\My Documents\General Admin\Personal\Tasmania 1 to 25,000\North West OZF2\r2256.ozf2
1 ,Map Code,
Australian Geodetic 1966,WGS 84,   0.0000,   0.0000,WGS 84
Reserved 1
Reserved 2
Magnetic Variation,,,E
Map Projection,(UTM) Universal Transverse Mercator,PolyCal,No,AutoCalOnly,No,BSBUseWPX,No
Point01,xy,    0,    0,in, deg,    ,        ,,    ,        ,, grid, 55,219999.09067205,5570000.7412442,S
Point02,xy, 1000, 1000,in, deg,    ,        ,,    ,        ,, grid, 55,223259.16350298,5566740.6684133,S
Point03,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point04,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point05,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point06,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point07,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point08,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point09,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point10,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point11,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point12,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point13,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point14,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point15,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point16,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point17,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point18,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point19,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point20,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point21,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point22,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point23,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point24,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point25,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point26,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point27,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point28,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point29,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Point30,xy,     ,     ,in, deg,    ,        ,,    ,        ,, grid,   ,           ,           ,
Projection Setup,     0.000000000,  -120.000000000,     0.999600000,            0.00,     -4000000.00,    34.000000000,    40.500000000,,,
Map Feature = MF ; Map Comment = MC     These follow if they exist
Track File = TF      These follow if they exist
Moving Map Parameters = MM?    These follow if they exist
MM0,Yes
MMPNUM,4
MMPXY,1,0,0
MMPXY,2,6136,0
MMPXY,3,6136,3069
MMPXY,4,0,3069
MMPLL,1, 143.721340, -39.973660
MMPLL,2, 143.955261, -39.980047
MMPLL,3, 143.951253, -40.070068
MMPLL,4, 143.717025, -40.063661
MM1B,3.251882
MOP,Map Open Position,0,0
IWH,Map Image Width/Height,6136,3069