The problem might be that in your mapserver proj4 implementation; the
epsg:20355 is missing towgs84 parameters. These parameters tell
mapserver the shift that is present between the wgs84 ellipsoid and the
greenwich ellipsoid.
Could you check out the epsg file in your proj/nad directory; look up
<20355> there and see if you have something like
+towgs84=-70.9,-151.8,-41.4,0,0,0,0 default it says something like no_defs.
You can find a description on ellipsoid differences here:
http://www.remotesensing.org/proj/gen_parms.html
I looked up this somewhere on a mailinglist: ellps=aust_SA
towgs84=-133,-48148,0,0,0,0
See if it can help you.
Good luck
Milo van der Linden
Gabe schreef:
Hi
I am having trouble with the projection on a raster image. The map is being
displayed but the raster layer is shifted by about 210m.
The mapfiles main projection is EPSG:4326
I have a .ecw file with this gdalinfo:
Driver: ECW/ERMapper Compressed Wavelets
Files: aerial_photo_2003.ecw
Size is 53334, 53334
Coordinate System is:
PROJCS["TMAMG55",
GEOGCS["AUSTRALIAN GEODETIC",
DATUM["AGD84",
SPHEROID["ANS",6378160,298.25]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433]],
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",0],
PARAMETER["central_meridian",147],
PARAMETER["scale_factor",0.9996],
PARAMETER["false_easting",500000],
PARAMETER["false_northing",10000000],
UNIT["Meter",1]]
Origin = (655179.380000000000000,7701896.290000000000000)
Pixel Size = (1.500000000000000,-1.500000000000000)
Corner Coordinates:
Upper Left ( 655179.380, 7701896.290) (148d29'26.84"E, 20d46'34.32"S)
Lower Left ( 655179.380, 7621895.290) (148d29'52.92"E, 21d29'55.68"S)
Upper Right ( 735180.380, 7701896.290) (149d15'32.31"E, 20d46'4.13"S)
Lower Right ( 735180.380, 7621895.290) (149d16'11.81"E, 21d29'24.34"S)
Center ( 695179.880, 7661895.790) (148d52'45.97"E, 21d 8'1.22"S)
Band 1 Block=53334x1 Type=Byte, ColorInterp=Red
Overviews: arbitrary
Band 2 Block=53334x1 Type=Byte, ColorInterp=Green
Overviews: arbitrary
Band 3 Block=53334x1 Type=Byte, ColorInterp=Blue
Overviews: arbitrary
I have a vector layer which was a tab file with the projection AMG Zone
55(AGD 84). This was loaded into postgis with ogr2ogr using these options
ogr2ogr -overwrite -f "PostgreSQL" PG:"<database details>" thefile.tab -nln
t_table -lco "GEOMETRY_NAME=the_geom" -t_srs EPSG:4326 -skipfailures. I
have done this before on different installations and it usually gives me a
table where srid =4326 however in this case it is giving me a newly created
srid = 32772 (this installation is different in that we are using postgres
8.3 and ms4w 2.2.7). I have checked and as far as I can tell this layer is
being displayed correctly.
here are the relevant layers from my mapfile
LAYER
NAME "Photography_2003"
GROUP "Photography_2003"
DATA "mackay/Images/aerial_photo_2003.ecw"
TYPE RASTER
STATUS ON
PROJECTION
"init=epsg:20355"
END
METADATA
"DESCRIPTION" "Photography 2003"
END
END
And
LAYER
NAME "Paddocks"
GROUP "Paddocks"
STATUS ON
DATA "the_geom from t_the_table using unique oid using SRID=32772"
TYPE POLYGON
CONNECTIONTYPE postgis
CONNECTION "<connection string>"
MAXSCALE 2000000
CLASS
NAME "Paddock"
STYLE
ANGLE 120
WIDTH 1
SIZE 13
COLOR 0 128 0
OUTLINECOLOR 0 128 0
SYMBOL "hatched"
END
END
END
Any help would be appreciated.
Gabriel
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