Projections
Bradley Mclain
bradleym06 at HOTMAIL.COM
Wed Jan 31 18:55:35 EST 2007
Hi
I'm having some problems with projections in Mapserver. I have three pieces
of data, 2 polygon shapefiles and a GeoTIFF raster image. I am trying to
define their projections so that they align correctly as the raster is
slightly off from the two shapefiles.
I have managed to extract the geographical info from the files but I have no
idea where I define it in the mapfile and what info I need to include (or
what any of it means).
I have attached the three text files which include the geographical data for
each, can someone explain to me how to define these in a mapfile, eg where I
need to do it and what info I need.
Can you please include lots of detail and description so I can fully
understand :)
Thanks
Brad
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Layer name: DBW_Home_Bilbul_Cadastral_Boundary
Geometry: Polygon
Feature Count: 15
Extent: (419320.137222, 6205167.425465) - (421949.715102, 6207719.690811)
Layer SRS WKT:
PROJCS["GDA_1994_MGA_Zone_55",
GEOGCS["GCS_GDA_1994",
DATUM["Geocentric_Datum_of_Australia_1994",
SPHEROID["GRS_1980",6378137.0,298.257222101]],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.0174532925199433]],
PROJECTION["Transverse_Mercator"],
PARAMETER["False_Easting",500000.0],
PARAMETER["False_Northing",10000000.0],
PARAMETER["Central_Meridian",147.0],
PARAMETER["Scale_Factor",0.9996],
PARAMETER["Latitude_Of_Origin",0.0],
UNIT["Meter",1.0]]
LUID: Real (11.0)
PLANTYPE: String (4.0)
TAG: String (50.0)
Area: Real (19.11)
Perimeter: Real (19.11)
Acres: Real (19.11)
Hectares: Real (19.11)
Bound_type: String (25.0)
Prop_ID: String (30.0)
OGRFeature(DBW_Home_Bilbul_Cadastral_Boundary):0
LUID (Real) = 103663790
PLANTYPE (String) = 13
TAG (String) = 116//751728
Area (Real) = 206766.29741414590
Perimeter (Real) = 1930.52158953932
Acres (Real) = 51.09308655258
Hectares (Real) = 20.67662974141
Bound_type (String) = Cadastre
Prop_ID (String) = DBW_Home_Bilbul
POLYGON ((419849.019570303731598
6205435.040179193019867,419680.452153401391115
6205707.173638857901096,420228.545299204241019
6206046.107636354863644,420397.849921675398946
6205772.639121992513537,419849.019570303731598 6205435.040179193019867))
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Layer name: DBW_Hemley_2593_Cadastral_Boundary
Geometry: Polygon
Feature Count: 3
Extent: (422645.120770, 6208302.281805) - (423450.690420, 6208880.746240)
Layer SRS WKT:
PROJCS["GDA_1994_MGA_Zone_55",
GEOGCS["GCS_GDA_1994",
DATUM["Geocentric_Datum_of_Australia_1994",
SPHEROID["GRS_1980",6378137.0,298.257222101]],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.0174532925199433]],
PROJECTION["Transverse_Mercator"],
PARAMETER["False_Easting",500000.0],
PARAMETER["False_Northing",10000000.0],
PARAMETER["Central_Meridian",147.0],
PARAMETER["Scale_Factor",0.9996],
PARAMETER["Latitude_Of_Origin",0.0],
UNIT["Meter",1.0]]
LUID: Real (11.0)
PLANTYPE: String (4.0)
TAG: String (50.0)
Area: Real (19.11)
Perimeter: Real (19.11)
Acres: Real (19.11)
Hectares: Real (19.11)
Bound_type: String (40.0)
Prop_ID: String (30.0)
OGRFeature(DBW_Hemley_2593_Cadastral_Boundary):0
LUID (Real) = 103664166
PLANTYPE (String) = 13
TAG (String) = 288//751728
Area (Real) = 73981.56105988749
Perimeter (Real) = 1173.94681513112
Acres (Real) = 18.28124965142
Hectares (Real) = 7.39815610599
Bound_type (String) = Cadastre
Prop_ID (String) = Hemley_2593
POLYGON ((423067.736698167922441
6208782.058439230546355,423228.702213083277456
6208880.746239688247442,423450.690419794409536
6208521.27053206320852,423266.332749532884918
6208468.748745977878571,423260.736078957444988
6208477.574468746781349,423067.736698167922441 6208782.058439230546355))
-------------- next part --------------
Driver: GTiff/GeoTIFF
Size is 9530, 6552
Coordinate System is `'
Origin = (418485.188000000023749,6208828.519999999552965)
Pixel Size = (0.609681177000000,-0.609608973000000)
Metadata:
AREA_OR_POINT=Area
TIFFTAG_SOFTWARE=IMAGINE TIFF Support
Copyright 1991 - 1999 by ERDAS, Inc. All Rights Reserved
@(#)$RCSfile: etif.c $ $Revision: 1.9.1.2 $ $Date: 2001/12/05 00:33:12Z $
TIFFTAG_XRESOLUTION=1
TIFFTAG_YRESOLUTION=1
TIFFTAG_RESOLUTIONUNIT=1 (unitless)
Corner Coordinates:
Upper Left ( 418485.188, 6208828.520)
Lower Left ( 418485.188, 6204834.362)
Upper Right ( 424295.450, 6208828.520)
Lower Right ( 424295.450, 6204834.362)
Center ( 421390.319, 6206831.441)
Band 1 Block=9530x1 Type=Byte, ColorInterp=Red
Band 2 Block=9530x1 Type=Byte, ColorInterp=Green
Band 3 Block=9530x1 Type=Byte, ColorInterp=Blue
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