Projections
Bradley Mclain
bradleym06 at HOTMAIL.COM
Wed Jan 31 20:59:31 EST 2007
Hi Jérôme
I tried what you said but still no luck, I tried several combinations, like
only for raster, only for polygons, and everything together including
defining in the mapfile. The map still shows but it is still off centre.
I attached the mapfile and a pic of the problem to give you a better idea.
I talked to someone before about this and they said the problem was
something to do with the fact the shapfile data takes into account the
spherical nature of the globe while the raster image does not.
Brad
>From: Jérôme Martin <gooogle at FREE.FR>
>Reply-To: Jérôme Martin <gooogle at FREE.FR>
>To: MAPSERVER-USERS at LISTS.UMN.EDU
>Subject: Re: [UMN_MAPSERVER-USERS] Projections
>Date: Thu, 1 Feb 2007 02:23:35 +0100
>
>Hi Bradley,
>
>it is normal if your raster is not correctly aligned with the 2 goods
>shapefiles.
>
>In fact, yours shapefiles are on the projection "GDA_1994_MGA_Zone_55", so
>its implique mapserv knows where to place correctly the shapefiles data.
>But for your raster, you don't have any information about the projection.
>So it can't know in what projection and zone the data has to be. (a
>bounding box exist in each zone, and are just translated from 6° (maybe not
>in your reprojection, i don't know it, but UTM is the same system of 2x60
>zones to define the earth)).
>
>So you can first try to put for each layer in your mapfile
>
>PROJECTION
> "init=epsg:xxxx" #where xxxx is the corresponding identifier of the
>projection (check the share/proj/epsg file to do this) : in your case, it
>is "init=epsg:28355".
>END
>
>to force mapserv to know from where the data comes. It is probably useful
>only for the raster, but try to put again for shapefile in case of it still
>doesn't work. (It always better to add this information in each layer)
>
>I hope i could help you,
>
>sincerely,
>
>Jérôme
>
>Bradley Mclain a écrit :
>>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
>>
>>_________________________________________________________________
>>Advertisement: Fresh jobs daily. Stop waiting for the newspaper. Search
>>Now! www.seek.com.au
>>http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fninemsn%2Eseek%2Ecom%2Eau&_t=757263760&_r=Hotmail_EndText_Dec06&_m=EXT
>>
>>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))
>>
>>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))
>>
>>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
>>
_________________________________________________________________
Advertisement: Fresh jobs daily. Stop waiting for the newspaper. Search now!
www.seek.com.au
http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fninemsn%2Eseek%2Ecom%2Eau&_t=757263760&_r=Hotmail_EndText_Dec06&_m=EXT
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