projection woes
Mark Adams
markadams at CUESTASYS.COM
Tue Jan 25 12:10:45 EST 2005
I've included my map file below.
Regarding Stephen Woodbridge's response, the data in all files is in zone 17, the only difference is the datum; and I can confirm that the data really is there. As I indicated, if I don't include the projection block on the layer the data shows, just shifted because of the different datum. (Also working with it in ArcMap etc.)
If it's likely that that I either don't have the right files, or for some reason they aren't being found, how can I test this, and how do I know which files I need? Incidentally, I installed proj.4 from the proj446_win32_bin.zip distribution; and I'm running on Win2000, IIS 5.
-----map file------
#
# Start of map file
#
MAP
NAME "MVCA_GeoPortal"
STATUS ON
EXTENT 433350 4813769 546722 4889572
SIZE 682 456
#SIZE 674 474
SHAPEPATH "..\Data\Shapefiles"
#TEMPLATEPATTERN "MVCA_GeoPortal"
SYMBOLSET "GeoPortal.symbols"
#fonset added AD 13-Jul-04
FONTSET "GeoPortal.fonts"
#IMAGETYPE PNG
#IMAGETYPE swf
#IMAGETYPE png24bit
IMAGETYPE gif
#IMAGECOLOR 255 255 255
UNITS METERS
OUTPUTFORMAT
NAME gif
DRIVER "GD/GIF"
MIMETYPE "image/gif"
IMAGEMODE PC256
EXTENSION "gif"
TRANSPARENT ON
END
OUTPUTFORMAT
NAME png24bit
DRIVER "GD/PNG"
MIMETYPE "image/png"
IMAGEMODE rgb
FORMATOPTION "INTERLACE=OFF"
END
OUTPUTFORMAT
NAME swf
DRIVER "SWF"
MIMETYPE "application/x-shockwave-flash"
EXTENSION "swf"
IMAGEMODE PC256
FORMATOPTION "OUTPUT_MOVIE=SINGLE"
END
#
# Start of web interface definition (including WMS enabling metadata)
#
WEB
#MINSCALE 500
MAXSCALE 1550000
IMAGEPATH "C:\Inetpub\wwwroot\tmp\"
IMAGEURL "/tmp/"
HEADER "templates/header.html"
FOOTER "templates/footer.html"
TEMPLATE "set in index.html"
METADATA
"WMS_TITLE" "MVCA MapServer GeoPortal"
"WMS_ABSTRACT" "This is MapServer application using data from Maitland Valley Conservation Authority."
"WMS_ACCESSCONSTRAINTS" "none"
"WMS_ONLINERESOURCE" "http://navigator/cgi-bin/mapserv.exe?map=C:\Inetpub\wwwroot\mapserver_demos\MVCA_GeoPortal\config\MVCA_GeoPortal.map&"
"WMS_SRS" "EPSG:26717"
END
END
#
# Start of reference map
#
REFERENCE
IMAGE "reference.png"
EXTENT 433350 4813769 534792 4889572
SIZE 168 118
#SIZE 84 59
STATUS ON
#COLOR 175 175 208
COLOR -1 -1 -1
OUTLINECOLOR 175 175 208
MINBOXSIZE 5
MAXBOXSIZE 500
MARKER "star"
MARKERSIZE 8
END
#
# Projection definition, consult the PROJ.4 documentation for parameter discussion
#
PROJECTION
# proj=utm
# ellps=GRS80
# zone=15
# north
# no_defs
#
# OR:
#
# init=epsg:26915
"init=EPSG:26717"
END
#
# Start of legend
#
LEGEND
STATUS ON
KEYSIZE 18 12
LABEL
TYPE BITMAP
SIZE MEDIUM
COLOR 0 0 89
END
TEMPLATE "legend.html"
END
#
# Start of scalebar
#
SCALEBAR
STATUS ON
POSITION LR
POSTLABELCACHE TRUE
#BACKGROUNDCOLOR 166 202 240
BACKGROUNDCOLOR 254 219 67
COLOR 0 0 156
OUTLINECOLOR 166 202 240
TRANSPARENT ON
#IMAGECOLOR 0 0 0
UNITS KILOMETERS
INTERVALS 4
SIZE 200 8
STYLE 0
LABEL
SIZE SMALL
COLOR 0 0 156
ANTIALIAS TRUE
OUTLINECOLOR 254 219 67
#SHADOWCOLOR 166 202 240
#SHADOWSIZE 3 3
END
END
#
# Start of layer definitions
#
#1
LAYER
NAME "Municipal_Boundaries"
#GROUP "MUNICIPALBOUNDARY"
STATUS ON
DATA "municip_new2001"
TYPE POLYGON
TRANSPARENCY 50
TEMPLATE "null"
LABELITEM "township"
LABELMINSCALE 300000
# LABELANGLEITEM
METADATA
"WMS_TITLE" "Municipal Boundaries MVCA"
"WMS_ABSTRACT" "Depicts Municipal Boundaries in MVCA watershed as of 2001."
"WMS_SRS" "EPSG:26717"
END
CLASS
NAME "Municipal_Boundaries"
LABEL
TYPE truetype
FONT "Arial_bold"
SIZE 8
POSITION CC
COLOR 128 128 64
#ANGLE AUTO
ANTIALIAS TRUE
END
STYLE
#COLOR 247 235 208
SYMBOL 'circle'
OUTLINECOLOR 128 128 64
SIZE 4
END
STYLE
COLOR 247 235 208
OUTLINECOLOR 128 128 64
END
END
END
#9
LAYER
NAME "Urban Areas"
STATUS ON
DATA "mv_builtup_areas"
#DATA "\\Navigator\C\Inetpub\wwwroot\mapserver_demos\MS_GeoPortal\Data\Shapefiles\mv_builtup_areas"
#FILTER ('[name]' =~ /(a|A)(t|T)(W|w)(o|O)(o|O)(d|D)/)
#FILTER ('[name]' = 'Atwood')
TYPE POLYGON
#TRANSPARENCY 50
TOLERANCE 25
TEMPLATE "null"
METADATA
"WMS_TITLE" "Urban Areas in MVCA Watershed"
"WMS_ABSTRACT" "Depicts Urban Areas in the MVCA watershed."
"WMS_SRS" "EPSG:26717"
END
CLASS
NAME "Urban Areas"
STYLE
#COLOR 255 211 127
OUTLINECOLOR 127 127 127
SYMBOL 'circle'
SIZE 2
END
STYLE
COLOR 255 211 127
OUTLINECOLOR 127 127 127
END
END
END
#3
LAYER
NAME "Lot Boundaries"
STATUS OFF
DATA "wlotarea_sort"
TYPE POLYGON
TEMPLATE "null"
#TRANSPARENCY 30
METADATA
"WMS_TITLE" "Whole Lot Boundaries MVCA"
"WMS_ABSTRACT" "Depicts Whole Lot Boundaries in MVCA watershed."
"WMS_SRS" "EPSG:26717"
END
CLASS
NAME "Lot Boundaries"
#MAXSCALE 100000
STYLE
#COLOR 247 235 208
OUTLINECOLOR 104 104 104
#SIZE 3
END
END
END
#5
LAYER
NAME "MVCA Watershed"
STATUS ON
DATA "mv_wthsd"
TYPE POLYGON
#TOLERANCE 25
TEMPLATE "null"
METADATA
"WMS_TITLE" "MVCA Watershed Boundary"
"WMS_ABSTRACT" "Depicts limits of the MVCA watershed."
"WMS_SRS" "EPSG:26717"
END
CLASS
NAME "MVCA Watershed"
STYLE
# COLOR 247 235 208
SIZE 2
OUTLINECOLOR 230 152 0
END
END
END
LAYER
NAME "SVCA Watershed"
STATUS ON
DATA "svca_bnd"
TYPE POLYGON
#TOLERANCE 25
PROJECTION
# "proj=utm"
# "ellps=GRS80"
# "zone=17"
# "north"
# "no_defs"
"init=EPSG:26917"
END
TEMPLATE "null"
METADATA
"WMS_TITLE" "SVCA Watershed Boundary"
"WMS_ABSTRACT" "Depicts limits of the SVCA watershed."
"WMS_SRS" "EPSG:26917"
END
CLASS
NAME "SVCA Watershed"
STYLE
# COLOR 247 235 208
SIZE 2
OUTLINECOLOR 230 152 0
END
END
END
#6
LAYER
NAME "MVCA Subwatersheds"
STATUS OFF
DATA "mv_sub_basins"
TYPE POLYGON
#TOLERANCE 25
TEMPLATE "null"
METADATA
"WMS_TITLE" "MVCA Watershed Boundary"
"WMS_ABSTRACT" "Depicts limits of the MVCA subwatersheds."
"WMS_SRS" "EPSG:26717"
END
CLASS
NAME "MVCA Subwatersheds"
STYLE
# COLOR 247 235 208
OUTLINECOLOR 230 152 0
END
END
END
#16
LAYER
NAME "Roads"
STATUS ON
DATA "wroad"
TYPE LINE
TOLERANCE 25
TEMPLATE "null"
MAXSCALE 300000
METADATA
"WMS_TITLE" "MVCA Roads"
"WMS_ABSTRACT" "MVCA Roads data."
"WMS_SRS" "EPSG:26917"
END
# LABELITEM length
# LABELMAXSCALE 10000
CLASS
NAME "Roads"
STYLE
SYMBOL "circle"
COLOR 0 0 0
SIZE 2
END
# LABEL
# TYPE truetype
# SIZE 8
# FONT "arial"
# SIZE SMALL
# ANGLE AUTO
# POSITION UL
# COLOR 80 180 165
# ANTIALIAS TRUE
# END
END
END
#22
#The query highlighting
QUERYMAP
STATUS ON
STYLE HILITE
COLOR 255 0 128
END
END
------------------------------
Mark Adams
Business & Systems Analyst
Cuesta Systems Inc.
5230 South Service Road
Burlington, ON L7L 5K2
Phone: 905-333-4544 x14
Fax: 905-333-0455
Email: markadams at cuestasys.com
-----Original Message-----
From: Frank Warmerdam [mailto:fwarmerdam at gmail.com]
Sent: Tuesday, January 25, 2005 11:18 AM
To: Mark Adams
Cc: MAPSERVER-USERS at lists.umn.edu
Subject: Re: [UMN_MAPSERVER-USERS] projection woes
On Tue, 25 Jan 2005 10:02:36 -0600, Mark Adams <markadams at cuestasys.com> wrote:
> Hoping someone can help me out with problems I'm having combining data from
> different projections. I have a set of layers in NAD 27 zone 17, which I'm
> displaying with a PROJECTION object set at the MAP level
> with "init=EPSG:26717". I'm trying to add a layer that is in NAD 83 zone
> 17. If I simply add this layer without specifying a PROJECTION, it displays
> fine, albeit out of sync with the underlying data due to the datum shift.
> If I add a PROJECTION object to the LAYER set with "init=EPSG:26917", the
> layer disappears – no error in the log file, just no data. The same thing
> happens if I add a similar PROJECTION object to any other layer – the data
> disappears.
>
> I've gone through the proj installation instructions, I can't see anything
> wrong.
Mark,
For this to work you need datum shifting working. The key to datum shifting
is that at runtime PROJ.4 (used by MapServer) needs to find the NAD27
grid shift files.
Default installs of PROJ.4 don't even include the grid shift files. When they
are present the main one is named "conus" (for Continental US). On unix
it would be found in /usr/local/share/proj by default.
If you have the file, it might still not be found. If this is the
problem then you
need to define the PROJ_LIB environment variable to point to the directory
where the file is located. You likely don't need to do this if your EPSG
lookups are working as the EPSG lookup file is in the same place as the
grid shift files.
If you have all that in place, and things are still not working then it might
be related incomplete coordinate system definitions in one of your
PROJECTION blocks. Is both your UTM 17 NAD27 layer and your map
as a whole defined with init=EPSG:26717? If you emailed me your .map
file I could make a quick inspection that you have complete definitions
everywhere.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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