Projection and EXTENTS
Matthew Roberson
matt at MSILEADS.COM
Mon May 9 15:18:46 PDT 2005
I am trying to create a projection a map of the state of Missouri that
was created by the US Census Bureau(zt29_d00.shp).
I used ogrinfo to get the following information about the EXTENT:
[imac-dev03:~/Documents] matthewr% ogrinfo -so zt29_d00.shp zt29_d00
INFO: Open of `zt29_d00.shp'
using driver `ESRI Shapefile' successful.
Layer name: zt29_d00
Geometry: Polygon
Feature Count: 1341
Extent: (-95.774704, 35.995683) - (-89.098843, 40.613640)
Layer SRS WKT:
(unknown)
AREA: Real (20.5)
PERIMETER: Real (20.5)
ZT29_D00_: Integer (11.0)
ZT29_D00_I: Integer (11.0)
ZCTA: String (5.0)
NAME: String (90.0)
LSAD: String (2.0)
LSAD_TRANS: String (50.0)
Then, I used proj4 to find lat long values for the a Lambert Azimuthal
Equal Area projection.
[imac-dev03:~/Documents] matthewr% proj +proj=laea +ellps=clrk66 +R_A
-95.774704 35.995683
-7567149.62 5525023.18
-89.098843 40.613640
-6798293.00 5830370.88
When I use these values with MapServer to make a map, nothing shows up.
Am I missing something. Should I post this question in this list or
in the MapServer User's group? Any help would be appreciated.
Below is copy of my map file also,
MAP
NAME MO
IMAGETYPE GIF
SIZE 6000 6000
IMAGECOLOR 240 240 240
SHAPEPATH "/Library/WebServer/Documents/data"
FONTSET "/Library/fonts/fonts.list"
EXTENT -7567149.62 5525023.18 -6798293.00 5830370.88
UNITS METERS
WEB
IMAGEPATH "/Library/WebServer/Documents/test/"
IMAGEURL "/test/"
END
PROJECTION
"init=epsg:26797"
END
LEGEND
STATUS EMBED
POSITION UR
END
SCALEBAR
TRANSPARENT ON
BACKGROUNDCOLOR 254 254 254
STATUS EMBED
POSITION LR
STYLE 1
END
LAYER
NAME "MO zip code boundaries"
DATA "zt29_d00"
STATUS DEFAULT
TYPE POLYGON
PROJECTION
"init=epsg:26797"
END
LABELITEM "ZCTA"
CLASS
COLOR 254 0 0
LABEL
COLOR 60 60 60
SHADOWCOLOR 218 218 218
SHADOWSIZE 1 1
TYPE TRUETYPE
FONT arialhb
SIZE 10
ANTIALIAS TRUE
POSITION CL
PARTIALS FALSE
MINDISTANCE 5
BUFFER 4
END
OUTLINECOLOR 60 60 60
SYMBOL 0
END
END
LAYER
NAME "credits"
STATUS DEFAULT
TRANSFORM FALSE
TYPE ANNOTATION
FEATURE
POINTS
10 680
END
TEXT 'Made with Mapserver.'
END
CLASS
LABEL
TYPE BITMAP
POSITION CR
COLOR 0 0 0
END
END
END
END
Thanks,
Matt
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