Projection and EXTENTS

[Matthew Roberson]

Bart,

I'm not a projection expert either (obviously).  I didn't convert my
shapefile to that projection, and it's quite possible that EPSG 26797
is not correct for my map. I will look into that.  Thanks for your
help.

Matt
On May 10, 2005, at 2:11 AM, Bart van den Eijnden wrote:

> Hi,
>
> I am no projection expert but I can imagine your shapefile isn't in
> EPSG 26797 (or did convert your shapefile to that projection). The
> LAYER PROJECTION should have the source projection of the data in it,
> the MAP PROJECTION should contain the target projection you want.
>
> Best regards,
> Bart
>
> Bart van den Eijnden
> Syncera-ITSolutions
> Postbus 270
> 2600 AG  DELFT
>
> tel.nr.: 015-7512436
> email: BEN at Syncera-ITSolutions.nl
>
>>>> Matthew Roberson <matt at MSILEADS.COM> 05/10/05 12:18am >>>
> 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
>