[Mapserver-users] GPS data Projection

[Pericles S. Nacionales]

Changqing,

Add this under your MAP object (replace the projection info that's in
there now:
PROJECTION
  # This is the projection definition for UTM Zone 15N, datum is NAD83,
  # and ellipsoid/spheroid is GRS80.
  "init=epsg:26915"
END

This is your output projection.

Next, add your gps layer and add a PROJECTION object under it, like
this:
LAYER # GPS Data
  NAME         gps_pts
  DATA         gps
  STATUS       DEFAULT
  TYPE         POINT
  
  PROJECTION
    # This is the projection definition for the GPS data in lat/long,
    # datum is NAD83, ellipse/spheroid is GRS80
    "init=epsg:4269"
  END
... <CLASS defs follow> ...
END

This is your input projection.

Good luck!
-Perry

On Sun, 2004-04-25 at 23:19, Changqing Zhou wrote:
> HI, I would greatly appreaciate your help on a projection question:
> 
> How do I display gps data in lat-long point format on top of the following
> MNDOT base road shapefile? How to project the GPS data to the road map system?
> 
> (http://www.dot.state.mn.us/tda/basemap/metadata/Roads.htm)
> 
> Horizontal Coordinate Scheme  UTM
> Ellipsoid  GRS80
> Horizontal Datum  NAD83
> Horizontal Units  Meters
> 
> Below is my simplified maplefile. Note I do not use any projections:
> 
> MAP
>   NAME           Hennepin County
>   IMAGETYPE      png
>   #EXTENT         201621.496941 -294488.285333 1425518.020722
> 498254.511514 # LAEA
>   EXTENT		439000 4960000 487000 5010000 #from arcview
>   #EXTENT         -97.5 41.619778 -82.122902 49.38562 # Geographic
>   SIZE           800 600
>   SHAPEPATH      "data"
>   SYMBOLSET      "symbols/symbols35.sym"
>   FONTSET        "fonts/fonts.list"
> 
>   WEB
>     TEMPLATE  'hennepinRoads.html'
>     IMAGEPATH '/ApacheGroup/Apache2/htdocs/tmp/'
>     IMAGEURL  '/tmp/'
>   END
> 
>   PROJECTION
>   # This is Lambert Azimuthal Equal-Area projection for the
>   # Continental U.S.
>   #  "proj=laea"
>   #  "ellps=clrk66"
>   #  "lat_0=45"
>   #  "lon_0=-100"
>   #
>   # Alternatively, you can specify an EPSG code.
>   # This is the EPSG code for
>   # Lambert Azimuthal Equal-Area projection for the U.S.
>   #"init=epsg:2163"
>   #
>   END
> 
> LAYER # Hennepin Road layer begins here
>   NAME         hennepin_line
>   DATA         hennepinm
>   STATUS       DEFAULT
>   TYPE         LINE
> 
> #  PROJECTION
> #    "init=epsg:4326"
> #  END
> 
>   CLASSITEM "Code"
>   CLASS
>       EXPRESSION '01'
>       COLOR 0 0 255
>   END
>   CLASS
>       EXPRESSION '02'
>       COLOR 0 0 255
>   END
>   CLASS
>       EXPRESSION '03'
>       COLOR 255 0 0
>   END
>   CLASS
>       EXPRESSION '04'
>       COLOR 0 255 255
>   END
> 
> END # Hennepin Roads layer ends here
> 
> 
>   # End of LAYER DEFINITIONS -------------------------------
> 
> END # end of map file
> 
> 
> Thanks,
> 
> Changqing
> 
> 
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