projection issue...

[John Cole]

Aaron,
  Thanks! I didn't see one that existed for feet, but I'll look again.  I'll
also try your projection definition too.  I was able to put together one
that seemed to work ok, but I really was guessing at a few things.

PROJECTION
	"+proj=tmerc" #projection name
	"+ellps=GRS80" #aka spheroid
	"+lat_0=30" #lat of false origin
	"+lon_0=-87.5" #lon of false origin
	#"+x_0=1968500" #false origin easting
	"+x_0=599999.9999999999952" #false origin easting
	"+y_0=0" #false origin northin
	"+datum=NAD83"
	"+k=0.9999333333333333"
	"+units=ft"
END

Thanks everyone, I'm lined up pretty close now ;-)

John Cole

-----Original Message-----
From: Aaron Racicot [mailto:aaronr at ecotrust.org] 
Sent: Wednesday, August 17, 2005 4:11 PM
To: John Cole; MAPSERVER-USERS at LISTS.UMN.EDU
Subject: RE: [UMN_MAPSERVER-USERS] projection issue...

John,

In the esri definition file with PROJ.4 (my version at least) the code
does exist (in feet).  I have never tried to use these esri codes, so
you can try to use it directly or just define your own using the same
parameters:

# NAD 1983 StatePlane Alabama West FIPS 0102 Feet
<102630> +proj=tmerc +lat_0=30 +lon_0=-87.5 +k=0.999933
+x_0=600000.0000000001 +y_0=0 +ellps=GRS80 +datum=NAD83
+to_meter=0.3048006096012192  no_defs <>

Trying to define your own in a mapfile might look like:

PROJECTION
  "proj=tmerc"
  "lat_0=30"
  "lon_0=-87.5"
  "k=0.999933"
  "x_0=600000.0000000001"
  "y_0=0"
  "ellps=GRS80"
  "datum=NAD83"
  "to_meter=0.3048006096012192"
  "no_defs"
END

Hope this helps...

Aaron

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| Aaron Racicot  | aaronr at ecotrust.org   |
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-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of John Cole
Sent: Wednesday, August 17, 2005 1:41 PM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: [UMN_MAPSERVER-USERS] projection issue...


Thanks to everyone helping me to find the EPSG code, I was able to find
both the esri and epsg file in the proj directory.

Unfortunately, I had the epsg code correct (I was hoping it was wrong,
because the projection isn't working).  I'm trying to get a shapefile of
the Midwest states to work with a projected tiger county (epsg:26930).
I'm including the prj file for both the states and my county, along with
a mapfile and an image of what I'm getting.

I've been reading and searching, and I thought this should work, but my
north Alabama county is winding up in Maine.

Any help would be appreciated.

Thanks,

John Cole


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