[mapserver-users] RE: Combine Layers of Different Unit Systems

[Mike Boone]

Thanks for the info. I'm still having trouble. I've given up on GDAL for
now, and like you said, reprojecting the raster part is overkill. So I have
MS 3.5 with PROJ.4 compiled in, and I have the following mapfile:

# Swamp Trip Map
NAME "SwampTrip"
EXTENT 530250.000000 3716850.000000 549000.000000 3735600.000000
UNITS METERS
SIZE 550 550
SHAPEPATH "/var/www/gis_data/"

PROJECTION
  "proj=utm"
  "datum=NAD27"
  "zone=17"
END

LAYER
  NAME "swamp"
  DATA "o33080f5.tif"
  TYPE RASTER
  STATUS DEFAULT
  PROJECTION
    "proj=utm"
    "datum=NAD27"
    "zone=17"
  END
END # end of layer object

LAYER
  NAME spark
  TYPE LINE
  STATUS DEFAULT
  DATA spark/spark
  PROJECTION
    "proj=latlong"
    "datum=WGS84"
  END
  CLASS
    COLOR 255 0 0
  END # end of class object
END # end of layer object

END # end of map file

The raster file is a USGS TIFF image of the region. It is geotiff encoded.

The 'spark' shapefile was made by downloading a trackline into my Garmin 12
GPS, using Waypoint+ to extract it, and then wayp2shp program to make a
shapefile out of it. It is latitude/longitude data, using the WGS84 datum.

Running shp2img on this mapfile produces the following message:
msProjectRect(): some points failed to reproject, doing internal sampling.

The PNG image produced shows the raster file properly but the trackline is
nowhere to be seen. I run a similar mapfile in a web interface where I zoom
out and I never see the trackline.

Any ideas? Do my projection settings look correct?

In the meantime, I used Photoshop and manually fit my trackline. Here's what
I'm after in MapServer (minus the labels):
http://boonedocks.net/travel/scarolina/images/spark_2001_map_lg.jpg

Thanks for your help. MapServer is a very useful tool.

Mike Boone.

-----Original Message-----
From: Steve Lime [mailto:steve.lime at dnr.state.mn.us]
Sent: Tuesday, January 22, 2002 9:25 AM
Subject: Re: Combine Layers of Different Unit Systems

Hi Mike: You'll need to use the Proj.4 tool. It's more efficient to
reproject the GPS data than to screw around with projecting the raster
data. You don't need to add GDAL or anything else beyond Proj.4. You can
download it from http://www.remotesensing.org/proj.

That's the easiest way...

Steve

Stephen Lime
Data & Applications Manager