[mapserver-users] hints wanted

[Matthew Hatcher]

Marian,

Good news: Mapserver can do what you want!

Shapefiles are vector data - point, line and polygon co-ordinates. They are
different from rasters (images - like JPGs) so they are not essential.

What you need to create is a 'world file' for each of your JPGS to reference
it your chosen co-ordinate system. World files are described in the
Mapserver HOWTO for rasters, but basically use:

X pixel size in your co-ordinate system
0.0
0.0
Y pixel size in your co-ordinate system (usually minus if the origin is
top-left)
X co-ordinate of top-left
Y co-ordinate of top-left

So if your map top-left is at 100,100 in your co-ordinates and each pixel
represents 5 meters then use:

5.0
0.0
0.0
-5.0
100.0
100.0

Create this as a text file - just those six lines - and save it with the
same filename as the JPG but a .WLD or .JGW extension.

Then use a very simple map file like the one below. You could add 'MINSCALE'
and 'MAXSCALE' properties if you want to set one or other so they only
appear at a given scale, perhaps.

I hope this gives you some pointers. Good luck with Mapserver!

Matt Hatcher.

---- map.map ----
NAME MAP
STATUS ON
SIZE 600 350					# set size of output image
UNITS METERS
SHAPEPATH "data"
IMAGECOLOR 255 255 255			# set background colour of image
IMAGETYPE jpeg
IMAGEQUALITY 100				# only appropriate for jpeg
output

#
# Projection definition
#
PROJECTION
  "init=epsg:4326"				# set this to whatever,
maybe just 'geographic'
END

#
# Start of web interface definition
#
WEB
  TEMPLATE template.html
  IMAGEPATH "d:\Inetpub\wwwroot\tmp\"
  IMAGEURL "/tmp/"
  METADATA
    WMS_TITLE "title"
    WMS_ABSTRACT "abstract"
    WMS_ACCESSCONSTRAINTS none

    # change this value to match your setup
    WMS_ONLINERESOURCE "http://localhost"

    WMS_SRS "EPSG:4326"
  END
END

#
# Layers
#
LAYER
  NAME "map1"
  TYPE RASTER
  STATUS OFF
  DATA "map1.jpg"

  CLASS
   NAME "Map1"
  END

END

LAYER
  NAME "map2"
  TYPE RASTER
  STATUS OFF
  DATA "map2.jpg"

  CLASS
   NAME "Map2"
  END


END # Map File


-----Original Message-----
From: Marian Grigoras [mailto:marian.grigoras at mchp.siemens.de]
Sent: 21 August 2002 10:01
To: mapserver-users at lists.gis.umn.edu
Subject: [mapserver-users] hints wanted


Hello,

I am a new user of MapServer. I managed to run the demo and made a few
easy programs by myself using the tutorial data.
I want to configure a very simple map server that uses JPG (GIF or other
image file), but I do not have the maps in shapefile format. I only need
to specify they position relative to one another, or relative to a
general coordinate system, no matter which one it is (what I mean is
that I need the map server running on a campus level, so I do not care
for global lat/lon coordinates or similar). Basically I would like to be
able to toggle between 2 maps (JPGs) according to the zoom level and do
some cropping on the selected map.
MapServer looks great, but (there had to be a BUT :-) ) unfortunately I
do not have time to invest 1 week in parsing the tutorial and the whole
documentation just to find out that MapServer cannot handle this case
(in 1 week I could write a small server by my own).
So could someone more experienced:
- at least tell me if MapServer could handle my application,
- at most :-) give some hints on the easiest way to implement this
(REFERENCE maps or something else)

Sorry if this looks trivial, but I need some information fast.
Thanks a lot.

Marian Grigoras



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