[Mapserver-users] Newbie Question -- San Francisco map isn't happening

[Gregory S. Williamson]

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I have installed the Mapserver software on a Windows 98 system using =
Apache as a local server (ms363gif_gdal_wms.zip was the source). I =
installed the "Itasca" demo and it works like a charm. I can select =
things, zoom, pan and all is well.

So I set out to create my first working map of San Francisco, CA, USA. =
Right now I have two layers, a shapefile of lines representing streets =
(dervied from TIGER data, turned into continuous polylines in Informix =
Spatial blade, and then unloaded to a shape file. I also have a simple =
layer of 3 points created in ArcView representing points of interest in =
the city.

I created a new directory under Apache2/htdocs and mimiced the structure =
of the "itasca" directory and copied over programs, renaming for my own =
use.

I have a map file (appended). I suspect my problem is in the "EXTENT" =
definition (or the projection?) because when I run it I don't see =
anything; I don't get any errors, I just get a blank image with a scale =
bar, etc.

I am currently without ArcView and only have ArcExplorer, which doesn't =
seem to know projections. The Lat/Long for the area I am looking at is =
approximately
    X              Y                            X =20
 -122.519, 37.8306                  -122.3468, 37.8306


 -122.519, 37.7088                  -122.519, 37.7088

I *think* the EXTENT for this might be approximately:

NAME SSF
STATUS ON
SIZE 600 600
EXTENT 542724.08 4173551.37 557476.48 4187315.33
UNITS METERS
SHAPEPATH "DATA"
IMAGECOLOR 255 255 255
...

I reached these by using ArcView to look at the shape file and the =
chosing the UTM Zone 10N projection (ellipse GRS80) and then copying the =
coordinates it showed.

(I think this is "init=3Depsg:26910")

A typical entry in the log file is:
Fri Jun 20 13:24:19 2003,-98456221,127.0.0.1,SSF,0,542724.080000 =
4173059.623333 557476.480000 4187807.076667,-1.000000 -1.000000,streets =
,normal execution
Fri Jun 20 13:24:41 2003,-779369,127.0.0.1,SSF,0,546141.719333 =
4177139.752089 553517.919333 4184513.478756,549829.819333 =
4180826.615422,streets ,normal execution
...

Any advice -- what I am doing wrong, how to properly determine these =
numbers, etc. -- for this foolish newbie would be most welcome!

TIA,

Greg Williamson
DBA
GlobeXplorer LLC




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