[Mapserver-users] Reference map to show boundingcoordinates extent not map extent

[John.Hockaday at ga.gov.au]

Steve,

Thanks for this information.  I have finally got around to implementing your
suggestions.  (I've had lots of fires to put out.) ;--)

I have created what I think should work at the following URL:

http://asdd.ga.gov.au/asdd/reference_call.html

I've tried combinations inside my map file:

http://asdd.ga.gov.au/asdd/ref.map

I've looked at your tomo code and tried adding and removing different symbols
but I still keep on getting this following error:

"getDouble(): Symbol definition error. (+):(51)"

It seems that I'm missing something in my map file but for the life of me I
can't work out what it is.

I'd appreciate any help that you or someone else on this list can provide to
fix my problem.

Thanks.


John

> -----Original Message-----
> From: Steve Lime [mailto:steve.lime at dnr.state.mn.us] 
> Sent: Thursday, 5 February 2004 5:05 
> To: Hockaday John; mapserver-users at lists.gis.umn.edu
> Subject: Re: [Mapserver-users] Reference map to show 
> boundingcoordinates extent not map extent
> 
> 
> You can build your reference maps just as a regular map. I've 
> done that
> before. In fact you used to have to if you wanted to do things like
> change the representation of the extent based on scale. 
> 
> The idea goes like this. In a new mapfile
> 
> 1) set the main EXTENT to whatever your reference image is
> 2) set the size to match the reference image
> 3) add the reference image as a raster layer, make sure to 
> set TRANSFORM
> FALSE (this effectively pastes the image in the map)
> 4) create a layer to draw the extent with, the coordinates will be
> supplied dynamically, this might work
> 
> LAYER
>   NAME 'box'
>   TYPE POLYGON
>   STATUS OFF
>   CLASS COLOR 255 0 0 END
> END
> 
> 5) now, in your template make a call to the mapfile, something like:
> 
> http://.../cgi-bin/mapserv?mode=map&map=reference.map&layer=box
> &map_box_feature=new&map_box_feature_points=[rawminx]+[rawminy
> ]+[rawminx]+[rawmaxy]+...
> 
> Basically you do exactly what MapServer does internally in 
> the reference
> map functions, but you force feed it the rectangle of your choice
> dynamically. The reference map on this page is built using this
> approach:
> 
>   http://www.dnr.state.mn.us/maps/tomo.html
> 
> Hope this helps!
> 
> Steve
> 
> 
> >>> <John.Hockaday at ga.gov.au> 02/04/04 11:10 PM >>>
> Hi all,
> 
> I am using cgi mapserv to identify a bounding box which is used to
> define a
> region in another application.  I use JavaScript to allow the user to
> drag a
> bounding box on the [img] and the resulting [rawminx], [rawminy] etc.
> coordinates are sent to mapserv which returns an image zoomed into the
> selected region.  The image size is fixed so there is some area either
> above
> and below or to the left and right of the selected region which is
> outside of
> the area defined by the user.
> 
> Mapserv also returns a reference map and the defined area on that map
> shows
> the extent of the mapserv image but not the extent of the 
> region defined
> by
> the user.
> 
> Are there some parameters that can be sent to a cgi mapserv 
> so that the
> reference map indicates the [rawminx], [rawminy], [rawmaxx] and
> [rawmaxy]
> converted to lats and long instead of the [imgext]?  Or is there some
> other
> way of creating a reference map with the [imgbox] coordinates and not
> the
> [imgext] coordinates?
> 
> Thanks.
> 
> 
> John
> 
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