mapsize

[Frank Lochter]

Hi Steve,
I have a small problem and would like to discuss this here.

1. When I specify a bbox (lat, lon), then the result map should  fit exactly within this
BBox.
2. When I specify a width and height, the result bitmap should have this width and
height.
3. What is when I specify bbox and width and height? Then something is over defined!
    - I assume, the result should exactly fit in the bbox AND the bitmap should fit
exactly in one
      dimension width or height and the other dimension of the bitmap should be
calculated
      on the fly!
- I get something unexpected when the map server extracts the bbox, especially when I
like to integrate the bitmap into an other application and assume, that the bitmap has
the
bbox, that I used to generate it.

Is there any way to get what I assume in 3. !

Sincerely

Frank Lochter

Stephen Lime wrote:

> Yup, the extent is recaclulated based on the shape of the extent and the window
> size/shape. You are gauranteed to see the whole extent plus a bit more. The
> algorithm fits your requested extent in either x or y dimension (whichever fits
> best) and then pads the other dimension as needed. This has to be done in
> order to get the right map to image transformation. You wouldn't necessarily
> have to actually display data outside the actual requested extent but that would
> result in a great deal of blank space in the resulting image, so the computed extent
> is used to select/clip data.
>
> Steve
>
> Stephen Lime
> Internet Applications Analyst
>
> Minnesota DNR
> 500 Lafayette Road
> St. Paul, MN 55155
> 651-297-2937
>
> >>> Ralf Puchert <puchert at gfz-potsdam.de> 03/16/00 10:33AM >>>
> Hello,
>
> When we use
>
> http://130.11.52.178/cgi-bin/mapserv?mode=map&layer=elevation&mapext=
> -180+-10+180+90&map=/var/mapserver/global/global.map&mapsize=500+250
>
> the outputmap has the wrong southernmost latitude.
> It seems to be that something is overdefined.
> Will the produced map whithin geographic coordinates expanded
> to the width and height values of the bitmap or
> will the geographic bounding box be recalculated ?
>
> Sincerely
>
> Ralf Puchert

--
Dr. Frank Lochter
Data Centre
GFZ Potsdam
Telegrafenberg A3
14473 Potsdam
fon. +49-331-288-1701
fax. +49-331-288-1703
url   http://www.gfz-potsdam.de/~marco

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