Using Snapshots as input

[Manfred Meier]

Hi,

if I understand right, you want to compute from time to time a raster 
image from your area with all gps points at this time and after that 
show only the difference set as a shape file?

You could do this with shp2img to create a png or jpeg. If the shown 
extent is the same every time you must only  once produce a world file 
for this.

The problem is that you can not zoom in or out with high quality. 
Perhaps you have to create images and world files for several extents 
and select them with MINSCALE and MAXSCALE.

Manfred




davidvaz schrieb:
> Hello,
> 
> I am developing a GPS logs upload server and I will use mapserver to
> show the covered area of the uploaded GPS logs.
> 
> As I am using shapefiles to store the logs, and I expect to have lots of
> logs, the display of the covered area will become a bit slow.
> 
> My idea was to regularly take a snapshot of the covered area, and use it
> as input, to simplify the processing.
> Is there any way to do this?
> 
> Thanks in advance,
> 
> David Vaz
>