[Geowanking] a little coding help

grant at panix.com grant at panix.com
Tue Jan 29 13:47:44 PST 2008


On 1/28/08, Sean Gillies <sgillies at frii.com> wrote:
> David Asbury wrote:
> >
> > I've got a little mashup I've been working on in Google Earth/Maps and
> > I'm stuck. The GE and KML Developer support forums have come up dry so
> > I'm hoping someone here has an idea about how I can work it out.
> >
> > I have created placemarks for several USGS stream gauges in my watershed
> > of interest and linked each placemark's balloon to the webpage of their
> > respective site. On said webpage are GIFs of graphs showing the stream's
> > discharge as recorded by the gauge. These GIFs are dynamically created
> > and update every 15 minutes. So now, everything looks great. Click on
> > the placemark icon, up pops the most recent graph - click on the graph
> > and you're redirected to the main page where you can get a lot more
> > information.
> >
> > The problem is that each GIF's URL is coded with the date, so every 24
> > hours the links to the graphs break. Actually there are two dates in the
> > URL one for the day that the data on the chart begins and a second for
> > when it ends. Like so - <YYYYMMDD..YYYYMMDD>. You can customize the
> > graph from the website to display anywhere from 1 to 31 days of data.
> > The default is 7 days and that's what I'd like to show.
> >
> > So what I need is a bit of script that can either increment the date
> > (and subtract 7 to get the first date) and insert it into a URL, or grab
> > the date from somewhere, format it as YYYMMDD, subtract 7 and create a
> > dynamic URL.
> >
> > I'm guessing scripts won't work within the GE placemark description
> > boxes themselves (though I don't know), so I may need to setup a static
> > link in the placemark to a page where I've created this dynamic image.
> >
> >
>
> David,
>
> Either implement a redirect from "current.gif" to "YYYYMMDD.gif" in the
> web server (mod_rewrite and a perl script, along with appropriate
> caching headers) or make a symbolic link on the filesystem at the time
> the GIF is written.
>
> Cheers,
> Sean
>
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>


-- 

Grant Pezeshki
grant at panix.com
718-857-8729
cell 917-257-3108



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