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From Dirk-Willem van Gulik <di...@webweaving.org>
Subject Re: How get on the map!
Date Sat, 01 Feb 2003 18:19:11 GMT

On Sat, 1 Feb 2003, Santiago Gala wrote:

> I'm not a GIS expert at all, and I'm not sure if I understand. I'm
> currently downloading the jar you pointed us to, to know more.

Essentially the url demo.asemantics.com/wms/asf?request=GetCapabilities
gives you metadata - in there you find that you can get jpegs and png's
and that there is a layer 'comloc'.

You then request lat-lon boxes from a layer as gif or png's. You do
this from several servers; overlay them and present them.

But because each request is a simple URL it is very easy to make
very dynamic web interfaces with little more than <img src="...

> xplanet can be "sliced" to show only parts of the world. So we could
> have a "fixed" imagemap with zones, also generated at a bigger scale, or
> use the xplanet images as background for the WMS map.

Ah nice.

> Ben started rather "static" WRT display. I'm just adding tooltips and
> links to the URLs given.

I saw that. Nice.

> The map1 variant would need to be recalculated to show "true" nigh and
> day, something like once an hour, at least. It also uses "available.gif"

Or have one for each hour (and regenerate them once a month).

> from the apache distribution icons reduced to half size. It could be
> turned to "unavailable.gif" following criteria like jabber presence,
> etc. This would call for a fully dynamic app (rebuilding when a
> committer signs on or off), or at least something that rebuilds every
> few minutes.

Right; we use Secure Dynamic DNS for that inside our company.

> If we want to keep it mostly static, I would say that having a regional
> division where Things would get progressively bigger could be a
> solution. The upper layer could be like map.jpg or map1.jpg is now. For
> inner layers, either the zoom of xplanet or the GIS system could be used:

Ack - WMS also has a feature called 'GetFeatureInfo' which allows you to
query a point.

> Click on Europe (very crowded), then you get only Europe. Ditto for the
> States, Oceania, etc.

Right - that is why I did the WMS interface; so you can zoom into any


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