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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: GISList: Best format for big data ? |
| Date: |
08/26/2002 01:39:48 PM |
| From: |
Dave McIlhagga |
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Hi Stephanie,
In terms of free tools that allow you to show large datasets (as
shapefiles) quickly, you might want to take a look at the MapServer Open
Source product from the University of Minnesota:
http://mapserver.gis.umn.edu
This uses a tiling system that allows for rapid access to large amounts
of data stored in flat files (such as shapefiles). As a reference, we
have a client who is generating 100,000 maps a day from a 15 gigabyte
dataset all stored in shapefiles with a very satisfactory response time
(approx. 1 second per map).
If you have any questions about MapServer, there is also a very active
mailing list that can help you out.
Dave
--
Dave McIlhagga
President, DM Solutions Group
http://www.dmsolutions.ca
EMail : mcilhagga@dmsolutions.ca
Phone : 613-565-5056
Fax : 613-565-0925
Stephanie Planche wrote:
>
> Hi list,
>
> I looked for a world map, free for commercial usage. I got the one from NIMA
> on VMAP0 format. I need only the boundaries and the administrative
> subdivisions in the countries.To display the maps and interact with it, I
> looked some java tools from open source projects and I found ones working
> with ESRI shapefile format. So I converted my map from VMAP0 to shapefile
> using the VPF Importer from NIMA.
> I got a shapefile which is about 4 megs, just to draw the world and the
> countries.
>
> Now this is my problem : the display of the map is too much slow.
> I must be able to display the world map quickly, and this with free tools
> only :-( Until now to interact and to display the map, I tested Geotools and
> OpenMap, which were good until I tested them with big data. Geotools works
> with shapefile. OpenMap accepts several formats : DCW, VPF, VMAP, CADRG,
> CIB, RPF, DTED and MapInfo.
>
> So I would like to know :
>
> - is it possible to get a smaller shapefile from the world with political
> boundaries by converting VMAP0 with other softs or by using an other source
> than the VMAP0 map from NIMA ?
>
> - are there better formats than shapefile to deal with big data in general ?
>
> I'm confused between looking for another world map in shapefile format, or
> chosing another format or chosing other softs to interact with my map.
>
> Thanks a lot for your help and your advices.
>
> Stephanie.
>
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