[Geowanking] GeoSkating/GeoSailing : alternative maps needed
arnulf.christl at ccgis.de
Tue Sep 6 02:28:25 PDT 2005
Just van den Broecke wrote:
> Arnulf Christl wrote:
>> more to go... It might be helpful to understand a little about
>> projections, coordinate systems (nothing new to a a sailor) and image
> I am a rather newbie when it comes to GIS, not even a sailor, gradually
>> You can create your own account at the Mapbender Portal, create your
>> own interface and link into many worldwide WMS (including "Demis World
>> Map" and "JPL World Map Service - worldwide satellite imagery").
>> I am interested in how you got your GPS tracks into the map. We are
>> currently thinking of how to best implement a feature to upload and
>> add GPS tracks directly to a standardized WMS server. Probably we will
>> stick to how the OpenStreetMap guys did it, but i believe they still
>> do not have a WFS-T up and running but do it their own way.
> It's rather crude/static now: GPS data + annotations from clients are
> logged into daylog files per user; every half hour (cronjob) a Java
> program draws new maps (3 scales) onto map images if any GPS data was
> added. All other data is in a DB. Media locations are derived from EXIF
> date (email time for movies) by finding the nearest GPS sample in time
> for that user on that day. I am also looking into a more dynamic/layered
> approach. Looked into UMN and PostGIS but also liked the simpler
> approach of OSM.
currently we load GPS tracks directly into the PostgreSQL PostgGIS
database as WKT. Uploading the GPS tracks to a WFS-T would involve
nothing much different, just create a GML from the GPS data - it could
even contain loads of additional information we currently loose using
dumb WKT. Problem are the many different GPS formats. Its a pain, Garmin
right up at the front.
Once in the database every track immediately appears on the map or can
be downloaded as GML. To publish a new GPS track the user needs nothing
but a browser window.
After that a lot of statistical post processing could be done finding
intersections, one-way sections, speed indices, etc. This is where OSM
probably has a lot to tell.
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