[Freegis-list] FREEMAP

[Jan-Oliver Wagner]

On Fri, May 19, 2000 at 10:36:42AM -0700, Adrian Vance Custer wrote:
> Hey here's another discussion we need to have. How do we set up a suitable
> stucture so that we can slowly map the world with GPS. This is tied to
> gis but is really about metatdata and components.

Good comment. I also have spend some time thinking on how this
can be supported at a technical level and what method
of quality assurance could be used.

> I have GPS'ed the most accurate map in the world of a tiny little area of
> Africa (Pawe Special Woreda, Metekel Zone, Benishangul-Gumuz National Regional
> State, Ethiopia or 36degEast 11degNorth). For anyone else to use it though they have to:
> - believe me
> or
> - be able to check me (e.g. many returns to same spot of different days; survey
> of a known spot...)
> or
> - use my data until they get something better and then replace my data.

Can you release these data as Free Data and put ir on the web?

> The free gis community needs to come up with a well documented way of building
> up data sets from many disparate pieces and being able to cross check the
> pieces and discard those that don't fit or update pieces with newer ones. I'm
> thinking of a cvs of gps data or some such thing.
> 
> IS IT POSSIBLE?

My answer is YES, but we need to elaborate many further methods. We can not
know them all right now, so in principle, we should start anyway with collecting
some (yet unlinked) GI datasets.

What we highly will depend on to have clear quality definitions are trust
metrics for data. This might remind on technologies applied with CVS, but
what we need goes much farther. Trust metrics express a level acceptability
of data derived from expert judgement, applied sampling method, stability of
reporting, trust level of authors and perhaps some more.
The trust metrics must work in a self-organising way.

What do you think?


Jan

-- 
Jan-Oliver Wagner				http://intevation.de/~jan/

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