[Talk-ca] Geogratis vs. GeoBase

[Michel Gilbert]

2008/12/9 Brent Fraser <bfraser at geoanalytic.com>

>
>
> Sam Vekemans wrote:
> > Well then if thats the case, then i think that we need to fix up the
> > wiki page to reflect that. .. and state that GeoBase is 'Natural
> > Resources Canada' which IS the GeoGratis website portal showing the
> > other sites. ... (Gosh this government is confusing ;) ..  aargh! ...
> >
>
> Then I won't mention the CTIS site (http://www.cits.rncan.gc.ca/)!  (and
> no, there's no free data there (well almost none), only information)
>
> Here's my [limited] understanding:
>
> GeoGratis  - "data storage" web site for Federal NRCan Earth Sciences
> Sector free data distribution.
> CTIS       - The Federal agency responsible for topographic mapping (part
> of Earth Sciences Sector).
> GeoBase    - "data storage" web site by Federal/Prov/Terr agencies to
> distribute free topographic data
>                For some reason (historical?, organizational?, disk space?)
> it does not include the Federal NTS map vector data (at Geogratis) , but it
> does include NTS digital elevation models.  Go figure.
>
> CTIS is (or was) the producer of NTDB. When the no cost policy went on,
they move the distribution to the NRCan/ESS portal Geogratis. Then CTIS
started the vector data line CanVec which is a fusion of NDTB updated (some)
and GeoBase distributed by NTS tiles. Physically, NTDB, CanVec, Geobase
products are managed at CTIS.

If you do not see CanVec or other vector data on Geobase is because Geobase
is not only federal initiative. Provinces and Territories are part of the
parternship. The data on Geobase came from agreements between the partners.
Agreements are possible went they meet the Geobase principiles of quality
and update cycle. You will see new Geobase products in the next years.
They'll become available as the current ones.

Michel


>
>
> > Or perhaps im not getting it. .. Can we explain;
> >
> > 1 Where exactly the data in the Ibycus topo came from.  (if it was a big
> > set and split up, or how it was done)
>
> Likely CanVec or it's predecessor, NTDB.
>
> >
> > 2 If everything on the Ibycus Topo is now 'old'  ... how to we find the
> > new stuff??
>
> CanVec
>
> >
> > 3. What's this Atlas of Canada
> > <http://atlas.nrcan.gc.ca/site/english/maps/topo/map>thing? why cant i
> > download anything from that page?
>
> A web mapping site (not a data download site) for viewing CanVec/NTDB.
>  Created before CanVec/NTDB was freed.
>
> Best Regards,
> Brent Fraser
> GeoAnalytic Inc.
>
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