Front Range Users of Geospatial Open Source Google Group

FOSS4G-NA (North America) February 2011 in Quebec City ?

2009-12-24T06:27:24Z

It looks like that is the plan: [link] <[link]> &from=rss
Karsten

Looking for Geospatial Open Source Development Experience

2009-11-23T02:23:56Z

I am interested in making contact with people interested in developing
cutting edge geospatial applications for 3D Earth browsers in the
Colorado Springs area. The work would require experience and
expertise in the following general areas:

- 4+ years of C# programming experience.
- Experience with the ESRI product line

Re: polygon topology using FOSS tools

2009-11-04T18:10:49Z

Dane & Chris:

I played with MapShaper for a few minutes and it seems it does
preserve topology if the input file is "clean".

Which gets me halfway home; I still need something to clean-up an
original set of polygons that may be messy.

MapShaper is definitely impressive.

Re: polygon topology using FOSS tools

2009-11-04T17:58:59Z

Ya, mapshaper is pretty amazing. I think mapshaper builds its own
topology serverside so that it can correctly handle shared boundaries
between adjacent polygons when generalizing and uses an enhanced
version of the VW (Visvalingam-Whyatt) algorithm. Some info related
to the general VW algorithm here: [link]

Re: polygon topology using FOSS tools

2009-11-04T15:55:57Z

Okay - this is one of our newly discovered tools that we've been simplify a
lot of data with for our KML files. Its easy to use: import your shapefile,
use the slider to adjust the transparency, and export the data. Presto, a
simplified shapefile. Honestly I have no idea how its handles topology...

polygon topology using FOSS tools

2009-11-04T14:54:01Z

Esteemed Members of The List:

I'm in the market for a FOSS workflow that replicates the "CLEAN" and
"BUILD" functionality of old ArcInfo to resolve gaps and overlaps in a
polygon layer.

The use case is that I need to aggressively simplify a variety of
polygon datasets. While your garden variety Douglas-Peucker method

RE: heads up on planet osm as a public AWS data set

2009-10-29T16:29:01Z

Yes there is a bit of discussion on the topic here:
[link]

Don't know if a regular update will actually transpire. It has only been
available since 10/9/2009

Still it beats decennial TIGER updates by years and USGS DLG by decades :)

Re: heads up on planet osm as a public AWS data set

2009-10-29T16:23:04Z

Interesting. I wonder how often they (whoever created this AWS
dataset) plan on syncing it with the master OSM database. Hopefully
they plan on weekly or more frequent updates, otherwise it won't be
particularly useful since OSM data changes so rapidly.

- Tyler

RE: heads up on planet osm as a public AWS data set

2009-10-29T15:52:54Z

Just a heads up on something interesting:
[link]

It's a complete Open Street Map dump as an Amazon EBS PostGIS DB, meaning
you can start an EC2 instance with PostGIS, mount this AWS public data EBS,
run pg_createcluster, and away you go just like Google!

RE: WMS performance shootout results

2009-10-28T14:41:07Z

I had heard that about Oracle as well. Not sure if it is just legend, but it
doesn't seem contrary to the Oracle persona.

Maybe Oracle could send some of their people to Barcelona to tweak the
Oracle benchmark.
Interesting to see Amazon RDS built on MySQL which is an Oracle/SUN open
source? I still haven't figured how open source can be owned?

Re: WMS performance shootout results

2009-10-28T14:06:17Z

I had heard that ESRI dropped out due to 'lack of resources' which may
have been a valid reason since they announced that they would join in
the shootout rather late in the game. On the other hand, Andrea and
Jeff said they ran their benchmark tests on weekends during the month
prior to FOSS4G, so maybe it is more of a comparison of how willing

RE: WMS performance shootout results

2009-10-27T16:23:00Z

Too bad ESRI didn't stay in the shootout.

"PostGIS performs roughly 5% better than Oracle on higher loads"
"SDE seems to introduce no overhead compared to direct Oracle access for
GeoServer, and slight overhead for MapServer"

Looks like putting PostGIS behind SDE could offer an improvement and putting

Re: WMS performance shootout results

2009-10-27T15:30:06Z

Mike -

Great content! Thanks to all who made the effort in this activity. I
will be sharing with the OGC.

Regards

Carl

WMS performance shootout results

2009-10-26T15:39:30Z

Hello list.
I thought people would be interested in the results from the WMS performance
shootout that occurred at FOSS4g2009 in Sydney this past week.
Originally was supposed to be AGS v Geoserver v Mapserver but ESRI dropped
out at the last minute.
Results:
[link]
Cheers,
Mike Tafel

Re: CGP AAG 2010: Open Source Tools and Standards in GISc Research and Education

2009-10-15T16:40:48Z

Sean,
The cross-posting, I felt, wasn't egregious. It was a CFP that hadn't hit
the appropriate lists and the submission deadline was coming up fast. I also
think that the internet has become much more specialized - so cross posting
on lists is almost necessary. It just happens that you are one of the few in