[postgis-users] user map on Postgres web site
rkgeorge at cadmaps.com
Wed Oct 26 18:32:23 PDT 2005
Another possibility is an OGC WMS/WFS service on top of PostGIS
using GeoServer http://geoserver.sourceforge.net/html/index.php GNU license
There are quite a few public WMS resources available currently that
could be merged with locations and output as png, jpg, or svg image formats.
TerraServer(DOQQ,DRG), USGS(NED,LandSat,Urban), NOAA ENC, SEACOOS, NASA, and
JPL.... I am not sure how much detail is available outside the USA though.
That's one reason for the popularity of Google map/images, free homogeneous
world coverage. Unfortunately GoogleMaps is somewhat restrictive in use
terms and is a non-standard service which prevents some interesting
applications(limited to using their api).
We are still waiting on a Census TIGER WFS service that would make
nice street background with a WFS chain.
An OGC WFS/WMS http output has the advantage of allowing diverse
client viewers, such as SVG, uDig, Jump, ...
An interesting project.
Would the ip locations/addresses be available to batch run through
geocoder.us? How many records are involved? The last I checked geocoder.usa
was 10-15 sec per address.
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Brent
Sent: Wednesday, October 26, 2005 3:53 PM
To: MAPSERVER-USERS at LISTS.UMN.EDU; postgis-users at postgis.refractions.net;
freegis-list at intevation.de
Subject: [postgis-users] user map on Postgres web site
I guess I should apologise for the cross posting, I know this is gonna get
to lots of people more than once, but hopefully it will be of enough
interest that you'll at least read one of them :-)
There has recently been a thread on the Postgres user list about a web
based postgres user/developer map. Claire has built a Google map based
system, getting locations from IP addresses.
I suggested a fully Open Source based system might be appropriate, and
could even be a OS GIS suite showcase (applications and global raster
& vector data) if anyone wanted to take it that far.
Postgres/Postgis/mapserver seems the obvious mix, though I admit it
is not the only one. ka-map could also fit in there... as well as plenty
of other OS web-mapping related packages.
A small minority of Postgres users seem to use spatial data, and this
could present & foster a Postgres based solution for anyone interested in
adding location functionality to existing Postgres implementations.
So, is anyone out there in OS GIS world interested in becoming part of a
team to help put this together?
On Wed, 26 Oct 2005, Claire McLister wrote:
> I took a look at your map, this is great wonderful that you were
> already thinking along these lines.
> Looks like there are two issues here: (1) Getting the data points for
> users/developers maps, and (2) using the most appropriate mapping
> I think we can use the Zeemaps service (http://www.zeemaps.com) for
> number (1) above. The way this works is that you create a map and set a
> few passwords: (a) moderator, (b) member, and (c) viewer. Using the
> moderator password, you can set certain map properties, e.g.,
> attributes to maintain with each entry, color legends, etc. With a
> member password you can modify entries and their attributes, and with a
> viewer password you can just see details without the ability to modify
> anything. A casual user can just see the map with the markers and their
> names, without access to any details for the entries. Hence
> distributing the member password to the group and having each person
> add his or her details would be a good way to go. The number of points
> for Postgresql users can, of course, go pretty high. So far, we have
> seen reasonable performance with up to 500-600 markers. I don't know if
> there is an easy way of partitioning the user base into segments that
> can fit within this range. Another idea would be to just split the map
> after say 500 points.
> For the number (2) the choice seems to be between Google Maps vs.
> Mapserver and its associated Open Source tools. Having looked at
> Brent's follow up emails, it seems that Mapserver and associated
> toolkits can give much more flexibility. Plus they have the advantage
> that we are not limited by Google's terms, the most annoying of which
> is that you cannot save, copy, or distribute the map images created.
> So, it seems best to move towards the Open Source alternatives,
> specially since they have better images as Brent points out. I've been
> looking at some of the Mapserver toolkits, and there seems to be an
> overwhelming amount of choice available for what to pick and not. So, I
> don't feel qualified to pick the right technologies to use for the base
> implementation. If someone can pick the mantle on that, I'd be happy to
> work with that person to see how we can exchange information from the
> map points stored from (1). If for the time being you feel comfortable
> continuing with Google Maps, then there's multiple ways we can share
> information developed by (1) through some kind of a web service API.
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