[postgis-users] Client/Web based GIS using PostGIS

Thu May 25 09:23:46 PDT 2006

Hi Shaun

You are quite write in that the maturity of the geoOSS is now rivaling
commercial software.

we have worked on developing a 3 tier application (PostGIS <-->
Geoserver <--> Mapbuilder) for recording incidents and hazards for a
client. you can find some demo screen captures here:
http://lifesaver.vpac.org/videos.html

I you are interested let me know and we might be able to get you a
temp user account.

regards
shoaib
http://geospatial.nomad-labs.com

On 5/26/06, Bruce Rindahl <rindahl at lrcwe.com> wrote:
> Shaun,
> I have also developed WMS/SVG applications similar to what you are talking
> about.  I think this is a very powerful way to go.  The really nice thing
> about PostGIS is it can be set up to be very fast and minimal bandwidth with
> some careful planning.
> If you are interested, first go to http://www.carto.net
> There are lots of examples and tutorials there.
> There is also a web site I developed for a municipal client based on the
> work done at carto.net that you can view at
> http://www.udfcd.org/svg/svg_mapping.htm
> All these examples work on IE+ASV, Firefox, Opera 9 (beta), Batik and Safari
> (I think - don't have a Mac).  If the application were scaled back a bit it
> might start working on a Mobile using Opera.
>
> I am also in the process of developing some digitizing via script/SVG.  Not
> ready yet but I can keep you posted.
> Bruce Rindahl
>
> -----Original Message-----
> From: postgis-users-bounces at postgis.refractions.net
> [mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Randy
> George
> Sent: Wednesday, May 24, 2006 9:38 PM
> To: 'PostGIS Users Discussion'
> Subject: RE: [postgis-users] Client/Web based GIS using PostGIS
>
>
> Hi Shaun,
>
>         I have used svg as a client to public WMS/WFS services. It works
> well where there is access to an svg renderer in the browser with decent
> javascript capability. IE+ASV is still the best although FireFox with its
> native svg rendering may soon be just as good.
>         It may be a bit iffy on PocketPC although there are some SVG Tiny
> and SVG Basic implementations that might work at that level. I don't think
> local draw and upload to the backing datastore could be done with SVG Tiny,
> perhaps Basic?
>
>         I have doubts about 512/128 though for anything but a very simple
> svg wrapping jpg image elements.
>
>         A WMS server like GeoServer (open source) can provide static
> background as an <image> element. SVG javascripting can provide the draw
> capability you described. If you set up the GeoServer as a WFS-T the client
> drawn elements can be pushed back to the PostGIS datastore. GeoServer also
> has shp export (doesn't always work) capability and can serve data from
> ArcSDE (not as well supported as PostGIS) Nice thing with OWS too is that
> there are a number of public services that could be optionally stacked onto
> the client as background. JPL, NOAA, USGS National Atlas ... You just want
> to keep the pixel width and height optimized for the low bandwidth and
> transparent image stacks won't work unless you use png which are always
> larger than jpg.
>
>         As far as caching it just depends how much you want to do on the
> client. If the <image> element is entirely static i.e. no zoom and pan from
> the WMS server you can just href the preset image from a local file
> location. As an SVG image element you still have some zoom and pan within
> the limits of the image. It might be interesting to look at a small tile set
> for a local pan capability.
>         If it is more complex you could of course setup a local service on
> the client, but that would be a lot of work for anything more than 1 or 2
> clients. You would need to install:
> Apache Tomcat + PostgreSQL/PostGIS + GeoServer + datastores as well as the
> client browser stuff for svg.
>
> Obviously not possible on a handheld of any kind.
>
> Randy
>
> -----Original Message-----
> From: postgis-users-bounces at postgis.refractions.net
> [mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Shaun
> Kolomeitz
> Sent: Wednesday, May 24, 2006 5:39 PM
> To: postgis-users at postgis.refractions.net
> Cc: Shaun Kolomeitz
> Subject: [postgis-users] Client/Web based GIS using PostGIS
>
>
> I wonder if I could pose some questions please for some collective
> advice/directions?
>
> I'd like to set-up a situation where remote sites (over 50 on a poor 512/128
> satellite connection, many more on ADSL or WAN) can add and view
> spatial/non-spatial data using some form of web-client or a relatively
> "low-fat" / customisable  (desktop) client. The user will need to see some
> background (raster and vector) data and be able to digitise on-screen as
> well as import shapefiles (usually converted from Garmin GPS data). In terms
> of getting over the crappy upload/download is there a way I could use a
> "cache" concept where locally used data can be downloaded to the client and
> new data uploaded (overnight or on the weekend ?) when the connection is not
> being used for other purposes ??? I'd like to bring in handheld (PocketPC)
> clients as well, but I suspect this may be more difficult.
>
> The requirements are pretty straightforward (?) - allow users to add spatial
> data (points, lines and polygons), pop-up some standard forms based on the
> type of feature they are adding (a fire boundary, a pest or weed location or
> distribution, a monitoring site etc), allow users to upload photo point (and
> other) images to the server, provide hot-links to non-spatial data (Word
> docs, HTML pages etc). Typically we try to walk before we can run and like
> to start with something simple and easy to use and build on it from there
> (taking the users with us, rather than dumping them into the deep end of a
> complicated and intricate process). Can I use PostGres/PostGIS to store,
> retrieve and display georectified and non-spatial images ?
>
> I've set-up PostGRES/PostGIS and have tested uDIG (which looks fantastic
> BTW) as well as Quantam GIS (which allows me to update PostGIS), but I'm
> also keen on "thin" (web-ish?) approaches like perhaps having an SVG window
> (what is better/best ?) for update purposes. I assume I can get away with a
> WMS (image) for "displaying" data, but would need a more "intelligent"
> window to permit updating. I'd also like to be able to distribute some data
> out via a WFS/WMS to other related (but not necessarily internal clients)
> who may be using MapInfo or ArcGIS products. There is an in-house ESRI
> standard so I really need to funnel data to/from ArcSDE / shapefile for
> broader Dept consumption on ArcGIS products.
>
> Sorry to raise so many questions. However I get the feeling from what I am
> seeing that the Open and Free-er GIS products have really matured to a point
> where they are real contenders (and in some ways better) than their
> proprietary commercial cousins.
>
> The first question is - Is it possible ? The second question is - How might
> I go about it ? I'll deal with the co$ts/resources later.
> I'm happy to go off-line to discuss this and send a summary back to the list
> if appropriate.
>
> Thanks in advance,
> Shaun Kolomeitz
> Senior Technical Officer
> Systems & Support Branch
> Parks Division
> Environmental Protection Agency
>
>
>
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