[GRASS-user] RE: [OTT_OSGEO] chamelon-GRASS application site with URL

Sampson, David dsampson at NRCan.gc.ca
Fri Sep 1 11:19:44 EDT 2006


Can't wait for a howto for all us GRASS users that lack the MAPSERVER
know how.

Again, Good work


-----Original Message-----
From: Massimiliano Cannata [mailto:massimiliano.cannata at supsi.ch] 
Sent: September 1, 2006 11:04
To: users at ottawa.osgeo.org
Cc: GRASS user list; Chameleon Users
Subject: Re: [OTT_OSGEO] chamelon-GRASS application site with URL

Hi Dave,
speed is just a matter of hardware in this case :-( Yes, basin are
dynamically generated, when you click the map or a station it get the
coordinate, then they are passed to GRASS.
With a new GRASS command that I wrote, the nearest pixel coordinate
belonging to a river is selected, and the r.water.outlet is run. The
raster basin generated is then converted in vector and represented.

For statistics, a MASK fitting the basin is generated and then r.stats,
r.univar are run.

Also PanaChart php library was used to generate the graph.

That's all.
Again sorry for the slowness ! It will be better in future...


Sampson, David wrote:
> Cool, Cool, Cool....
> I like it....
> I had an issue with popups, but that's normal when you block them....
> Worked well in firefox
> IS the watershed a pre defined boundarie, or is GRASS running the 
> r.watersheds and creating it from scratch?  Does this get cached?  Or 
> is it a predefined watershed boundary?...
> The ROI requirement was not clear at first, but trial and error worked

> that out....
> I perosnaly like zoom tools that can draw an extent box instead of a 
> point and given zoom factor, but that's my preference
> Load time and processing time is a little slow, but that's secondary.
> I'm assuming that's across the board.
> For others that are going to try it out this is the process I tried 1.

> load page 2. zoom into an area (mag +) so you can see some individual 
> pints 3. Chooce the ROI tool (far left icon) 4. draw ROI (if there is 
> processing of the watersheds then I assume the larger the ROI more 
> processing time) 5. Select watershed from point (Third from left) 6. 
> Select a red point inside the ROI (notice the ROI only comes up when 
> you switch tools and select point) 7. Tri the INFO button to learn 
> more about each site (7th from left)
> So... Cool, I like
> What other widgets are connected to GRASS?...
> I look forward to the technical docs and seeing more people use it.
> -----Original Message-----
> From: Massimiliano Cannata [mailto:massimiliano.cannata at supsi.ch]
> Sent: September 1, 2006 09:41
> To: GRASS user list; Chameleon Users; Ottawa OSgeo
> Subject: [OTT_OSGEO] chamelon-GRASS application site with URL
> Hi all,
> I would like to inform you that a demo site is now on-line to see how 
> GRASS is run trough Chameleon.
> For instruction on how to use it, you can click the Help button.
> The URL is:
> Could you try to check if everything is working and eventually give me

> a feedback?
> (It could result not too fast in map loading due to the low hardware 
> configuration of the server)
> As soon as possible I will add a page with more technical details on 
> how to set up such a link.
> Thanks,
> and hope to see you in Lausanne.
> Massimiliano


Dr. Eng. Massimiliano Cannata
Responsabile Area Geomatica
Istituto Scienze della Terra
Scuola Universitaria Professionale della Svizzera Italiana Via Trevano,
c.p. 72
CH-6952 Canobbio-Lugano
Tel: +41 (0)58 666 62 14
Fax +41 (0)58 666 62 09 

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