[GRASS-user] Re: Making starspan grass-ready (need a GRASS programmer!)

[Jonathan Greenberg]

Dylan:

	Good suggestion -- the chief programmer of starspan has been
overloaded with his graduate work, so we're still looking for someone who
might be interested in helping us clean up some of the code (and adding that
feature you suggested -- I always end up just re-linking the csv back up
with the vector file if I need that function), and porting it over to GRASS.


	If anyone is not familiar with this program, we developed a way to
get raw raster values as well as some summary stats from a vector coverage
(similar to v.what.rast, but with all types of vectors including polygons
and lines), and does it extremely quickly.  It is also designed to work with
a set of rasters (e.g. you have one vector spanning 20 rasters, this will
create a single CSV from all of the rasters).

	The website is starspan.casil.ucdavis.edu if anyone is interested,
and please contact me if you might be up for working this into a new grass
module!  

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007 at hotmail.com

-----Original Message-----
From: Dylan Beaudette [mailto:dylan.beaudette at gmail.com] 
Sent: Sunday, August 13, 2006 7:35 PM
To: Matthew Perry
Cc: Jonathan Greenberg; GRASSLIST at baylor.edu
Subject: Re: [GRASSLIST:10392] Re: Making starspan grass-ready (need a GRASS
programmer!)

On Saturday 18 February 2006 00:34, Matthew Perry wrote:
> Jonathan,
>
>   StarSpan looks like an extremely valuable tool. I think it would make an
> excellent addition to the family of GRASS modules. However, I also
> appreciate the simplicity and utility of the current version since it can
> handle any GDAL/OGR supported format.. I would encourage you to continue
> the maintainence of the stand-alone version should you decide to also port
> this tool to GRASS.
>
>   I work for UC Santa Barbara with the National Center for Ecosystem
> Analysis and Synthesis and StarSpan may very well turn out to be a crucial
> tool for many of the analyses we are undertaking. I've posted a brief
> tutorial at  http://www.perrygeo.net/wordpress/?p=30  if you'd like to
take
> a look at how we plan on using StarSpan.
>
>  Thanks for an excellent software package!
>
> -- Matt
>
> On 2/15/06, Jonathan Greenberg <jgreenberg at arc.nasa.gov> wrote:
> > Hi all, we have a program we announced a year or so ago called
"starspan"
> > (starspan.casil.ucdavis.edu) -- the purpose of this program is to query
> > raster data based on vector input(s) and produce a number of outputs
> > (including a .csv file with the vector database + raster data fused
> > together).  This algorithm is FAR faster than equivalent algorithms
(e.g.
> > ESRI's zonal stats) and was designed specifically with large datasets
> > (and multiple raster and vector datasets) in mind and for import into
> > stats packages.
> >
> > We're hoping to get some feedback or even an offer of help to roll this
> > into
> > a future grass release -- if anyone is interested please contact me
(take
> > a
> > look at the website so you can see what we are trying to accomplish).
> > Ideally, we'd like someone familiar with grass's image analysis
> > algorithms (e.g. classification), since one of the major applications of
> > this program is to speed up the process of initial classification -- the
> > idea is you extract the spectral data associated with "field" data
(known
> > classes, perhaps collected with a GPS), perform the
> > classifications/accuracy assessments only on this subset (which will be
> > far smaller than the entire image), and once the correct classification
> > is decided on, only then is it applied to the entire image(s).  We did
> > this with ENVI quite a bit, and it REALLY sped up how we analyzed data.
> >
> > Much of the algorithm is finished, we mostly need help getting the
> > program grass-ready, and cleaning up some of the interface.
> >
> > Please let me know!  I use AIM and MSN (accounts below) if you would
> > prefer
> > instant messaging, otherwise please email me!
> >
> > --j
> >
> > --
> >
> > Jonathan A. Greenberg, PhD
> > NRC Research Associate
> > NASA Ames Research Center
> > MS 242-4
> > Moffett Field, CA 94035-1000
> > Office: 650-604-5896
> > Cell: 415-794-5043
> > AIM: jgrn3007
> > MSN: jgrn3007 at hotmail.com
>
> --
> Matt Perry
> perrygeo at gmail.com
> http://www.perrygeo.net

Hi everyone,

Just had a thought --- what if starspan could send the results back to the 
attribute table of the vector that it was querying, as opposed to just
saving 
the results into a CSV file? 

thoughts?

Cheers,



-- 
Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis
530.754.7341