[OSGeo-Discuss] C++ library for "gridding"

[Ari Jolma]

Paul Ramsey kirjoitti:
> I'll admit to interest, but can't really help. I would like to 
> eventually add raster analytics to PostGIS, and hopefully do so 
> through library linking rather than actually implementing the features 
> in the core PostGIS code.  It would be nice to have a common library 
> to work on this stuff in.

Paul and others,

I've been working on libral for a quite many years now. It's been a 
side-project and an engine for my Perl front-ends, so it has suffered 
from unstability and generally has reflected my learning of some 
programming concepts. Lately I've been thinking taking one more general 
look at it and produce a stable version. As the first step towards this 
goal, I wrote an API:

http://geoinformatics.tkk.fi/twiki/bin/view/Main/PerlGIBookDocs

that should be nice, clean, re-entrant, etc. I'm going to use libral 
with GDAL/OGR and GTK+ so there are some links to those libraries but 
they could be made optional. Now, this API is not what libral currently 
is, but it is not very far from it.

libral works on rasters which are in memory. This causes some 
limitations but on the other hand it greatly simplifies its use and 
speeds up the code.

Maybe libral could develop into a common library for gridding?

Cheers,

Ari

>
> P
>
> On 19-Oct-06, at 10:09 AM, Helena Mitasova wrote:
>
>> If anybody is interested in developing general library for gridding
>> that would include some of the standard methods and at the same time
>> allow easy implementation of new functions, I will be happy to help.
>> Our original intention with the RST modules in GRASS was to create such
>> library(including 2D, 3D and 4D) but I had to move on to erosion 
>> modeling
>> before it could be finished - so whatever we have done is now 
>> scattered in
>> the GRASS modules.
>>
>> Helena
>>
>> Markus Neteler wrote:
>>> Hi,
>>>
>>> we are working on the SWIG interface to solve that to some
>>> extend. A major rewrite is the alternative :-)
>>>
>>> Markus
>>>
>>> PS: See
>>> http://grass.gdf-hannover.de/wiki/GRASS_and_Python
>>> http://grass.gdf-hannover.de/wiki/GRASS_and_PHP
>>> http://grass.gdf-hannover.de/wiki/GRASS_and_Shell
>>>
>>> On 10/18/06, Paul Ramsey <pramsey at refractions.net> wrote:
>>>> Yes, unfortunately the algorithmic goodness of GRASS is scattered
>>>> throughout the program executables rather than consolidated in a
>>>> library.
>>>>
>>>> On 18-Oct-06, at 2:37 AM, Rob Agar wrote:
>>>>
>>>> > Jachym Cepicky wrote:
>>>> >> as Frank pointed out, GRASS is the tool you are searching for. 
>>>> GRASS
>>>> >> has no direct support for Kriging, but it is possible to provide 
>>>> this
>>>> >> via R package or gstat.
>>>> >> GRASS's modul v.surf.rst is the module, which works for most 
>>>> data the
>>>> >> best. See [1] for details.
>>>> >
>>>> > That great, but ideally I'm after a directly programmable interface
>>>> > (as opposed to a command line program).  GRASS is an application
>>>> > rather than a library isn't it?
>>>> >
>>>> > Rob
>>>> >
>>>> > 
>>>> ---------------------------------------------------------------------
>>>> > To unsubscribe, e-mail: discuss-unsubscribe at mail.osgeo.org
>>>> > For additional commands, e-mail: discuss-help at mail.osgeo.org
>>>> >
>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe, e-mail: discuss-unsubscribe at mail.osgeo.org
>>>> For additional commands, e-mail: discuss-help at mail.osgeo.org
>>>>
>>>>
>>>
>>>
>>
>>
>> --Helena Mitasova
>> Department of Marine, Earth and Atmospheric Sciences
>> North Carolina State University
>> 1125 Jordan Hall
>> NCSU Box 8208
>> Raleigh, NC 27695-8208
>> http://skagit.meas.ncsu.edu/~helena/
>>
>> email: hmitaso at unity.ncsu.edu
>> ph: 919-513-1327 (no voicemail)
>> fax 919 515-7802
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: discuss-unsubscribe at mail.osgeo.org
>> For additional commands, e-mail: discuss-help at mail.osgeo.org
>>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: discuss-unsubscribe at mail.osgeo.org
> For additional commands, e-mail: discuss-help at mail.osgeo.org
>


-- 
Prof. Ari Jolma
Geoinformaatio- ja paikannustekniikka
Geoinformation and positioning technology
Teknillinen Korkeakoulu / Helsinki University of Technology
POBox 1200, 02015 TKK, Finland
Email: ari.jolma at tkk.fi URL: http://www.tkk.fi/~jolma