[Qgis-developer] Application of QGIS to
Richard Duivenvoorde
rdmailings at duif.net
Thu Apr 16 13:23:50 EDT 2009
Tom Maddock wrote:
> Hello,
>
> We are newcomers to QGIS and are trying to evaluate its suitability for
> application to some ecological programs we have developed. I am not
> sure we are in the proper forum for our questions, which are many, but
> here is a start.
>
> We have developed an ArcGIS 9.2 custom application in VB 2005, .NET
> framework 2.0 to derive parameters for the riparian evapotranspiration
> package in MODFLOW and visualize MODFLOW groundwater results. We are
> considering using QGIS to perform the geo-processing component of our
> program instead of using the ESRI product. It should be noted that
> MODFLOW is a FORTRAN-90 product (yes, some people still use FORTRAN),
> and is used to solve the groundwater flow equations.
>
> We would like to know if QGIS provides some of the out of the box
> geo-processing components such as overlay analysis and zonal statistics
> similar to ArcGIS.
>
> Here is the list of geo-processing tasks that we perform in our program:
>
> * Attributing vegetation polygon shapefile interactively by
> selecting polygons and enter % cover values on a form
> ./acda/Acda en de Munnik - Trilogie Deel I Zwerf'on/Mp3/Acda en de Munnik - 10 - Dag Esmee.mp3
>
>
> * Creating finite difference grid as a polygon shapefile in order to
> support irregular grid sizes
>
> * Intersecting vegetation polygon shapefile with the finite
> difference grid shapefile and updating areas of the polygons
>
> * Obtaining average surface elevation per riparian polygon derived
> from (DEM) and write it to vegetation polygon shapefile
>
> * Access each record in the attribute table and write values in a
> text file with specific format.
>
> Couple of questions:
>
> * Is there a support for relational database management such as join
> and relates?
>
> * What are the supporting programming languages and can we re-use
> some of the components that are already written in VB .NET in the
> project?
>
> Thomas Maddock III
> Professor and Head
> Department of Hydrology & Water Resources
> University of Arizona
> 1133 E. James E. Rogers Way, Rm. 122
> Tucson, Arizona 85721
> (520)621-7120
Hi Tom,
I think you should try to ask this in the qgis-users list. I will
forward this message to it ..
Short answers of some things I know:
- postgresql/postgis is a relational database which can be used with
qgis which I think can do what you want.
- though qgis is written in c++/qt, there is a very nice python-plugin
interface which can be used to write extensions
- most dataformats are both readable and writable
- qgis can be used as frontend of GRASS a (from what I've heard) a
pretty powerfull opensource gis
Hope this helps a little, and maybe other people on the users list can
help you any further.
Regards,
Richard Duivenvoorde
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