Peter, Please create a new ticket at http://trac.osgeo.org/gdal/newticket and attach your code. If all goes smoothly, it will be added into the 1.8 branch of GDAL and released with GDAL-1.8.0
On Tue, Aug 3, 2010 at 12:20 AM, Peter Baumann < p.baum...@jacobs-university.de> wrote: > Dear GDAL maintainers, > > we have written a GDAL driver to add the rasdaman database as another "data > format" that GDAL can read, and we would like to contribute this to the GDAL > project. > > Rasdaman is a raster database middleware offering an SQL-style query > language on multi-dimensional arrays of unlimited size, stored in a > relational database. See www.rasdaman.org for the open-source code, > documentation, etc. Currently rasdaman is under consideration for OSGeo > incubation. > > In our driver implementation, GDAL connects to rasdaman by defining a query > template which is instantiated with the concrete subsetting box upon every > access. This allows to deliver 2-D cutouts from n-D data sets (such as > hyperspectral satellite time series, multi-variable climate simulation data, > ocean model data, etc.). In particular, virtual imagery can be offered which > is derived on demand from ground truth data. Some more technical details are > given below [1]. > > The code compiles smoothly with the latest GDAL code and is undergoing > final tests and documentation. For a clean integration with the GDAL code > base we are asking for further advice. In particular, our Makefile structure > needs some fine tuning, we need to know intended use of some parameters. > > We hope that this contribution is of value to the community, any comments > are highly appreciated. > > Thanks in advance for your assistance, > Peter & Constantin > > > [1] The connect string syntax follows the WKT Raster pattern and goes like > this: > rasdaman: > query='select a[$x_lo:$x_hi,$y_lo:$y_hi] from MyImages as a' > tileXSize=512 tileYSize=512 > [host='localhost'] [port=7001] [database='RASBASE'] > [user='rasguest'] [password='rasguest'] > > The rasdaman query language (rasql) string in this case only performs > subsetting. Upon image access by GDAL, the $ parameters are substituted by > the concrete bounding box computed from the input tile coordinates. > > However, the query provided can include any kind of processing, as long as > it returns something 2-D. For example, this determines the average of red > and near-infrared pixels from the oldest image time series: > query='select ( a.red+a.nir ) /2 [$x_lo:$x_hi,$y_lo:$y_hi, 0 ] from > SatStack as a' > > The further key-value pair parameters in brackets are optional, their > defaults are listed. BTW, the default user has read-only access to the > database as per rasdaman convention. > > As rasdaman supports concurrent access with parallel query evaluation, any > number of such connections can be opened. > > -- > Dr. Peter Baumann > - Professor of Computer Science, Jacobs University Bremen > www.faculty.jacobs-university.de/pbaumann > mail: p.baum...@jacobs-university.de > tel: +49-421-200-3178, fax: +49-421-200-493178 > - Executive Director, rasdaman GmbH Bremen (HRB 147737) > www.rasdaman.com, mail: baum...@rasdaman.com > tel: 0800-rasdaman, fax: 0800-rasdafax, mobile: +49-173-5837882 > "Si forte in alienas manus oberraverit hec peregrina epistola incertis > ventis dimissa, sed Deo commendata, precamur ut ei reddatur cui soli > destinata, nec preripiat quisquam non sibi parata." (mail disclaimer, AD > 10xx) > > > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Best regards, Chaitanya kumar CH. /tʃaɪθənjə/ /kʊmɑr/ +91-9494447584 17.2416N 80.1426E
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