Chaitanya,
thanks for this prompt response! We will do as you describe. Before,
we'd need your assistance: the rasdaman driver should be compiled in
only if it's found, and we are not sure whether our way of doing so is
the canonical one. Constantin will describe this soon in a separate mail.
-Peter
On 08/03/2010 07:10 AM, Chaitanya kumar CH wrote:
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
<mailto: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
<http://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
<http://www.faculty.jacobs-university.de/pbaumann>
mail: p.baum...@jacobs-university.de
<mailto: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 <http://www.rasdaman.com>, mail:
baum...@rasdaman.com <mailto: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)
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--
Best regards,
Chaitanya kumar CH.
/tʃaɪθənjə/ /kʊmɑr/
+91-9494447584
17.2416N 80.1426E
--
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)
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