[OSGeo-Discuss] Benefits raster data on RDBMS
gilberto.camara at inpe.br
Mon Nov 3 04:13:49 PST 2008
Concerning the benefits of having raster data
stored together with vector data in a spatial
database, let me first quote from an excellent
paper from the late Jim Gray
("Scientific Data Management in the Coming Decade"):
"What’s wrong with files?
Everything builds from files as a base. HDF uses files.
Database systems use files. But, file systems have no
metadata beyond a hierarchical directory structure and file
names. They encourage a do-it-yourself- data-model that
will not benefit from the growing suite of data analysis
tools. They encourage do-it-yourself-access-methods that
will not do parallel, associative, temporal, or spatial
search. They also lack a high-level query language.
Lastly, most file systems can manage millions of files, but
by the time a file system can deal with billions of files, it
has become a database system."
In other words, if you have substantial amounts of raster
data (as is increasingly the case in geospatial application),
you will need to develop a significant amount of software
to manage your files. Unless... your data is handled by a
raster-enabled spatial database.
National Institute for Space Research (INPE)
Sao Jose dos Campos, Brazil
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