Designing a New Raster Sub-System for GRASS-7

Martin Hruby

Abstract


The paper deals with a design of a new raster sub-system intended for modern GIS systems open for client and server operation, database connection and strong application interface (API). Motivation for such a design comes from the current state of API working in GRASS 6. If found attractive, the here presented design and its implementation (referred as RG7) may be integrated to the future new generation of the GRASS Geographical Information System version 7-8. The paper describes in details the concept of raster tiling, computer storage of rasters and basic raster access procedures. Finally, the paper gives a simple benchmarking experiment of random read access to raster files imported from the Spearfish dataset. The experiment compares the early implementation of RG7 with the current implementation of rasters in GRASS 6. As the result, the experiment shows the RG7 to be significantly faster than GRASS in random read access to large raster files.

Keywords


GRASS, GIS, raster sub-system, geographical data, 3D rasters

References


GRASS Homepage: http://grass.fbk.eu/

GRASS-6 Raster API Manual: http://grass.osgeo.org/programming6/gisrasterlib.html

PostgreSQL Homepage: http://www.postgresql.org/

SQLite3 Homepage: http://www.sqlite.org/

GDAL Homepage: http://www.gdal.org/

PostGIS Homepage: http://postgis.refractions.net/

Raster3D Manual Page: http://grass.osgeo.org/manuals/html70_user/raster3D. html

Spearfish Data set: http://grass.fbk.eu/download/data6.php


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