rasdaman is a raster server allowing queries on n-D raster data stored in a standard relational database.
This Quick Start describes how to try out queries on a sandbox of raster objects. Before trying these examples, the rasdaman server has to be started (Geospatial ‣ Databases ‣ Rasdaman ‣ Start Rasdaman Server).
- Go to the EarthLook Earthlook demo to explore various demo data sets. The small ones are part of OSGeo-Live, those utilizing larger sets forward directly to the Earthlook site .
Open a console and open the sample database installed locally
use the rasql utility to send queries and receive results, for example:
$ rasql -q "select png((char)(c.red / (c.red + c.green) - c.green / (c.red + c.green)) > 0.6 * 255) from rgb AS c" --out fileuse your favorite image inspection tool to open the file generated.
Open a console
run the demo ingestion script:
$ install_demo.shuse the rasql utility to send queries and receive results, for example:
$ rasql -q "select png( NIR ) from NIR" --out file
Here are some additional challenges for you to try:
- Explore the demo data sets by browsing the rasql query language guide
- To learn more about the OGC Web Coverage Processing Service (WCPS) Language standard (which was heavily inspired by rasdaman), a starting point is the documentation and tutorials page .