exploring spatial database systems to handle remote sensing imagery lubia vinhas karine reis...
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![Page 1: Exploring Spatial Database Systems to Handle Remote Sensing Imagery Lubia Vinhas Karine Reis Ferreira Based on the work presented at the XVI Brazilian](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f2b5503460f94c45a07/html5/thumbnails/1.jpg)
Exploring Spatial Database Systems to Handle Remote Sensing Imagery
Lubia VinhasKarine Reis Ferreira
Based on the work presented at the XVI Brazilian Symposium on Remote Sensing in 2013
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Spatial DBMS and Raster Data?!
• Not:– Raster data tend to be more static, no need for frequent
updates– Raster data have simple values– Raster data is (very) large
• Yes:– Uniform access– Access from different applications– Reliability– Scalability
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Spatial DBMS and Raster Data?!
The “Yes” approach has never been discarded:RASDAMANTerraLibTerraServer…
Spatial extensions: having native raster datatype and functions
Oracle GeoRasterPostGIS Raster
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Oracle GeoRaster
sdo_georastersdo_raster
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PostGIS Raster (2.0)
raster : WKB representation
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A motivation application
Can we do Remote Sensing applications with raster types in Spatial DBMS?
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A motivation application
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Some conclusionsWith a minimum knowledge of their SQL API, is possible to build a remote sensing image database in PostGIS Raster as well as in Oracle GeoRaster. But there SQL is very differente.Both systems are able to do basic raster/vector processing, for example, to compute pixel value statistics on areas delimited by vector polygons. But not everything…Clipping operation in Oracle Spatial: minimum bounding box approximation and could not process data in two different spatial reference systems. Tile size is crucial for efficiency.As a final conclusion, we believe that raster support in spatial extensions has a great potential to be largely used in geographical applications. However, this support has not reached the same maturity level as has the vector support.
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Discussion
mobile
spatial data servers
producersWe need to exploremore efficiency and flexibility