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| {{Upravit}} | | {{freegiswiki|RasterLite}} |
| [[Image:spatialite-logo.png|175px|right]]
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| '''RasterLite''' je rozšíření [[SpatiaLite]] pro uložení, manipulaci a analýzu rastrových dat.
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| __TOC__
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| Pod operačním systémem Debian GNU/Linux nainstalujeme SpatiaLite příkazem
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| sudo apt-get install librasterlite2 rasterlite-bin
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| == Import dat ==
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| Nejprve stáhneme testovací data a vytvoříme SpatiaLite databázi.
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| wget http://geo.fsv.cvut.cz/~landa/vyuka/postgis/dem.tif
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| spatialite raster.sqlite < init_spatialite-2.3.sql
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| Data naimportujeme pomocí nástroje <tt>rasterlite_load</tt>.
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| rasterlite_load -d raster.sqlite -T dem -f dem.tif -i TIFF -e 2065
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| Příklad jednoduchého dotazu.
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| <source lang="sql">
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| SELECT tile_id, AsText(geometry) FROM dem
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| WHERE NOT IsEmpty(geometry) LIMIT 3;
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| </source>
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| <pre>
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| tile_id = 0
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| astext(geometry) = POLYGON((-180 90, -177.904167 90, -177.904167 87.904167, -180 87.904167, -180 90))
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| tile_id = 1
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| astext(geometry) = POLYGON((-177.904167 90, -175.808333 90, -175.808333 87.904167, -177.904167 87.904167, -177.904167 90))
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| tile_id = 2
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| astext(geometry) = POLYGON((-175.808333 90, -173.7125 90, -173.7125 87.904167, -175.808333 87.904167, -175.808333 90))
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| </pre>
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| V databázi se vytvoří dvě tabulky
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| * <tt>dem_rasters</tt> - binární data dlaždic
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| * <tt>dem_metadata</tt> - metadata dlaždic
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| <source lang=sql>
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| SELECT * FROM dem_rasters LIMIT 3;
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| </source>
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| <pre>
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| id|raster
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| 1 |II*
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| 2 |II*
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| 3 |II*
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| </pre>
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| <source lang=sql>
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| SELECT * FROM marble_metadata LIMIT 3;
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| </source>
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| <pre>
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| id source_name tile_id width height pixel_x_size pixel_y_size geometry
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| ---------- --------------- ---------- ---------- ---------- ------------ ------------ ----------
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| 0 raster metadata 0 0 0 0.0 0.0
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| 1 /opt/vyuka/land 0 503 503 0.0041666666 0.0041666666
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| 2 /opt/vyuka/land 1 503 503 0.0041666666 0.0041666666
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| </pre>
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| == Související články ==
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| * [[SpatiaLite]]
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| * [[PostGIS Raster]]
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| == Externí odkazy ==
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| * [http://www.gaia-gis.it/spatialite/rasterlite-man.pdf RasterLite Manual]
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| * [http://www.gaia-gis.it/spatialite/rasterlite-how-to.pdf RasterLite HowTo]
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| {{Databáze}}
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| {{GIS}}
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| {{GFOSS}}
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