** Attributes **
location: [http://www.gaia-gis.it/spatialite/%|%gaia-gis.it%|%]
author: [mailto:a.furieri@lqt.it%|%Alessandro Furieri%|%]
** Summary **
The SpatiaLite extension enables [SQLite] to support spatial data too (aka [GIS]), in a way conformant to OpenGis specifications
** Description **
* supports standard WKT and WKB formats
* implements SQL spatial functions such as AsText(), GeomFromText(), Area(), PointN() and alike
* the complete set of OpenGis functions is supported via GEOS, thus comprehending sophisticated spatial analysis functions such as Overlaps(), Touches(), Union(), Buffer() ..
* supports full Spatial metadata along the OpenGis specifications
* supports importing and exporting from / to shapefiles
* supports coordinate reprojection via [PROJ.4] and EPSG geodetic parameters dataset
* supports locale charsets via GNU libiconv
* implements a true Spatial Index based on the SQLite's RTree extension
The VirtualShape extension enables SQLite to access shapefiles as VIRTUAL TABLEs
* you can then perform standard SQL queries on external shapefiles, with no need for importing or converting them
The VirtualText extension enables SQLite to access CSV/TxtTab files as VIRTUAL TABLEs
* you can then perform standard SQL queries on external CSV/TxtTab files, with no need for importing or converting them
----
[JMN] 2009-11-07 Looks interesting - but I see no reference to Tcl on the site. I'm assuming by 'extension' this refers only to it being an extension to SQLite, and that there is no Tcl interface?
[SEH] -- Spatialite is an extension to SQLite, and thus the Tcl binding to SQLite can be used to access Spatialite's features.
[TR] --This works (using sqlite 3.3.7 or newer):
======
package require sqlite3
sqlite3 db someDBfile.db
db enable_load_extension true
db eval {select load_extension('/path/to/spatialsqlite/libraryfile')}
======
[andrewsh] On Debian, the following works fine:
======
db eval {select load_extension("libspatialite.so.2")}
======
Harm Olthof: using [tdbc] it works like this:
======
package require tdbc::sqlite3
set db_path {/path/to/sqlitefile.sqlite}
tdbc::sqlite3::connection create db $db_path
set db_handle [db getDBhandle]
$db_handle enable_load_extension 1
# The directory containing dll's for geos, proj4, etc must be added to the PATH environment
append ::env(PATH) {;} {D:\pshare\bin\spatialite\bin\spatialite-3.0.1-DLL-win-x86}
db allrows {SELECT load_extension('/path/to/spatialsqlite/libraryfile')}
======
and if it's a new or non-spatialite database file, you should initialize it:
======
db allrows {SELECT InitSpatialMetaData()}
======
[pd] -- [https://www.gaia-gis.it/fossil/libspatialite/wiki?name=mod_spatialite%|%Dynamically loading SpatiaLite%|%] <
>
No longer requires extension .dll or .so etc - same code will work on windows as *nix
======
package require sqlite3
sqlite3 db :memory:
db enable_load_extension true
db eval {SELECT load_extension('mod_spatialite')}
db eval {SELECT InitSpatialMetaData()}
db eval {CREATE table hal (id integer)}
db eval {SELECT AddGeometryColumn('hal','geometry',-1,'POINT','XY')}
db eval {SELECT CreateSpatialIndex('hal','geometry')}
set n 0
set points [list 1.0 2.0 3.0 4.0 5.0 6.0]
db transaction {
foreach {x y} $points {
db eval {
INSERT into hal ('id','geometry')
VALUES (:n, MakePoint(CastToDouble(:x), CastToDouble(:y),-1))
}
incr n
}
}
puts [db eval {SELECT id, AsText(geometry) from hal}]
======
==> 0 {POINT(1 2)} 1 {POINT(3 4)} 2 {POINT(5 6)}
======
[pd] 2017-06 -- [http://www.gaia-gis.it/gaia-sins/windows-bin-amd64/mod_spatialite-4.3.0a-win-amd64.7z%|%Windows binaries%|%] <
>
<> Database | Geography