id,page,ref,title,content,breadcrumbs,references
spatialite:spatial-indexing-latitude-longitude-columns,spatialite,spatial-indexing-latitude-longitude-columns,Spatial indexing latitude/longitude columns,"Here's a recipe for taking a table with existing latitude and longitude columns, adding a SpatiaLite POINT geometry column to that table, populating the new column and then populating a spatial index: 
             import sqlite3

conn = sqlite3.connect(""museums.db"")
# Lead the spatialite extension:
conn.enable_load_extension(True)
conn.load_extension(""/usr/local/lib/mod_spatialite.dylib"")
# Initialize spatial metadata for this database:
conn.execute(""select InitSpatialMetadata(1)"")
# Add a geometry column called point_geom to our museums table:
conn.execute(
    ""SELECT AddGeometryColumn('museums', 'point_geom', 4326, 'POINT', 2);""
)
# Now update that geometry column with the lat/lon points
conn.execute(
    """"""
    UPDATE museums SET
    point_geom = GeomFromText('POINT('||""longitude""||' '||""latitude""||')',4326);
""""""
)
# Now add a spatial index to that column
conn.execute(
    'select CreateSpatialIndex(""museums"", ""point_geom"");'
)
# If you don't commit your changes will not be persisted:
conn.commit()
conn.close()","[""SpatiaLite""]",[]