kurver / spatialite

Notes collected learning about spatialite etc.

example shape files

import into db via gui

qgis to modify shapefile coord (crs) system to wgs84, that should match lat/longs from iphone etc. (i think?, e.g. unproven)

SELECT * FROM test where within(geomfromtext('POINT(174.88239 -41.06195)'), (test.geometry))

SRID

Guess SRID from .prj file - normally with shapefile

lots of NZ gis data using SRID 27200 -

• https://epsg.io/27200
• https://spatialreference.org/ref/epsg/nzgd49-new-zealand-map-grid/

Java

Links

• Docs - https://www.gaia-gis.it/gaia-sins/spatialite_topics.html
• Cookbook - https://www.gaia-gis.it/fossil/libspatialite/wiki?name=misc-docs
• Tutorial - https://www.gaia-gis.it/spatialite-1.0a/SpatiaLite-tutorial.html#t2.1
• What is spatialite - https://www.bostongis.com/PrinterFriendly.aspx?content_name=spatialite_tut01
• Point in polygon
  • http://blog.crazystyle.net/2014/06/10/spatialite-find-if-point-is-in-polygon/
  • https://gis.stackexchange.com/questions/159366/help-finding-point-in-polygon-via-spatialite-with-example-karst-zones-data
• Network routing - https://www.gaia-gis.it/spatialite-2.3.0/spatialite-network-2.3.0.html
• Java
  • jdbc - https://www.gaia-gis.it/spatialite-2.4.0-4/splite-jdbc.html

NZ linz data

• https://data.linz.govt.nz/layer/88139-porirua-0075m-urban-aerial-photos-2016/