Building a Spatial Database in PostgreSQL
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The document discusses building a spatial database in PostgreSQL using PostGIS. It provides an introduction to spatial data and databases, and explains why PostGIS was created - to provide an open source spatial extension for PostgreSQL that is compliant with OpenGIS standards. It covers key topics like spatial data types, spatial relationships, spatial indexing and functions, and implementing the OpenGIS specification in PostgreSQL.
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Building a Spatial Database in PostgreSQL
- 1. Building a Spatial Database in PostgreSQL David Blasby Refractions Research [email_address] http://postgis.refractions.net
- 8. Roads are represented as Lines Mail Boxes are represented as Points
- 25. Original Polygons Union Intersection
- 26. Original river network Buffered rivers
- 41. R-Tree Indexing Overlap
- 42. R-Tree Indexing Distance
- 43. Guttman A.: 'R-trees: A Dynamic Index Structure for Spatial Searching', Proc ACM SIGMOD Int. Conf. on Management of Data, 1984
- 44. SQL example Create “pubs” table create table pubs (name varchar, beer_price float4); addgeometrycolumn(‘beer_db’,'pubs','location’ ,2167,'POINT',3);
- 45. Insert data insert into pubs values ( 'Garricks Head', 4.50, GeometryFromText( 'POINT (1196131 383324)’ ,2167) );
- 46. Perform Query select name, beer_price, distance(location, GeometryFromText('POINT(1195722 383854)',2167)) from pubs order by beer_price; name | beer_price | distance ---------------+------------+------------------ Fireside | 4.25 | 1484.10275160491 The Forge | 4.33 | 1533.06561109862 Rumours | 4.46 | 2042.00094093097 Garricks Head | 4.5 | 669.389105609889 Slap Happy | 4.5 | 1882.31910168298 Old Bailys | 4.55 | 1147.20900404641 Black Sheep | 4.66 | 536.859935972633 Big Bad Daves | 4.75 | 907.446543878884
- 47. Perform Query select name, beer_price + 0.001 * distance(location, GeometryFromText('POINT(1195722 383854)',2167)) as net_price from pubs order by price; name | net_price ---------------+------------------ Garricks Head | 5.16938910560989 Black Sheep | 5.19685978338474 Big Bad Daves | 5.65744654387888 Old Bailys | 5.69720919478127 Fireside | 5.73410275160491 The Forge | 5.86306553480468 Slap Happy | 6.38231910168298 Rumours | 6.50200097907794
- 52. Questions David Blasby Refractions Research [email_address] http://postgis.refractions.net