High level (and incomplete) overview of PostGIS.

1. Introduction to PostGIS Spatial Extensions for PostgreSQL Mark Leslie Geospatial Architect LISAsoft

3. Why is PostGIS?

4. What can PostGIS do?

5. Who is using PostGIS?

6. Why use PostGIS?

8. Geometry represented by linear shapes

9. Spatial Functions (Constructors, Accessors, Editors, Processors, Relational Operators, Processing Functions)

10. Advanced geometric indexing

12. Data management of files problematic

13. Existing GIS data services (as of 2001) were terribly expensive

14. No existing integrated spatial databases

15. Refractions had some time to kill

17. GEOS - Geometry Engine - Open Source

18. Provides spatial predicate functions, spatial operators and topological functions.

19. PostgreSQL - helpful little application

21. Installation - Debian sudo apt-get install postgresql-8.3-postgis or from source svn co http://svn.refractions.net/postgis/trunk/ postgis/ cd postgis ./autogen.sh ./configure make sudo make install

24. or need a more recent version?

25. Use the Stack Builder application for version PostgreSQL 8.3

26. Download the installer for PostgreSQL 8.3 from

27. http://postgis.refractions.net/download/windows/

29. or need a more recent version?

30. Use the Stack Builder application for version PostgreSQL 8.3

31. Download the installer for PostgreSQL 8.3 from

32. http://postgis.refractions.net/download/windows/

33. or from source?

34. Good luck.

36. -s 4326 – Use WGA83 coordinate reference system

37. -D – Use PostgreSQL dump format (faster than inserts)

38. -I – Create spatial (GIST) index after loading

39. -S – Generate simple geometries (eg. Line instead of Multiline)

41. On Windows use:

42. shp2pgsql -s 4326 -D -I -S roads.shp roads > roads.sql

43. psql -f roads.sql demo

44. or setup a .pgpass file

47. S57 DGN Memory BNA CSV MySQL

48. GML GPX KML GeoJSON Interlis 1

49. Interlis 2 GMT SQLite ODBC PostgreSQL

52. Then get some coffee, in Perth.

53. Node stats: total(231808103), max(256523410) Way stats: total(18781596), max(23689770) Relation stats: total(6967), max(9763) real 806m40.109s user 394m41.460s sys 5m8.507s

54. Loading Data – Spatial Data Integrator

56. Allows standard discovery of geographic objects and their parameters: point dimension, type, projection.

57. spatial_reference_sys

58. Provides definitions of available projections.

60. VALUES ("Greenwich Ferry Wharf",

61. ST_SetSRID(ST_GeometryAsText(

62. "POINT(151.18323 -33.84162)"), 4283);

64. ..."LINESTRING(151.18456 -33.84225,151.18424 -33.84196,151.18342 -33.84122)"...

66. ..."LINESTRING(151.18456 -33.84225,151.18424 -33.84196,151.18342 -33.84122)"...

67. ..."POLYGON((151.2111 -33.8754,151.2109 -33.8753,151.211 -33.8749,151.2111 -33.8749,151.2111 -33.8753)(151.211 -33.8750,151.2111 -33.8751,151.211 -33.8751,151.211 -33.875,151.211 -33.8750))"...

69. ..."LINESTRING(151.18456 -33.84225,151.18424 -33.84196,151.18342 -33.84122)"...

70. ..."POLYGON((151.2111 -33.8754,151.2109 -33.8753,151.211 -33.8749,151.2111 -33.8749,151.2111 -33.8753)(151.211 -33.8750,151.2111 -33.8751,151.211 -33.8751,151.211 -33.875,151.211 -33.8750))"...

71. Plus MULTIPOINT, MULTILINESTRING, MULTIPOLYGON, COLLECTION

73. ..."LINESTRING(151.18456 -33.84225,151.18424 -33.84196,151.18342 -33.84122)"...

74. ..."POLYGON((151.2111 -33.8754,151.2109 -33.8753,151.211 -33.8749,151.2111 -33.8749,151.2111 -33.8753)(151.211 -33.8750,151.2111 -33.8751,151.211 -33.8751,151.211 -33.875,151.211 -33.8750))"...

75. Plus MULTIPOINT, MULTILINESTRING, MULTIPOLYGON, COLLECTION

76. And even CIRCULARSTRING, COMPOUNDCURVE, CURVEPOLYGON, MULTICURVE and MULTISURFACE

79. select ST_asText(the_geom) from road where gid = 1; LINESTRING(111.846282958984 0,111.844451904297 -0.00191354146227241)

81. select ST_asText(the_geom) from road where gid = 1; LINESTRING(111.846282958984 0,111.844451904297 -0.00191354146227241)

82. select ST_asGML(the_geom) from road where gid = 1; <gml:LineString srsName=&quot;EPSG:4326&quot;><gml:coordinates>111.846282958984,0 111.844451904297,-0.00191354146227241</gml:coordinates></gml:LineString>

84. select ST_asText(the_geom) from road where gid = 1; LINESTRING(111.846282958984 0,111.844451904297 -0.00191354146227241)

85. select ST_asGML(the_geom) from road where gid = 1; <gml:LineString srsName=&quot;EPSG:4326&quot;><gml:coordinates>111.846282958984,0 111.844451904297,-0.00191354146227241</gml:coordinates></gml:LineString>

86. select ST_asSVG(the_geom) from road where gid = 1; M 111.84628295898437 0 111.84445190429687 0.001913541462272

88. select ST_asText(the_geom) from road where gid = 1; LINESTRING(111.846282958984 0,111.844451904297 -0.00191354146227241)

89. select ST_asGML(the_geom) from road where gid = 1; <gml:LineString srsName=&quot;EPSG:4326&quot;><gml:coordinates>111.846282958984,0 111.844451904297,-0.00191354146227241</gml:coordinates></gml:LineString>

90. select ST_asSVG(the_geom) from road where gid = 1; M 111.84628295898437 0 111.84445190429687 0.001913541462272

91. select ST_asGeoJSON(the_geom) from road where gid = 1; {&quot;type&quot;:&quot;LineString&quot;,&quot;coordinates&quot;:[[111.846282958984375,0.000000000000000],[111.844451904296875,-0.001913541462272]]}

93. ST_MakePoint(x, y, [z], [m]), ST_MakePointM(x, y, m)

94. ST_MakeLine(point, point), ST_MakeLine(point set)

95. ST_LineFromMultiPoint(multipoint)

96. ST_MakePolygon(linestring, linestring[])

97. ST_Collect(geometry, geometry), ST_Collect(geometry set)

98. ST_Dump(geometry)

100. ST_Scale(geometry, xScale, yScale, zScale)

101. ST_RotateX(geometry, radians)

102. ST_RotateY(geometry, radians)

103. ST_RotateZ(geometry, radians)

105. ST_Reverse(geometry)

106. ST_ForceRHR(geometry)

107. ST_SnapToGrid(geometry, originX, originY, sizeX, sizeY)

108. ST_SnapToGrid(geometry, sizeX, sizeY)

109. ST_SnapToGrid(geometry, size)

110. ST_SnapToGrid(geometry, geometry, sizeX, sizeY, sizeZ, sizeM)

112. ST_ExteriorRing(polygon), ST_InteriorRingN(polygon)

113. ST_PointN(linestring), ST_StartPoint(linestring), ST_EndPoint(linestring)

114. ST_X(point), ST_Y(point), ST_Z(point), ST_M(point)

115. ST_AddPoint(linestring), ST_RemovePoint(linestring), ST_SetPoint(linestring)

117. <, <=, ==, >=, >, !=

119. <, <=, ==, >=, >, !=

120. Geometric relational operators work on 2d-4d values with or without width, height or depth

122. ST_Within(A, B) = ST_Contains(B, A)

131. ST_Covers(A, B) = ST_CoveredBy(B, A)

133. ST_Distance – Minimum distance beteen geometries

134. ST_Distance_Spheroid – Minimum distance between geometries over a specific spheroid

135. ST_DistanceSphere – Minimum distance between geometries over a perfect sphere

137. wkb_geometry – Geometry column (Point)

138. name – City name

139. boundaries:

140. the_geom – Geometry column (Polygon)

141. state – State containing boundary

142. earthquake_risk:

143. the_geom – Geometry column (Polygon)

144. riskval – Indicator of earthquake risk

146. FROM cities c, earthquake_risk er, boundaries b

147. WHERE er.riskval = '> 0.10'

148. AND ST_Within(c.wkb_geometry, er.the_geom)

149. AND c.name IS NOT NULL

150. AND ST_Within(c.wkb_geometry, b.the_geom)

151. AND b.state = 'NEW SOUTH WALES';

153. ---------------

154. Stratford

155. Craven

156. Bunyah

157. Chichester

158. Salisbury

159. Coolongolook

160. Wootton

161. ...

162. (36 rows)

164. nveg_1788, pveg_1988

165. the_geom – Geometry (Polygon)

166. tn_d – Percentage of ground shaded by vegetation

168. CASE WHEN n.ts_d > p.ts_d THEN 'Loss'

169. WHEN n.ts_d < p.ts_d THEN 'Gain'

170. ELSE 'No Change' END as change,

171. ST_Intersection(n.the_geom, p.the_geom) as the_geom

172. FROM nveg_1788 as n, pveg_1988 as p

173. WHERE ST_Intersects(n.the_geom, p.the_geom);

174. Verify Assumptions

176. (SELECT ST_Union(the_geom) AS the_geom FROM nveg_1788) a,

177. (SELECT ST_Union(the_Geom) AS the_geom FROM pveg_1988) b;

178. st_area

179. 4.58800965870143e-05

181. FROM change GROUP BY change;

182. count | change

183. -------+-----------

184. 4785 | No Change

185. 2013 | Gain

186. 2465 | Loss

188. sum(ST_Area(ST_Intersection)) AS area

189. FROM change GROUP BY change;

190. count | change | sum

191. -------+-----------+------------------

192. 4785 | No Change | 521.507080938973

193. 2013 | Gain | 54.5533372716394

194. 2465 | Loss | 119.174361913388

195. Environmental Change

198. Relational Constraints <http://www.nabble.com/Any-Projected-Straights-Function--td19439097.html#a19448155>

199. Tiger Geocoder <http://postgis.refractions.net/support/wiki/index.php?Tiger%20Geocoder>

200. Topology <http://postgis.refractions.net/support/wiki/index.php?PostgisTopology>

202. Infoterra, a leading European satellite and aerial imagery provider, runs their data provision and sales systems on PostGIS, and stores the complete Ordnance Survey database on PostGIS.

204. EU Joint Research Centre

205. With billion dollar satellites and PostGIS, the EU Joint Research Centre monitors fishing vessels in the North Atlantic and provides real-time reporting and mapping to decision makers and regulators.

207. EU Joint Research Centre

208. MADEIRA GPS

209. MADEIRA GPS, a company that started in 2005, with a simple project in mind: Deliver PDA-based navigation, with auto-routing, for Madeira Island's tourism.

211. Advanced indexing

212. Transformation support

213. Variety of output format options ((E)WKB, (E)WKT, GeoJSON, GML, KML, SVG)

215. Measurement and Linear Referencing

218. Fewer hosting providers than Oracle/MSSQLServer/mySQL

219. Incomplete curve support

220. Non-production topology support

222. http://postgis.refractions.net/support/wiki/

223. User List

224. http://postgis.refractions.net/mailman/listinfo/postgis-users

225. IRC

226. irc://chat.freenode.net/postgis

227. Me

228. [email_address]

230. Workshops and tutorials

231. Climate Change Integration Plugfest

232. Installfest

233. Bird of a Feather sessions

234. Code Sprint

235. Good times