Projects tagged ‘spatial’ and ‘topology’

The JTS Topology Suite is an API of 2D spatial predicates and functions. It has the following design goals: * JTS conforms to the Simple Features Specification for SQL published by the Open GIS ... [More] Consortium * JTS provides a complete, consistent, robust implementation of fundamental 2D spatial algorithms * JTS is fast enough for production use * JTS is written in 100% pure Java( * JTS is open source (under the LGPL license) [Less]

A port of JTS to .Net, rewritten to take advantage of CLR constructs, as well as remove some of the legacy issues in JTS.

NetTopologySuite is a C#/.NET port of JTS Topology Suite, a Java library for GIS operations, (OpenGIS compliant). The main goal of this project is to have a .NET GIS solution that is fast and ... [More] reliable for any kind of .NET platform, PocketPC and SQL Server 2005 (through CLR integration) included. [Less]

The GIS in the Cloud (App Engine + JTS) reference project is now available at http://giscloud.appspot.com UpdatesNEW! Beta 0.9 The spatial index is stored in Memcache and re-used from there rather ... [More] than going to disk each time and deserializing it. Beta 0.8 Spatial indexes are working in GIS in the Cloud beta 0.8. See SerializedSpatialIndexes. Beta 0.8 uses deserializes a modified JTS STRtree from disk for faster spatial queries. MotivationWhile many GIS/spatial App Engine discussions center on the python SDK (with pre-computing grids or geocells and heavy lifting done with set membership in the datastore), this reference project uses the Java Topology Suite (http://www.vividsolutions.com/jts/jtshome.htm) within the App Engine server to demonstrate point-in-polygon and polygon-in-polygon spatial queries. The GIS in the Cloud app is pure Java and was built with Google App Engine SDK for Java Google Plugin for Eclipse Google Web Toolkit Google Web Toolkit API Libraries - Google Maps 1.0 Library Java Topology Suite The Java Topology Suite was ported to C++ and became GEOS, which was embedded in PostgreSQL to become PostGIS, allowing users access to spatial functions within SQL. While App Engine does not give us spatial functions in GQL, the GIS in the Cloud app will demonstrate a GQL/JTS combination to accomplish the same effect. The current version of the application demonstrates use of the datastore and employs JTS to query point-in-polygon and polygon-in-polygon. Single clicks on the map trigger the point-in-polygon test (the point is the map center and the polygon is Salt Lake County). With zoom or drag, the polygon-in-polygon test is triggered. The first polygon is the map bounds and the second is Salt Lake County. [Less]