Monthly Archives: April 2009

Generic Geometry Library

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Two months ago Barend Gehrels announced on the OSGeo Discuss list ongoing Open Source project called Generic Geometry Library, GGL in short.

The Generic Geometry Library provides a generic implementation of geometry algorithms, working with geometry types provided by the library itself as well as user-defined types. The library is implemented in C++ programming language with extensive use of elements of metaprogramming like class (type) templates, static polymorphism and compile-time execution. Consequently, GGL is built upon two of the greatest pieces of C++ code ever written by humanity: C++ Standard Library and Boost C++ Libraries.

In my opinion, this project is valuable and have potential which may interest many of us, FOSS4G users and developers. The OSGeo Foundation agreed to host this mailing list ggl@lists.osgeo.org dedicated to discussions development and use of the Generic Geometry Library.

Make’ing PostGIS database

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I’ve extended Sean’s idea of baking PostGIS-enabled databases using GNU Make a little bit and prepared new version of Makefile.postgis.

How to use it:

  • Install it to save yourself some typing: 
    $ ln -s Makefile.postgis Makefile
  • Run make to get basic usage information: 
    $ make
****** Makefile.postgis usage ******
*** Create new PostGIS database:
	DBNAME=mydb make -f Makefile.postgis create
*** Drop PostGIS database:
	DBNAME=mydb make -f Makefile.postgis drop
*** Check if database exists and PostGIS if enabled with PostGIS:
	DBNAME=mydb make -f Makefile.postgis check
*** Check if database exists:
	DBNAME=mydb make -f Makefile.postgis check-db
*** Check if database is enabled with PostGIS:
	DBNAME=mydb make -f Makefile.postgis check-postgis
  • Check if your database exists: 
    $ DBNAME=mydb make check-db
****** Makefile.postgis ******
****** Database 'mydb' not found
  • Create your database with PostGIS extension installed: 
    $ DBNAME=mydb make create
****** Makefile.postgis ******
****** Creating database 'mydb'...
****** Loading PostGIS into 'mydb'...
  • Check what has been created and installed: 
    $ DBNAME=mydb make check
****** Makefile.postgis ******
****** Database 'mydb' found
****** Makefile.postgis ******
****** Database 'mydb' is enabled with PostGIS
1.4 USE_GEOS=1 USE_PROJ=1 USE_STATS=1
  • When you don’t need your database anymore, just drop it: 
    $ DBNAME=mydb make drop

LAS Data Triangulation Tool

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Two days ago Martin Isenburg announced new tool added to LASTools package (Martin’s tools where used as an inspiration and foundation to build libLAS package). It’s las2tin program:

A little tool available that triangulates LIDAR in LAS format and stores the result either as a (self-contained) OBJ file or as a list of indexed triangles in ASCII format