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What we will be covering
•
Links and Relevant Ecosystem of Open Source GIS and
OpenGIS
•
Glossary of Terms
•
Tools to Load/Extract spatial data from PostGIS
•
Proximity Queries with PostGIS 1.5+
•
OpenLayers
•
Using OpenStreetMap as a base layer on a map
•
Using WMS Layers in OpenLayers
•
Geoserver and MapServer
•
Publishing PostGIS data with WMS
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Publishing PostGIS data with WFS
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Roll your own custom layers using PostGIS output functions
•
Enhancing OpenLayers with GeoExt
Links and Relevant Ecosystem of Open Source GIS
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http://www.postgis.org PostGIS Website: (its now an OSGEO incubation project)
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http://trac.osgeo.org/postgis PostGIS community and bug tracker. Also contains user contributed code snippets, tips, and links.
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http://www.osgeo.org/ OSGEO – Open Source Geospatial Foundation, provides hosting and other resources to the Open Source GIS community and
OSGEO projects.
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http://postgisonline.org PostGIS Online – work in progress started by Nicklas Avén, one of the core PostGIS developers. It allows you to experiment
with PostGIS spatial queries in a database sandbox. Uses Mapserver for displaying query on a map. Also has some step by step tutorials.
•
http://openlayers.org OpenLayers – Javascript Framework we’ll be demonstrating. Was started by MetaCarta, a local Cambridge,MA company and later became
an OSGEO project. BSD style license.
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http://geoserver.org GeoServer – a Java Servlet written web mapping server we’ll be covering and is also an OSGEO incubation project. GPL licensed.
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http://www.mapserver.org/ MapServer - a C written web mapping server. The first OSGEO project and also the first mapping server to support PostGIS. MIT
style licensed.
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http://www.codeplex.com/SharpMap - both a web and desktop mapping toolkit written in C#. Used often to create ASP.Net and more recently
Silverlight apps. PostGIS was one of the first data sources it supported. LGPL licensed.
•
http://geoext.org – GeoExt is a mapping javascript toolkit that combines the power of OpenLayers for mapping and ExtJs for general Rich Internet Application (RIA)
building. Its BSD licensed.
•
http://www.extjs.com – A very popular javascript framework for building RIA. Comes packaged with various graphical widgets that can be stretched, moved on
screen etc.
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http://www.opengeospatial.org/ Open Geospatial Consortium (OGC) standards making body for geospatial and location based services. Most of the
high end GIS vendors are on the committee as well as many open source GIS members. It tries to improve ease of interoperability between the various
tool sets.
OUR SATELLITE SITES
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http://www.postgis.us – PostGIS in Action book site – contains code downloads, eventually demos of what is in book, presentations we’ve done, useful PostGIS
links.
We are co-authors of the upcoming Manning book, PostGIS in Action, due out in hard-copy in Summer 2010. You can purchase now via the Manning Early
Access Program (MEAP) and read chapters as we complete/update them. First chapter is a free download. Have almost all the chapters complete and on MEAP.
•
http://www.bostongis.com – BostonGIS.com is focused on Open Source and Open Geospatial standard tips and tricks.
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http://www.postgresonline.com – Postgres OnLine Journal is focused on providing a resource for PostgreSQL users and newcomers by providing examples that
demonstrate PostgreSQL’s unique features, and how to use PostgreSQL effectively. Each edition available as free PDF. We try to release monthly/bi-monthly.
Glossary Of Terms
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EPSG – European Petroleum Survey Group – they are the authority for a lot of the spatial reference systems used today.
In SRS you’ll see their initials prefixed EPSG
•
ESRI Shapefile – kind of the defacto standard of data transporting for GIS. Pretty much every GIS desktop tool and Open
source GIS desktop tool, loaders etc support it. Most vector spatial data you can download is in this format. Created by
Environmental Systems Research Institute (ESRI) which is the big bad fish vendor in the GIS world. It has a .shp/.shx to
store the geometry part and a dbf to store the regular attribute data.
•
GeoJSON – http://geojson.org/ Geography Javascript Object Notation. New standard. In OGC draft spec. Combines JSON
serialization of attribute and adds to it how geometry objects should be serialized as JSON.
•
GEOS – Geometry Engine Open Source – the engine used for many of PostGIS advanced functions. C++ based.
•
GML – Geography Markup Language. A data transport XML format standard of OGC often used to output WFS requests
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KML – Keyhole Markup Language – another XML standard that includes stylistic features, popularized by Google, and
later adopted as a transport standard by OGC.
•
OGC – Open Geospatial Consortium – standards body for Geospatial interoparability between products
•
OSGEO – Open source Geospatial Foundation – incubator of many open source projects including PostGIS and GEOS
•
SRID – Spatial Reference Identifier – this is the primary key (usually a number) in a spatial reference system catalog of
options. It is common terminology for OGC spatial databases.
•
SRS (ID) – Spatial Reference System. This is similar in concept to spatial database SRID. It defines the coordinate
system, projection, and datum of spatial data. Most common ones you’ll see are EPSG:4326 (WGS 84 long lat),
EPSG:3875 (Web Mercator), EPSG:900913 (Web Mercator old SRS before Web Mercator became a EPSG
standard). In fact PostGIS loaded list of SRIDS have just the numbers 4326, 3875, etc.
•
WGS – World Geodetic System standard for defining geodetic data, ellipsoid and geoid models that is the foundation of
many spatial reference system. Long Lat data using a reference ellipsoid. Common one used is in WGS 1984.
•
WFS – Web Feature Service – another web mapping standard created by OGC for outputting vector and attribute data.
•
WMS – Web Mapping Service – one of the standards defined by OGC
Open Source Tools to Load Data and Extract Data
shp2pgsql
Command line data loader packaged with PostGIS
Imports standard ESRI Shapefiles and DBFs* into PostGIS geometry/geography
shp2pgsql-gui
GTK based Graphical user interface data loader with more or less same functionality
as the command line loader. Also packaged with PostGIS 1.5.0+. Note: Not pre-
packaged with all distributions so you may need to compile yourself. Available for
windows distributions via StackBuilder.
pgsql2shp
Command line tool packaged with PostGIS that allows you to export spatial tables
and ad-hoc queries to ESRI Shape file format
OGR2OGR/GDAL http://fwtools.maptools.org/
Open source tool packaged in FWTools
Imports 20 different vector and flat file formats and various raster formats. Driver
currently being developed to load into new PostGIS WKT Raster type.
Spatial Data Integrator http://www.spatialdataintegrator.com/
ETL tool with geospatial capabilities and graphical workbench. It is based on Talend Open
Studio.
Geokettle http://sourceforge.net/projects/geokettle/
This is the geospatial equivalent of Pentaho Data Integration (Kettle). Supports out of the
box PostGIS, Oracle Spatial, MySQL, ESRI Shapefiles. It can run as a web service.
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