Salisbury University: Eric Flint, John O’Brien, & Alex Nohe

Open Source (Public) Geographic Information System GNU General Public License

▪ Guarantees public’s ability to download, modify and share software on this site

Free and Open Source Software (FOSS) Movement Consortium of technically adept people who believe

that software/code should be publically accessible and free

Quantum has greatly benefited from this movement as an alternative to commercial software

Open Source Geospatial Foundation (OSGeo)

Organization whose goal is to build collaborative open source geospatial software and promote its widespread use

Products stored on publically repositories like github.com / bitbucket.org

Quantum has benefited from this effort

Created in 2002 by Gary Sherman Based on GRASS model developed by the US

Army in the 1960’s

Was not satisfied with available commercial GIS products

Cross Platform Cross Platform allows wide range of users ▪ Inoperability with LINUX, Mac and PC operating

systems

▪ Also an App for Android Users

Official website for Quantum

www.qgis.org

Estimated at least 100,000 Globally as of December 2011

Analysis performed by Gary Sherman by geocoding the I.P. addresses where QGIS was downloaded

▪ http://spatialgalaxy.net/2011/12/19/qgis-users-around-the-world/

http://www.gislounge.com/five-reasons-to-start-using-qgis/

http://www.gislounge.com/five-reasons-to-start-using-qgis/

The request for at least familiarity with open source GIS is growing as a desired skill on many GIS job listings

A survey by Eric Pimpler of GeoChalkboard last year on GIS jobs found that 14% of respondents listed open source GIS software as at least a secondary software used in their jobs

http://www.gislounge.com/five-reasons-to-start-using-qgis/

http://www.gislounge.com/five-reasons-to-start-using-qgis/

Free Variety of Geospatial tools for working with

both raster and vector files Viable alternative to paid GIS software for

most applications Catalyst for advances in paid GIS software

industry

Implemented Open Database Connectivity (ODBC)…Esri followed suit.

Bug Reporter on the Wiki

Easy to use website on their hub.qgis.org page to report problems with quantum

Support via forum

Overnight Build for fixes to problems

Open Street Map (OSM) Downloads Plays well with Esri GIS software

Esri Shapefiles

Personal Geodatabases (Not File Geodatabases)

Free You get what you pay for

Limited published reference material No quick start guide

Support via forum No Tech support to call

Not for the un-initiated You have to know and understand basic GIS

operational concepts to function well in Quantum

You should be a tinkerer

Geospatial Data Abstraction Library (GDAL) MapServer PostGIS SPIT GRASS

Core and External C++ or Python Data Provider Plugins Spatial Query Open Street Map (OSM) Web Mapping Services

Quantum offers a variety of Geospatial tools for working with both Vector and Raster Data

Multiple Tools for working with Vector Layers

Import Vector files into Layers

At the end of the process the intersection points will show on layer

Can perform Split, Merge, Joins and Define Coordinates

Multiple Tools for processing Geometry

Random Points in Layer

After Processing – Triangulation Polygons Used for Modeling purposes and determining Density or

Intensity of point sampling

Multiple Tools for Geoprocessing

Select area to be “Clipped” using polygon overlay

After processing…

Input Boundary Layer

After processing… Can choose number of points

Can stratify the sampling design by density and field value

Input Layer

Random Selection of 10 percent of features Selection by desired number of features or desired

percentage of primary layer features

Multiple Tools for working with Raster Layers

Polygonize (Raster to Vector)

Polygonize After Processing…

Contour Input Raster

Contour After Processing…

Where:

Salisbury University,

Salisbury, Maryland

When:

Details are being put together

Expect classes in June.

What:

One week training

Introduction to QGIS (2 days)

Python scripting in pyQGIS (2 days)

Enterprise GIS with Open Source Software (1 day)

Point of Contact:

Dr. Arthur J Lembo

AJLEMBO@salisbury.edu

Explanation of Interface Working with Data

▪ Connecting to Postgres

▪ Concurrent multiple user editing

QPy

Richland, South Carolina

In 1997 Lindau Chemical experienced an explosion in its Columbia plant

Although no chemicals were released it raised concerns regarding the possible effects of ammonia release from this plant among the city leaders and local populace.

We want to determine how many schools could be impacted and how many people would need to be evacuated if a ammonia release occurred at this plant.

Any Questions?

Thank you for attending this workshop!