- What is GeoDa's homepage?
- What is GeoDa?
- What does GeoDa stand for?
- What is the philosophy behind GeoDa?
- What is the philosophy behind GeoDa's help system?
- What are the current GeoDa-related developments?
- What is GeoDa NOT designed to do?
- Who develops GeoDa?
- How many people use GeoDa?
- Who funds GeoDa?
- What characteristics do my data have to have?
- What are the system requirements for GeoDa?
- What are the key components of GeoDa's license agreement?
- Are there licenses to use GeoDa commercially?
- GeoDa citations: How do I cite the use of GeoDa?
- Where to go for GeoDa-related support?
- I think I found a bug - Where do I report it?
- Where do I find out about GeoDa-related training?
GeoDa's homepage is http://geodacenter.asu.edu.
GeoDa is a free software program that acts as an introduction to spatial analysis, designed to implement techniques for ESDA on lattice data (points and polygons). It is intended to provide a user friendly and graphical interface to methods of descriptive spatial data analysis, such as spatial autocorrelation statistics, as well as basic spatial regression functionality. The latest version (0.95i) contains several new features such as a cartogram, a refined map movie, parallel coordinate plot, 3D visualization, conditional plots (and maps) and spatial regression.
GeoDa stands for Geographic Data Analysis (pronounced geo-dah).
GeoDa is designed as a supplement rather than a substitute to existing geographic information systems (GIS) and statistics programs. As a result, it only implements basic GIS functions. The user is able to export much of GeoDa's ESDA output to analyze it further in statistical packages if desired.
Like with other help systems, the goal of this help system is to address user questions as quickly as possible. The help system is geared toward addressing how-to-questions; it is not designed to resolve conceptual questions such as background information on the meaning of a tool, details on the interpretation of results, or field-specific questions pertaining to tools. The help system needed to be cross-platform (thus the choice to develop it in html format), easy to update, as well as accessible and searchable online and offline.
Since GeoDa is designed as an introduction to spatial data analysis, the help system primarily targets researchers new to spatial analysis and geographic information systems. We tried to avoid jargon and included a glossary of terms to assist new users and non-native English speakers. By including references to background literature and formulas implemented in GeoDa, we direct users to more advanced coverage beyond the help system. Experienced users will find the troubleshooting and formula reference pages most useful.
We are currently working on a cross-platform, open-source version of GeoDa (written in C++) that will be compatible with Windows (incl. Vista), Mac, and Linux. This version will have the functionality of the current version, fixes for current bugs/problems, and added regression functionality (e.g., including spatial GMM models with instrumental variables).
GeoDa is not designed for geostatistical analysis with data of a continuous surface or for analysis of categorical data.
GeoDa is developed by Dr. Luc Anselin. He directs an international team of software developers and spatial analysts at the GeoDa Center for Geospatial Analysis and Computation in the Department of Geography at Arizona State University.
GeoDa's user numbers have increased exponentially beyond 40,000 users around the globe (March 2009) since the launching of the program in February 2003.
GeoDa has been funded by several federal and university-based grants, including an initial spatial analysis infrastructure grant by the National Science Foundation.
- Continuously distributed (not categorically)
- Refer to discrete areal units (as opposed to sample points)
- Have no missing values.
- Contain a unique ID
GeoDa runs on Windows operating systems (Windows95 to XP). Cross-platform versions of the software for Windows-Vista, Mac OS and Linux are under development.
Although there are no other system requirements, GeoDa's performance is hardware-dependent for very large datasets (e.g., several hundred thousand observations) and large numbers of variables (e.g., 50,000+). ESDA for very large datasets can be quite slow even on fast machines. On the other hand, for instance, GeoDa's regression models can run under 30 minutes for a dataset of 115,000 observations with 512Mb of RAM.
You are licensed to use GeoDa for free if you are a member of an educational or government institution or use the software at home for non-commercial purposes. You are welcome to install GeoDa in a lab of an educational institution (see Appendix C of the GeoDa User's Guide for installation issues that become relevant with server installations). However, we would appreciate it if you could send us a quick email about the number of lab installations, so we can update our user numbers.
The GeoDa Center and the Arizona Board of Regents of Arizona State University own GeoDa's copyright. Appendix A of the GeoDa User's Guide contains the original license agreement.
Although commercial licenses for GeoDa are not yet available, please contact Luc Anselin if you are interested in using GeoDa commercially.
The correct citation for the use of GeoDa is:
Anselin, Luc, Ibnu Syabri and Youngihn Kho (2006). GeoDa: An Introduction to Spatial Data Analysis. Geographical Analysis 38 (1), 5-22.
Beyond the help system, GeoDa does not come with any support. However, the Openspace listserv provides a forum where users can post questions and answers. The listserv is monitored by the GeoDa development team. Messages are archived.
Check the list of known bugs/problems. If your problem is not on this list, you can report possible bugs on the Openspace listserv that was established to support the GeoDa user community. Past messages of the listserv are archived.
Last updated November 10, 2010