.........................................GIS Flow Data Model: Discussion and Updates

Wednesday, June 28, 2006

The Geographic Dynamics Initiative project officially ends on June 30, 2006. Nevertheless, since this work involves a portion of my dissertation research, sporadic updates will continue on the FDMT site. I also plan to make the license more liberal in the future; due to time, that will probably not happen formally until late summer 2006. Don't forget, all the code for the Flow Data Model Tools is exposed in ArcGIS/VBA-- so you can customize the macros.

Tuesday, April 18, 2006

video walkthrough
I created a video walkthrough of the FDMT. The ten-minute video steps through the process of cartographically representing an interaction matrix in ArcGIS.

The walkthrough is available in two formats: Shockwave (online swf, ~5MB) or Microsoft Media Video (wmv, ~21MB).

Note: The video files seem to be a little temperamental; as expected, the Shockwave version works best with a fast internet connection. As for the wmv files, Internet Explorer loads and buffers them fine, but my copy of Firefox has trouble. If you are using Firefox, Opera, Safari, or Netscape, I suggest saving the wmv file to disk instead of directly opening.

Update: I also created a video walkthrough without sound too. It's three minutes long. The video quickly follows step-by-step through loading the FDMT to creating flow line output. I thought some may find it helpful to have a no-nonsense guide without the additional commentary (wmv, ~1.9MB).

Thursday, January 26, 2006

various comments
A few things:
--I appreciate all the comments about the data model and software. I'm glad people are finding it useful.

--My video/screen capture software expired, so I'll put the video on hold for a bit longer. In the meantime, if you're having trouble, send me an email, and I'll try to help.

--I am preparing a talk on the flow model for a small conference in March. As a side effect, I'll be tweaking the FDMT tools and will post any examples I create.

--I've been toying with a little code for a standalone version of FDMT that can be used with ArcGIS, GML, or KML. After seeing the speedy innovation of others with respect to these formats, and with respect to me getting bogged down in the cartography interface, I will probably simply create a version that outputs as GML. From there, other software can take care of the cartographic choices and visualization. I am looking at the GML specs to gauge the possibilities.

Friday, December 09, 2005

online documentation
I've received several emails for assistance lately. I hope to place a video walkthrough using the FDMT soon.

Monday, September 26, 2005

KML and Flow
Finally making progress on the Flow Tools for KML (including an exporter for the current ArcGIS tools to KML). The screenshot below is an example shapefile to KML export (no flows yet). Click (here) for a larger screenshot.

I've also starting receiving comments on the latest flow model paper -- so I'm working on associated revisions. Thanks to those who provided comments!

Monday, August 08, 2005

flow paper
A draft paper on the development of the flow geographic data model is circulating.

Monday, August 01, 2005

Google API
To support fields influencing flow, I'm working with the new APIs for Google Maps and Google Earth.

Saturday, May 21, 2005

fields and flow
I am now working on -flow influenced by fields-. The use case will be groundwater flow and contamination movement. Some software development may be necessary, and, as it comes available, it will be placed on this site.

Friday, May 06, 2005

sample data remarks
I got an email about a problem with the sample data. Some extra tab and line breaks are being added when saving using internet explorer. As such, I'll work on it and get it fixed. Until then, click on the sample data and once it is showing on the screen, do a "Save As" (a text file) under the File Menu.

Monday, April 18, 2005

AAG Presentation
Alan gave a presentation on the flow data model at the AAG Annual Meeting in Denver. He's been working on a GIScience paper on the model -- particularly relating it to object-oriented concepts' utility within GIS.

Tuesday, February 22, 2005

Sample Data
Here's a small sample dataset: (point file) (interaction table).

Click on these files, let the data show on the screen, and then save as a text file. If you right click from this screen and save, double check that the data are in the proper format; when I used the right click method, the saving process added some extra tab and line delimiters. The result was a mysterious error when using the flow tools.

Friday, January 07, 2005

Online Help
I wrote a short help document for the Flow Data Model Tools. Find the link on the right side of the webpage under Model Tools, or see it here. Thanks to Rhonda Pfaff for a quick edit of the help contents.

Thursday, January 06, 2005

Data for Flow Data Model Tools
I will be uploading some sample data soon. Until then, Tobler's FlowMapper program has several useable sample datasets that can also be used with the Flow Data Model Tools.

Wednesday, January 05, 2005

Flow Data Model Tools
The current version of Flow Data Model Tools (including source code) is now available for download. Download from here.

Tuesday, January 04, 2005

Flow Data Model Tools beta
Several VBA macros have been created to draw flowlines and interact with the Flow Data Model in ArcGIS. I will place an ArcGIS mxd online (which makes the source code visible) in the near future. The tools work with ArcGIS 9.x ArcView (and better) licenses.

Saturday, November 20, 2004

AAG Meeting
I submitted a GIS/Flow abstract for oral presentation at the 2005 AAG Meeting.
back to coding
I'll be doing two major things over the next several weeks: 1) coding and 2) writing a journal article discussing GIS data models for flow information. Also, Mike Goodchild and I will be presenting our latest ideas on flow GIS at the University of Redlands/ESRI colloquium in early December 2004.

Also, I appreciate the assistance from several colleagues with my UCSB Colloquium talk. The following is the acknowledgements slide.

(photo: A. Glennon, 2003/Skogafoss, Iceland)

Tuesday, October 26, 2004

reworked UML diagram
I redrew the Flow Model UML diagram, so it should reproduce better.

Monday, October 25, 2004

Upcoming Presentation
As part of the UCSB Department of Geography Fall 2004 Colloquia, Alan Glennon will be presenting a short talk on the Geographic Dynamics Initiative. The talk will provide an introduction to project, and focus on the GIS flow object model. The presentation will be held at 3:30pm on November 18, 2004, on the UCSB Campus, Buchanon Hall, Room 1920. Check (here) for schedule updates.

Thursday, October 14, 2004

coding progress
Today, I am working on VB/ArcObjects code to allow interaction matrices to be imported into the model. Also, I am continuing work on portions of the code that allow visualization of node-to-node flow.

Wednesday, October 13, 2004

A few screenshots
Here are two thumbnail screenshots of the flow model in action.

stream flow simulationglobal interactions

White Paper: GIS Flow Data Model
Click here to view a white paper on the draft ArcGIS Flow Data Model. The document is in Microsoft Word format (~3.5 meg).
Model Tools:
Flow Data Model Tools v069m (ArcGIS mxd, 420k, link)
Flow Data Model Tools HELP (html, 25k link)

Data Model:
Model White Paper (MS Word, 3.5 meg, link)
Flow Model UML Diagram v01 (GIF, 25k, link)

Tobler's Flow Mapper (link)
NCGIA (link)
CSISS (link)
alanglennon.com (link)


contact: Alan Glennon
(glennon()umail.ucsb.edu) .............................................

This research has been supported by the National Science Foundation under Grant No. 0416208, Jack Dangermond of the Environmental Systems Research Institute (ESRI), and the University of California, Santa Barbara. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation, ESRI, or the University of California.