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Archive for July, 2008 Page 2 of 2

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Create Your Own Gapminder Animated Charts

Published by
Leszek Pawlowicz
 in software and Web apps. Closed

Gapminder is a flash-based tool for creating animated charts based on various parameters and indicators, including geographic areas. Here’s a TED talk showing examples of uses by its developer, Hans Rosling:

Up until recently, you could look at Gapminder charts for specific datasets at the website, but not create your own. Google, which bought the Gapminder technology in 2007, recently released a Google Gadget that lets you create your own Gapminder charts that can be embedded in a web page. You’ll need a Google Docs account, and also need to add the “Motion Chart” gadget from this web page. Once added, it can be accessed from the charts/gadgets button in a Google docs spreadsheet.




GIS On A Stick

Published by
Leszek Pawlowicz
 in GIS. 2 Comments

Jo Cook of Oxford Archaeology has created a portable suite of Windows’ GIS applications that can be run from a thumb drive on any Windows XP/Vista system, or from your local hard drive, with no installation required. Applications include:

  • GRASS, a powerful but complicated GIS
  • Quantum GIS (version 10), a simpler GIS viewer/editor that incorporates some GRASS functionality
  • gvSIG, a full-blown GIS viewer/editor
  • GeoServer, a open-source map server
  • PostGreSQL with the PostGIS extensions, a relational database server (and Xampp, a portable version of the Apache server, to run it on)
  • FWTools, a full suite of command-line utilities for manipulating raster and vector data, along with the OpenEV raster image application  (note: I’ve been unable to get this one to work, but Jo thinks this may be a DLL conflict with an already-installed version of FWTools)

Download the Portable GIS zipped file here (warning: close to 500 MB even in zipped format). A few notes:

- You can run this from your hard drive as well as from a thumb drive, but you need to unzip it to a root hard drive directory, e.g. C:; unzip it to a subdirectory and it will have problems finding files.

- If you’re going to put it on a thumb drive, I’d recommend unzipping it first to a hard drive, then copying the files to the root directory of the thumb drive. Regardless, with about 20K files, it will take several hours to copy them over.

- In the current version (1.2), Portable GIS will only fit on a 2 GB or larger thumb drive in its default configuration. But with a bit of work, you can get it to fit onto a 1 GB thumb drive, and even have 250 MB of free space:

  • Right-click on the thumb drive’s icon, choose “Format”, and select the NTFS file system and Quick Format.
  • Once formatting is complete, close the Format window, right-click on the drive icon, and choose “Properties”
  • Check the box marked “Compress this drive to save disk space”, then click OK.
  • Unzip the Portable GIS files to your hard drive
  • Copy the files and directories over to the thumb drive, but in groups, not all at once; if you try it all at once, you’ll get a message saying there’s not enough room.

You’ll wind up with all the files you need to use Portable GIS, as well as extra space.

- For the thumb drive, double-click on the thumb drive icon; you’ll get a tray icon that clicking on will pop-up menu items for program configuration and running. If you’re running it from a hard drive, run the “PortableGISMenu.exe” app to create the tray icon.

- Before running GRASS, FWTools, or the Apache server using Xampp, run the appropriate setup program for each app to set system variables.

- Use the tray icon menu items to start up all the programs; use the same menu to shut down the GeoServer, Xampp and PostGreSQL applications (just closing the program windows may not work). GRASS, gvSIG and Quantum GIS can be shutdown normally.




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