Thursday, May 19, 2011

Joseph Kerski on Scale!

Check out Joseph Kerski's new Video and Blogs on why scale matters in GIS.

Video: Click Here

Joseph Kerski is Education Manager at ESRI - Environmental Systems Research Institute, Inc.

Thursday, May 5, 2011

GPS vs. SmartPhone!

Joseph Kerski, Education Manager with ESRI, conducts two experiments comparing the accuracy of the horizontal position of a SmartPhone vs. that of a GPS receiver. His results show that while the SmartPhone's data is more current and precise than that of the GPS, the GPS's data is far more accurate.

To learn more about Kerski's experiments, please click on the following links:
Comparing a GPS vs. SmartPhone, Part 1 of 2
Comparing a GPS vs. SmartPhone, Part 2 of 2

To learn more about the accuracy of iPhone locations, please click on the following article by Paul Zandbergen, Department of Geography, University of New Mexico:

Zandbergen, Paul A. 2009. Accuracy of iPhone Locations: A Comparison of Assisted GPS, WiFi, and Cellular Positioning. Transactions in GIS, 13(s1): 5-26

Have you used your cell phone for GPS positioning?