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2015

The two most important qualities I believe that we seek in job applicants is:  Be Yourself, and Be Curious.  What do I mean?

Be Yourself means being honest about your own job and personal strengths and your own weaknesses, or areas that you are seeking to improve.  Don’t pretend in an interview to be anything you’re not.  Be Curious means asking questions.  This means to ask questions at the interview, of course.  But beyond the interview, on the job and while you are still in school, ask lots of questions. Be curious about the world.  Good questions lead to good investigations. Investigate and solve problems.  If you don’t have some of the skills needed to solve those problems, acquire and practice those skills.

About 5,000 people work at my company, Esri (Environmental Systems Research Institute).   Our headquarters is in southern California (Redlands), we have 10 regional offices in the USA and some smaller satellite offices, and more than 80 worldwide distributor offices.   We are the largest Geographic Information Systems (GIS) organization in the world and as such receive a lot of applications for every job we post.  If you are serious about making a positive difference on our planet with GIS, I encourage you to gain those skills and consider applying at Esri or another organization that fits your own personal ethos!

Esri Headquarters building, Redlands, California

Esri headquarters building, Redlands, California, USA.

Building on past field investigations where I studied the spatial accuracy of GPS receivers and smartphone location apps, I recently compared the spatial accuracy of two location apps on a smartphone.   My goals were twofold:  (1) To determine which of two location apps was more spatially accurate in varied terrain and conditions; and (2) To model a field activity that integrates geography, science, and mathematics that students can engage in easily and effectively.

On a hike in the chaparral hills of Southern California, I used my smartphone to collect my tracks using two apps--Motion X GPS and RunKeeper--at the same time.  Once the hike was done, I then exported the track lines and points as GPX files and uploaded them into ArcGIS Online.  The results, shown below, indicate that the two tracks were quite similar; within 1 meter of each other.  I was pleased with the spatial accuracy of both, despite the very steep terrain and considering that the phone was in my pocket most of the time rather than held up high to capture a theoretically stronger set of GPS and cell tower signals.

It was also evident that in this location, on this day, RunKeeper was a bit more spatially accurate, doing better at maintaining the trail switchbacks as I walked rather than cutting them off.   At one switchback, the two tracks were separated by 4.5 meters.  However, just downhill and to the northeast of the image below, Motion X was more accurate for a specific 10 meter stretch of trail.  It must be remembered, however, that these statements "assume" that the satellite image is the best benchmark of spatial accuracy, but it too contains distortions and error.  Furthermore, on a different day and time, with the GPS constellation in a different array, my results could vary.  Varying the speed walked, the time and date, the location app, the location at which the phone is held, the type of phone, and other factors all make for easy-to-implement field investigations that incorporate science, mathematics, geography, and geotechnologies.  And, while outside, you can have rich discussions on land use, land cover, natural processes, access to open space, animal habitat, climate and weather, and much more, as I do here.  The results are easily examined using ArcGIS Online, and students can also create a presentation or a story map in ArcGIS Online to communicate their results.

Give it a try and comment below on the results of your investigations!
smartphone.jpg

Comparing the spatial accuracy of two smartphone location apps in the field.

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