Mapping Tools

Google Earth Pro showing a 1940 Travis County Highway Map overlay and some waypoints

Continuing on the mapping theme, I wanted to talk about a few tools I use for my mapping activities.

MapSource

I use an old Garmin eTrex Legend GPS receiver for my geocaching hobby and backwoods exploration. I purchased Garmin’s MapSource Topo in 2004, and I still use it today. The software isn’t updated much anymore, but it reliably moves waypoint and track data to and from my receiver. My map database is still original, but it isn’t a big issue as I don’t tend to use the unit for street navigation. I usually save “raw” field data in .gdb files, and also save a copy where I’ve cleaned up the tracks or edited waypoint symbology and labels. These files can be converted / imported into the programs below.

Google Earth Pro

I know most people know about Google Maps in their on-line or phone app form. Fewer people know about the free, downloadable PC/Mac app called Google Earth Pro. In addition to allowing you to view zoom-able maps of the entire globe, you can also make your own maps to share with others. The features I use are:

  • Satellite basemaps (recent historical imagery is available)
  • Track and waypoint overlays from my collected GPS data
  • Photo overlays of old maps and aerials (zoomed and rotated)
  • Getting coordinates of features in the overlays and basemaps.

You can also make cool map fly-over videos. It’s an awesome tool and a great place to start learning about making maps.

ArcGIS / ArcMap

Sometimes you need the real deal for mapping. In my case, I found that building a composite aerial map of around 16 photos in Google Earth Pro was bogging down the computer I was using. I also needed to stretch a hand drawn map in a non-uniform way to match the basemap. That task exceeded the capabilities of Google Earth Pro’s zoom and rotate (AKA affine transformation).

Esri’s ArcGIS / ArcMap does all of this work very well. It’s not so easy for casual users without mapping experience, but it’s definitely the way to go for people who are really into this stuff. It lets you stretch maps and aerial images to fit other maps (georeferencing) and uses variable image resolution to speed screen update time. This is the tool that makes most of the print maps you see today. I’ve completed a lot of on Esri’s on-line courses. It’s the next best thing to community college courses on the subject. I find learning this tool to be quite engaging, especially when paired with my interest in local history.

QGIS

QGIS is another fantastic Geographical Information System program. It’s open source and free to use. It has many of the features of ArcGIS and its components. I did have great success in using the program to get beyond my issues in assembling the previously mentioned composite. On-line training is also readily available. I stopped using the program when I decided to start learning the more mainstream ArcGIS.

My Addiction to Maps

If you read my last blog post about Rutledge Spur, you might have noticed I’m into maps and aerial photos. I’m not just sort-of into them. Definitely addicted.

I’m not really sure when it started. I can vividly recall an early memory from when I was 7 years old. My family was moving from Ohio to Arizona and the moving company had supplied us kids with maps and an atlas. I remember following along from the back seat of our Fury III as we got to each town along the way, marking the progress along the highways we traveled. I was already pretty comfortable with maps at the time.

In grade school, a graduate student from the University of Arizona came to try to find out what skills our young minds used for navigating. He brought an aerial photo of the area around the school, and told me to walk us to a spot he was pointing at on the photo. I’d never had access to an aerial that showed our neighborhood before. My first question was “Where do you get these?” I knew it didn’t come from the gas station. I was thrilled to show him how to get there, using my skills counting streets, turns, and houses, but also using visual cues like trees and driveway styles. That guy did not expect a 4th or 5th grader to have that knack yet. He also told me he borrowed the photos from the U of A library. “Mom? Can we go there?” It turned out the graduate student’s borrowing privileges were higher than my elementary student privileges.

I enjoyed learning orienteering, compass, and mapping skills in the Boy Scouts. Gaining access to great topographical maps of the Santa Catalina Mountains fed my addiction, also prompting me to ask where they’d come from. That’s where I found out about Tucson Map and Flag. “Mom? Can we go there?” Alas, time, distance, and money kept me away.

In college, my eclipse chasing buddies were into maps too. At one point my housemate had plastered an entire wall with adjoining sections of the Baja peninsula. By then, I was able to provide transportation on a few trips to the map store.

My interest in aerial observation also stemmed from an interest in flying. I’m a window seat guy with a sore neck. I complteted ground school for becoming a private pilot and also did a few hours of flight time, but job changes kept me from continuing toward that goal at a couple of critical points. I still have lots of old aeronautical charts from those days.

As a defense contractor employee, I learned to use early military GPS receiver data streams at work. When they made accurate GPS available to regular citizens, Geocaching became possible. That was a real marriage of tech and the outdoors. That turned out to be a great match for me. Wow, how great is it that we have all this stuff on our smart phones now?

So, what’s the big draw maps for me? Probably the alternate way of looking at the world around me. Sometimes it’s getting the big picture: “How big is this park?” Sometimes it’s time travel: “What was here before?” Sometimes it’s getting there: “What way do I go?” And sometimes it’s a treasure hunt: “There’s something here I want to see.” The ultimate “treasure” for me is finding out something unexpected or unusual about a place.