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BlackChampagne -- no longer new; improvement also in question.: Google Pedometer Hack



Saturday, July 30, 2005  

Google Pedometer Hack


Lanth mailed me this clever and very useful URL the other day, and I've been meaning to share it. The site is here, and what they've done is write an application that loads maps and satellite images from the glorious maps.google.com site, and then allows you to plot distances on it. You just get a map you like, at any magnification, start recording, and double click your way around it, putting in a little marker at every click and drawing a blue line that traces your path. The program calculates the distance travelled as you click.

The example URL Lanth sent me is a trek around the Lafayette Reservoir, where I used to go jogging regularly before I joined the gym to save my knees. (See photos of it here.) I like that one since it tells me the program is largely accurate; it says 2.6506221430230603 miles (It might be just a teensy bit more precise than humans require to plan their walks.) for the route, and the painted lines on the ground around that paved path say 2.7 miles. That's well within the margin for error, considering how many tiny curves and twists the path makes.

While I was there I ha to try mapping the upper reservoir trail, a path that's as steep as any you'll ever walk without a sherpa. It worked nicely and you can see it here, and learn that it's about 5 miles around, though that doesn't give you any hint of the incredible hills you'll have to travel.

The greatest weakness of the program is that it does not measure elevation, but until Google does some magical thing to transform their 2D maps into 3D charts, we'll have to live without it. The program also seems to break when you try to chart very long distances, since the blue lines and markers stop showing up, though it does keep plotting the distance. I measured down the freeways from here to San Diego and got very accurate mileage, even though the lines I'd drawn wouldn't show up in the window. It's still a lot of fun to play with though, and you can map distances "as the crow flies" as well, to surprise yourself with just how close you live to X, once you don't have to follow the roads to get there.
Comments:

With regards to elevation, I did hear a month or two ago that some service provider, I'm not sure whether it was Google or Microsoft, were going to incorporate satellite images taken at 45° angles to the earth.

This is particularly useful for cities, as it gives you a sim-city like view with all the buildings showing their height (rather than just their shadows). I doubt they'll use this service to re-shoot the entire planet though, at least not for several years. I also recall something mentioning at the time that it might be a pay-only service (which makes me think it was Microsoft), but we'll see how things pan out.


 

I saw that service somewhere, and yeah, it required money to access the angled shots. it didn't look very useful from the test views they had; I couldn't much tell depth very well with them and you had to sort of look at the overhead and the diagonal side by side and estimate from them. But perhaps it'll be improved with further refinements.


 

What about Google.earth? Would it work with that application, as that one does give the somewhat of a 3d view.


 

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