April 2014
Beginner
576 pages
12h 53m
English
Content preview from iOS App Development For Dummies
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Chapter 18
Geocoding
In This Chapter
Understanding geocoding
Getting a feel for reverse geocoding
Displaying the address of the user’s current location
There are two basic ways of identifying where you are on Earth. You can describe your location in coordinates of latitude and longitude, or you can describe your location in terms of an address. The latitude and longitude coordinates are based on geometry (remember Euclid) and on the assumption that the Earth is a regular sphere.
Addresses are based on history and politics. The geographic coordinates of the city now known as St. Petersburg have not changed over time (yes, I know that continental drift has an effect, but to all intents and purposes, it has been in the same place since its founding by Tsar Peter the Great on May 27, 1703). However, St. Petersburg’s name was changed to Petrograd, then to Leningrad, and after that back to St. Petersburg.
Despite the fact that geographic coordinates of a spot on Earth are essentially unchanging and the addresses are subject to change, most people commonly use addresses to describe locations on Earth. Most software that deals with mapping works with geographic coordinates, and it converts ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.