Update ~ 2016-04-21 ~ Request Google Elevation Service

Request for 30 x 30 sample

@fgx/owners

Request Google Elevation Service R1

The idea is to get the data once from Google Maps, save it and be able to display it ever after
Because data is from Google it is likely to be the latest and most accurate data that is readily available
Gathering the data can take a number of minutes, so still not feasible to gather data at run-time

Work-in-progress. Still very hard-wired. Not flexible
Given min and max lat and long, requests data from Google Maps Elevation Service
Parses returned JSON
Displays the elevations found
- Draws bar on screen
Allows you to save elevation data to file
Number of segments per side is a variable you can edit in the source code
Issues
Still working on the minimum delay between requests in order to comply with Google usage limits
Much to learn in general
Road Map
Identify the scale of the map
Indicate typical resolution of the data
- Appears to be ~19 meters for the current map
Add settings for any latitude and longitude
- As well as length and width of area to be covered
Get up to ~1024 sample points per path
- Aim toward suppling data for 1024x1024 segments in a Three.js Plane - about the maximum that display at an OK FPS using current technology
Save to binary data