HkGeo

Description

A Geo location conversion API for HK.

Dependency

• mechanize
• rest-client
• json
• nayutaya-googlemaps-polyline
• hoe (build)

Install

gem install hk_geo

Usage

Conversion API

By default, convert the HK80 location to WGS84/ITRF96

require ‘hk_geo’
result = HkGeo::Converter.convert(“835352.749”, “815640.774”)

[“22.457521648”, “113.976469709”]

You may specify other conversion

require ‘hk_geo’
result = HkGeo::Converter.convert(“835352.749”, “815640.774”, HkGeo::SYSTEM_HK80, HkGeo::SYSTEM_ITRF96, HkGeo::UNIT_DM)

[“22.2745130”, “113.5858818”]

Route Finder API

Use two coordinate to find the route between

data = HkGeo::RouteFinder.route(“22.445663383,113.983328736”, “22.444075388,113.984268260”)

[[22.44557, 113.98324, 3], [22.44487, 113.9839, 0], [22.4431, 113.98512, 1], [22.4424, 113.98548, 0], [22.44182, 113.98568, 0], [22.44122, 113.98581, 0], [22.44078, 113.98582, 1], [22.44044, 113.98581, 0], [22.43885, 113.98556, 0], [22.43727, 113.98526, 0], [22.43569, 113.98487, 1] … (skipped)

Rake Task

Find route in “Traffic Speed Map” from Hong Kong Government.

rake route

Check the test for more info.

Credit

The conversion api rely on the online conversion tool from Survey and Mapping Office. http://www.geodetic.gov.hk/smo/tform/tra_tform.aspx

The rake task originally from “Data Download for Traffic Speed Map” from GovHK Data.One (http://www.gov.hk/tc/theme/psi/datadownload/traffic.htm), process by waterlou (https://github.com/waterlou).

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request