[GIS/FCD/Map-Matching] Map-Matching using Yingyan Trace by BMap API

Map-matching algorithms integrate positioning data with spatial road netwok data to identify thr correct link on which a vehicle is travelling and to determine the location of a vehicle on a link. Various map-matching algorithms has been derived from literatures.

BMap recently  released a service named Yingyan Trace, which offered users APIs to upload positioning points, generate and manage traces, and map discrete GPS points to continuous trajectories based on road network.

Preparation

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Floating Car Data

Floating car data (FCD) is collection of GPS records about driving status, regularly sampled from GPS equipment in vehicles.

GPS records of a taxi on Nov. 18th, 2014, were used to this case study.

ID: 1379

Records in total: 616

While adjacent points are lined, lines do not coincide with road network.

BMap API Key

Create an application on BMap API Console, and get a API key.

 

UPload

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 API Description

http://lbsyun.baidu.com/index.php?title=yingyan/api/v3/trackupload

addpoint - Upload a single point

Interface Description
upload a track point for an entity

Request URI
URI：http://yingyan.baidu.com/api/v3/track/addpoint

HTTP Request Mode
POST

Request Parameter


Return Value

Uploading

Transformat records to wget post request:

Example:  wget –post-data=”ak=0QG***SRL&service_id=13**16&entity_name=1379&longitude=116.***090&latitude=39.***810&loc_time=1479258504&coord_type_input=wgs84&load= ” http://yingyan.baidu.com/api/v3/track/addpoint

 

Manage

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Trace Management Console

Map-Matching: tied road network

DOwnload

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API Desctiption

http://lbsyun.baidu.com/index.php?title=yingyan/api/v3/trackprocess

gettrack - trajectory correction

Interface Description
Real-time query for an entity within a period of time travel information: from the end, the total mileage, fees mileage, track point list. Support for track denoising, pumping thin, tied, mileage compensation and so on.

Request URI
URI: http://yingyan.baidu.com/api/v3/track/gettrack

HTTP Request Mode
GET

Downloading

Request following url and get a json file with map-matching results in return:

http://yingyan.baidu.com/api/v3/track/gettrack?ak=0QG***SRL&service_id=13**16&entity_name=1379&start_time=1479258504&end_time=1479344904&is_processed=1&process_option=%22need_mapmatch=1%22&sort_type=asc&page_size=5000

Visualization in ArcMap