1. State of the Map 2014
Can Global Navigation Satellite
System (GNSS) change a way of
mapping?
Representative Director
OpenStreetMap Foundation Japan
Hiroshi Miura
2. apologize
● This presentation is made by previous great
studies.
● Special thanks to Mr. Taro Suzuki,
https://taroz.net/
● His extra-ordinary outcome, ex. GNSS-rador
application, help this presentation.
● I've just shared a knowledge which was
learned from these results.
3. Talk plan
● Mapping in Japan
● GNSS/GPS status
● Satellites and mapping
● Simple survey test
● TODO
7. Armchair mapping
● 2010.10 -
● Bing! trace
● Import Yahoo!Japan's map data
● Permission to trace government data by
Geospatial Information Authority of JAPAN
16. GLONASS
● Russia
● Opens in 2007
● Operation 24, total 31 in 2014
● Compatible with GPS
● A high angle(64.8) of inclination
17. Galileo
● EU introduced in 2002
– 4 testbed operated in 2014
– No open operation now.
● 22 satellites budgeted
● Will be opened soon.
18. Beidou/Compass
● China start in 2000
BeiDou Navigation
Satellite System (BDS,
北斗 星 航系卫 导 统 )
● In 2012, 16 satellites
● Regional support
● 30 sat in 2020
the figure is cited from EOPortal by ESA
https://directory.eoportal.org/web/eoportal/satellite-
missions/c-missions/cnss
19. QZSS
● Japan start its complimentary
satellite system QZSS:
Quasi-Zenith Satellite System
● Nickname みちびき
means “Navigator”
● RNSS: Regional Navigation
Satellite System
● Operate 1 sat in 2014
"Qzss-45-0.09" by Tubas - {Systems Tool Kit (STK) - Analytical Graphics Inc www.agi.com}. Licensed under Creative Commons Attribution-Share Alike 3.0 via
Wikimedia Commons - https://commons.wikimedia.org/wiki/File:Qzss-45-0.09.jpg#mediaviewer/File:Qzss-45-0.09.jpg
20. QZSS orbit operation
● 24h cycle
● 3 orbits
● Good for Asia-Pacific
● Minimum 3 satellites
to work
● 4 sat buddged
CC BY-SA 3.0 by Hiroshi FUKUDA
https://commons.wikimedia.org/wiki/File:Qzss-01-120s2.gif
40. ● TODO
– Design improvement
– Test on android versions
– Test with many receiver
● How to join development
– as usual in github
– fork, modify and push
41. Simple accuracy test
Beidou/GPS
used 24 sat
Drifted to south
but good accuracy
GLONASS/GPS
used 19sat
errors with building
13, Sept. 2014
At Jujo, Tokyo
Building < 5
floors
width of road 〜
7m
42. Simple Compare : GPS only
Low accuracy
HDOP 1.3-5.0
4-8 sat used
GPS
receiver
SiRF III
43. Difference?
● There is no big difference?
– GPS only
– GPS+GLONASS
– GPS+BEIDOU+QZSS
● Accuracy improvement to „Meter“ order
44. TODO: Further study
● How to precise positioning to mapping?
– Accuracy: cm order
(ordinal receiver: meter order)
● It should be handy for casual mappers
– Low price, easy to use.
– Other than professional device?
45. TODO: GNSS library
● Free Software for Precision Positioning
● GNSS-SDRLIB(Software Defind Radio
library)
– Process GNSS radio wave directly
– https://github.com/taroz/GNSS-SDRLIB
46. TODO: RTK software
● RTKLIB(Open Source Program Package for GNSS Positioning)
– http://www.rtklib.com/
– sub - meter positioning support
– Google play: RTKGPS+ (Android frontend of RTKLIB)
● goGPS project
– http://www.gogps-project.org/
– improve the positioning accuracy of low-cost (single-frequency)
GPS devices by RTK technique
● Hardware: Android tab + DYI receiver?
47. wrap up
● Changes mapping way
● Precise mapping on survey
● Growing satellites numbers
● Products already support GLONASS
● Simple test with DYI receiver and App