GIS on Rails

Aug 29, 20151 like538 views

Pivorak MeetUp

Presentation from Serge Tyatin (@2rbas) Appeared on 3rd #pivorak Lviv Rub MeetUp

GIS on Rails
Сергій Тятін Full-stack web developer

GIS
1. Трохи теорії
2. Інструменти
3. PostGiS SQL

Datum WGS 84
Датум (лат. Datum) — набір параметрів, які
використовуються для зміщення і
трансформації референц-еліпсоїду в
локальні географічні координати.

SRID
Spatial Reference System Identiﬁer
SRID=4326;POINT(24.0267731
49.8386644)
SRID=3785;POINT(2674648.14689752
6418382.09688131)

Інструменти
• PostGIS (http://postgis.net/)
• gem ‘rgeo’
• gem 'activerecord-postgis-adapter’

PostGIS
• Geometry, Geography functions
• Data types: POINT, LINESTRING, POLYGON, CURVE ..

gem ‘rgeo’
• репрезентація данних
• базові функції

gem ‘activerecord-postgis-
adapter’
The activerecord-postgis-adapter provides access to
features of the PostGIS geospatial database from
ActiveRecord

Історія створення стартапа для
car-pooling

Як працює
Дошка оголошень
Маршрути водіів
Запити пасажирів
Матчінг

geometry ST_MakeLine(geometry
set geoms)

geometry ST_Simplify(geometry
geomA, ﬂoat tolerance);

Порівняння маршрутів
• Мають починатися і закінчуватись поряд
• Мають проходити поряд

boolean ST_DWithin(geography gg1,
geography gg2, double precision
distance_meters);

Мають починатися і
закінчуватись поряд
SELECT
FROM routes WHERE
ST_DWithin( ?, routes.start, 500)
AND
ST_DWithin( ?, routes.end, 500)

ﬂoat ST_HausdorﬀDistance(geometry
g1, geometry g2);
SELECT * FROM (
SELECT ST_HausdorﬀDistance(routes.route, ? )
as distance, …
FROM routes WHERE
ST_DWithin( ?, routes.start, 500)
AND
ST_DWithin( ?, routes.end, 500)
) ORDER BY distance ASC LIMIT 1

Знайти маршрути для
пассажира
start
ﬁnish
• Місце зустрічі/виходу близько
• Де найкраще зустрітись/вийти
• Напрямок має значення

Місце зустрічі/виходу
близько
SELECT
FROM routes
WHERE
ST_DWithin(routes.route, ?, 500 )
AND 
ST_DWithin(routes.route, ?, 500 )

Де найкраще зустрітись/вийти
Найближча точка
geometry ST_ClosestPoint(geometry g1, geometry g2);

Де найкраще зустрітись/
вийти
SELECT
ST_ClosestPoint(route, ?) as pickup_location, 
ST_ClosestPoint(route, ?) as drop_location,
FROM routes
WHERE
ST_DWithin(routes.route, ?, 500 )
AND 
ST_DWithin(routes.route, ?, 500 )

Напрямок має значення
Маємо вибрати тільки ті маршрути які йдуть від
точки старт до точки фініш
ﬂoat ST_LineLocatePoint(geometry a_linestring,
geometry a_point);
Повертає значення між 0 та 1 яке визначає
положення найближчої точки на лінії до заданої
точки

Напрямок має значення
SELECT
ST_LineLocatePoint(route, ?) as pickup_ﬂoat, 
ST_LineLocatePoint(route, ?) as drop_ﬂoat,
ST_ClosestPoint(route, ?) as pickup_location, 
ST_ClosestPoint(route, ?) as drop_location,
FROM routes
WHERE
ST_DWithin(routes.route, ?, 500 )
AND 
ST_DWithin(routes.route, ?, 500 )

Дякую за увагу
Сергій Тятін
700@2rba.com
skype: tyatin
DRIDER.IO

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GIS on Rails

1. GIS on Rails Сергій Тятін Full-stack web developer

2. GIS 1. Трохи теорії 2. Інструменти 3. PostGiS SQL

3. Geoid

4. Datum WGS 84 Датум (лат. Datum) — набір параметрів, які використовуються для зміщення і трансформації референц-еліпсоїду в локальні географічні координати.

5. Mercator projection

6. SRID Spatial Reference System Identiﬁer SRID=4326;POINT(24.0267731 49.8386644) SRID=3785;POINT(2674648.14689752 6418382.09688131)

7. Інструменти • PostGIS (http://postgis.net/) • gem ‘rgeo’ • gem 'activerecord-postgis-adapter’

8. PostGIS • Geometry, Geography functions • Data types: POINT, LINESTRING, POLYGON, CURVE ..

9. gem ‘rgeo’ • репрезентація данних • базові функції

10. gem ‘activerecord-postgis- adapter’ The activerecord-postgis-adapter provides access to features of the PostGIS geospatial database from ActiveRecord

11. Історія створення стартапа для car-pooling

12. Як працює Дошка оголошень Маршрути водіів Запити пасажирів Матчінг

13. Запис маршрута водія

14. GPS locations

15. geometry ST_MakeLine(geometry set geoms)

16. Алгоритм Рамера — Дугласа — Пекера

17. geometry ST_Simplify(geometry geomA, ﬂoat tolerance);

18. Порівняння маршрутів • Мають починатися і закінчуватись поряд • Мають проходити поряд

19. boolean ST_DWithin(geography gg1, geography gg2, double precision distance_meters);

20. Мають починатися і закінчуватись поряд SELECT FROM routes WHERE ST_DWithin( ?, routes.start, 500) AND ST_DWithin( ?, routes.end, 500)

21. Мають проходити поряд

22. Відстань Гаусдорфа

23. float ST_HausdorffDistance(geometry g1, geometry g2); SELECT * FROM ( SELECT ST_HausdorffDistance(routes.route, ? ) as distance, … FROM routes WHERE ST_DWithin( ?, routes.start, 500) AND ST_DWithin( ?, routes.end, 500) ) ORDER BY distance ASC LIMIT 1

25. Знайти маршрути для пассажира start ﬁnish • Місце зустрічі/виходу близько • Де найкраще зустрітись/вийти • Напрямок має значення

26. Місце зустрічі/виходу близько SELECT FROM routes WHERE ST_DWithin(routes.route, ?, 500 ) AND  ST_DWithin(routes.route, ?, 500 )

27. Де найкраще зустрітись/вийти Найближча точка geometry ST_ClosestPoint(geometry g1, geometry g2);

28. Де найкраще зустрітись/ вийти SELECT ST_ClosestPoint(route, ?) as pickup_location,  ST_ClosestPoint(route, ?) as drop_location, FROM routes WHERE ST_DWithin(routes.route, ?, 500 ) AND  ST_DWithin(routes.route, ?, 500 )

29. Напрямок має значення Маємо вибрати тільки ті маршрути які йдуть від точки старт до точки фініш ﬂoat ST_LineLocatePoint(geometry a_linestring, geometry a_point); Повертає значення між 0 та 1 яке визначає положення найближчої точки на лінії до заданої точки

30. Напрямок має значення SELECT ST_LineLocatePoint(route, ?) as pickup_ﬂoat,  ST_LineLocatePoint(route, ?) as drop_ﬂoat, ST_ClosestPoint(route, ?) as pickup_location,  ST_ClosestPoint(route, ?) as drop_location, FROM routes WHERE ST_DWithin(routes.route, ?, 500 ) AND  ST_DWithin(routes.route, ?, 500 )

31. Дякую за увагу Сергій Тятін [email protected] skype: tyatin DRIDER.IO

GIS on Rails

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