OSM and the Art of Bicycle Maintenance Etienne Cherdlu State of the Map – July 14, 2007 Quantity and Quality

Introduction ZEN and the Art of Motorcycle Maintenance. 1974, Robert M Pirsig What follows is based on actual occurrences. … However, it should in no way be associated with that great body of factual information relating to orthodox Zen Buddhist practice. It's not very factual on motorcycles, either.

ZEN and the Art of Motorcycle Maintenance. 1974, Robert M Pirsig

What follows is based on actual occurrences. … However, it should in no way be associated with that great body of factual information relating to orthodox Zen Buddhist practice. It's not very factual on motorcycles, either.

What’s the book about? Motorcycle + Quality = Zen

Motorcycle + Quality = Zen

What’s the book about?

What’s the book about? “Assembly of Japanese Bicycle requires great peace of mind”

“Assembly of Japanese Bicycle requires great peace of mind”

Quantity and Quality Quantity How far have we got? Quality How good is OpenStreetMap? “ Quality is the continuing stimulus which our environment puts upon us to create the world in which we live. All of it. Every last bit of it. “ Robert M Pirsig.

Quantity

How far have we got?

Quality

How good is OpenStreetMap?

Quantity Are we there yet, Dad? How much has been done? How much is there to do? How long will it take? How will we know when we get there?

Are we there yet, Dad?

How much has been done?

How much is there to do?

How long will it take?

How will we know when we get there?

How much has been done? Planet.osm = 4Gb London seems to be about 50% complete UK seems to be about 50% Major UK cities still missing: Hull, Bradford Europe: 25% Netherlands 100% (0.25% of the planet) Germany 35% ? Scandinavia 50% ? We really don’t have any good measures yet

Planet.osm = 4Gb

London seems to be about 50% complete

UK seems to be about 50%

Major UK cities still missing: Hull, Bradford

Europe: 25%

Netherlands 100% (0.25% of the planet)

Germany 35% ?

Scandinavia 50% ?

We really don’t have any good measures yet

What metrics should be used? By area By population By Country, State, City, Town By road number By level of completeness

By area

By population

By Country, State, City, Town

By road number

By level of completeness

How long will it take?

How long will it take? Metrics: Survey time + tagging time Measure by population for urban areas Urban: 1 hour surveying + 1 hour tagging = 1,000 population UK: Population: 66 million 85 man years or 700 OSMer years 1 OSMer per 100,000 population Planet: Population 6.6 billion 8,500 man years or 70,000 OSMer years Other effects (Yahoo! Imagery, donated data, etc). How quick will the project grow? What are the limiting factors?

Metrics: Survey time + tagging time

Measure by population for urban areas

Urban: 1 hour surveying + 1 hour tagging = 1,000 population

UK: Population: 66 million

85 man years or 700 OSMer years

1 OSMer per 100,000 population

Planet: Population 6.6 billion

8,500 man years or 70,000 OSMer years

Other effects (Yahoo! Imagery, donated data, etc).

How quick will the project grow?

What are the limiting factors?

How long will it take?

How will we know when we get there? Will we ever “get there”? Definitions of completeness Milestones Measurement

Will we ever “get there”?

Definitions of completeness

Milestones

Measurement

Quantity and Quality Quantity How far have we got? Quality How good is OpenStreetMap? “ Quality is the continuing stimulus which our environment puts upon us to create the world in which we live. All of it. Every last bit of it. “ Robert M Pirsig.

Quantity

How far have we got?

Quality

How good is OpenStreetMap?

Aspects of Quality - Dataset Accuracy Topological Positional accuracy (<10m) Stepwise refinement Completeness Consistency … of tagging highway=footway highway=footpath … of meaning Level of Detail (the more the better?) Quote your Sources (GPX, Yahoo!, NPE, photos etc) Defence against copyright allegations Survey date

Accuracy

Topological

Positional accuracy (<10m)

Stepwise refinement

Completeness

Consistency

… of tagging

highway=footway

highway=footpath

… of meaning

Level of Detail (the more the better?)

Quote your Sources (GPX, Yahoo!, NPE, photos etc)

Defence against copyright allegations

Survey date

Aspects of Quality – Up-to-date

Aspects of Quality – Up-to-date

Aspects of Quality – Up-to-date

Aspects of Quality – Fitness for Purpose Maps Route planning Appropriate license Types of user: Motorist Cyclist Rambler / walker Urban pedestrian

Maps

Route planning

Appropriate license

Types of user:

Motorist

Cyclist

Rambler / walker

Urban pedestrian

Potlatch JOSM Yahoo! Imagery NPE Landsat Maplint Map features Internationalisation Aspects of Quality – Ease of Contribution

Potlatch

JOSM

Yahoo! Imagery

NPE

Landsat

Maplint

Map features

Internationalisation

Aspects of Quality – Software ROAD MAP!!! What functionality is needed? How do we get there from here?

ROAD MAP!!!

What functionality is needed?

How do we get there from here?

Aspects of Quality – Service Level Server availability Scalability Performance Availability Test server / upgrades

Server availability

Scalability

Performance

Availability

Test server / upgrades

Aspects of Quality – Scope of Services API planet.osm Map publishing (Mapnik and Tiles@Home) Geoname / postcode search Route planning service

API

planet.osm

Map publishing (Mapnik and Tiles@Home)

Geoname / postcode search

Route planning service

Aspects of Quality - Community TIGER: Public domain Static Complete Inaccurate Out-of-date OpenStreetMap: CC-BY-SA Dynamic Incomplete Accurate ? Up-to-date

TIGER:

Public domain

Static

Complete

Inaccurate

Out-of-date

OpenStreetMap:

CC-BY-SA

Dynamic

Incomplete

Accurate ?

Up-to-date

How easy is it for users of our data to provide feedback to the project? Feedback from users of the maps Feeds from local authorities Protection from vandalism Is CC-BY-SA the right kind of feedback loop? Is the wiki model the right model? Aspects of Quality – The feedback loop

How easy is it for users of our data to provide feedback to the project?

Feedback from users of the maps

Feeds from local authorities

Protection from vandalism

Is CC-BY-SA the right kind of feedback loop?

Is the wiki model the right model?

Quality Vectors What are the factors that drive and determine quality? Availability Metrics Feedback loop Community Acceptance and use A person who knows how to fix motorcycles... with Quality... is less likely to run short of friends than one who doesn't. Robert M Pirsig.

What are the factors that drive and determine quality?

Availability

Metrics

Feedback loop

Community

Acceptance and use

What’s OpenStreetMap about? Bicycle + Quality = OSM

Bicycle + Quality = OSM