Technicalities

Presenters

Nishanta Khanal

Suresh Manandhar

David Nhemaphuki

Upendra Oli

Niroj Shrestha

Points of Discussion

Servers

Clients

Data Storage

Data Format

Technical Issues

OSM SERVERS

OSM Servers

Servers named as dragons as in ‘here be the dragons’

Servers are located in various places

People can even build their own OSM servers

A Sample List of Running Servers As of 2013 March

Building your own OSM Server!!!

Do we need to build our own OSM server? No, The data is available on the internet and maintaining

a server is a tough job

Then why build an OSM Server? Ever thought of displaying thematic maps from OSM

maps?

Check out opencyclemap.org

The steps are simple

Install a server (preferably Ubuntu Hardy Heron 8.04 LTS)

Get the data (download it)

Install the database

Mapnik from source to render maps

You are ready to go!!

OSM CLIENTS

OSM Clients

We all use OSM data so shouldn’t we all be clients? Not on technical terms.

Clients are day to day devices or computers accessing and downloading OSM data

One can configure any modern device with a computer chip into an OSM client

Devices capable of Running OSM

Requisites for a device to be a Client

No requirements needed to be fulfilled in particular.

Device needs a software capable of downloading and displaying OSM data.

Device needs to be capable of running the software.

Some Software used to access OSM data

JOSM

E-OSM Client

Potlatch (an online tool)

Name, Link Genre Language Descriptionfree

materials

AddisMap Local, POIEnglish አማርኛ, Deutsch

Addis Ababa (Ethiopia) City Map with POI locator

?

Bigmap [1] Render English Tool to create big maps Yes

BigTinCan Maps Speed limit EnglishAsia map that displays max speed, too

Yes

BuioMetria Partecipativa

Crowd, Weather

italianoDisplays darkness of the sky measured with Sky Quality Meter.

?

Bicycle Routes by Pifpafpuf

Biking, Export, GPS, Planning, Tool

EnglishCreate and download gpx tracks or edit your uploaded ones for planning routes by bike.

Partial (OSM

Mapnik + Openlayer )

Chimère Tool, Mashup françaisOSM based Portal framework to add own POIs on top.

Yes

Crowdmap Social, Crowd Englishcollect social or crisis data and display them on a map

?

digitaler-lageplan Tool Deutsch OSM data in various formats ?

Distance Calculator Tool EnglishCreate paths, measure length and export to .GPX or .KMZ

?

Some Blocked Softwares

Some applications for phones and desktop computers that download far too many map images from osm server that slows down the servers, it also makes it harder for our mappers to draw the maps – which is osm whole reason for being.

At one point one single application was responsible for 30% of the traffic going through osm servers.

OSM has a clear tile usage policy which asks applications making heavy use to set up their own map image servers, or use third party servers.

E.g. Mobile Atlas Creator, NaviComputer, Locus, OPenMaps, OMaps

OSM Data Storage

Where can be data stored?

Server

Clients

Other data storage devices

Database statistics as of 28th March 2013

This curious map of the world, shows the result of dividing the OpenStreetMap dataset into quarters until each of these vector tiles is less than 32MB in size. An experiment by Eric Fischer

OSM Data Format

OSM data format

OSM uses a topological data structure.

Four core elements (data primitives). Nodes

Ways

Relations

Tags

Nodes

Nodes Represent points.

These are stored as a pair of latitude and longitude.

Used Waypoints as well.

Ways

These are, in general, ordered list of nodes.

Ways represent lines or polygons.

Ways can be open line string or closed loop

Relations

It is used to represent the relation among nodes and ways(i.e. its members)

Each member can have a role in the relation.

Unlike nodes and ways these don’t represent geography.

Tags

Tags represent attributes.

They are stored as pairs of keys and values.

Tags always come with node, way or a relation and not on their own

OSM Technical Issues

Not much to talk about...

So far, known issues have originated in tools and not OSM itself

A known issue is that the node identifiers exceeded the number that integer data type can hold.

References

www.openstreetmap.org

www.opencyclemap.org

http://wiki.openstreetmap.org/wiki/Using_OpenStreetMap

http://wiki.openstreetmap.org/wiki/E-OSM_Client

http://en.wikipedia.org/wiki/OpenStreetMap

http://wiki.openstreetmap.org/wiki/Servers

http://weait.com/content/build-your-own-openstreetmap-server

Thank You!Any queries?