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\documentclass{beamer}
%packages
\usepackage[latin1]{inputenc}
\usepackage{minted}
\usepackage{graphicx}
\usepackage{hyperref}
\usepackage[english]{babel}
\hypersetup{urlcolor=red,colorlinks}
\definecolor{bg}{rgb}{0.95,0.95,0.95}
\newminted{xml}{fontsize=\tiny}
\newminted{javascript}{fontsize=\tiny}
\usetheme{default}
\title[OSM-Projekt - What is...]{OSM-Projekt - An introduction into OpenStreetMap}
\author{Philipp Borgers}
\institute{Institute for Computer Science, Free University Berlin}
\date{15.4.2011}
\begin{document}
\begin{frame}
\titlepage
\end{frame}
\begin{frame}{Introduction}
\begin{itemize}
\item Huge database of geo data
\item Open Data, licenced under cc (ODbL?)
\item Everybody can contribute, it's like an wiki
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{Community}
\begin{itemize}
\item \href{http://wiki.openstreetmap.org/wiki/Develop}{Developer wikipage}
\item \href{http://lists.openstreetmap.org/listinfo}{Mailinglists (dev@lists...)}
\item \href{irc://irc.oftc.net/#osm-dev}{\#osm-dev}
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{data types - node}
\begin{itemize}
\item Id, Longitude, Latitude
\item Set of key/value pairs (tags)
\end{itemize}
\begin{xmlcode}
<node id="23" lat="51.5173639" lon="-0.140043" version="1" changeset="42" user="h4ck3r"
uid="23" visible="true" timestamp="2007-01-28T11:40:26Z">
<tag k="name" v="h4ck3rs h0m3"/>
</node>
\end{xmlcode}
\end{frame}
\begin{frame}[fragile]
\frametitle{data types - way}
\begin{itemize}
\item Id and common attributes
\item List of all node id's that make up the way
\item Last node == first node (optional, closed way)
\item A set of key/value pairs (tags)
\end{itemize}
\begin{xmlcode}
<way id="42" visible="true" timestamp="2009-01-19T19:07:25Z" version="42" changeset="2342"
user="h4ck3r" uid="23">
<nd ref="1"/>
<nd ref="2"/>
<nd ref="3"/>
<nd ref="1"/>
<tag k="oneway" v="yes"/>
</way>
\end{xmlcode}
\end{frame}
\begin{frame}[fragile]
\frametitle{data types - relation}
\begin{itemize}
\item Id and common attributes
\item A set of key/value pairs (tags)
\item An ordered list of primitives (members) with associated role attribute
\item A member consists of a type (node, way, relation), Id and a role attribute
\end{itemize}
\begin{xmlcode}
<relation id="23" timestamp="2008-12-21T19:31:43Z" user="h4ck3r" uid="42">
<member type="way" ref="2332" role="whatever"/>
<member type="node" ref="43" role="asdf"/>
<member type="relation" ref="1234" role="l33t"/>
<member type="way" ref="5678" role=""/>
<tag k="name" v="sample relation"/>
</relation>
\end{xmlcode}
\end{frame}
\begin{frame}[fragile]
\frametitle{data types - tag}
\begin{itemize}
\item A key/value pair
\item They are everywhere, you can't hide
\end{itemize}
\begin{xmlcode}
<tag k="name" v="Institut fuer Informatik"/>
\end{xmlcode}
\end{frame}
\begin{frame}[fragile]
\frametitle{data types - more on data types and elements}
\begin{itemize}
\item \href{http://wiki.openstreetmap.org/wiki/Data_Primitives}{Data primitives}
\item \href{http://wiki.openstreetmap.org/wiki/Elements}{OSM elements}
\item \href{http://wiki.openstreetmap.org/wiki/API\_v0.6}{OSM API 0.6}
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{database - schema (tables)}
\begin{itemize}
\item nodes
\item ways
\item relations
\item users
\item way\_nodes
\item relation\_members
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{database - nodes table}
\begin{tabular}{| l | c | r |}
\hline
id & bigint & not null \\ \hline
version & integer & not null \\ \hline
user\_id & integer & not null \\ \hline
tstamp & timestamp without time zone & not null \\ \hline
changeset\_id & bigint & not null \\ \hline
tags & hstore & \\ \hline
geom & geometry & \\ \hline
\end{tabular}
\end{frame}
\begin{frame}[fragile]
\frametitle{XAPI}
\begin{itemize}
\item Database frontend used to retrieve node, ways and relations
\item XPATH like requests
\item Returns xml (osm xml schema)
\item \href{http://wiki.openstreetmap.org/wiki/Xapi}{Wiki page}
\item OSM community needs a good implementation
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{XAPI - Request format}
\begin{itemize}
\item api/0.6/node[predicate]
\item api/0.6/way[-6,50,2,61]
\item api/0.6/relation[name=U3]
\item api/0.6/*[-6,50,2,61][name=U3|U4|U5]
\item api/0.6/*[name=*]
\item api/0.6/node[amenity|leisure=golf\_curse]
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{XAPI - Implementations}
\begin{itemize}
\item \href{http://xapi.openstreetmap.org/scripts/}{G.TM implementation}
\item \href{https://github.com/iandees/xapi-servlet}{Java implementation}
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{node.js}
\begin{itemize}
\item \href{http://nodejs.org/}{node.js} is asynchronous javascript
\item Event based
\item Written on top of the \href{http://code.google.com/p/v8/}{V8 Javascript Engine} (Virtual machine)
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{Simple example - echo server}
\begin{javascriptcode}
var net = require('net');
var server = net.createServer(function (socket) {
socket.write("Echo server\r\n");
socket.pipe(socket);
});
server.listen(8124, "127.0.0.1");
\end{javascriptcode}
\end{frame}
\begin{frame}[fragile]
\frametitle{Simple example - event}
Listen for events
\begin{javascriptcode}
server.on('connection', function(stream) {
console.log('someone connected!');
});
\end{javascriptcode}
Emit events
\begin{javascriptcode}
server.emit('connection',socket);
\end{javascriptcode}
\end{frame}
\begin{frame}[fragile]
\frametitle{Licence}
\begin{center}
\includegraphics[scale=0.25]{./cc.png}
\end{center}
\begin{center}
\href{http://creativecommons.org/licenses/by/3.0/}{Attribution 3.0 Unported (CC BY 3.0)}
\end{center}
\end{frame}
\begin{frame}[fragile]
\frametitle{more}
\begin{itemize}
\item \url{https://github.com/slomo/osm-spline-xapi}
\item \href{https://lists.spline.inf.fu-berlin.de/mailman/listinfo/xapi}{XAPI (course) mailinglist}
\item \url{http://osm.spline.de}
\end{itemize}
\end{frame}
\end{document}
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