Show filters Hide filters

Refine your search

Publication Year
Publisher
1-36 out of 3918 results
Change view
  • Sort by:
1:23:58 Hasso Plattner Institut (HPI) German 2012

01 Semantic Web Technologien - From Internet to Web 2.0

semantic web technologies internet web 2.0
  • Published: 2012
  • Publisher: Hasso Plattner Institut (HPI)
  • Language: German
28:59 FOSSGIS e.V. German 2014

Was gibt es Neues bei gvSIG CE?

Nach dem letzten Code Sprint (22.-25.11.2013 in Berlin) hat das Core Developer Team von gvSIG CE ein roadmap bearbeitet für die nächsten Versionen dieses Open Source Desktop GIS Projektes. In diesem Vortrag werden die neuen Funktionalitäten der Version 1.0 vorgestellt sowie der aktuelle Stand des Projektes. Bei der Entwicklung von gvSIG CE wird darauf Wert gelegt, die bestmögliche Integration anderer Open Source Software zu gewährleisten. GDAL, proj4, SEXTANTE, GRASS GIS, OpenCADTools und NavTable sind einige Beispiele. Ab dem Code Sprint von 2012 in München wurde das gvtool Projekt gestartet, mit dem man die Integration von geotools weiter entwickeln wird. gvSIG CE 1.0 wird GDAL 1.10 benutzen, um Raster Daten lesen zu können u.a. auch die Formate ECW, JP2 y MrSID. Bei dieser Entwicklung wurden die offiziellen bindings von gvSIG ersetzt durch die von GDAL. Die java Version von SEXTANTE wird hauptsächlich vom gvSIG CE Team weiter entwickelt. Im März 2013 hat unser Team eine neue Version von SEXTANTE ins Leben gerufen mit einer effizienteren Anbindung an GRASS GIS. Die Erweiterung ExtCad, die in der offiziellen Version von gvSIG benutzt wird, wurde durch eine aktuelle und verbesserte Version des Open Source Projektes OpenCadTools ersetzt. Zusammen mit den Entwicklern von OpenCadTools wurde eine bessere Version ins Leben gerufen, mit der sich die Editiermöglichkeiten von gvSIG CE deutlich verbessern. Das gvSIG CE Team hat verschiedene Maßnahmen durchgeführt mit dem Ziel, die Pflege und den weiteren Aufbau der Software einfacher zu machen. Diese Änderungen sowie die neuen Funktionen, die entwickelt worden sind, würden wir gerne bei der kommenden FOSSGIS Konferenz vorstellen.
  • Published: 2014
  • Publisher: FOSSGIS e.V.
  • Language: German
24:20 FOSSGIS e.V. German 2014

Neues vom Open Geospatial Consortium

Die Standards des OGC sind aus den meisten Geodateninfrastrukturen, Geoportalen und WebGIS-Lösungen nicht wegzudenken. Viele Ausschreibungen setzen den Einsatz von OGC Standards voraus und Richtlinien wie die INSPIRE Direktive basieren auf ISO und OGC Standards. Wie in den Jahren davor, werden in diesem Vortrag Neuigkeiten aus dem OGC vorgestellt und Fragen aus dem Publikum beantwortet. Nach einer kurzen Einführung, in der unter anderem das Memorandum of Understanding zwischen der OSGeo und dem OGC dargestellt wird, wird das OGC Compliance Programm (Software Zertifizierung) näher erläutert und die Rolle von Open Source Software und der OSGeo Community. Abschließend wird erklärt, was sich hinter dem Ideas4OGC Prozess verbirgt und ein Ausblick auf das OGC Technical Committee Meeting im März 2014 gegeben.
  • Published: 2014
  • Publisher: FOSSGIS e.V.
  • Language: German
41:47 Open Science Training Initiative (OSTI) English 2013

3. Data, Code & Content Licensing

The following video is an original recording from the OSTI pilot initiative. Entitled "Data, Code & Content Licensing", the seminar introduces the theme of licensing, outlines the advantages of this approach, and takes students through the main steps of implementation.
  • Published: 2013
  • Publisher: Open Science Training Initiative (OSTI)
  • Language: English
23:50 FOSSGIS e.V. German 2015

MapFish Print V3: Printing maps like a boss

Dieser Vortrag stellt die neue Version von MapFish Print vor und spricht Themen an wie die neuen Features und deren Nutzung, die Erstellung von Templates mit dem Report-Designer von JasperReports, Upgrade von der vorherigen Version, Skalierbarkeit und Erweiterung durch eigene Module. Das Projekt MapFish Print besteht aus einer Bibliothek und einer Web-Anwendung zum Druck von Reports mit Karten, wobei eine Vielfalt von Quellen unterstützt wird, zum Beispiel WMS, WMTS, OpenStreetMap-Kacheln, WFS oder GeoJSON. Mittlerweile besteht das Projekt seit fast einem Jahrzehnt und wird in einer Vielzahl von Websites erfolgreich eingesetzt. Allerdings ist es etwas in die Jahre gekommen, so dass die ursprüngliche Architektur zum Hindernis wurde. Beispielsweise ist die Formatierung der Reports über eine Konfigurationsdatei nicht sehr flexibel, das Ausgabeformat ist prinzipiell auf PDF beschränkt, es ist nicht möglich mehr als eine Karte auf einer Seite anzuzeigen und andere Limitationen. MapFish Print V3 ist das Ergebnis eines kompletten Rewrites der Implementierung. Dank der Integration mit der weit verbreiteten Reporting-Engine JasperReports und der neuen, erweiterbaren Architektur ist MapFish Print flexibler, mächtiger und einfacher zu Skalieren als je zuvor. Diese Präsentation richtet sich an Web-Entwickler und Projektleiter, und spricht folgende Themen an: * Die neuen Features der neuen Version * Wie können diese Features genutzt werden? * Die Verwendung des Report-Designers * Beispiele für komplexe Reports * Upgrade von der vorherigen Version * Die Architektur, wie sie die Skalierbarkeit erleichtert und wie sie es ermöglicht MapFish Print durch eigene Module zu erweitern
  • Published: 2015
  • Publisher: FOSSGIS e.V.
  • Language: German
21:55 FOSSGIS e.V. German 2015

Projekt Umweltzone

In diesem Vortrag wird das Projekt "Umweltzone" vorgestellt. Dabei handelt es sich um eine kostenlose Open-Source-Anwendung für Android-Geräte, mit der sich Benutzer über die Lage der Umweltzonen verschiedener deutscher Städte informieren können. Die Herausforderung bestand in der Recherche, Beschaffung, Digitalisierung bzw. Umwandlung und Integration der Geoinformation zu den Umweltzonen. Das Projekt "Umweltzone" startete im Oktober 2013 als direkte Reaktion auf das Fehlen eines zeitgemäßen Informationsangebots für mobile Geräte. Zu diesem Zeitpunkt boten deutsche Städte Informationen zu ihren Umweltzonen lediglich in Form schlecht auflösender Bilder, als PDFs mit eingescannten Stadtplänen oder in Geoportalen an. Eine Anwendung für Android-Geräte, die den mobilen Nutzer ansprach, war nicht vorhanden. Diese Lücke sollte die "Umweltzone"-Anwendung schliessen. Der Vortrag dokumentiert, dass schnell klar wurde, dass die eigentliche Programmierung der Anwendung nicht die größte Hürde darstellte. Die Herausforderung bestand in der Recherche, Beschaffung, Digitalisierung bzw. Umwandlung und Integration der Geoinformation zu den Umweltzonen. Die ersten Tage des Projekts waren von Euphorie geprägt: einige Umweltzonen wurden manuell abgezeichnet, um die Geokoordinaten von einem Bild in digitale Verlaufspunkte zu übertragen. Bald darauf versuchte das Projekt mit Open-Data-Anfragen, Daten in den Behörden deutscher Städte zu befreien. Über die Resultate dieser Bemühungen wird in diesem Vortrag berichtet. Nach der Veröffentlichung der ersten Version der Anwendung kam eine neue Datenquelle hinzu: OpenStreetMap. Das Verzeichnis freier Geodaten offenbarte sich als vielversprechende Alternative zu den offiziellen Publikationen deutscher Städte. Der Vortrag berichtet über die Herausforderungen bei der Datenextraktion, Umwandlung und Prüfung. Zudem soll der Zwiespalt zwischen per Crowdsourcing gesammelten Daten und Veröffentlichungen von Behörden diskutiert werden. Weiterhin berichtet der Vortrag über den Verlauf und Erfolg der "Umweltzonen"-Wochenaufgabe im August 2014 in der deutschen OpenStreetMap-Nutzergemeinde. Es werden die Ergebnisse des Hack Weekends zur Umweltzone vorgestellt. Nicht zuletzt sollen die zukünftigen Schritte des Projekts dargestellt werden.
  • Published: 2015
  • Publisher: FOSSGIS e.V.
  • Language: German
55:49 Vanschoren, Joaquin English 2014

Meta-Learning on QSAR data

Can we learn how to design drugs? Topics include: Automating drug discovery with the Robot Scientist. Using chemoinformatic databases and in-house datasets to systematically run extensive comparative QSAR experiments. Learning how to better apply existing QSAR methods. Decreasing the time and cost to develop new drugs. Prof. Dr. Ross D. King is Professor of Machine Intelligence in the School of Computer Science at the University of Manchester. King's research interests are in the automation of science, drug design, AI, machine learning and synthetic biology. He is probably best known for the Robot Scientist.
  • Published: 2014
  • Publisher: Vanschoren, Joaquin
  • Language: English
1:13:36 Hasso Plattner Institut (HPI) German 2009

Resource Description Framework - RDF

  • Published: 2009
  • Publisher: Hasso Plattner Institut (HPI)
  • Language: German
57:26 Hasso Plattner Institut (HPI) German 2009

Einführung (Teil 2) / Vom WWW zum Semantic Web

  • Published: 2009
  • Publisher: Hasso Plattner Institut (HPI)
  • Language: German
51:59 Hasso Plattner Institut (HPI) German 2009

XML und XML-Schema (Teil 2)

  • Published: 2009
  • Publisher: Hasso Plattner Institut (HPI)
  • Language: German
1:27:29 Hasso Plattner Institut (HPI) German 2012

13 Semantic Web Technologien - Semantic Search

  • Published: 2012
  • Publisher: Hasso Plattner Institut (HPI)
  • Language: German
1:19:37 Hasso Plattner Institut (HPI) German 2011

01 Semantic Web Technologien - Einführung

  • Published: 2011
  • Publisher: Hasso Plattner Institut (HPI)
  • Language: German
1:23:14 Hasso Plattner Institut (HPI) German 2011

02 Semantic Web Technologien - URI und RDF

  • Published: 2011
  • Publisher: Hasso Plattner Institut (HPI)
  • Language: German
1:00:51 Hasso Plattner Institut (HPI) German 2011

03 Semantic Web Technologien - RDFS, RDFa und SPARQL

  • Published: 2011
  • Publisher: Hasso Plattner Institut (HPI)
  • Language: German
26:21 Technische Informationsbibliothek (TIB) English 2013

Bringing crystal structures to life in the scientific literature

Crystallographic research frequently involves determination of three-dimensional crystal lattices or molecular structures by diffraction techniques. The adoption of a standard computer-interpretable data description by the International Union of Crystallography (IUCr) has allowed the development of new workflows for its scientific journals. These result in a tight integration of scientific articles with the actual data and metadata that underpin the results that they discuss. Data validation is an integral (and largely automatic) part of the peer review procedure for IUCr journals; the structural models can be visualised directly while reading the published article, and can be used as the basis for interactive database searches and queries. The journals also link and transfer data to curated domain-wide structural databases such as the Protein Data Bank, Cambridge Structural Database and Inorganic Crystal Structure Database. For short structural articles, the actual data files, annotated with the text of the discussion, actually form the submission medium, and tools have been created to allow easy authoring and the creation of interactive molecular graphics.
  • Published: 2013
  • Publisher: Technische Informationsbibliothek (TIB)
  • Language: English
34:24 Technische Informationsbibliothek (TIB) English 2013

The CNRS engagement in research infrastructures for digital humanities

The French CNRS (National Center for Scientific Research) is involved in almost all scientific fields, including Humanities and Social Sciences (HSS). Within the HSS, transition to digital humanities has been on the CNRS agenda for more than 10 years, leading in particular the creation of so-called very large-scale research infrastructures (TGIR). The presentation will provide a closer look at two of these TGIRs, TGE Adonis and CORPUS-IR, at related developments and the ways in which non-textual information is handled in these facilities. The goal of Adonis is to provide three types of services to the HSS communities: preservation, processing and dissemination of digital objects produced by the research labs. Adonis is working closely with CINES, center for long-term preservation in French higher education and research, and has a role of coordination of the Centers of digital resources, which have been created by CNRS since 2005. A special focus will be on the ISIDORE platform, a unique access point to various kinds of resources, using state-of-the-art data linking and enrichment techniques. It will finally be mentioned how non-textual information is also finding its way into the HAL central open archive run by CNRS.
  • Published: 2013
  • Publisher: Technische Informationsbibliothek (TIB)
  • Language: English
1:27:23 Hasso Plattner Institut (HPI) German 2012

03 Semantic Web Technologien - RDFS and RDFa

  • Published: 2012
  • Publisher: Hasso Plattner Institut (HPI)
  • Language: German
14:25 Moving Pictures, US Army Construction Engineering Research Laboratory English 1987

GRASS

Video presentation explaining the features and capabilities of this computer-based mapping system.
  • Published: 1987
  • Publisher: Moving Pictures, US Army Construction Engineering Research Laboratory
  • Language: English
1:22:17 Stiftung Universität Hildesheim English 2015

Retrieval in the Web II

This lecture gives an overview on Information Retrieval. It explains why documents are ranked the way they are. The lecture explains the most relevant ways for content representation: Automatic indexing and manual indexing. For automatic indexing, the frequencey of word is of special relevance and their influence on the weighting of term are discussed. The most relevant models are introduced. The session on evaluation discusses new metrics like the Normalized Discounted Cumulative Gain. The session of information behavior provides a brief overview and explains the relation to IR. The session on optimization mainly introduces term expansion and fusion methods. The session on Web retrieval is concerned with the quality aspects and gives a basic insight to the PageRank algorithm.
  • Published: 2015
  • Publisher: Stiftung Universität Hildesheim
  • Language: English
41:15 Vanschoren, Joaquin English 2014

OpenML, R, mlr

I will first introduce an R package to interface with OpenML. We support querying and downloading, running experiments and uploading results, so that all your experiments are organized online. R itself allows many forms of machine learning methods and experiments, from completely custom code to powerful semi-automated frameworks. The OpenML package is framework-agnostic in that regard. The mlr package provides a generic, object-oriented, and extensible interface to a large number of machine learning methods in R. It enables researchers and practitioners to easily compare methods and implementations from different packages, rapidly conduct complex experiments, and implement their own meta-methods using mlr's building blocks. Classification, regression, survival analysis, and clustering are supported and virtually every resampling strategy. Meta-Optimization can be performed by tuning, feature filtering and feature selection, and most modeling steps can be parallelized. Its object-oriented structure provides in many cases a close match to the OpenML structure, and it can already be connected to the OpenML R package in a simple manner. The talk will conclude with an outlook regarding the next steps, open challenges and ideas to improve upon the current state of the project.
  • Published: 2014
  • Publisher: Vanschoren, Joaquin
  • Language: English
46:58 Vanschoren, Joaquin English 2014

Estimating the Performance of Predictive Models in R

This talk will start with a very brief introduction to R and the main concepts of this data analysis environment and programming language. We will then shift focus to predictive tasks and models obtained from data to solve these tasks. Finally, the main topic of the talk will be on how to solve the critical issue of estimating the predictive performance of alternative models to solve some task. This estimation process is key to answer the question of which model is the "best" for a problem we are facing. We will describe the facilities provided by the R package performanceEstimation to address this model selection problem and provide some illustrative case studies. We wrap up with the ongoing plans of interfacing this package to OpenML.
  • Published: 2014
  • Publisher: Vanschoren, Joaquin
  • Language: English
22:43 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2013

Using Spatial Business Intelligence For Asset Management

The maintenance of waterways is expensive. Optimization of reconstruction projects can save money and limit hindrance for the public. In this presentation I show how the implementation of Spatial OLAP can give better insight in the quality of the construction of waterway banks. By spatially overlaying inspection results with construction records, a better estimation can be made about the overall quality, potential danger and repair costs. Spatial OLAP is an excellent way to provide insight into the different variables involved in the planning proces of maintenance.
  • Published: 2013
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
24:39 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2013

TileServer: Hosting Map Tiles And MBTiles

OpenGIS Web Map Tiling Service (WMTS) is becoming the standard used for distributing raster maps to the web and mobile applications, cell-phones, tablets as well as desktop software. Practically all popular desktop GIS products now support this standard as well, including ESRI ArcGIS for Desktop, open-source Quantum GIS (qgis) and uDig, etc. The TileServer, a new open-source software project, is going to be demonstrated. It is able to serve maps from an ordinary web-hosting and provide an efficient OGC WMTS compliant map tile service for maps pre-rendered with MapTiler, MapTiler Cluster, GDAL2Tiles, TileMill or available in MBTiles format. The presentation will demonstrate compatibility with ArcGIS client and other desktop GIS software, with popular web APIs (such as Google Maps, MapBox, OpenLayers, Leaflet) and with mobile SDKs. We will show a complete workflow from a GeoTIFF file (Ordnance Survey OpenData) with custom spatial reference coordinate system (OSGB / EPSG:27700) to the online service (OGC WMTS) provided from an ordinary web-hosting. The software has been originally developed by Klokan Technologies GmbH (Switzerland) in cooperation with NOAA (The National Oceanic and Atmospheric Administration, USA) and it has been successfully used to expose detailed aerial photos during disaster relief actions, for example on the crisis response for Hurricane Sandy and Hurricane Isaac in 2012. The software was able to handle large demand from an ordinary in-house web server without any issues. The geodata were displayed in a web application for general public and provided to GIS clients for professional use - thanks to compatibility with ArcIMS. It can be easily used for serving base maps, aerial photos or any other raster geodata. It very easy to apply - just copy the project files to a PHP-enabled directory along with your map data containing metadata.json file. The online service can be easily protected with password or burned-in watermarks made during the geodata rendering. Tiles are served directly by Apache web server with mod rewrite rules as static files and therefore are very fast and with correct HTTP caching headers. The web interface and XML metadata are delivered via PHP, because it allows deployment on large number of existing web servers including variety of free web hosting providers. There is no need to install any additional software on the webserver. The mapping data can be easily served in the standardized form from in-house web servers, or from practically any standard web-hosting provider (the cheap unlimited tariffs are applicable too), and from a private cloud. The same principle can be applied on an external content distribution network (Amazon S3 / CloudFront) to serve the geodata with higher speed and reliability by automatically caching it geographically closer to your online visitors, while still paying only a few cents per transferred gigabyte.
  • Published: 2013
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
19:46 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2013

Using OSGeo Live In MSc Teaching

Big Data in the Earth sciences, the Tera- to Exabyte archives, mostly are made up from coverage data whereby the term "coverage", according to ISO and OGC, is defined as the digital representation of some space-time varying phenomenon. Common examples include 1-D sensor timeseries, 2-D remote sensing imagery, 3D x/y/t image timeseries and x/y/z geology data, and 4-D x/y/z/t atmosphere and ocean data. Analytics on such data requires on-demand processing of sometimes significant complexity, such as getting the Fourier transform of satellite images. As network bandwidth limits prohibit transfer of such Big Data it is indispensable to devise protocols allowing clients to task flexible and fast processing on the server. The EarthServer initiative, funded by EU FP7 eInfrastructures, unites 11 partners from computer and earth sciences to establish Big Earth Data Analytics. One key ingredient is flexibility for users to ask what they want, not impeded and complicated by system internals. The EarthServer answer to this is to use high-level query languages; these have proven tremendously successful on tabular and XML data, and we extend them with a central geo data structure, multi-dimensional arrays. A second key ingredient is scalability. Without any doubt, scalability ultimately can only be achieved through parallelization. In the past, parallelizing code has been done at compile time and usually with manual intervention. The EarthServer approach is to perform a semantic-based dynamic distribution of queries fragments based on networks optimization and further criteria. The EarthServer platform is comprised by rasdaman, an Array DBMS enabling efficient storage and retrieval of any-size, any-type multi-dimensional raster data. In the project, rasdaman is being extended with several functionality and scalability features, including: support for irregular grids and general meshes; in-situ retrieval (evaluation of database queries on existing archive structures, avoiding data import and, hence, duplication); the aforementioned distributed query processing. Additionally, Web clients for multi-dimensional data visualization are being established. Client/server interfaces are strictly based on OGC and W3C standards, in particular the Web Coverage Processing Service (WCPS) which defines a high-level raster query language. We present the EarthServer project with its vision and approaches, relate it to the current state of standardization, and demonstrate it by way of large-scale data centers and their services using rasdaman.
  • Published: 2013
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
1:24:21 Stiftung Universität Hildesheim English 2015

Representation I: Manual Indexing

This lecture gives an overview on Information Retrieval. It explains why documents are ranked the way they are. The lecture explains the most relevant ways for content representation: Automatic indexing and manual indexing. For automatic indexing, the frequencey of word is of special relevance and their influence on the weighting of term are discussed. The most relevant models are introduced. The session on evaluation discusses new metrics like the Normalized Discounted Cumulative Gain. The session of information behavior provides a brief overview and explains the relation to IR. The session on optimization mainly introduces term expansion and fusion methods. The session on Web retrieval is concerned with the quality aspects and gives a basic insight to the PageRank algorithm.
  • Published: 2015
  • Publisher: Stiftung Universität Hildesheim
  • Language: English
1:21:45 Stiftung Universität Hildesheim English 2015

Retrieval in the Web I

This lecture gives an overview on Information Retrieval. It explains why documents are ranked the way they are. The lecture explains the most relevant ways for content representation: Automatic indexing and manual indexing. For automatic indexing, the frequencey of word is of special relevance and their influence on the weighting of term are discussed. The most relevant models are introduced. The session on evaluation discusses new metrics like the Normalized Discounted Cumulative Gain. The session of information behavior provides a brief overview and explains the relation to IR. The session on optimization mainly introduces term expansion and fusion methods. The session on Web retrieval is concerned with the quality aspects and gives a basic insight to the PageRank algorithm.
  • Published: 2015
  • Publisher: Stiftung Universität Hildesheim
  • Language: English
59:57 Stiftung Universität Hildesheim English 2015

Optimization

This lecture gives an overview on Information Retrieval. It explains why documents are ranked the way they are. The lecture explains the most relevant ways for content representation: Automatic indexing and manual indexing. For automatic indexing, the frequencey of word is of special relevance and their influence on the weighting of term are discussed. The most relevant models are introduced. The session on evaluation discusses new metrics like the Normalized Discounted Cumulative Gain. The session of information behavior provides a brief overview and explains the relation to IR. The session on optimization mainly introduces term expansion and fusion methods. The session on Web retrieval is concerned with the quality aspects and gives a basic insight to the PageRank algorithm.
  • Published: 2015
  • Publisher: Stiftung Universität Hildesheim
  • Language: English
1:18:34 Stiftung Universität Hildesheim English 2015

Representation II: Automatic Indexing

This lecture gives an overview on Information Retrieval. It explains why documents are ranked the way they are. The lecture explains the most relevant ways for content representation: Automatic indexing and manual indexing. For automatic indexing, the frequencey of word is of special relevance and their influence on the weighting of term are discussed. The most relevant models are introduced. The session on evaluation discusses new metrics like the Normalized Discounted Cumulative Gain. The session of information behavior provides a brief overview and explains the relation to IR. The session on optimization mainly introduces term expansion and fusion methods. The session on Web retrieval is concerned with the quality aspects and gives a basic insight to the PageRank algorithm.
  • Published: 2015
  • Publisher: Stiftung Universität Hildesheim
  • Language: English
1:19:08 Stiftung Universität Hildesheim English 2015

Information Behavior

This lecture gives an overview on Information Retrieval. It explains why documents are ranked the way they are. The lecture explains the most relevant ways for content representation: Automatic indexing and manual indexing. For automatic indexing, the frequencey of word is of special relevance and their influence on the weighting of term are discussed. The most relevant models are introduced. The session on evaluation discusses new metrics like the Normalized Discounted Cumulative Gain. The session of information behavior provides a brief overview and explains the relation to IR. The session on optimization mainly introduces term expansion and fusion methods. The session on Web retrieval is concerned with the quality aspects and gives a basic insight to the PageRank algorithm.
  • Published: 2015
  • Publisher: Stiftung Universität Hildesheim
  • Language: English
1:04:15 Stiftung Universität Hildesheim English 2015

Models I

This lecture gives an overview on Information Retrieval. It explains why documents are ranked the way they are. The lecture explains the most relevant ways for content representation: Automatic indexing and manual indexing. For automatic indexing, the frequencey of word is of special relevance and their influence on the weighting of term are discussed. The most relevant models are introduced. The session on evaluation discusses new metrics like the Normalized Discounted Cumulative Gain. The session of information behavior provides a brief overview and explains the relation to IR. The session on optimization mainly introduces term expansion and fusion methods. The session on Web retrieval is concerned with the quality aspects and gives a basic insight to the PageRank algorithm.
  • Published: 2015
  • Publisher: Stiftung Universität Hildesheim
  • Language: English
1:06:00 Stiftung Universität Hildesheim English 2015

Evaluation

This lecture gives an overview on Information Retrieval. It explains why documents are ranked the way they are. The lecture explains the most relevant ways for content representation: Automatic indexing and manual indexing. For automatic indexing, the frequencey of word is of special relevance and their influence on the weighting of term are discussed. The most relevant models are introduced. The session on evaluation discusses new metrics like the Normalized Discounted Cumulative Gain. The session of information behavior provides a brief overview and explains the relation to IR. The session on optimization mainly introduces term expansion and fusion methods. The session on Web retrieval is concerned with the quality aspects and gives a basic insight to the PageRank algorithm.
  • Published: 2015
  • Publisher: Stiftung Universität Hildesheim
  • Language: English
39:45 FOSSGIS e.V. German 2012

OSM Quiz 2012

  • Published: 2012
  • Publisher: FOSSGIS e.V.
  • Language: German
25:37 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2013

Disconnected Geospatial Mobile & Open Source 5 Rules To Success?

We present the challenges of building a disconnected geospatial mobile solution and devise five simple rules for the success of your app. This paper will look at the following key issues: Rule 1 Data Storage. Streaming GI data requires good bandwidth, by implementing a caching mechanism the end-user will always have access to the data for a given area. Rule 2 - Use Open Source. Free and Open Source software for GIS has evolved significantly in recent years and in some cases faster than commercial alternatives. The mobile field is a bit different and few experts are using free and open source mobile GIS, despite the good tools that exist. Rule 3 - Use Open Standards. In combination with the use of Open Source products, Open Standards can help future proof the solution. Rule 4 - Simplify User Interfaces. The time of the stylus is gone and users now expect to use their finger for driving the application. Specific attention must be paid to designing simple and clear user interfaces. Rule 5 - Implement Non native Solutions. Should separate solutions be developed for IPhone and Android? Could the answer be instead to actually develop non native solutions reducing development and maintenance costs. Armed with these rules we will look at the challenges on the road ahead to implementing your GI Mobile solution.
  • Published: 2013
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
23:58 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2013

Cartaro - The Geospatial CMS

Cartaro is a new web mapping platform that makes the power of some of the best open source geospatial components available in a content management system (CMS). Cartaro allows to set-up and run small websites or complex web applications with maps and geodata. It is also suitable for geoportals and spatial data infrastructures whenever there is the need to get everything up and running without much individual programming. The geospatial software stack used in Cartaro consists of PostGIS, GeoServer, GeoWebCache and OpenLayers. The whole stack is managed from within the CMS Drupal. The geospatial components bring professional aspects of geodata management into the CMS. This is namely the ability to persist data as true geometries, thus allowing for complex and fast queries and analyses. It does also mean supporting a whole range of data formats and the most relevant OGC standards. For the latter Cartaro can extend the handling of user roles and permissions, which already exists in Drupal, to define fully granular read and write permissions for the web services, too. In the presentation we will first explain our basic motivation behind Cartaro: that is bringing geospatial functionality to the huge community of CMS developers and users. This community, which is of course much larger than the classical FOSS4G community, has a great potential to make more and better use of geodata than it was possible with most existing tools. We will then demonstrate how far the integration with the CMS reaches and present the Drupal user interface that allows to configure most features of Cartaro. We will show how to create, edit and map geospatial content with Cartaro and we will demonstrate the publication of this content as an OGC web service. We will also go into some details concerning the architecture of Cartaro and explain how we tackled specific problems. A glimpse of the some use cases will demonstrate the real potential of Cartaro. It will also show how the focus and functionality of a Cartaro based application can be extended with the installation of any of the Drupal modules that exist for almost every task one could imagine. The presentation will close with the future perspectives for Cartaro. From a technical point of view this includes the roadmap for the next months. But it also includes a discussion of our ideas about Cartaro's role as self-supporting bridge between the geo and not-so-geo world of open source software.
  • Published: 2013
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
26:23 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2013

Leaflet: Past, Present, Future

Leaflet, a JavaScript library for mobile-friendly interactive maps, has come a long way since its inception. The library started as a one-night hack and evolved over the next two years as a closed proprietary API, developed by one person, and then was finally rewritten from scratch as an open source library in 2011. Leaflet is now the most popular open source solution for publishing maps on the Web. What’s the story behind Leaflet? How did it became so successful so quickly despite strong competition and lack of features? This talk will be presented by its lead developer and will cover lessons learned, the current state of the project and future challenges.
  • Published: 2013
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
16:26 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2013

Gestural Interaction With Spatiotemporal Linked Open Data

Exploring complex spatiotemporal data can be very challenging for non-experts. Recently, gestural interaction has emerged as a promising option, which has been successfully applied to various domains, including simple map control. In this paper, we investigate whether gestures can be used to enable non-experts to explore and understand complex spatiotemporal phenomena. In this case study we made use of large amounts of Linked Open Data about the deforestation of the Brazilian Amazon Rainforest and related ecological, economical and social factors. The results of our study indicate that people of all ages can easily learn gestures and successfully use them to explore the visualized and aggregated spatiotemporal data about the Brazilian Amazon Rainforest.
  • Published: 2013
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
out of 109 pages
Loading...
Feedback

Timings

  259 ms - page object
  195 ms - search
    9 ms - highlighting
    1 ms - highlighting/15590
    1 ms - highlighting/15524
    7 ms - highlighting/14272
    2 ms - highlighting/16264
    3 ms - highlighting/16262
    4 ms - highlighting/16259
    2 ms - highlighting/15587
    4 ms - highlighting/16267
    5 ms - highlighting/16278
    4 ms - highlighting/16279
    2 ms - highlighting/15591
    2 ms - highlighting/17616
    3 ms - highlighting/16265
    4 ms - highlighting/16266
    3 ms - highlighting/14833
    2 ms - highlighting/10413
    9 ms - highlighting/11269
    4 ms - highlighting/16258
    3 ms - highlighting/10405
    2 ms - highlighting/17617
    3 ms - highlighting/15903
    3 ms - highlighting/14748
    2 ms - highlighting/14932
    4 ms - highlighting/16256
    1 ms - highlighting/12963
    7 ms - highlighting/14282
    6 ms - highlighting/14285
    2 ms - highlighting/16277
    6 ms - highlighting/11265
    6 ms - highlighting/14262
    5 ms - highlighting/14266
    6 ms - highlighting/14270
    6 ms - highlighting/11268
    1 ms - highlighting/15548
    2 ms - highlighting/15517
    2 ms - highlighting/15538

Version

AV-Portal 3.8.0 (dec2fe8b0ce2e718d55d6f23ab68f0b2424a1f3f)