Paper Abstract (short)
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An introduction to the new spatio-temporal capabilities of GRASS GIS that transform it into a comprehensive temporal GIS.
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Paper Abstract (long)
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Recently GRASS GIS has been extended to provide spatio-temporal modeling, processing, analysis and visualization capabilities based on the field based view of geographic data. Space time datasets were introduced to represent collections of time stamped raster, 3D raster and vector maps. A comprehensive set of new spatio-temporal modules were introduced that make the management, processing and visualization of massive time series data as easy as possible. The integrated temporal topology approach allows the investigation of temporal and spatial relationships between different space time datasets. New interfaces to spatio-temporal analysis and processing software as R, ParaView and CDO were implemented for seamless data exchange. These new capabilities transform GRASS into a comprehensive temporal GIS.
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Topic type
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Target Type
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Development: new developments in products.
New data: handling new data models, for example 3D & temporal data, or big data.
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End User
Technical / Developer
Modeler of spatio-temporal data, GIS developer
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Name
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Andy South
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Organisation
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Freelance
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Email
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southandy@gmail.com
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Paper Title
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Half a million petition signatures mapped for free using open-source, open-data and an open-api.
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I can give a practical demo
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yes
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Paper Abstract (short)
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I will present the workflow used to download and visualise the temporal and spatial uptake of one of the largest and fastest online petitions the UK has ever seen.
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Paper Abstract (long)
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This talk will present a case study of visualising the uptake of an online petition on the social activism site change.org. I will outline the workflow of what was done to download and visualise data for half a million signatures. I used exclusively free and open-source tools and data. I used the statistical environment R as my main workhorse. An R script was used to access the change.org open API and download the signature data in the maximum permitted blocks of 500 hundred signatures. To date (the petition is still running at this time) over 800 requests have been made. The data are returned as JSON and were then read into R. The process occasionally fails when users have accidentally typed a character that acts as a JSON escape code. I developed code to correct these files. R was used to bind the data into a single file. The petition asks for town of residence. I used the freely available GB public transport gazetteer from data.gov.uk to geocode the data by merging latitude longitude columns onto the signature data. To include Northern Ireland in the analysis I downloaded a second gazetteer and repeated the process. I then used R to reproject the Northern Irish coordinates from the Irish grid to the OS GB grid so that they could be displayed on the same map. The data was initially used to plot a timeline of cumulative uptake and a bubble plot indicating the spatial distribution of signatures. The map and timeline were sent to over half a million people via email and twitter. To allow more detailed interrogation of the data I used the R package shiny to create a javascript web application. Each step in this process will be covered and the presentation will contain the code allowing the audience to replicate the steps.
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Topic type
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Target Type
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Case Studies: Relate your experiences.
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People new to open source geospatial
Technical / Developer
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Additional Presenters
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Name
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Andy South
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Organisation
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Freelance
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Email
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southandy@gmail.com
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Name
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AndrŽs Maneiro
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Organisation
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iCarto
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Email
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amaneiro@icarto.es
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Paper Title
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How linear referencing and dynamic segmentation can help us to model (linear) assets: a custom application for a road network.
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I can give a practical demo
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yes
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Paper Abstract (short)
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This session will look into how advanced data modeling methods -linear referencing and dynamic segmentation- can be useful in working with assets such as roads, water and sanitation networks, rivers or electrical grids. We will also showcase a custom solution based on PostGIS and gvSIG for road networks -built upon the methods mentioned- which is used in a european regional administration, located in Lugo, Galicia, northwest of Spain.
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Paper Abstract (long)
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This session will look into how advanced data modeling methods -linear referencing and dynamic segmentation- can be useful in working with assets such as roads, water and sanitation networks, rivers or electrical grids. We will also showcase a custom solution based on PostGIS and gvSIG for road networks -built upon the methods mentioned- which is used in a european regional administration, located in Lugo, Galicia, northwest of Spain. In making an inventory of assets, we may have some basic entities -for example: a road- over the which we need to store more information -attributes or features- as its width, type of surface, elevation, traffic accidents, etc. In such a case, different approaches may be used to model this kind of data. For example: storing all the necessary attributes (width, surface, etc) in the same entity and split it at a constant rate -for instance: every few meters- or at a variable one -every time any of its features changes. Other solution might be to create several entities, one for each feature or event of the road, and update them separately. Last, but not the least, we can also consider using linear referencing and dynamic segmentation, which allow us to store every feature as a separate entity while having only one reference geometry (the road) over the wich all the attributes are referenced. Each method above can be useful in different situations: for example, when gathering information with mechanical means -such as a car- it is very common to receive the data at segments of the same length. But also some techniques are not recommended in some contexts on account of the problems they may cause: data fragmentation due to excesive segmentation (an important source of performance degradation and storage wasting), making the updating tasks harder for technicians since each one of the entities should change when the basic entity is modified, etc. The second part of the session will walk through a specific solution built on linear referencing and dynamic segmentation techniques, which helped us to design a system where each feature changed at different rate -avoiding the fragmentation phenomenon- while allowing for easy growth and extensibility of the data model and making the updating tasks easier for users. The application is a custom product for road management used in the conservation department of a regional european administration (located in Lugo, Galicia, northwest of Spain) built on top of PostGIS LRS functions and gvSIG as the UI tool to interact with the data. We will showcase how an user can view and update the data through the features catalog; how a technician can change the basic entity (the road) and that automatically will force the features and events affected to update; and other real use cases for this application and the opportunities that these techniques open. - About the speaker AndrŽs is a lead software architect and partner at iCarto, a company specialized in building custom solutions in areas such as civil engineering, development aid and cultural heritage. During last 5 years he has built products based on PostgreSQL, PostGIS, gvSIG, Geoserver, Openlayers, Python Pyramid or Backbone and he is fluent in languages such as Java, Javascript, Python, SQL and HTML5/CSS3.
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Topic type
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Target Type
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Case Studies: Relate your experiences.
Hacks and Mashes: novel solutions to our problems.
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Manager
End User
Technical / Developer
Although focused on manages/end users, it may be interesting for devs due to the techniques used.
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Name
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Roger Bamkin
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Organisation
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Victuallers
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Email
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roger@bamkin.org.uk
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Paper Title
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How to create a geocoded town - Monmouthpedia and Gibraltarpedia
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I can give a practical demo
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yes
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Paper Abstract (short)
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Monmouthpedia and Gibraltarpedia are towns that have hundreds of geocoded Wikipedia articles. The authors have liased with communities, businesses, universities, PHd students, media to create these places in augmented reality and it in the real world
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Paper Abstract (long)
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Monmouthpedia was the first Wikipedia project to embrace a whole townÑspecifically, the Welsh town of Monmouth (pron.: /_m_nm__/ MON-m_th; Welsh: Trefynwy). The project aimed to cover every single notable place, person, artefact, plant, animal and other things in Monmouth in as many languages as possible, but with a special focus on Welsh. This was a different scale of wikipedia-project. The project was jointly funded by Monmouthshire County Council and Wikimedia UK, Monmouthshire County Council and it included free town wide Wi-Fi for the project. Ó Monmouthpedia uses QRpedia codes, a type of bar code a smartphone can read through its camera (using one of the many free QR readers available) that takes you to a Wikipedia article in your language. QR codes are extremely useful, as physical signs have no way of displaying the same amount of information and in a potentially huge number of languages. Articles have coordinates (geotags) to allow a virtual tour of the town using Wikipedia's mobile apps (or the Wikipedia layer on Google Streetview) and are available in augmented reality software including Layar. Monmouthpedia may not use standard black and white QR codes, in order to differentiate between MonmouthpediA codes and other schemes and individual's codes. There are different kinds of QR codeÑplaques and labelsÑall put up with the permission of the council and building owner: GibraltarpediA is the first Wikipedia project to aspiresto bridge two continents. Like Monmouthpedia the project aims to cover every single notable place, person, artefact, plant and animal in Gibraltar in as many languages as possible. This is a large WikiProject; it's at least three times the size of MonmouthpediA. The area of interest includes the British Overseas Territory of Gibraltar, the Strait of Gibraltar, the Spanish municipalities along the coast of the Bay of Gibraltar, the northernmost coast of Morocco and Ceuta. This project also uses NFC technology in addition to QR codes The authors are currently working in Gibraltar to demonstrate geotagging in practise. The project uses open street map to keep track of its progress.
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Topic type
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Target Type
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Case Studies: Relate your experiences.
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People new to open source geospatial
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Additional Presenters
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Name
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John Cummings
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Organisation
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Monmouthpedia
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Email
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mrjohncummings@gmail.com
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Name
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Andrew Ross
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Organisation
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LocationTech
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Email
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andrew.ross@eclipse.org
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Paper Title
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How to Pet the Crocodiles
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I can give a practical demo
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yes
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Paper Abstract (short)
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an amusing yet informative guide on FLOSS project interactions with companies
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Paper Abstract (long)
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If you've not read them, Simon Phipps has a great series of articles comparing companies to reptiles. Quoting: "Crocodiles are not evil; neither are they good. ... Working with them is not a matter of relying on their goodwill. ItÕs all down to understanding their instincts Ð and learning to stand in the right place." His point is that companies are similar and operate in a predictable manner provided you know what to expect. Companies are unavoidable. This talk is an amusing yet informative how-to guide on FLOSS projects interactions with companies. The prize for doing so effectively can be worthwhile up to and including world domination.
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Topic type
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Target Type
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Case Studies: Relate your experiences.
Business Cases: building the economic case.
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People new to open source geospatial
Manager
End User
Technical / Developer
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Name
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Jachym Cepicky
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Organisation
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Help Service - Remote Sensing
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Email
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jachym@hsrs.cz
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Paper Title
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HSLayers status report
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I can give a practical demo
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yes
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Paper Abstract (short)
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Presentation about OpenLayers & ExtJS JavaScript mapping framework and it's old and new features.
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Paper Abstract (long)
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HSLayers (http://hslayes.org) is yet another JavaScript Mapping framework developed since 2007, and used by state organizations, cities and in various European projects. You can use it for building rich mapping portals (even some people say, they do not work), as well as use itÕs parts for improving your simple OpenLayers-based map. Presentation will give you overview about new things in the repository, such as usage of new OpenLayers, LayerSwitcher, OGC OWS manager, usage of OGC WMC for storing the map composition and getting rid of it again, using proprietary JSON format, improvements of the original PanZoomBar and many other features. We are also trying to simplify the graphical user interface for non-GIS expert user, eliminating unnecessary buttons and inputs, while trying to find the way, how to enable advanced functions to the power-GIS user. Certainly, look and feel of the application is determined strongly by usage of ExtJS. Big topic was and still is rewriting of HSLayers to Sencha ExtJS 4. Currently ExtJS 3.4 is used, but new components are written using ExtJS 4 in sandbox mode. But is ExtJS 4 the only right way to go?
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Topic type
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Target Type
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Development: new developments in products.
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Manager
Technical / Developer
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