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51:29 PGCon - PostgreSQL Conference for Users and Developers, Andrea Ross English 2012

Making your own maps

An introduction in using free Geospatial data PostGIS is an extension to PostgreSQL that turns PostgreSQL into a superb spatial database. Storing spatial data in PostgreSQL is a great way too use up the space on your SSD's however using the data to make maps is much more fun. This talk is aimed at people with limited GIS experience and will talk about how to use OpenStreetMap data for map making. We will tell you how you can get free geo-spatial data from OpenStreetMap and how it can be loaded into a PostGIS database. Common methods of using and accessing your data will be discussed including: Open Source desktop GIS software Generating custom map tiles for use on your website Making pretty paper maps. This talk will introduce common tools and techniques used to with PostGIS when working with OpenStreetMap data. This is a user focused talk suitable for people who have next to no GIS background.
  • Published: 2012
  • Publisher: PGCon - PostgreSQL Conference for Users and Developers, Andrea Ross
  • Language: English
21:18 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2016

Kickstart your web map app!

Do you want to avoid writing boilerplate code for map applications? Would you rather take a ready-made template for your apps and start hacking away the cool stuff? Oskari and RPC may be just what you're looking for! Oskari is an extensible and versatile map application platform which provides an easy user-interface for creating embeddable maps to websites. Embedded maps can be controlled from the website with an API to create innovative and user-friendly applications. The API includes features that allow you to 'visualize data' on the map and/or 'react to user interaction' with the map, allow users to give feedback by 'drawing on the map' or create a custom trip planner with routing features. The API can be easily extended by adding features to Oskari platform. Oskari has been originally developed by the National Land Survey of Finland, but now being developed and used by multiple organizations, also internationally. There are numerous websites already making use of embedded maps, including Finnish national e-services.
  • Published: 2016
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
27:27 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2016

A crowd-sourced public transportation map for Nicaragua's capital

There has been no map for the forty-five bus lines in Metropolitan Managua, where around 1.5 million inhabitants are dependent on buses to commute to work or school. But engaged citizens used Free Technology and the power of collaboration to create the first complete public transportation map of a Central American capital, by using OpenStreetMap and through crowd-sourcing and also crowd-funding methods. We present the final products and talk about the publication of our outcomes as Open Data. We will also mention the local challenges and the nature of creating a map of informal transit information of a partially unregulated bus network It is a case study about Open Geo Software can empower people and enhance development, where information about transportation is lacking.
  • Published: 2016
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
48:16 PGCon - PostgreSQL Conference for Users and Developers, Andrea Ross English 2014

Schema-less data in PostgreSQL

An efficient indexing of nested structures We present a prototype of new access method, heavily based on GIN and optimized for efficient indexing of nested structures like hstore and json(b). Introducing of the nested hstore and jsonb in PostgreSQL brought new challenge to the developers, namely, an efficient indexing of hierarchical keys. Those keys are consist of duplicated strings, which made index to be uselessly huge if store key-value pairs independently. We propose to replace btree data structure, which used in GIN to index keys, by digital tree. To do this in 'right way', we would like to experiment with hybrid access method based on of SP-GiST and GIN. This is a first step in making GIN more flexible to support richer set of queries. In principle, one could be able to use other than btree data structure to index not just keys, but also the posting lists.
  • Published: 2014
  • Publisher: PGCon - PostgreSQL Conference for Users and Developers, Andrea Ross
  • Language: English
50:23 PGCon - PostgreSQL Conference for Users and Developers, Andrea Ross English 2014

GIN in 9.4 and further

This talk presents set of GIN advances in PostgreSQL 9.4 and further which brings GIN to new level of performance and extendability. Most important advances are: posting lists compression, fast-scan algorithm, storing additional information and index-based ranking. This talk presents set of GIN advances: Compression posting lists. Indexes become 2 times smaller without any work in opclass. pg upgrade is supported, old indexes will be recompressed on the fly. Fast scan algorithm. Fast scan allows GIN to skip parts of large posting trees during index scan. It dramatically improve performance of hstore and json search operators as well as FTS "frequentterm & rareterm" case. In order to use this improvement three-state logic support required in "consistent" opclass method. Storing additional (opclass defined) information in posting lists. Usage of additional information for filtering enables new features for GIN opclasses: better phrase search, better array similarity search, inverse FTS search (search for tsqueries matching tsvector), inverse regex search (search for regexes matching string), better string similarity using positioned n-grams. Index based ranking. This improvement allows GIN to return results in opclass defined manner. Most important application is returning results in relevance order for FTS which dramatically reduces IO load. But there are other applications like returns arrays in similarity order. We present the results of benchmarks for FTS using several datasets (6 M and 15 M documents) and real-life load for PostgreSQL and Sphinx full-text search engines and demonstrate that improved PostgreSQL FTS (with all ACID overhead) outperforms the standalone Sphinx search engine.
  • Published: 2014
  • Publisher: PGCon - PostgreSQL Conference for Users and Developers, Andrea Ross
  • Language: English
15:47 River Valley TV English 2011

Selected Phython Scripts for Scribus

  • Published: 2011
  • Publisher: River Valley TV
  • Language: English
21:51 River Valley TV English 2012

GNU LibreDWG - a free software library to handle DWG files from AutoCAD

LibreDWG is a library to handle files in the DWG format used by AutoCAD. I will present a general overview of the history of the project, explaining how a group of students at the University of São Paulo developed a new and relevant free software library (listed in the FSF High Priority Projects List) and how it became approved as an official GNU package.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
25:09 River Valley TV English 2012

Icon Workflows with Inkscape

Learn how to worry less about the file system and more about your artwork in this overview of Inkscape workflows. Various details of the workflow and tools are discussed with specific examples from projects including, but not limited to, Firefox, GNOME and Moblin.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
52:35 River Valley TV English 2011

Tau Meta Tau Physica - Open Source Digital Pattern Making software

* I. Presentation of project development during the previous 12 months. o I1. Description of software development from manual technique to procedural code to object oriented code. o I2. Discussion of how the pattern was separated out, leaving a generic engine. This coding approach allows the designer to retain pattern rights while the engine is open source software. * II. Illustration of how a beginner can develop an idea and take it forward. * III. Presentation of current product.
  • Published: 2011
  • Publisher: River Valley TV
  • Language: English
35:59 DjangoCon US English 2017

The Power and Responsibility of Unicode Adoption

Communication is difficult. Whether between humans, machines, or a combination of the two, trying to translate meaningful information is a lossy process. Converting programming languages to use the new Unicode standard is hard, but once it’s in place, you get this marvelous feature-add: emoji compatibility. No longer do we have to make faces with symbols or use platform-specific emoticons. Rejoice in the extended character set. Emoji have a rich history as a way to allow the communication of ideas in a reduced amount of data. They date back to a time where this was important: SMS communications in Japan. However, as social networks feverishly try to clamber onto this bandwagon, their implementations of the standard create issues with miscommunication that aren’t possible with a 12×12 pictograph. We’ll discuss the history of emoji, cross-platform adoption, the Unicode standard, and emoji accessibility in web applications.
  • Published: 2017
  • Publisher: DjangoCon US
  • Language: English
37:14 DjangoCon US English 2017

Accessibility Matters: Creating a Better Web

Overview This talk will go through accessibility concerns on the web through example sites and code with both good and bad accessibility to experience what some users have to struggle with daily. We will cover well-known concerns such as low vision/color blindness and deafness, as well as attention issues and autism, and discuss the limitations and abilities of various alternative input devices that people with motor control issues rely on. Short and long-term fixes will be demonstrated and taught, with the overall goal being that the participants leave knowing how to find and solve accessibility problems. Why Bother With Accessibility Not only should you want everyone to be able to easily use your site, but having an accessible website comes with a variety of benefits. According to the U.S. Census Bureau, around 19% of Americans have a disability, which is a large potential audience for any site. Many companies also fall under accessibility laws they might not even be aware cover their products, with lawsuits becoming more prevalent in recent years, and showing a good faith effort to improve your products’ accessibility can help keep your company out of hot water. Accessible web development also tends to lead to better UX and a happier user base. And, another plus: It will save devs time and frustration when they’re working with the code, since good HTML is enforced. Who This Talk Is For Anyone who wishes to learn more about accessibility. While we won’t be going over the absolute basics of accessibility in detail, the examples and resources will be easy to understand for people with very basic knowledge of web development.
  • Published: 2017
  • Publisher: DjangoCon US
  • Language: English
28:14 Confreaks, LLC English 2017

SVG Animation and Interaction in Ember

Creative. Lively. Interactive. What if even a beginner-level Ember app could be all these things? SVG is a flexible, vector-based image format that lets you manipulate image elements in the same way that you already work with divs. It’s almost as simple to write a class binding for a star in a constellation as it is to write it for a checklist item. Learn how Ember’s out-of-the-box behavior can be used to build things like progress meters, interactive diagrams, and charts.
  • Published: 2017
  • Publisher: Confreaks, LLC
  • Language: English
21:33 Confreaks, LLC English 2015

Dynamic Graphic Composition in Ember

Ember's declarative object model and data-binding make it an excellent fit for building data visualizations that respond to change. This talk presents two ways to think about building dynamic SVG visualizations in Ember in the context of Hadley Wickham's The Grammar of Graphics. Along the way various subjects will be discussed, including code reuse and composition with Ember components and D3, imperative vs. declarative style tradeoffs, and tips and tricks for making visualizations easy to build and use.
  • Published: 2015
  • Publisher: Confreaks, LLC
  • Language: English
50:33 Free and Open Source software Conference (FrOSCon) e.V. English 2016

Creating printable maps

There are a lot of online services that produce nice maps from OpenStreetMap data, but only very few that generate output suitable for printing. This talk is going to present MapOSMatic, a service that produces large scale single and multi page high resolution maps.
  • Published: 2016
  • Publisher: Free and Open Source software Conference (FrOSCon) e.V.
  • Language: English
1:02:01 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2014

Mapping for Investigations

Closing Keynote Speech, FOSS4G 2014, Portland, Oregon.
  • Published: 2014
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
52:28 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2014

The Toolmaker’s Guide

Opening Keynote, FOSS4G 2014, Portland, Oregon
  • Published: 2014
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
30:22 River Valley TV English 2012

SVG - News and Plans

  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
23:15 River Valley TV English 2012

Diffusion Curves in Inkscape vector drawings

Diffusion Curves are an exciting and flexible new primitive for creating images with smooth color transitions. However, the best method to display diffusion curves so far is to rasterize them, which is unsuitable for use with SVG for example. I will present the basic idea behind Diffusion Curves, an alternative interpretation and an approach to creating a purely vector based representation (discussion welcome).
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
27:24 River Valley TV English 2012

Inkscape for everybody

Inkscape’s popularity is growing day by day. How do we help new users master the tool? How do we welcome these users and invite them to participate in the community and contribute their art, their bug reports and their ideas to help us innovate? This talk briefly summarises the available resources out there from online tutorials, screen-casts, channels & forums to the offline books, magazines, courses, classes and user groups. Half talk, half debate, this session aims to set the scene for a discussion on the issues of supporting new users, and explore ways to do it better by sharing ideas and working together.
  • Published: 2012
  • Publisher: River Valley TV
  • Language: English
19:59 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2014

Creating Charts and Legends for 3D Atlas Maps - A Mashup of D3.js, osgEarth, and the Chromium Embedded Framework

This presentation introduces a mashup of the JavaScript library D3.js, the virtual globe toolkit osgEarth, and the web browser engine Chromium Embedded Framework. Using the example of a national atlas, it is demonstrated how these OpenSource frameworks facilitate the creation of charts and legends for a series of three-dimensional maps.First, it is explained how a map in osgEarth can be styled with D3 scale functions. Legends for choropleth, line, symbol, and grid maps are derived therefrom. They allow to depict unique values, value ranges, and combinations of those having two dependent variables. Also legend templates for color gradients and hierarchical categories have been developed. All legends are superimposed the virtual globe by means of the Chromium Embedded Framework.Next, six widely used chart types - i.e. pie, ring, wing, divided area, bar, and divergent bar charts - with individual properties are presented. Charts are defined with aforementioned styling functions, created with D3.js, and displayed as billboards in the virtual globe.Finally, a live demo is shown, current limitations are discussed and future work of the atlas project is outlined.
  • Published: 2014
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
46:39 Chaos Computer Club e.V. English 2015

Bugged Files

Certain file formats, like Microsoft Word and PDF, are known to have features that allow for outbound requests to be made when the file opens. Other file formats allow for similar interactions but are not well-known for allowing such functionality. In this talk, we explore various file formats and their ability to make outbound requests, as well as what that means from a security and privacy perspective. Most interestingly, these techniques are not built on mistakes, but intentional design decisions, meaning that they will not be fixed as bugs. From data loss prevention to de-anonymization to request forgery to NTLM credential capture, this presentation will explore what it means to have files that communicate to various endpoints when opened. "unicornFurnace"
  • Published: 2015
  • Publisher: Chaos Computer Club e.V.
  • Language: English
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Version

AV-Portal 3.8.0 (dec2fe8b0ce2e718d55d6f23ab68f0b2424a1f3f)