Blogs

Uitgebreidere beschouwende artikelen (blog-achtig) over technische en organisatorische ontwikkelingen bijgedragen door leden en sponsors van onze community. Wil je jouw blog hierbij hebben? Laat het ons weten.

GeoCat

  • Mixed content and cross domain errors in browser-SDI 18-06-2017 Paul van Genuchten
    Browser based Spatial Data Infrastructure typically combines data from a variety of domains on a single web application (for example GeoNetwork). There are two typical errors that block optimal user e …
  • GeoNetwork and the search engines 14-06-2017 Paul van Genuchten
    Currently GeoNetwork records are hardly harvested by search engines. There are some problems that can be addressed quite easily to improve this. This post presents some findings from the implementatio …
  • GeoCat Diamond OSGeo Sponsorship 20-03-2017 Jeroen Ticheler
    GeoCat continues its commitment to open source with a Diamond Sponsorship of the Open Source Geospatial Foundation for 2017.
  • Announcing the Extended GeoPackage QGIS Plugin 16-03-2017 Joana Simoes
    Migrating a project from ESRI (or another) software to QGIS is a common challenge in the GIS world. With the OWS_Context Geopackage extension and the qgpkg plugin, we hope to address this challenge, a …
  • Extending GeoPackage to include Project/Styling information 03-03-2017 Paul van Genuchten
    This Blog post introduces some of the work GeoCat is working on to satisfy your mapping needs. You probably remember a situation in which you were looking to a mapping project in say ArcGIS, a webpage …

OpenGeoGroep

  • Overheid 360°: 22 en 23 april 17-04-2015 Get Interactive
    OpenGeoGroep op Overheid 360° De OpenGeoGroep staat op 22 en 23 april op Overheid 360° in de Jaarbeurs in Urecht. Wij vertellen u tijdens deze dagen graag meer over open source oplossingen en ideeën v …
  • Inschrijving klantendag OpenGeoGroep Klantendag 2015: 10 september 15-04-2015 Get Interactive
    Inschrijving voor de OpenGeoGroep Klantendag geopend! Kom naar Utrecht en laat u in 1 middag informeren over onze producten en projecten.   Verdieping Op donderdag 10 september vindt de OpenGeoGroep K …

GISNederland – Gert-Jan van der Weijden

Just Objects – Just van den Broecke

  • Dances with the GeoPython Tribe 13-07-2016
    During June 21-24, 2016 I attended the very first GeoPython Conference in Basel Switzerland. This event was organized by the Institute of Geomatics Engineering of the FHNW – University of Applied Scie …
  • Deploying Open Source Geospatial Software – Part 1: Challenges 10-06-2016
    My blog has been quiet for some time. As many of us I’ve been busy doing projects, all involving Open Source Geo (OSGeo) software. Partly development, writing software, I love it, but also more and mo …
  • Unlocking Sensor Data – I’ll send an SOS to the world 01-10-2015
    Revealing: the title refers, for the younger readers, to a great 1979-hit by The Police as expanded below. To be played at the loudest possible volume. If you don’t see anything here below try the You …
  • GPS Hiking and The Evolution of Navigation 26-08-2015
    On sunday August 25, 2015 I provided a talk/workshop for a local knowledge network of friends and acquaintances in Amsterdam. TLDR; see gps.justobjects.nl.  Originally, I would talk about “Hiking with …
  • JPEG is Dead, Long Live JPEG! 21-05-2015
    TL;DR: see this GitHub issue for summary (Dutch but the pictures there and Figure 1 tell the story). Somewhere around 1995, building my first website, it was already quite a feat to embed images. Non- …

Ecostudies – Paulo van Breugel

  • K-fold cross validation in GRASS GIS 27-07-2017
    A common technique to estimate the accuracy of a predictive model is k-fold cross-validation. In k-fold cross-validation, the original sample is randomly partitioned into a number of sub-samples with …
  • GRASS GIS 7.2.1 released 10-05-2017
    After four months of development the new update release GRASS GIS 7.2.1 is available. It provides more than 150 stability fixes and manual improvements compared to the first stable release version 7.2 …
  • Plotting GRASS data in Python 24-04-2017
    GRASS GIS offers some useful but basic plotting options for raster data. However, for plotting of data in attribute tables and for more advanced graphs, we need to use other software tools. In this tu …
  • GRASS and Pandas – from attribute table to pandas dataframe 07-04-2017
    Introduction In this post I show how to import an attribute table of a vector layer in a GRASS GIS database into a Pandas data frame. Pandas stands for Python Data Analysis Library which provides high …
  • Update r.vif add-on for GRASS GIS 31-03-2017
    I just updated the r.vif add-on. The add-on let’s you do a step-wise variance inflation factor (VIF) procedure. As explained in more detail here, the VIF  can be used to detect multicollinearity in a …

Nederlandse QGIS Blog

  • 3D data visualiseren met expressies 14-08-2017
    Laatst kreeg ik de vraag om de blootstelling aan geluidsoverlast in beeld te brengen voor een aantal woningen. Op zich niet moeilijk, ware het niet dat het hier ging om gebouwen met meerdere woonlagen …
  • De QGIS BGT plugin 16-07-2017
    Jan-Willem van Aalst schreef een mooi stukje over het gebruik van de BGT in QGIS met als voorbeeld weer een van zijn bekende prachtige kaarten. Hiervoor is het wel nodig om de complete BGT in Postgis …
  • Zelf met de BGT in QGIS werken 18-06-2017
    De Basisregistratie Grootschalige Topografie (BGT) begint al aardig gevuld te raken. Deze open overheidsdata wordt 2x per maand aangeboden door NLExtract in PostGIS formaat. Zie: http://data.nlextract …
  • Georefereren van een medaille 11-06-2017
    Gisteren liep ik de halve marathon van Zwolle met mijn petje op met het vorige QGIS logo. Mijn tijd was zo niet bijzonder (2:08:47) maar de medaille die ik daarmee verdiende wel. Het bevat een platteg …
  • Gray is the new Black 19-03-2017
    Soms wil ik mijn kaart (printvormgeving…) niet in zwart maar in grijs opmaken. Maar QGIS maakt alle items die ik aan mijn kaart toevoeg standaard zwart. Om de kleur eenvoudiger en sneller aan te passe …

Internationaal – planet.osgeo.org

De belangrijkste “aggregatie-website” in de Open Source geo-wereld. Hiermee blijf je op de hoogte van alles wat daar speelt.

  • geography type is not limited to earth 20-08-2017
    It's a little known fact that the PostGIS geography type since PostGIS 2.2 (well was introduced in 2.1 I think but had a bug in it until 2.1.4 or so), supports any spheroidal spatial reference sy …
  • Using PM2 to manage NodeJS cluster 20-08-2017
    The cluster module allows us to create worker processes to improve our NodeJS applications performance. This is specially important in web applications, where a master process receives all the request …
  • Using cluster module with HTTP servers 18-08-2017
    The cluster module allow us improve performance of our application in multicore CPU systems. This is specially important no matter if working on an APIs or an, i.e. ExpressJS based, web servers, what …
  • Making GovHack (and Open Government) more impactful 18-08-2017
    I've finally attended the GovHack weekend. As a dad, weekends used to be for taking kids to birthday parties and soccer games. But my boys have grown up, giving me the chance to see how GovHack c …
  • #FOSS4G give to the 2018 Travel Grant Programme NOW 16-08-2017
    I am sitting at FOSS4G with a little smile on my face. We have just handed out the last of ten travel grants to people who would not have been able to have make the trip to Boston without our support. …

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