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Visualizing NASA Black Marble with Tilemill and Leaflet
Some days ago NASA has released “Black Marble”, an image of the world by night, a combination of photos taken by a new satellite. Its name was chosen according to the “Blue Marble” image, released...
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geoJSON with QGIS and leaflet: from data to map
The new JSON Format GeoJSON allows you to easily embed geographical features in your leaflet webmap. Additionally you can create it very easily in the open source GIS QGIS aka Quantum GIS. In this...
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QGIS Tutorial III: from data to map – visualize data in a map
In our last session we started with some topographic “pre”-map as we prepared everything to create a printable map with QGIS which shows heights in a special area. As the map creation itself is somehow...
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unsupervised classification in QGIS: kmeans or part two
As I have already covered the creation of a layer stack using the merge function from gdal and I’ve found this great “plugin” OrfeoToolBox (OTB) we can now move one with the classification itself. I’ll...
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OpenSource QGIS + PostGIS installation: “the Ubuntu way”
A lot of you out there are probably working on Windows Systems using ArcGIS and I have to admit that the possibilities with ArcINFO in the background and a proper GDB (GeoDataBase) are really big. But...
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OpenSource QGIS + PostGIS installation: “the Windows way”
A short time ago I’ve posted an article on the installation of QGIS in combination with a PostGIS database in the background. As we all know, Windows is mostly used as OS on a PC so this is the...
View ArticleInstall QGIS 2.0 on Ubuntu
Today QGIS 2.0 was officially released and we will come up with several tutorials in the next weeks. First of all: the installation. As we are fans of open source we would like to show you the...
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QGIS 2.2 on Ubuntu Trusty Tahr 14.04
QGIS on Ubuntu Trusty Tahr I’ve have started working nearly 100%, outside of work, in Ubuntu. I was running Ubuntu 13.10 so naturally I decided to upgrade to 14.04. My experience has been positive...
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How to build your own QGIS plugin
Since I’ve created the QGIS plugin qgis2leaf I was surprised how easy it is to create a plugin for QGIS. In this post I would like to show you how to build a basic buffer-plugin and give some tips for...
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From CSV To Heatmap With Leaflet
There are so many applications out there but they probably share one thing: export your data as a XXX-delimited table. And it’s also very easy to create a comma-separated text file out of it. You also...
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Raster Comparison using ArcGIS
In one of the biggest groups of geoscientists in Germany, Austria and Switzerland the question arose how to do a raster comparison in ArcGIS. I’ve already mentioned some aspects of it in a short...
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What is better: a map or a picture?
from Wikipedia: View of Beijing from the CTS Hotel. This is intersection of Airport Expressway and 3rd Ring Road. I was reading an article entitled “China, the megalopolis of 110 million inhabitants...
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Extracting information from Sentinel-1
SAR images can see through clouds and in darkness, and are therefore very useful for operational monitoring of our seas. Detecting ships, icebergs, wind patterns, and oil spills is daily business in...
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Using Sentinel-2 for crop monitoring
Sentinel-2 is the optical satellite of the Copernicus programme. It can be compared to Landsat, although it has a better resolution, of 10 to 20 meters. We’ll be using it for crop monitoring with...
View ArticleObserving deforestation with Sentinel-1
While preparing for an upcoming presentation at the annual meeting of the American Geophysical Union (AGU) I came across a topic that I thought might make an interesting blog post. The presentation is...
View ArticleRaster Comparison using ArcGIS
In one of the biggest groups of geoscientists in Germany, Austria and Switzerland the question arose how to do a raster comparison in ArcGIS. I’ve already mentioned some… The post Raster Comparison...
View ArticleWhat is better: a map or a picture?
I was reading an article entitled “China, the megalopolis of 110 million inhabitants that impresses the world” on a popular online journal (see article) and after a dozen… The post What is better: a...
View ArticleExtracting information from Sentinel-1
SAR images can see through clouds and in darkness, and are therefore very useful for operational monitoring of our seas. Detecting ships, icebergs, wind patterns, and oil spills… The post Extracting...
View ArticleUsing Sentinel-2 for crop monitoring
Sentinel-2 is the optical satellite of the Copernicus programme. It can be compared to Landsat, although it has a better resolution, of 10 to 20 meters. We’ll be… The post Using Sentinel-2 for crop...
View ArticleObserving deforestation with Sentinel-1
While preparing for an upcoming presentation at the annual meeting of the American Geophysical Union (AGU) I came across a topic that I thought might make an interesting blog… The post Observing...
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