Digital Geography

JuxtaposeJS and the Death (and Re-Birth) of Bogoslof Island

This post is just a quick update on a unique event unfolding in my home state of Alaska and a cool new tool to help you post image sliders on the web.  First, let’s start with the event. The Eruption of Bogoslof Island Over the past few weeks, a volcano has been erupting in Alaska.  This by itself is not that unique, as we have lots of volcanoes and they tend to erupt pretty frequently.  You can check out the current activity for yourself at the Alaska Volcano Observatory.  This most recent eruption is a bit different though.  The island is…

Interactive Space Image Map of ISS-Pictures

The Sojus TMA-13M started on May 28th 2014 from Baikonur to bring the German Alex Gerst, the Russian Maxim Surajew and the American Reid Wiseman to the ISS (International Space Station). Besides the task of the crew to make some experiments etc. on ISS, they show the public how vulnerable and beautiful our blue planet is. There are different ways they try to do it: Regular public calls and interviews to the crew members bring the earth population in contact with the members. If you’re following one of those members on Twitter or Facebook I’m sure you’re impressed by the pictures…

georeferencing images in QGIS using OSM data: how to distort the City

You probably already referenced maps with written coordinates but using photos or images is a little different as you need some characteristic points so you can control the position of the image according to the real world. In this little tutorial I’ll show you how to do a so-called image to image refernciation using Open Streetmap data and QGIS 2.0.1 Dufour.

QGIS Tutorial II: from data to map – preparing data visualisation

In this tutorial I would like to show you, how to create a topographic map and analyse topographical data using freely available SRTM data and QGIS including some data manipulation. This is part one explaining how to get data, remove missing values, explore the relief and changing the color representation of a TIF file obtained by the USGS.

image georeferenciation using ArcGIS 10

Due to a recent article at our German partner geo-works.de I would like to share my two video tutorials for doing this. The first concentrates on the so called image-to-map georeferenciation. Imagine you have some aerial picture that clearly shows a very significant landmark. If you have the real-world geo-coordintes of that you can easily use this method to get your aerial photo joined by a georeference: Another thing is the usage of already georeferenced data like satellite images or shapefiles. This is the so called image-to-image georeferenciation (which is still similar to the mentioned above): So enjoy your new…