Aug 012012
 

In 2009 Brian Kuns with Stocholm University wrote a memo titled “Towards an Inventory of Historical Aerial Photos of Kenya, Tanzania and Uganda”. The memo represents a preliminary overview of archival resources containing historical aerial photographs of East Africa.

I have taken a look at the memo and in this article I will try to focus on any Tanzanian sources of data in most part using Kuns memo. I will also throw in some reflections of my own on historical aerial photographs and what lies ahead of us. Continue reading »

May 302012
 

Hillshades are made by processing georeferenced digital elevation models. The process places a virtual light source above an elevation model and calculates which areas are lightened up and which fall in the shadow. Light characteristics, vertical/geographical source will be determinant for the hillshade.

Some years ago I prepared a hillshade model for Tanzania. It was fun and before I knew it I had prepared elevation models for seven more countries.

This article points to a file gallery where the files are available for download. Continue reading »

May 252012
 

Several times the last months we have suggested GIS-users start using OpenStreetMap data. But we have failed to say where you can find the actual files. They are of course available for download.

In this article we will give an overview of where you can download shapefiles based on OSM data and also how you can contribute to the project. Continue reading »

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