Historical aerial photos/imagery in Tanzania

 Points of view, Review, Spatial data  1 Response »
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 »

Spatial data sources for Tanzania

 How-to, Spatial data  14 Responses »
Jun 092012
 

Finding data online for Tanzania has proved to be a bit of a challenge. This article provides an overview of publicly available sources. We are sure more exists, so just post comments to this message and we will keep updating the table.

Ideally data should be provided by its owners with appropriate meta data. We have decided to minimize our provisions of data because of this. You will find the sources not to be the original ones, but the files might still be useful.

Your input to this process is desired. Please use the commenting system to point us in the right direction for our effort to make an initial meta database for spatial data in Tanzania.

Continue reading »

Hillshade galore

 How-to, OSM, Spatial data  1 Response »
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 »

OpenStreetMap data where?

 How-to, Maps, OSM, Spatial data  2 Responses »
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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