ragnvald

Works as an engineer with the Norwegian Environment Agency. Has spent a lot of time in Tanzania over the years. Now working with NEMC in Tanzania on data management. Most office hours are in Trondheim, Norway.

Oct 152017
 

The program committee for FOSS4G in Dar isready for collecting your proposals for the Academic Track.

TO submit we advice you to carefully read the instructions here:

http://2018.foss4g.org/call-for-papers.html

The first step is to upload your abstract (500-800 words) by November, 20 2017.

The Scientific Committee will accept the best proposals (deadline 15 December) which will go to the second step. This will be camera ready paper for the Proceedings by 31 March 2018.

Remember that you MUST register (at least one author for one paper) to the Conference for having your paper published. Therefore the registration is mandatory before 31 March 2018.

Aug 152013
 

I am happy to announce that aqdgc_logo new set of the Quarter Degree Grid Cell shapefiles has been generated. This time the coverage is global and the publication is for individual countries.

The QDGC shapefiles contain center lon/lat coordinates and the QDGC string for the different squares. Continue reading »

Nov 142012
 
GIS day

Celebrating GIS in Arusha

Open day on map making and GIS at the Conservation Resource Centre, 14 November

The Conservation Resource Centre (CRC) is a small (but helpful!) non-profit educational organisation based in Arusha that works with students and researchers in science and conservation.

If you’re interested in learning about using maps, using a GPS, or making your own maps, the CRC is hosting an informal ‘open day’ for World GIS Day on the 14th of November, which will be an opportunity for hands-on use of GPS units, a chance to talk to people who use GPS and computerised mapping professionally, and to learn about free and open-source applications for making your own maps. Continue reading »

Sep 162012
 

OpenStreetMap has updated their satellite imagery covering parts of Arusha and Serengeti. The imagery is delivered by Bing (Microsoft) and allows for tracing of roads and buildings in the mentioned areas. Microsoft has updated much of their imagery covering Tanzania the last year. The additions covered in this article represent important foundations for further developing the OpenStreetMap maps.

Continue reading »

Aug 202012
 

For those of you who do not know what Wikipedia is, the short version is that Wikipedia is “[..] a multilingualweb-basedfree-content encyclopedia project based on an openly editable model.” (Source: Wikipedia). This article is about relevant GIS/geography articles in Wikipedia related to Tanzania.

A version of this article was posted back in August 2007. Since then the body of literature on Tanzania in Wikipediahas continuously been growing. Both the English and the Swahili articles. The number of Swahili articles as of today number 24.126. The articles cover a wide number of themes, many of the not directly related to Tanzania.

Continue reading »

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 »

Jun 182012
 

The recent changes in alternatives for communicating with other participants in the TZGISUG community involves option for commenting on postings on this website. It also involves an option to post messages in dedicated forums.

This posting is a walk-through of the different options for interacting through the TZGISUG website. Continue reading »

Jun 182012
 

The Tanzania GIS User group mailing list has been a rather quiet place the last year or so. Much of this is due to the fact that many GIS practitioners find answers to their questions in forums and mailing lists elsewhere. After some discussion and a lot of thought, time has come to make some changes for TZGISUG. Without being totally revolutionary, we hope that you will all follow us on this journey towards more structure and more communication in our community.

We are now offering an addition to the mailing list on the TZGISUG website a set of forums with the themes “Announcements”, “FAQ” and “General”. The mailing list will not be discontinued, but we encourage people to use the forum on the TZGISUG website for announcements and comments to Frequently Asked Questions (FAQ). Our rationale is to focus our community somewhat. Basically we see the need to build a centralized knowledge base – strengthening the web site as a communication platform is one way forward. We also need to start thinking about how we can refine a meta-database on spatial data as well – while there isn’t much call for hosting data ourselves, maintaining a directory of ‘how-to-find spatial data’ IS probably worthwhile, and the forums will allow discussion about the various merits of the datasets.

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 »

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