Earth & Environment

7-4-2009

Transboundary Aquifers of the World

At the 5th World Water Forum in Istanbul IGRAC presented a new map of Transboundary Aquifers of the World. An earlier map with the same theme was published in 2006 by BGR in the WHYMAP framework.

The new map is a great improvement to the earlier one, as at that time the only way to indicate the aquifer’s location and extent was by using ovals and circles. This led to the funny misconception amongst some laymen that aquifers are always circular or oval!

So, this time, the Transboundary Aqfuiers (TBA) map depicts the actual location of the aquifer boundaries. For as far (publicly)  known, and for as accurately we can represent them on a global map with scale of 1 : 50 000 000 at the equator.

The GIS editing was done by me and my colleague Joseph Reckman. The text on the back was edited both by us and Frank van Weert, Slavek Vasak and Neno Kukuric.

The map was based on several data sources depicting regional TBA information. For some of these, IGRAC already had GIS information, for others paper maps had to be digitized and georeferenced.