Geological data at the Geological Survey of Denmark and

Greenland (GEUS) have been available on the internet for more than 10 years. The first step in making geological data available online was the launch of web access to data from water supply wells (Tulstrup 2004). The database is called Jupiter, and currently data from more than 260 000 shallow wells are available to the public. Figure 1 shows an example of a map from the Jupiter database available in a web-browser. The first web access was via a text-based search form which supplied data lists and graphical well reports. In re-cent years, the interface has been extended with more data, map interfaces and extra functionality. This paper describes this development and illustrates the increasing value of the digital data at GEUS. In its current form, the Jupiter webpage offers: (1) data on wells, geology, water level and groundwater chemistry, (2) Free, online Danish shallow geological dat