Quality of the location data
The main precursor to the borehole database in DINO is the borehole archive established by the National Institute for Drinking-Water Supply (RID). For many years, TNO-NITG maintained these data together with the Geological Foundation and later with the National Geological Survey (RGD). In the early eighties, these data were entered into computer files at both the former DGV-TNO and at the RGD. Since the formation of TNO-NITG as part of the daily management of DINO Boreholes, the quality of the data is checked.

One thing that needs checking is the location data. In some cases, different borehole sites are located close together, usually in well fields for water production. In the past, these places were labelled in the archives for all boreholes with a single pair of co-ordinates situated in the middle of the area concerned. These "clusters" can still be found in DINO, and that interferes with an exact location positioning. Checking and correcting these clusters is one of the tasks of the "Kwaliteits Verbeterings Project" (Quality Improvement Project) that TNO-NITG has launched in order to optimise the database.

An important aspect of the location data is the height of the surface level. Two methods were traditionally used to determine this. The first was land surveying, which determined the height of the surface with great precision. Mostly levels have been determined in the past by using the TDN Height Map 1:10 000. More information on this topic can be found on the page Quality Improvement Project.

Go to the start page to select a datatype and make a request, or use the grafical selection to select data, or go to the page Enter Selection Criteria for boreholes.

For more information, contact: info@dinoshop.nl