Earth Data Namibia
Welcome to the web presence of the Geological Survey of Namibia's integrated geoscience and mineral exploration database Earth Data Namibia (EDN).
EDN is NOT a system managing mineral licences but a reference database storing geoscientific factual and metadata, including information from more than 50 years of mineral exploration in the country. This web application allows the user to query select modules of the database (e.g. mineral deposits, historic licences, archival reports on mineral exploration) and display them in a GIS application on a variety of backdrops (e.g. geological map, satellite imagery, aeromagnetic map, topographic map). Please note that due to the nature of this information system all mineral licences are shown with their original outlines, e.g. any reduction in size in case of licence renewal is not reflected here. To overlay the actual current licence file as updated by the Directorate of Mines choose either Granted Licenses or Pending Licences.
Although EDN exists since 2003 as a local public information system, this web application is a new addition and still in its development phase. If you have any suggestions or comments, please contact the administrators.
To obtain archival exploration data in digital format contact the Sales Department.
This application consists of two parts, which are accessible through the menu on the upper left of this page:
The web application has been developed using open source technologies.
The Database page contains tab-pages enabling the user to query the following database modules
- Mineral Occurrences
- Historic Licences
- Archival Exploration Reports
Click Mineral Occurrences, Historic Licenses or Exploration Reports at the top of the page and enter your search criteria into the available input fields (e.g. mineral occurrence name) or select your choice from a dropdown list (e.g. commodity). Then click Query Database to retrieve the requested information. Clear Input Fields empties all input fields for a fresh query.
The information returned by the database is displayed below the input field. If more than five matching records have been found, links to the following pages are displayed at the top and bottom of the page. To display the spatial extent of the retrieved record (areas of interest) in GIS click .
The Spatial Data page contains an interactive map of Namibia, offering various thematic layers (e.g. mineral occurrences, historic licences and exploration reports), as well as various background maps.
The map contains navigational controls to
- pan the map horizontally and vertically ,
- zoom to the full map extent and
- a zoom slider for zooming in and out . Alternatively, you can use the scroll wheel of your mouse for zooming in and out.
All available layers, arranged in five thematic groups, are displayed to the left of the map. To open or close a layer group click or , respectively. The layers are divided into overlays and base layers: note that several overlays can be displayed on top of one base layer.
Overlays have a checkbox preceding the layer name. To display an overlay layer on the map tick the corresponding checkbox. Untick the checkbox to remove it from the map. In most cases labels can be displayed for overlay layers. To turn labels on or off click or , respectively.
Base layer names are preceded by a radio button. Only one base layer can be displayed at a time. To display a base layer click the corresponding radio button. To turn off the display of any base layers click None.
A toolbar is located above the map, which provides easy access to important functionalities. Tooltips are available for the buttons of the toolbar.
Click on to switch to navigation mode. This is the default mode of the map display.
In addition, map navigation can be
- directly with the mouse and
- by specifying a rectangular zoom area.
Press the left mouse button on the map and move the mouse to move the map. Hold down the shift key and press the left mouse button to specify a zoom area.
Click on to switch to measurement mode. The current length of a polyline is displayed in a floating tooltip. Double click to stop measuring.
Click on to switch to selection mode. This mode is only available, if one of the thematic layers connected to the database is activated.
The dropdown list next to shows currently displayed thematic layers from which features can be selected. Use this list to activate the layer to select from. To select and unselect features you can
- click on the map to select one feature,
- press the left mouse button and draw a rectangle to select several features,
- hold down the shift key to add to your current selection of features,
- hold down the ctrl key and select already selected features to remove them from the selection.
To retrieve the database information of selected features click on to send your selection to the Database page.
To remove all selected features from the map click on .
Click on in the top right corner to display a graticule on the map. Click on again to turn the graticule off.
Click on in the top right corner to turn the overview map on. The overview map is displayed in the lower right of the main map. Click on again to hide the overview map.
Below the layer switcher the real world coordinates of the mouse pointer are displayed in UTM coordinates as well as in geographic coordinates.