AHN (the current elevation map of the Netherlands)

The AHN is available in various file formats that can be used only within a GIS. If you lack access to a GIS, the Map Room can assist you in making analyses and 2D/3D visualisations.

.agr is an (arc/info) ascii grid file that can be imported by various GIS software programmes including ArcView (with Spatial and/or 3D Analyst) and GRASS. The header provides information about the number of rows and columns, the coordinate of the first point (lower left) and the dimensions of 1 grid cell. The data is arranged in rows separated by returns.

.e00 is an ESRI compressed interchange file.

.xyz is a file in which the data is arranged in three columns. The x, y and z values are given for each cell. This file can be loaded into AudoCad by using a lisp routine (supplied with the data) developed by the Survey Department, after which optional modules such as QuickSurf can be used to generate wireframes and contour lines.

Internet:
Information about the AHN
QuickSurf

 

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