At least in the western countries GIS interfaces of administrative entities such as regions and states have become practical and everyday-used tools designed and implemented for all dwellers. The extent of information provided depends on the respective institution and will range from environmental features to administrative information as cadastres or demographic data that can be visualised. However, within the GIS initiative the government of Austria decided to cover the entire country with laser scan flights and provide the information for the broad public as LIDAR derived surface elevation models within the GIS web interfaces. In Austria, public GIS web applications are a federal issue implying that every of the nine regions organises and maintains its own GIS data. Hence, also the LIDAR flights are arranged on a regional level. So far, the laser scan flights for most regions are still in progress or the data are still not accessible to the public. The region of Lower Austria, which is situated in the northeast and surrounds Vienna, already operates a published set of LIDAR data in its GIS-platform.

Every time I have to consult those data, mostly for work, I am highly impressed about the accuracy of a LIDAR derived digital elevation model, which has a vertical resolution of around 10cm. The surface model reveals smallest differences in height as those of little channels, rivers, banks, artificial structures as land fills and waste dumps, tiny differences in heights between adjacent fields and forest roads in the steep slopes of the East Alpes. The laser data can be overlaid by ordinary road maps, cadastres and any other desired GIS layer provided by the platform. The information is highly useful for spatial planners, architects, civil engineers, environmental consultants, administrative entities and scientists, but is also available for any interested person. See some examples of the service below.

Complete map of the region of Lower Austria and its GIS-interface. The white surface in the centre-right is the city of Vienna, which runs an own GIS service and thus is not shown.

The maps show the area around the city of Krems close to the Wachau, UNESCO world heritage and famous for its wine terraces. – The laser scan map (upper image) also visualises land boundaries in an own layer. It greatly reveals a landscape of wine terraces, a small river, but also artificial objects as roads and dams. The bottom image shows an aerial image of the same area.

LIDAR elevation model in the north of Krems showing a landscape of wine terraces (here without land boundaries).

LIDAR elevation model of a mountainous landscape in the south of Lower Austria close to the border of Styria. The meandering structure represents the track of the oldest mountain railway in the Alps, which was constructed in 1854 and is UNESCO world heritage since 1998 (Semmeringbahn). The small lines delineate forest roads in the woody slopes of the Eastern Alps. – LIDAR is able to penetrate forests if they are not too dense.

Did you like this post? Read more and subscribe to our monthly newsletter!