Swisstopo‘s meticulous Mapping: How Switzerland Stays Ahead of Google with Aerial Precision

Even in the age of high-resolution satellites, Switzerland relies on a boots-on-the-ground (or rather, wings-in-the-air) approach to mapping its terrain. Swisstopo,Switzerland’s Federal Office of Topography,photographs a third of the country each year using aircraft,ensuring unparalleled accuracy that surpasses even the most advanced digital mapping technologies [[2]].

The Art and Science of swiss Mapping

From the skies above Dübendorf military aerodrome, Swisstopo’s red and white Twin Otter takes flight, embarking on a mission to capture every detail of the Swiss landscape.Photographer Carlo Bosco, speaking to SRF, emphasizes the importance of maintaining a constant speed and precise trajectory to ensure each square decimeter of soil is captured with the camera fixed to the plane’s belly. That level of detail-one pixel per two cigarette packs side-by-side-is what sets Swisstopo apart.

Did you Know? Swisstopo offers a mobile app that allows users to download detailed maps of the entire country and plan routes on the hiking network for free [[1]].

Why Aerial Photography Still Matters

While satellites and drones offer option methods for mapping, they can’t compete with the flexibility and image quality of aerial photography in Switzerland. According to Bosco, weather presents the biggest challenge. Airplanes can adjust routes to avoid clouds, a feat impractical for satellites. furthermore, drones are restricted in certain airspaces and lack the capacity to carry the heavy, high-resolution cameras used by Swisstopo.

The Human Touch: Topographers at Work

Back at Swisstopo headquarters in Wabern, near Berne, 35 topographers meticulously process the aerial photos.Tobias Providoli, one of these specialists, compares new images with older versions to identify changes, such as new buildings. Using specialized software, Providoli precisely defines the height, width, shape, and length of each structure.

Pro Tip: Swisstopo’s detailed mapping data is integrated into a topographic model that allows for over 900 different representations of the country.

Switzerland’s Mapping Advantage

“No other country is as well mapped as Switzerland,” says topographer Tobias Providoli. Swisstopo integrates aerial images, radar data, and satellite imagery into a extensive topographic model. This model is used for various applications, from urban planning and solar panel suitability assessments to emergency services and natural disaster prevention.

beyond Google Maps: Practical Applications of Swisstopo’s Data

Swisstopo’s detailed mapping provides critical information that services like Google Maps can’t match.for example, firefighters can use the model to determine weather their vehicles can navigate specific streets. Urban planners can simulate building shadows, and homeowners can assess the suitability of their roofs for solar panels. The model also tracks critical environmental changes, such as glacial retreat and shifting tree lines.

The topographic model is a complex and expensive undertaking, but it provides a crucial foundation for planning across various sectors, benefiting policymakers, businesses, and individuals alike.