Federal Office of Public Health (FOPH)

Radioactivity in the atmosphere

Radioactivity in the atmosphere

Concentration of aerosol-bound radioactivity in outdoor air at 6 stations operated by the Environmental Radioactivity Section URA of the Federal Office of Public Health (FOPH). The filters of the high-volume aerosol collectors are changed weekly and then analyzed using gamma spectrometry (HPGe). The latest available measured values are shown in micro-becquerels per cubic metre (µBq/m3).

Federal Office for the Environment FOEN

Vegetation height model NFI

Vegetation height model NFI

Information on the vegetation height is determined using remote sensing methods with active and passive sensors. LiDAR is an active sensor. An optical sensor, for example an aerial camera, is a passive sensor. LiDAR is incorporated in Switzerland on a regional, cantonal and national level. However, no regular update concept exists. Stereo aerial photos are regularly recorded on a national level in a three year cycle. Regular 3D data sets and digital surface models (DSM) with a high resolution are created from this predictable core data from swisstopo within the framework of the National Forest Inventory (NFI). From the difference between the DSM and the digital terrain model by swisstopo (swissAlti3D), a normalised digital surface model (nDSM) is calculated. Buildings are eliminated using a combination of the ground areas of the swisstopo topographic landscape model (TLM) and spectral information from the stereo aerial photos. The end result is a model of vegetation height (vegetation height model VHM) in Switzerland.

Federal Office for the Environment FOEN

Relief shading of vegetation height model NFI

Relief shading of vegetation height model NFI

Information on vegetation height is determined using remote sensing methods with active and passive sensors. LiDAR is an active sensor. An optical sensor, for example an aerial camera, is a passive sensor. LiDAR is incorporated in Switzerland on a regional, cantonal and national level. However, no regular update concept exists. Stereo aerial photos are regularly recorded on a national level in a three year cycle. Regular 3D data sets and digital surface models (DSM) with a high resolution are created from this predictable core data from swisstopo within the framework of the National Forest Inventory (NFI). From the difference between the DSM and the digital terrain model by swisstopo (swissAlti3D), a normalised digital surface model (nDSM) is calculated. Buildings are eliminated using a combination of the ground areas of the swisstopo topographic landscape model (TLM) and spectral information from the stereo aerial photos. The end result is a model of vegetation height (vegetation height model VHM) in Switzerland.

Federal Office for the Environment FOEN

Forest mix rate NFI

Forest mix rate NFI

Information on the degree of forest mix rate NFI is modelled using remote sensing methods. Based on the freely available Copernicus (ESA) Sentinel-1 and -2 satellite data (image stacks from previous years), the proportion of deciduous and coniferous trees is evaluated nationwide in grid cells with a spatial resolution of 10 metres. A machine learning method is used for this purpose. Interpreted polygons of aerial photographs serve as reference data for the modelling. Each raster cell carries the information on the proportion of deciduous trees. The data set refers to all stands nationwide, not only to the LFI forest area. The spatially explicit forest mix rate NFI may differ from the mix rate NFI of the terrestrial sample survey. In the terrestrial determination of the degree of mixing, the basal area ratio of deciduous and coniferous trees is used. In the case of the forest mix rate NFI based on the Sentinel-1 and -2 satellite data, the ratio of the visible tree crowns of deciduous and coniferous tree proportions is calculated.

Federal Statistical Office

Service to the population: accessibility of pharmacies

Service to the population: accessibility of pharmacies

Die Messung der Entfernung zu Dienstleistungen für jede bewohnte Hektare in der Schweiz stellt vielfältige statistische Informationen über den Zugang zu Gütern, Dienstleistungen sowie Rückzugsorten zur Verfügung. Eine ausreichende Grundversorgung mit den im Alltag benötigten Gütern und Dienstleistungen sowie Zugang zu Rückzugsorten wie Seeufer oder Wälder, sind für die Lebensqualität von grosser Bedeutung. Die Berechnung der Erreichbarkeit zu diesen Dienstleistungen ist eine Methode um dieses Phänomen zu messen. Die Erreichbarkeit wird durch die auf dem Strassennetz zurückgelegte Distanz zwischen dem Wohnort und dem Standort des nächstgelegenen Dienstleisters, respektive des nächstgelegenen Rückzugsorts, operationalisiert.

Federal Statistical Office

Service to the population: accessibility of restaurants

Service to the population: accessibility of restaurants

Die Messung der Entfernung zu Dienstleistungen für jede bewohnte Hektare in der Schweiz stellt vielfältige statistische Informationen über den Zugang zu Gütern, Dienstleistungen sowie Rückzugsorten zur Verfügung. Eine ausreichende Grundversorgung mit den im Alltag benötigten Gütern und Dienstleistungen sowie Zugang zu Rückzugsorten wie Seeufer oder Wälder, sind für die Lebensqualität von grosser Bedeutung. Die Berechnung der Erreichbarkeit zu diesen Dienstleistungen ist eine Methode um dieses Phänomen zu messen. Die Erreichbarkeit wird durch die auf dem Strassennetz zurückgelegte Distanz zwischen dem Wohnort und dem Standort des nächstgelegenen Dienstleisters, respektive des nächstgelegenen Rückzugsorts, operationalisiert.

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