OPEN·SENSOR·WEB has extensive functions for searching, visualizing and analyzing environmental data. The following functions are available.


The data in OPEN·SENSOR·WEB can be searched and filtered based on various aspects.

Topic allows the selection of sensors according to predefined topics and phenomena.

Using the Filter, sensors can be filtered by different keywords or dates, e.g. "DWD" or "since 2020-01-01".

Filters can also be applied to specific topics, so filters of the facet "Topic" can be combined with keywords of the facet "Filter", e.g. Air Temperature and DWD.

The facet Values has experimental status. It allows the display of spatially distributed single values at indivisible time intervals on the map. Currently only selected phenomena are supported, e.g. temperature and precipitation.

Visualization & Analysis

OPEN·SENSOR·WEB allows full access to the entire time series - sometimes spanning several decades or even centuries. Our slippy-chart technology allows high-performance and interactive work with the data. Even long time series with hundreds of thousands or millions of data points can be loaded and visualized quickly.

Individual sensors can be selected via the map and displayed in their own chart.

  • First select the desired location on the map and then chose "Add Sensors" in the pop-up window.
  • You can display the data chart using the "show charts" function. The last selected sensor is appended the end of the charts tab. For many selected sensors you have to scroll a little.

The time series chart provides the following functions.

Function / Button Description
Axis scaling (Pen-Icon) The vertical axis is automatically adjusted to the global min/max values of each time series. If you choose "Manual" these settings can be modified according to your preferences.
Chart type (Chart-Icon) It is possible to select between different chart types, e.g. line and bar charts.
Interpolator Time series occasionally have gaps. You can choose which interpolation method is to be used for thse data gaps. Available methods are linear, constant or nearest value.
Aggregation method Mean or sum values can be displayed. Normally the default setting fits.
Temporal resolution Here you can select the time resolution of the measured values for the display. Without manual intervention, this is automatically calculated and taken into account. It must currently be specified in the ISO notation.

An overview chart gives an overview of all selected time series. The overview diagram allows in particular the selection of time periods and serves the fast navigation over large time periods.

In the top menu further functions are offered, which refer to all displayed time series.

  • Download the data of all selected sensors
  • Toggle the overview chart on and off
  • Refresh data and charts
  • Display all charts side by side in fullscreen mode, hiding the map


The data can be downloaded either individually per sensor (icon directly on the chart) or for all selected sensors (icon above the display next to the time period).

Field Description
Resolution Temporal resolution of the measurement series, currently specified in ISO notation. The measurement series can be requested for example in raw, which corresponds to the raw data. Then it can be requested aggregated for example to 15 minutes (PT15M), hourly (PT1H) or daily (P1D).
Time Extent Period for which the time series is downloaded. "Chart" uses the time period that is currently displayed in the chart. "Full" means the entire period of time covered by the time series.
Format Format in which the data is downloaded. You can choose between CSV or JSON.
Columns For aggregated values there are also the columns "Min/Max" and "Coverage". "Min/Max" indicates the fluctuation range of the measured values within a time slice; "Coverage" indicates the coverage of measured values. A coverage of 0.9 means that measured values are only available for 90% of the time slice. The rest are data gaps. For certain analyses this can be an important information.
Aggregation Here you can select the aggregation method for measured values. Available options are "Mean" and "Sum".