The target of the Open Geospatial Consortium (OGC) is interoperability of
geographic information, which means creating opportunities to access geodata in a
consistent, standardized way. In the domain of sensor data, the target will be picked up
within the OGC Sensor Web Enablement Initiative and especially reached through the
Sensor Observation Service (SOS) standard. This one defines a service for a standardized
access to time series data and is usually used for in situ sensors (like discharge gauges and
climate stations). Although the standard considers raster data, no implementation of the
standard for raster data exists presently. In this paper an OGC-compliant Sensor
Observation Service for a standardized access to raster data is described. A data model was
developed that enables effective storage of the raster data with the corresponding metadata
in a database, reading this data in an efficient way, and encoding it with result formats that
the SOS-standard provides.