Konferenzbeitrag
Geospatial Service Interfaces and Encodings for Mobile Applications
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Datum
2012
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Shaker Verlag
Zusammenfassung
Sensor Web Enablement suite (OGC SWE) offers a set of standardized service interfaces and data models which can
be used for encapsulation of arbitrary observation-generating processes. In the past, AIT has used the OGC SWE for
wrapping of hardware sensors, sensor data stores, cadastres and various sensor-like models behind OGC Sensor Observation Service (for data access) and Sensor Planning Service (for process control) interfaces. This approach was
successfully applied in different projects (SANY, SUDPLAN), and resulted in development of the SOS and SPS service interfaces for the set of open source tools for time-series handling (ts-toolbox.ait.ac.at) developed by AIT. We
have also discovered several issues and limitations of the OGC SWE services: (1) encoding of observations in SensorML/SWE Common is not always straightforward; (2) XML encoding/decoding can become extremely inefficient
for large data sets; and (3) the complexity of the OGC XML schemas (O&M, SWE common, GML) further slows
down the SWE-based solutions. However, these issues appeared of secondary importance compared to benefits of
interoperability for classic environmental applications where both server and the client had plenty of memory and
CPU power, the observations and processes creating them are well-defined and do not often change, and the interoperability across different organizations is a must. Recently, our focus moved towards Volunteered Geographic Information, and the rules of the game changed, with (potential) numbers and profiles of users and “sensors” drastically
rising, and smartphones replacing the classical PCs as key client platform. This resulted in development of a Mobile
Data Acquisition Framework (MDAF) which will be described in this paper.