Abstract
Sensor data have broadened their scope recently, ranging now from the simple time series measurements to, e.g., hyperspectral satellite image maps timeseries. In addition to observed data, simulation data increasingly have to be merged, for example 4-D ocean and atmospheric data. The majority of these data fall into the category of multi-dimensional rasters. However, when it comes to flexible retrieval, including sensor data search, aggregation, analysis, fusion, etc., standard query language support in the past has not kept up with the service level of, e.g., metadata retrieval. To close this gap, the Open GeoSpatial Consortium (OGC) has issued the Web Coverage Processing Service (WCPS) Standard in December 2008. WCPS defines a request language for multi-dimensional raster data, suitable for specifying navigation, download, and analysis of sensor, image, and statistics data. This contribution emphasises sensor data modeling and the perspectives for an integrated, cross-dimensional sensor data retrieval. Further, the WCPS reference implementation is briefly discussed.
Highlights
Web Coverage Processing Service (WCPS) has emerged from the work on Web Coverage Service (WCS), it is formulated in a high-level manner and independent from particular Open GeoSpatial Consortium (OGC)
Following the functionality-driven presentation of the WCPS language, we focus on some real sensor data retrieval use cases available on the Web
The abundance of sensor data getting available calls for methods to structure the wealth of information that is becoming accessible
Summary
Sensor data contribute substantially to today's geo data mix. An ever-increasing number of instruments with a plethora of individual characteristics deliver data which needs to be received, actively polled, homogenized, stored, evaluated, and fed forward to human users for inspection and decision making or, via automated chaining, to tools for further analysis. December 2008 the tentatively simple raster data subsetting of WCS is complemented by the Web. Coverage Processing Service (WCPS) standard, which adds a coverage processing language for flexible ad-hoc navigation, extraction, and analysis of multi-dimensional raster data [5]. Image, and statistics data offered by some server can be addressed through requests of unlimited complexity, due to the language approach; for this reason WCPS has been dubbed "SQL for coverages". Findings presented stem from our active work in OGC, which includes advancing the WCS specification as co-chair of the respective working group, development of the WCPS specification, and architecting its reference implementation. The remainder of this contribution is organized as follows. A brief discussion of the protocol embeddings and the reference implementation is given
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