ThinSWEClient - Visualising time series data with open source components.

52°North Thin SWE ClientVisualising Time Series Data withOpen Source ComponentsSimon Jirka & Arne Bröring(52° North)FOSS4G 2011, Denver

Project Overview• Web-based client for displaying time series sensor data• Based on OGC Sensor Web standards• Funded by: 1. EO2HEAVEN: EC FP-7 project investigating relationships between health and environment 2. German Federal Waterways Engineering and Research Institute: Large operator of hydrological measurement stations FOSS4G 2011

Intro: Sensor Web• World Wide Web is for websites – HTTP – HTML – ...• Sensor Web is for sensors – O&M – SOS – SPS – ... FOSS4G 2011

Sensor Web Enablement (SWE) – http://www.ogcnetwork.net/swe• Web Service interfaces & data encodings• Used to build a Sensor Web• Integration of (geo)sensors on application level FOSS4G 2011

SWE Functionality FOSS4G 2011

Observation & MeasurementsObserved Property := “Wind_Speed“ Phenomenon Time Result Feature of Interest 23 m/s 16.9.2010 13:45 uom Procedure (ID := “DAVIS_123“) Observation FOSS4G 2011

Sensor Observation Service GetCapabilities RegisterSensor SensorML DescribeSensorObservations & InsertObservationMeasurements GetObservation GML GetFeatureOfInterest FOSS4G 2011

Aims of the Thin SWE Client Development• Web-based client• Visualising time series data• Compliant to OGC O&M• Data loading from multiple SOS instances• Re-use of existing Open Source components• No Adobe Flash ! FOSS4G 2011

Application Domains• Hydrology – PEGELONLINE – OGC Surface Water IE• Air quality – EO2HEAVEN• Weather data – Wupperverband FOSS4G 2011

Functional Requirements• Diagram view – Combine multiple time series – Time series navigation (zoom, pan, first value, last value) – Overview time series for easier navigation• Map display  show sensor locations• Data export – CSV, XLS files containing observation data – PDF showing the current view FOSS4G 2011

SOS-Client FOSS4G 2011

FOSS4G 2011

SOS-Client FOSS4G 2011

FOSS4G 2011

Re-used Server-side Software Packages FOSS4G 2011

Re-used Open Source Software• JFreeChart – Framework for generating diagrams – Offers a broad range of different diagram stlyes  http://www.jfree.org/jfreechart/• 52°North OX-Framework – Encapsulating the communication with SOS servers  http://52north.org/oxf FOSS4G 2011

Re-used Browser-side Software Packages FOSS4G 2011

Re-used Open Source Software• Google Web Toolkit – Used as general framework – Develop in Java – Create JavaScript – Re-use of core elements • Remote procedure calls (between browser and server component of the client) • Internationalisation • Browser independency  http://code.google.com/webtoolkit/ FOSS4G 2011

Re-used Open Source Software• SmartGWT smartgwt – Based on GWT – User interface framework – Large widget library  http://code.google.com/p/smartgwt/ FOSS4G 2011

Re-used Open Source Software• OpenLayers OpenLayers – Map view showing the sensor locations – Extension of the menu for selecting new sensor data sets  http://openlayers.org/ – Integration with GWT:  http://gwt-openlayers.sourceforge.net FOSS4G 2011

Re-used Open Source Software• Gimv (Google Web Toolkit Image Viewer) – User interface components to interact with images (i.e., charts) – Provides functionality such as: • Navigation with a diagram view • Zooming • Tool tips • Overview images (used for an overview diagram) – No Adobe Flash!  Javascript  http://code.google.com/p/gimv/ FOSS4G 2011

Outlook1. Increase interoperability2. Usability enhancements3. Extension to SOS 2.0• Contributions (ideas, code, and tests with SOS instances) are welcome! FOSS4G 2011

Questions?Thank you!Arne Bröringbroering@52north.orghttp://52north.org/thinSWEclient FOSS4G 2011

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ThinSWEClient - Visualising time series data with open source components.

by Arne Broering on Sep 16, 2011

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ThinSWEClient - Visualising time series data with open source components. — Presentation Transcript