GeoServices REST API -...
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A lightweight Sensor Observation Service as an extension for the GeoServices REST API Arne Bröring, Satish Sankaran, Simon Jirka, Andreas Wytzisk INSPIRE, Istanbul, June 26th 2012 EEA
Transcript of GeoServices REST API -...
A lightweight
Sensor Observation Service
as an extension for the
GeoServices REST API
Arne Bröring, Satish Sankaran, Simon Jirka, Andreas Wytzisk
INSPIRE, Istanbul, June 26th 2012
EEA
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
http://www.eea.europa.eu/publications/general-brochure-2009/at_download/file
EEA‘s 32
member states
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
European Environment Agency
• Collection, coordination and dissemination of
environmental data and information
for Scientists, Decision Makers, Public
• EEA‘s Executive Director
Jacqueline McGlade
Keynote @ ESRI‘s UC 2011
� Pointed out the importance of
Sensor Data
& Need for easy accesshttp://video.esri.com/watch/472/keynote-jacqueline-mcglade
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
• Data themes:
Air quality, biodiversity, climate change, land use
European Environment Agency
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
EEA
Heterogeneous Interfaces:
- Proprietary formats
- FTP / HTTP
Problem
Data Providers
Application-specific
Interfaces
Data Consumers
ArcGIS Server based Infrastructure
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
Approach
• Infrastructure based on OGC’s Sensor Web Enablement
(SWE) and Sensor Observation Servive (SOS)
• Use these standards and combine with existing GIS
infrastructure
� Extension to existing system is required
[Extension to GeoServices REST API used by ArcGIS]
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
EEA
ArcGIS Server based Infrastructure
SOS Interface
Approach
Data Providers
Data Consumers
SOS Interface
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
1. Data model for near real-time observation data
– Aligned with Observations & Measurements 2.0
2. SOS REST interface for GeoServices REST API
– Aligned with Sensor Observation Service 2.0
– JSON encoding for observations / features / sensors
3. SOS 2.0 full compliance
Development Steps
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
Architecture Overview
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
Review: Geoservices REST API
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
SOS Extension for
Geoservices REST API
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
Example Deployment
• ~ 1,500 air quality stations (measuring O3, CO, K)
• > 1,000,000 observations for 30 days
http://www.eea.europa.eu/maps/ozone/resources/about-the-data
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
Example Requests
• SOS Starting Point:
http://ags.dev.52north.org:6080/arcgis/rest/services
/ObservationDB/MapServer/exts/SOSExtension [link] [link2]
• Observations Query: [link] [link2]
http://ags.dev.52north.org:6080/arcgis/rest/services
/ObservationDB/MapServer/exts/SOSExtension
/observations/query
?procedure=CO-SensorNetwork
&featureOfInterest=BETR701,DERP023,CH0049A
&temporalFilter=equals:2011-10-18T10:00:00+00:00
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
Observation Resource - Query
Parameter Detailsoffering List of identifiers
observedProperty List of identifiers
procedure List of identifiers
featureOfInterest List of identifiers
spatialFilter Example:spatialFilter=
{x:7.0,y:52.0,spatialReference:{wkid:4326}}
temporalFilter Example:temporalFilter=equals:2011-10-19T15:00:00+02:00
where Example:where=numeric_value<=35
f html | json
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
Observation Resource - JSON
{
"observationData": [
{
"id": "738",
"type": "OM_Measurement",
"phenomenonTime": "2011-10-19T23:00:00+02:00",
"resultTime": "2011-10-19T23:00:00+02:00",
"observedProperty": "CO",
"procedure": "CO-SensorNetwork",
"featureOfInterest": "BETR701",
"result": {
"type": "numerical",
"uom": "ug/m3",
"value": 18
}
}
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
OGC SOS 2.0 Compliance
• GetObservation Query:
http://ags.dev.52north.org:6080/arcgis/rest/services
/ObservationDB/MapServer/exts/SOSExtension
/GetObservation
?service=SOS
&version=2.0.0
&request=GetObservation
&procedure=CO-SensorNetwork
&spatialFilter=om:featureOfInterest/*/sams:shape,0.0,40.0,2.0,43.0,
urn:ogc:def:crs:EPSG::4326
&f=pjson
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
Conclusions
• We extended functionality of Geoservices REST API:
– Well-defined model for near real-time sensor data
– Provision of observations / features / sensor descriptions
– Explicit temporal filtering
– Server-side time zone support
– K
• We provided that functionality as:
– ArcGIS Server 10.1 and OGC GeoServices REST API extension
– Alignment with conceptual models of:
O&M 2.0, SOS 2.0, SensorML 2.0, SWE Lightweight Profile
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
Outlook
• Further extend the designed REST API for observations (e.g.
enable upload of observations)
• Formal specification of an SOS 2.0 / Geoservices REST
extension within OGC standardization process
• Complete implementation of a fully OGC SOS 2.0 compliant
ArcGIS Server Object Extension
52°North – Arne Bröring, INSPIRE, Istanbul, 26-06-2012
Questions?
Thank you!
Arne Bröring
Project website: http://52north.org/arcgisServerSOS
