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

broering@52north.org

Project website: http://52north.org/arcgisServerSOS