Sensor Observation Service Client for Android Mobile Phones

Sensor Observation Service Client for Android Mobile Phones Alain Tamayo, Pablo Viciano, Carlos Granell, Joaquín Huerta Geospatial Technologies Research Group, Universitat Jaume I, Spain SWE 2011, Oct 6-‐7

1 . Motivation The number of sensors deployed worldwide and the amount of data captured by them is growing at a fast pace. Hardware and software of mobile phones have had a rapid evolution making possible to users to access Web content anytime and anywhere. Sensor Observation Service Client for Android Mobile Phones 2

2 . Motivation The Sensor Observation Service (SOS) speciﬁcation provides a web service interface to retrieve sensor and observation data. Several clients for this speciﬁcation have been developed mostly for web and desktop environments, but not for mobile phones. Sensor Observation Service Client for Android Mobile Phones 3

3 . Goal Our goal is to develop a SOS client for the Android platform Linux-‐based OS developed by Google Android had 22.7% of the smartphones market share (February 22.7% Source: Gartner Inc.) It provides a Java API Plug-‐in for Eclipse IDE available Sensor Observation Service Client for Android Mobile Phones 4

4 . Application Requirements •  SOS client for Android versions 2.2 and above •  Support for the core proﬁle of SOS 1.0.0 (GetCapabilities, DescribeSensor, GetObservation) •  Visualisation of sensor locations and information •  Support for temporal and spatial ﬁlters •  Visualisation of observations in tables and charts •  Easy management of server information •  Connection to existing servers without the use of mediator components Sensor Observation Service Client for Android Mobile Phones 5

5 . Application Architecture Sensor Observation Service Client for Android Mobile Phones 6

6 . Data Access Layer •  Network communication Library •  Support for operations in the Core Proﬁle using HTTP Bindings •  XML Processing Code (Adapters) •  An adapter exists for every type of response •  Adapters are generated from the SOS schemas using an Instance-‐ based approach from a corpus gathered from 56 SOS servers Sensor Observation Service Client for Android Mobile Phones 7

7 . Instance-‐based Code Generation Sensor Observation Service Client for Android Mobile Phones 8

Dependencies of types in GML 3.1.1 9 Type Deﬁnition Hierarchy GML 3.1.1

8 . Business Logic Layer Sensor Observation Service Client for Android Mobile Phones 10

9 – UI Layer Google Maps Library is used for map visualisation: http://code.google.com/intl/es-‐ES/ android/add-‐ons/google-‐apis/maps-‐ overview.html Sensor Observation Service Client for Android Mobile Phones 11

10 – UI Layer (2) Sensor Observation Service Client for Android Mobile Phones 12

11 – UI Layer (3) aChartEngine is used to display charts: http://code.google.com/p/achartengine/ Sensor Observation Service Client for Android Mobile Phones 13

12 . Limitations •  Support only for observations encoded using ObservationType •  Observations must be encoded as swe:DataArray (52 North SOS, Deegree) •  Limited support for ﬁltering observations (TM_During, TM_Equals, BBOX) •  Only one table at a time can be displayed om:result deﬁned as xsd:anyType Sensor Observation Service Client for Android Mobile Phones 14

11 – Challenges and Open Issues •  Large size and complexity of the schemas diﬃcult development: XML data binding tools produces large binaries, producing this code manually is an error-‐prone and time-‐consuming task. •  Constraints related to display size limit the amount of information that can be shown to the user. •  SOS speciﬁcation is generic and open to extension •  Potentially large volume of data returned by SOS servers Sensor Observation Service Client for Android Mobile Phones 15

11 -‐ Conclusions •  We have implemented an Android client for the SOS specification that allows the visualisation of sensor locations and information, to visualise of observations in tables and charts, to filter observations according to temporal and spatial criteria and to easily manage the information about server end-‐points •  During the development of the application a group of challenges and open issues were found. We were able to partially tackle some of these problems, but their definitive solution remains open. Sensor Observation Service Client for Android Mobile Phones 16

12 – Licensed Content Some of the images included in this presentation has been obtained from Flickr. Details below: •  Slide 2: Cell phone evolution by sean dreilinger, •  Slide 2: Train Sensor "mass detector” by Frosted Peppercorn, •  Slide 2: Precipitation Sensor by ARM Climate Research Facility, •  Slide 2: NASAs Upper Atmosphere Research Satellite by NASA Goddard Photo and Video, •  Slides 2 and 4: android pixelpipe by osde8info, •  Slides 2 and 4: Samsung Galaxy S by yum9me, •  Slide 4: Android -‐ White Background by Saad Irfan, •  Slide 4: Samsung Galaxy Tab by 3 Sverige Sensor Observation Service Client for Android Mobile Phones 17

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