LSIR Developments for SiwssEx Hoyoung Jeung EPFL-LSIR SwissEx Annual Meeting, Zurich 15 th July

System Overview captured queried processed

Distributed Metadata Join  Interactive processing + real-time sensor  Used for PermaSense –dealing with sensor redeployment problems

Automatic Metadata Generation  Dynamic metadata composition by GSN –Possibility of user-given operation for the trigger in GSN –Automatic metadata page creation at SwissEx wiki EPFL multidata temperature T14:00:41 1.0

User-Interactive Data Cleaning  Model-based anomaly detection –User can select model/parameters original data stream ↓ approximation using user-selected models ↓ detecting anomalies ↓ user confirmation: anomaly is an actual error?

Advanced Metadata Search  Provides a rich set of search conditions –Multiple-property, geographical search  Supports various visualization –e.g., bar, pie, graph, and map –aggregation of query results –search results export -> XML/CSV

Dealing with Evolving DB Schema  Problem –tables managed by different versions of GSN, multiple tables, conflicts, ov erlaps, errors  Used for PermaSense  Input –list of tables representing mappings –old schema  Output –unified schema –synchronization mechanism

Spatial Query Support  Problem (posed by Hydrosys) –Possibility to query stations based on spatial predicates  Solution 1 –Extend GSN with GIS toolkit –Create new web method (/geodata) Parameters: query, envelope [,union] –Allows basic queries (e.g. average wind speed in a given area at a time)  Solution 2 –Use Postgres/PostGIS –More flexibility for arbitrary queries –Add automatic index –Adapt web methods

Simulation Support  Web service for meteoIO  Integration with GeoTop  Web access (front-end) to simulation –Filtering, interpolations, …  Used for Hydrosys

Access Control of GSN  The prevention of unauthorized use of data  Authentication –User authentication by password –GSN server authentication by using SSL/TLS protocol User Access Virtual Sensor U rw vs1 U wvs3 U ownvs1 U rvs2

Various Technical Support  Install, configuration, patches –SLF, Hydrosys, APUNCH, Remote Sensing EPFL, ….  Maintenance and training  Supporting integration of new data sources  Continuous development of SwissEx wiki –Collaboration with SLF  Securing data: repository for Sensorscope –Reloading all historical data –Mirroring data

Planned Work  Major goal –Make the developments in real use –Continuing technical support  Hydrosys –Spatial queries with PostGIS Adapt web methods, testing and documentation  SLF –Migrate IMIS –Mirroring of data (waiting for hardware)  LTE –Adapt web methods for fetching grid data