Which INSPIRE download service to implement? Michael Lutz, Alexander Kotsev TG Data meeting 12-13 February 2018

Principles Data should be collected only once Possible to combine seamless data from different sources GI for good governance at all levels should be readily and transparently available Focus on information relevant for governance GI should be easily discoverable, together with its metadata Distributed Service Oriented Architecture (SOA)

Types of network services

Download services Two types of services „… services, enabling copies of spatial data sets, or parts of such sets, to be downloaded and, where practicable, accessed directly“ Article 11 (2007/2/EC) Two types of services Predefined (download and describe whole datasets) Direct access (describe and access to spatial objects through query) Operations (Request/Response) are described in the INSPIRE Network Service regulation

Service implementation Multiple options Service implementation Predefined dataset Direct access SOS X WFS Х WCS Atom  

ATOM Based on Advantages Disadvantages IETF RFC 4287 The Atom Syndication Format OpenSearch Description Document format Advantages Very easy to implement Full example available in TG Works with standard web servers Disadvantages No support for direct access operations Large datasets might need to be split

Web Feature Service Technical Guidance based on WFS 2.0 Exposes complex GML Advantages Well supported by multiple server and client implementations Support for interaction with datasets (queries) Disadvantages Many implementation options Size of response might be problematic Alternative encodings to be available in WFS 3.0

Web Coverage Service Technical Guidance based on WCS 2.0 Suitable for multi-dimensional coverage data Typical examples 1-D temperature (time series or vertical profile) 2-D elevation, precipitation, imagery, x/y/t image timeseries and x/y/z geophysical voxel data 4-D x/y/z/t weather data. Advantages Powerful operations for ‘trimming’ and ‘slicing’ Support for heterogeneous coverage structures Disadvantages No backwards compatibility between WCS 2.0 is not (yet) widely supported Limited (still) client support

Sensor Observation Service Technical Guidance based on SOS 2.0 and O&M Suitable spatio-temporal data from sensors Several specialized observation types are defined Advantages Serve spatio-temporal data Support for specialized observation types Disadvantages Definition of a dataset? Huge responses

Any questions? You can find us at michael.lutz@ec.europa.eu and alexander.kotsev@ec.europa.eu