Download services - INSPIRATION

INSPIRATION – Spatial Data Infrastructure in the Western Balkans
Download services
2nd INSPIRE Training - Zagreb, Croatia
25th - 26th September, 2012
Martin Koška, SAŽP
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Outlines
Legislation regarding INSPIRE download services
Implementation of INSPIRE download services
ATOM implementation
WFS implementation
Demonstration of WFS services - examples
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INSPIRE architecture
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General usage scenario of SDI
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INSPIRE legislation and guidelines
Directive 2007/2/EC of the European Parliament and of the
Council of 14 March 2007 establishing an Infrastructure for
Spatial Information in the European Community (INSPIRE)
[INS DIR]
Commission Regulation amending Regulation (EC) No
976/2009 as regards download services and transformation
service
Technical Guidance for the implementation of INSPIRE
Download Services published 12-06-2012, Version 3.0 (not
legally binding)
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Implementing Rule versus Technical
Guidance
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Standards regarding download services
ISO 19142:2010 Geographic information - Web Feature
Service, ISO 19142
ISO 19143:2010 Geographic information - Filter encoding, ISO
19143
IETF RFC 4287 The Atom Syndication Format, ATOM
GeoRSS-Simple The Simple Serialization of GeoRSS,
http://www.georss.org/simple GeoRSS
OpenSearch Description Document format,
http://www.opensearch.org/Specifications/OpenSearch/1.1 OpenSearch
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Related subjects
XML - Extensible Markup Language - is a markup language that defines a set of rules for encoding documents in
a format that is both human-readable and machine-readable. It is defined in the XML 1.0 Specification
produced by the W3C, and several other related specifications
XML is common interchange data format
XML uses easy syntax for structuring information (elements, atributes, processing instructions ...)
XML “X“ stands for extensible -> it means everybody can make new elements
XML SCHEMA - is formal language which allows user to define specific class of XML document
Helps to define structure of class of documents in terms of allowed elements their attributes, cardinality
of elements and their content.
Then it is possible to validate XML document against XML schema
GML - Geography Markup Language Encoding Standard - XML grammar defined by the Open Geospatial
Consortium (OGC) to express geographical features, which uses XML schemas as technology
GML application schemas (actually 3.2.1 in OGC specidication) - the basis for domain - or community-specific
"Application Schemas", which in turn support data interoperability within a community of interest.
All 34 INSPIRE datasets are represented by GML application schemas which extends basic GML
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What is download service
Chapter IV, Article 11 (Network services) of the Directive define
download service as:
“Download services enabling copies of complete spatial datasets,
or of parts of such sets, to be downloaded.”
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When is implementation required
Article 4: Not later than 28 June 2012, Member States shall
provide the Download Services with initial operating
capability.
Article 4: Not later than 28 December 2012, Member States
shall provide the Download Services in conformity with this
Regulation.
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Non-Interoperable and Interoperable
Download Services
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Legal Requirements
ANNEX I - QUALITY OF SERVICE
For the Get Download Service Metadata operation, the response time for sending the initial
response shall be maximum 10 seconds in normal situation.
For the Get Spatial Data Set operation and for the Get Spatial Object operation, and for a
query consisting exclusively of a bounding box, the response time for sending the initial
response shall be maximum 30 seconds in normal situation then, and still in normal situation,
the download service shall maintain a sustained response greater than 0,5 Megabytes per
second or greater than 500 Spatial Objects per second.
For the Describe Spatial Data Set operation and for the Describe Spatial Object Type
operation, the response time for sending the initial response shall be maximum 10 seconds in
normal situation then, and still in normal situation, the download service shall maintain a
sustained response greater than 0,5 Megabytes per second or greater than 500 descriptions
of Spatial Objects per second.
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Legal Requirements
ANNEX I - CAPACITY
The minimum number of simultaneous requests to a download service to be served in
accordance with the quality of service performance criteria shall be 10 requests per second.
The number of requests processed in parallel may be limited to 50.
ANNEX I – AVAILABILITY
The probability of a network service to be available shall be 99 % of the time.
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Mandatory Operations
ANNEX IV - Download Operations
All download services
Get Download Service Metadata - Provides all necessary information about the service, the available
Spatial Data Sets, and describes the service capabilities.
Get Spatial Data Set - The Get Spatial Data Set operation allows the retrieval of a Spatial Data Set.
Describe Spatial Data Set - This operation returns the description of all the types of Spatial Objects
contained in the Spatial Data Set.
Link Download Service - Allows the declaration, by a Public Authority or a Third Party, of the availability of
a Download Service for downloading Spatial Data Sets or, where practicable, Spatial Objects, through the
Member State’s Download Service while maintaining the downloading capability at the Public Authority or
the Third Party location.
Direct access
Get Spatial Object - This operation allows the retrieval of Spatial Objects based upon a query.
Describe Spatial Object Type - This operation returns the description of the specified Spatial Objects
types.
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Types of INSPIRE Download Service
Pre-Defined Download Service
One or more files representing either the full dataset or subsets
These files are accessed via a file or data repository (e.g. FTP)
Downloaded in their entirety and the content cannot be changed (i.e. encoding, CRS)
Direct Access Download Service
Users define a set of request criteria that subsets the data to return only the features needed:
Select all data within a bounding box
Select only feature type arbitrary
Select feature by identifier
Select all features using temporal criteria within and area of interest
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Implementing INSPIRE Download
Services
Possible ways for implementation of INSPIRE Download Services
Atom-based implementation - The Atom syndication format provides a simple, widely understood
mechanism for publishing information on the web in the form of feeds in a way that is compatible with
existing web architecture and many tools.
WFS-based implementation - The OGC Web Feature Service allows a client to retrieve and update
geospatial data encoded in Geography Markup Language (GML)* from multiple Web Feature Services.
WFS provides much more sophisticated web service for downloading and directly access data online. WFS
supports the ability for users to retrieve only the data they are interested in.
*geospatial data can be encoded in different formats
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Options for implementing INSPIRE
Download Services
3 options for implementing INSPIRE Download Services (in present):
1. ATOM Feed providing access to pre-defined datasets
2. OGC WFS 2.0 serving pre-defined datasets
3. OGC WFS 2.0 serving features (Direct Access)
Conformance Class
Atom Feed
Pre-defined WFS
Direct access WFS
Quality of service
Obligation
C
(M, if WFS (Predefined) is not
conformed to)
C
(M, if Atom Feed is not
conformed to)
O
M
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Introduction to ATOM
XML based web content and metadata syndication format (similar as RSS)
Application-level protocol for publishing and editing web resources belonging to periodically updated
websites
ATOM feeds push links to updated content to subscribed users
Removes need for user to repeatedly return to source to check for updates
Minimal implementation cost and complexity
ATOM Feed readers
Web Browser (e.g. Firefox, Opera, IE, Safari, Chrome)
Web-based feed reader (e.g. Google Reader)
Desktop feed reader (e.g. MS Outlook)
ATOM feed contains:
Descriptive metadata describing the feed itself
One or more entries that describes the content (i.e. pre-defined dataset)
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Example of atom feed
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Atom feeds to make available pre-defined datasets for
INSPIRE download services
A single Atom feed is published as a top-level “Download Service Feed”.
This feed contains a link to an OpenSearch description document which provides operations metadata for
the Download Service. The OpenSearch description document provides information about the operations
implemented by the download service.
This feed contains one or more Atom entries: one per pre-defined data set.
Each of these Atom entries shall contain a link to another Atom Feed (a “Dataset Feed”) that
describes the particular pre-defined data set.
Each of these “Dataset Feeds” shall contain Atom Entries with links to download the predefined dataset in
different formats (e.g. in GML, ShapeFile etc) and in different Coordinate Reference Systems. One link shall
be provided for each format/CRS combination.
Feeds may be provided in multiple languages
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Overview of Atom feed structures
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Elements required to describe feed and
entries
Feed
Title
ID
Author
Update
Rights
Subtitle, GeoRSS polygon (Dataset Feed)
Links to related metadata and content:
INSPIRE ISO Metadata
OpenSearch Description
Spatial object description
Self Referencing Link
Optional link to alternate representations of feed
Entries
Title
ID
Update
Category (CRS)
Link(s) to Content
URL for Dataset Feed (Top Feed)
URL for Dataset (Dataset Feed)
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WFS implementation of download
services
The Web Feature Service (WFS) represents a change in the way geographic information is created,
modified and exchanged on the Internet. Rather than sharing geographic information at the file level using
File Transfer Protocol (FTP), for example, the WFS offers direct access to geographic information at the
feature and feature property level. Web feature services allow clients to only retrieve or modify the data
they are seeking, rather than retrieving a file that contains the data they are seeking and possibly much
more. That data can then be used for a wide variety of purposes, including purposes other than their
producers' intended ones.
In the taxonomy of services defined in ISO 19119, the WFS is primarily a feature access service but also
includes elements of a feature type service, a coordinate conversion/transformation service and
geographic format conversion service
OpenGIS Web Feature Service 2.0 Interface Standard equals ISO 19142
Other standards – WFS 1.0.0, WFS 1.1.0
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Main operations
GetCapabilities (discovery operation)
DescribeFeatureType (discovery operation)
GetPropertyValue (query operation)
GetFeature (query operation)
GetFeatureWithLock (query & locking operation)
LockFeature (locking operation)
Transaction (transaction operation)
CreateStoredQuery (stored query operation)
DropStoredQuery (stored query operation)
ListStoredQueries (stored query operation)
DescribeStoredQueries (stored query operation)
New in WFS 2.0.0 used by INSPIRE
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GetCapabilities operation
The GetCapabilities operation generates a service metadata document
describing a WFS service provided by a server.
Parameters
ServiceType = "WFS"
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DescribeFeatureType operation
The DescribeFeatureType operation returns a schema description of feature
types offered by a WFS instance.
Parameters
service :"WFS"
version : "2.0.0“
typeName - A comma separated list of feature types to describe. If no
value is specified, then all feature types are returned.
outputFormat : "text/xml; subtype=gml/3.2"
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GetFeature operation
The GetFeature operation returns a selection of features from a data store. A
WFS processes a GetFeature request and returns a response document to
the client that contains zero or more feature instances that satisfy the
query expressions specified in the request.
Parameters
service :"WFS"
version : "2.0.0“
Typename - A list of feature type names to query
Output format - The output format used to describe feature data returned by WFS
Result type
Maxfeatures
Filter - A filter specification describes a set of features to operate upon. The filter is defined
as specified in the OGC Filter Encoding Specification
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Mapping to WFS requests
Get Download Service Metadata - GetCapabilities
Get Spatial Data Set - GetFeature
Describe Spatial Data Set - DescribeFeatureType
Link Download Service - PublishMetadata function of an INSPIRE compliant discovery service
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Mapping INSPIRE download service requests
to WFS requests – predefined datasets
Mapping to WFS requests
Get Download Service Metadata – GetCapabilities - The Get Download Service Metadata request is a
GetCapabilities request to the WFS indicated in the metadata record
Get Spatial Data Set – GetFeature - ISO 19142 describes the operations ListStoredQueries and
DescribeStoredQueries. The former is used to retrieve a list of stored queries that are available and the
later is used to request more information about a particular stored query (or queries) such as the
parameter arguments that are required to make a GetFeature request using the stored query
Describe Spatial Data Set - DescribeFeatureType
Link Download Service - PublishMetadata function of an INSPIRE compliant discovery service
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Mapping INSPIRE download service requests
to WFS requests – direct access
Mapping to WFS requests
Get Download Service Metadata - GetCapabilities
Get Spatial Data Set - GetFeature
Describe Spatial Data Set - DescribeFeatureType
Link Download Service - PublishMetadata function of an INSPIRE compliant discovery service
Get Spatial Object - GetFeature request with required query arguments is made to the WFS
Describe Spatial Object Type – GetCapabilities - The WFS responds with the XML schema for the
requested Spatial Object types
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Examples of requests-responses from
WFS server
Geoserver – open source software providing several kind of services also WFS service
In present time provide data also in GML format using interface WFS 1.0.0, WFS 1.1.0
Link:
• http://geoserver.org
• Scenario: how to serve district borders layer using WFS (download) service and make it
permanently actual
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Examples of using WFS service
Biodiversity web application SK, BG, AT
INSPIRE mashup application which provides:
- Filtering the features
- Download features
- Weaving (portrayal) the features
- Possibility to supplement the application by other data from other countries
Components:
Database and data
Link:
• http://geo.enviroportal.sk/geoserver/www/ps_mashup/index.html
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Thank you.
http://geoportal.sazp.sk
http://geo.enviroportal.sk
http://inspire.gov.sk
http://www.enviroportal.sk
http://www.sazp.sk
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