This document describes the Geoss Service Factory (GSF), which automatically generates and publishes geospatial metadata from geographic data and web processing services in a standardized, publicly available format. The GSF includes factories that can view, download, discover, and transform content as well as a metadata generator. It uses existing APIs and instances of OGC services like WMS, WFS, WCS, and CSW. The metadata generator creates ISO 19139 metadata by connecting to these services, applying XSLT transformations, and updating a CSW client in around 18 seconds. The GSF closes the lifecycle of geospatial information by automating the publication of linked data and metadata to improve search and access.

1. Assisted Generation and Publication of
Geospatial Metadata
Sergi Trilles; Laura Díaz; José Gil;
Joaquín Huerta

2. Index
● Introduction
● Motivation
● Geoss Service Factory (GSF)
● Architecture
● Experimentation
● Conclusions

3. Introduction
• Starting from geographic
1 data…
• …Web Processing Service to
publish data and metadata
2 generated automatically …
• … standard and publicly
3 available.

4. Motivation
Share Discovery

5. GSF (Geoss Service Factory) (I)
• Acces • Share • Discovery • Act
• Visualize (Publish) • Access
• Download • Decide
• Processing

6. GSF (Geoss Service Factory) (II)
Geospatial Content
Models Metadata Data
Services
Discovery View Download Invocation Publication
Applications
Workflow Engine Application Logic Service Connector

7. GSF (Geoss Service Factory) (III)
Factories Existing
APIs instances
View
WMS WMS
WPS Interface Download
WFS WFS
Content Discovery
SPP
WCS WCS
Keywords
MD Generator CSW CSW
Transformation SOS SOS
Service

8. MD Generator IO Architecture
WMS URL
WFS URL
MD CSW
Generator URL
Keywords

9. MD Generator Execution Flow
Exixting
Factories APIs instances
View
WMS 3 WMS
WPS Interface
Discovery Download
7
Link WFS 3 WFS
6 Discovery
SPP
1 WCS WCS
Keywords MD
MD url Generator CSW 5 CSW
SPP
Transformation SOS SOS
Service

10. MD Generator Sequence Diagram
user MD Generator Geoserver instance XSLT CSW-T client
Request MDGenerator GetCapabilities
request to the WMS
service
Generate MD
Return MD
Update MD
Connect to CSW-T client
Return URL MD

11. Metadata structure
language Language
characterSet Coding
hierarchyLevel Hierarchical level of the referred data set
contact Responsible info
Metadata dateStamp Date of creation
ISO 19139 standardVersion Standard used
identificationInfo About the data: name, date, summary …
distribuciónInfo URL services
dataQuality Information relating to the standard

12. Experimentation (I)

13. Experimentation (II)

14. Experimentation (III)
● Time cost 18 seconds (Intel(R) Xeon(R) CPU 5160 @
3.00GHz, RAM Memory 16 GB DDR2 FB-DIMM
Synchronous 667 MHz)

15. Conclusions
 We close the life-cycle of geospatial
information with the publication step.
 Simple process to publish data and
metadata
 Improving search and access to
information since the metadata is linked
to the data

16. Thanks for your attention
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