1. GDI ISO Standards GovData Metadata
Download
Model
Metadata
Portal
GovData
Measurement
Simulation
INSPIRE
Data
GDI
Standards
Vikram Notay
Georg Carstens
Rainer Lehfeldt
A Metadata Standard for Hydroinformatic Data
EGU General Assembly 2017
Vienna, 27th April 2017

2. Hydroinformatics data and ISO Hydroinformatics data and GovData
Outline
Introduction
Goals
Hydroinformatics data and ISO
Hydroinformatics data and GovData
Summary
Ongoing/future steps
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

3. Hydroinformatics Data
Federal Waterways Engineering and Research Institute (BAW)
Consultant for the safe and efficient operation of the German waterways
Hydroinformatics data at the BAW considered during the current project phase
Field measurements
Laboratory measurements
Numerical simulations
Hundreds of simulations per project
Single result file can be >1 TiB
Goals… but first some information on numerical simulation models
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

4. Simulation Model
A representation of a physical process or thing that can be used to predict the process’s or thing’s behaviour or state
BAW Glossary
Source: BAW
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

5. Simulation Process Pre-processing Simulation Post-processing
Broadly divisible in three stages
Multiple iterations
Pre-processing
Simulation
Post-processing
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

6. Data Types: Examples Sources: WSV, BAW
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

7. Data Types: Examples (contd.)
Computational grid
Bathymetry
Initial conditions
Boundary conditions
Roughness coefficient(s)
Time-step size
Simulation period
Maps
Plots
Images
Movies …
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

8. Physical State Variables + Parameters
Ultimately, we are always working with physical state variables and parameters
Can be described using same metadata elements
Simulation
Files
Physical state variables
Parameters
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

9. Metadata for Physical State Variables + Parameters
Important metadata for physical state variables and parameters
Dimensionality (spatial)
Parameter name
Units
Value range
Water depth
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

10. Goals: Technical Uniform description of simulations
Complete description of simulations (more after goals)
Metadata about physical state variables
Cross-references to related datasets (files)
Conform to existing standards
ISO 19115
INSPIRE
GovData (Germany)
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

11. Goals: Usage Ability to answer user questions such as:
What was simulated?
What data was used?
Where are the files located?
What have teammates, predecessors, students already done?
Give me all simulations where
Geographic area is …
Flow conditions were …
Simulation period is before/after …
Scenario name is …
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

12. Goals: Visibility Geoportals GovData Open access and open data
Source: WSV
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

13. Metadata for Simulations
Spatial extents
Temporal extents
Data format
Simulation model
Input files / Simulation parameters
Name
Role in simulation
Units
Value range
Download link
Cross-reference to Metadata
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

14. Spatial Extents Lower Rhine Bounding polygon (341: EX_BoundingPolygon)
Bounding box (343: EX_GeographicBoundingBox)
Geographic Identifier (348: EX_GeographicDescription)
Lower Rhine
Source: BKG/BAW
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

15. Temporal Extents Extent (350: EX_TemporalExtent)
Subtree in ISO Representation
EX_Extent
geographicElement
EX_GeographicBoundingBox
EX_BoundingPolygon
EX_GeographicDescription
geographicIdentifier
temporalElement
extent
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

16. Data Format Resource Format (284: MD_Format)
Subtree in ISO Representation
MD_Identification
resourceFormat
MD_Format
name
version
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

17. Simulation Files / Parameters
No direct mapping in ISO 19115, but…
133: DQ_QuantitiativeResult provides similar elements
Role of file/parameter in simulation (134: valueType)
Units (135: valueUnit)
Range (137: value)
Download link and cross-reference implemented as XML-attributes
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

18. Simulation Files / Parameters (contd.)
Subtree in ISO representation
DQ_DataQuality
report
result Download link
DQ_Result
valueType Name
valueUnit Units
value Value range
lineage
LI_Lineage
source Cross-reference
LI_Source
description Role
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

19. Example with simulation parameters
<gmd:dataQualityInfo>
<gmd:report><gmd:QuantitativeAttributeAccuracy>
<gmd:result xlink:href=" <!-- Link -->
<gmd:DQ_QuantitativeResult>
<gmd:valueType>
<gco:RecordType>Discharge</gco:RecordType> <!-- Name -->
</gmd:valueType>
<gmd:valueUnit>
<gml:UnitDefinition id="discharge">
<gml:catalogSymbol>m3 s-1</gml:catalogSymbol> <!– units -->
</gml:UnitDefinition>
</gmd:valueUnit>
<gmd:value><gco:Record>78</gco:Record></gmd:value>
</gmd:DQ_QuantitativeResult>
</gmd:result>
</gmd:DQ_QuantitativeAttributeAccuracy></gmd:report>
<gmd:lineage><!-- Tags with role and cross-reference --></gmd:lineage>
</gmd:dataQualityInfo>
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

20. GovData Direct mapping of elements to ISO 19115, except Name
GovData categories
GovData Type (Dataset/Document/App)
Resource Format as MIME type
Licence ID
Contact (Role of contact => Author/Distributor)
Can also be automatically generated from ISO elements
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

21. Summary ISO-19115 metadata for simulation data possible
Appropriate ISO elements available for most simulation metadata
Remaining simulation metadata
Mappable to DQ_QuantitativeResults
mapping isn't always ideal, but
good compromise
Mapping to GovData possible
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

22. Ongoing and Future Steps
Set up Metadata Information System (MIS) of BAW
Develop tools for automatic generation of Simulation-Metadata
Integration of these tools in simulation workflow
Integration of MIS with a Web-Portal
Interfaces for publication in Geoportals, GovData portals, etc.
A Metadata Standard for Hydroinformatic Data Conforming to International Standards | V. Notay, G. Carstens, R. Lehfeldt

23. GDI ISO Standards GovData Metadata Portal Measurement INSPIRE Model
Download
Model
Metadata
Portal
GovData
Measurement
Simulation
INSPIRE
Data
GDI
Standards