1 global runoff data centre (grdc) at the german federal institute of hydrology (bfg), march 2013 1...

Global Runoff Data Centre (GRDC) at the German Federal Institute of Hydrology (BfG), March 2013 Global Runoff Data Centre (GRDC) at the German Federal Institute of Hydrology (BfG), March 2013 1

1st, Task Team on WIGOS MetaData (TT-WMD)WMO Headquarters in Geneva, Switzerland from 11 to 15 March 2012

REQUIREMENTS FOR OBSERVATIONAL METADATA

from the perspective of the Commission for Hydrology – CHy

submitted by the Global Runoff Data Centre(Irina Dornblut, Ulrich Looser)


Information about the dataset:– identificationInfo: citation, abstract, language, topicCategory

– extent: bounding box/polygon, vertical extent, temporal extent

– resourceConstraints: useLimitations, access-/useConstraints

– descriptiveKeywords: keyword, type, thesaurusName

as defined within the WMO Core Metadata 1.3 (July 2012)

Additional information is required with respect to time series– identify time series (representation information)

– describe time series as temporal coverages (WML2)

– identify time series as result of observation (content information)

– describe hydrologic variable, monitoring point, observation process (observation details)

WIS Discovery Metadata provide


WIGOS Discovery Metadata provide

Details about the observation whose result is the dataset: - hydrologic object under observation

- hydrologic variable observed

- monitoring station / platform used

- instrument / sensor or algorithm applied

Assure thematic accuracy of data compiled in the dataset

Should use common concepts as far as suitable- sampling-/sampledFeature, observedProperty and procedure

(ISO19156) as implemented within WML2.0 Part 1: Time series (OGC10-126r3)

- HY_Features concepts (documented in OGC 11-039r2, under review)


Compilations / collections of hydrologic data

each value at a position in time different from that of the others

time series of ordered time-value pairs

(provided in WaterML2.0 Part1: Time Series)

each value at a position in space different from that of the others

coverages of points, lines or polygons (vector data)

regular-grid files (raster data), e.g. square-grids

(concepts provided within ISO 19123:Coverage geometry …)

Hydrologic Datasets


describe real-world properties of a hydrologic object• water: physical, chemical, biological properties, …

• water body: water level, discharge, volume of recharge, …

• containing unit: conveyance, conductivity, porosity, …

result from observation, or its simulation• using a sampling feature as proxy: observing station,

gauging site, observation well, water sample, etc

• applying a suitable procedure:

sensor, calculation process, rating, model, etc

Hydrologic Datasets


refer to objects which represent units of shared interest wherein the hydrologic processes take place, …

• Unit of study across scientific disciplines and sub-disciplines, addressed in inter-disciplinary programs, inter-program collaboration and cross-domain research projects

• Unit of management across administrative jurisdictions, addressed by Integrated Water Ressources Management

• Unit of monitoring and reporting crossing political boundaries, addressed in reporting systems, information and data portals

Hydrologic Datasets


Hydrologic ProcessStreamflowGroundwater flowWater use

hostingUnit::Basin


hostingUnit::Basin

Hydrologic Datasets –Time-Series Example

ContentInformation::CoverageDescription::RangeDimension

(WML2)TimeseriesMetadata



(WML2)Monitoring Point

sampledFeature::HydroFeaturehostedProcedure: …Process



(WML2)TimeseriesObservation

featureOfInterest::MonitoringPointprocedure::ObservationProcessobservedProperty::Any_Property



Series of time-value pairs

Series of time-value pairs

using a monitoring point on a river and applying a process

using a monitoring point on a river and applying a process

(WML2)ObservationProcessInstrument, Sensor / Calculation

platform:: MonitoringPointconstrainedProperty::anyVariable



Catchment / Basin:(reporting region)

containingBasin:: BasincontainingSystem:: BasinHierarchy



Result from measurementResult from

measurement

Measurement

Monitoring Monitoring PointPoint

ObservatioObservation Processn Process

Hydrologic Variable: Q

Streamflow

RiverRiver

Basin

representing the basin where the flow process takes place

representing the basin where the flow process takes place

describe a hydrologic variable of the river

describe a hydrologic variable of the river

WaterBody, spec. River

representedCatchment::BasinrepresentedProcess::hy..Procss



ContentInformation::CoverageDescription.type: PhysicalMeasurement(Observation result)ModelResult (Simulation)

...Attribute. name: observableProperty: e.g. Dischargedescription:TimeValuePair



observableProperty::hydrol…Variable

carrierOfCharacteristics:: River / HydrologicProcessconstrainedBy::[anyConstraint]Algorithm / Configuration / Location Material / Organism / Substance



SpatialRepresentationInfo::(applied to Time domain)

TimeSeries


TimeSeries Q


Hydrological study in the Niger River Basin: For a streamflow study in the Niger river basin, time series of daily discharge data, between

1981 and 2010, longer then 15 years, at stations on the rivers in the Niger river basin are requested. As far as available information should be provided about missing values.

• find extent and temporal resolution of time series, e.g. 1981-2010, 15, daily, …

• f... missing value information of the time series, e.g. percentage of missing values.

• f... the hydrologic variable of which time series are avaiable, e.g. discharge.

• f... the hydrologic process characterised by the variable, e.g. streamflow.

• f... the river characterised by the variable, e.g. Benue river.

• f... the basin represented by the Benue river, e.g. Niger basin.

A list, and a map, of all stations in the Niger river basin should be provided comprising the available time series of daily data between 1981 and 2010 with a minimum length of 15 years which enables the user to identify a station of interest and select the time series by percentage of missing values.

Discovery of hydrologic datasets, useCase 1



ContentInformation::CoverageDescription::…












ContentInformation::CoverageDescription.type: PhysicalMeasurement ModelResult

... attribute. name: observableProperty: e.g. Dischargedescription:TimeValuePair




















TimeSeries


TimeSeries

… of measured DISCHARGE, Q, characterising the RIVER, or the STREAMFLOW, representing the BASIN

ISO/WMO 19115

ISO/WMO 19115

ISO19156 / OGC10-126r3 (WML2)

ISO19156 / OGC10-126r3 (WML2)

GRDC Metadata (Draft)

OGC11-039r2 (HY_Features) discussion paper


find time-value pairs …


hostingUnit::Basin


hostingUnit::Basin


Time series collected by a data centre: A regional data center collect time series of daily data from decentralised stations whose data

are provided in automated way. As far as available information should be provided how the data values are aggregated and about the instrument or method used for the value determination.

• find extent and temporal resolution of time series, e.g. daily

• f... options to transfer time series, e.g. semi-automated transfer, protocols, …

• f... aggregated data value compiled in the time series, e.g. aggregation interval.

• f... the hydrologic variable of which time series are available, e.g. discharge.

• f... determination of discharge values, e.g. ADCP, float gauge, rating.

• f... the station for which discharge data are available, e.g. 26900400 (Cochem).

• f... the river on which 26900400 is located, e.g. Moselle.

• f... the basin represented by the Moselle river, e.g. Rhine basin.

A list, and a map, of all stations in the Rhine basin should be provided comprising the available time series of daily data which enables the collecting data center to identify a station of interest by data transfer mode, and select the time series by data aggregation and the value determination.



Discovery of hydrologic datasets, useCase 2a









(WML2)ObservationProcessInstrument,Sensor / Calculation


(WML2)ObservationProcessInstrument,Sensor / Calculation






ISO/WMO 19115

ISO/WMO 19115

ISO19156 / OGC10-126r3 (WML2)

ISO19156 / OGC10-126r3 (WML2)

GRDC Metadata (Draft)GRDC Metadata

(Draft)



… of Q, measured using a specific PROCESS at MONITORING POINT on the RIVER, representing the BASIN



hostingUnit::Basin


hostingUnit::Basin


hostingUnit::Basin


hostingUnit::Basin


















TimeSeries


TimeSeries


Discovery of hydrologic datasets, useCase 2b









(WML2)ObservationProcessInstrument, Sensor/ Calculation








ISO/WMO 19115

ISO/WMO 19115

ISO19156 / OGC10-126r3 (WML2)

ISO19156 / OGC10-126r3 (WML2)


(Draft)



… of Q, measured using the MONITORING POINT, sampling the RIVER, representing the BASIN



hostingUnit::Basin


hostingUnit::Basin


hostingUnit::Basin


hostingUnit::Basin


















TimeSeries


TimeSeries












platform:: MonitoringPointconstrainedProperty::anyVrble







ISO/WMO 19115

ISO/WMO 19115

ISO19156 / OGC10-126r3 (WML2)

ISO19156 / OGC10-126r3 (WML2)


(Draft)



… at a MONITORING POINT, using a specific PROCESS, observing Q of the RIVER, representing the BASIN



hostingUnit::Basin


hostingUnit::Basin


hostingUnit::Basin


hostingUnit::Basin


















TimeSeries


TimeSeries



















ISO/WMO 19115

ISO/WMO 19115

ISO19156 / OGC10-126r3 (WML2)

ISO19156 / OGC10-126r3 (WML2)




(Draft)

… using a specific PROCESS, observing Q, characterising the RIVER / STREAMFLOW, representing the BASIN



hostingUnit::Basin


hostingUnit::Basin


hostingUnit::Basin


hostingUnit::Basin


















TimeSeries


TimeSeries























ISO/WMO 19115

ISO/WMO 19115

ISO19156 / OGC10-126r3 (WML2)

ISO19156 / OGC10-126r3 (WML2)


(Draft)



… of measured Q, characterising the RIVER, representing the STREAMFLOW in the BASIN



hostingUnit::Basin


hostingUnit::Basin










TimeSeries


TimeSeries























ISO/WMO 19115

ISO/WMO 19115

ISO19156 / OGC10-126r3 (WML2)

ISO19156 / OGC10-126r3 (WML2)


(Draft)




… at a MONITORING POINT, sampling the RIVER, representing the BASIN


hostingUnit::Basin


hostingUnit::Basin





Q














TimeSeries


TimeSeries












hostingUnit::Basin


hostingUnit::Basin









ISO/WMO 19115

ISO/WMO 19115

ISO19156 / OGC10-126r3 (WML2)

ISO19156 / OGC10-126r3 (WML2)


(Draft)




… resulting from a specific PROCESS at a MONITORING POINT on the RIVER, representing the BASIN


















TimeSeries


TimeSeries


Requirements for WIGOS metadata from the perspective of the Commission for Hydrology, CHy

References:

GRDC (2012): Hydrologic Information – Metadata: a semantic structure for the description of hydrologic data (GRDC Hydrologic Metadata). Summary prepared for the 14th session of WMO CHy. Koblenz, 2012.

GRDC (2013): Hydrologic Information – Metadata: a semantic structure for the description of hydrologic data (GRDC Hydrologic Metadata). – in preparation (June 2013).

ISO (2012): Geographic information -- Metadata -- Part 1: Fundamentals (ISO/DIS 19115-1). Draft. 2012.

ISO (2011): Geographic information -- Observation and Measurements (ISO 19156).

International Standards Organisation, Geneva.

OGC (2012): OGC Implementation Standard -- OGC® WaterML 2.0: Part 1- Timeseries (OGC 10-126r3 ). Open Geospatial Consortium

OGC (2012): OGC Discussion Paper -- HY_Features: a Common Hydrologic Feature Model Discussion Paper (OGC 11-039r2 ). Open Geospatial Consortium

WMO (2012): WMO Core Metadata Profile version 1.3 -- Specification. Draft. Geneva, 2012

1 global runoff data centre (grdc) at the german federal institute of hydrology (bfg), march 2013 1...

Documents

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review slide