wise-gis workshop, dublin, 15&16 january 2008 20.01.2016| folie 1 wise gis guidance – second...
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WISE-GIS Workshop, Dublin, 15&16 January | Folie 3 Definition of terms Reference features are geographic features reported by Member States to WISE. They can be hydrological features or non hydrological features. (a) hydrological reference features are hydrological features used at European level in WISE as reference for thematic geographic data. Hydrological reference features carry a hydrological feature code (e.g. river basins, rivers, lakes) (b) non-hydrological reference features Non-hydrological reference features carry unique identifiers (e.g. water bodies, monitoring stations)TRANSCRIPT
WISE-GIS Workshop, Dublin, 15&16 January 2008 03.05.23| Folie 1
WISE GIS guidance – second edition
Chapter 5.4: European Feature Coding
WISE GIS WorkshopDublin
15&16 January 2008
Gabriela VinczeIngrid Roder
WISE-GIS Workshop, Dublin, 15&16 January 2008 03.05.23| Folie 2
Content
Definition of terms Unique European codes
Non hydrological reference features Hydrological features
Application of codes Management of codes
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Definition of terms
Reference featuresare geographic features reported by Member States to WISE. They can be hydrological features or non hydrological features.
(a) hydrological reference featuresare hydrological features used at European level in WISE as reference for thematic geographic data. Hydrological reference features carry a hydrological feature code (e.g. river basins, rivers, lakes)
(b) non-hydrological reference featuresNon-hydrological reference features carry unique identifiers (e.g. water bodies, monitoring stations)
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Unique European Codes
Unique European codes will be applied to Non-hydrological reference features
River basin districts, Sub-units, Water bodies, monitoring stations, discharge points, point sources, …
Hydrological reference features River(sub)basins (Main)Rivers River Segments (reaching from confluence to
confluence) Lakes
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Non-hydrological identifiers
Unique non-hydrological identifier are provided by the following format (see CIS Guidance doc. No. 9)
MS#1#2…#22 whereMS = a 2 character Member State identifier, in accordance with
ISO 3166-1-Alpha-2 country codes, and #1#2…#22 = an up to 22 character feature code that is unique
within the Member State. Entity types can be used to identify the types of
features Non-hydrological reference features should carry the
code of the hydrological feature to which they are related as a foreign key
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Non-hydrological identifiers: entity types
The list of entity types has to be managed at European level
Lenght of the entity type code segement is fixed to two characters
Example Hydrological features (ESTAT Coding Paper)
River basin BA River segment RS …
Specifications for reporting geographical data under UWWTD
Sensitive Area SA Sensitive Area – river RI Sensitive Area – lake LK …
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Coding hydrological features
Based on the work of the ad-hoc coding group:Proposal for an European coding system for hydrological feature, v3, Sept. 2007 (Appendix 7)
further developed by JRC:Recommendations for the creation of a coding system for surface hydrological features (Appendix 8) Hydrological System and Sea region code Pfafstetter commencement code Island coding Hydrological RBD Code
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Elements of the hydrological code
Hydrological System and Sea region code Island Code Pfafstetter commencement code River segments and elementary catchment
Pfafstetter code Entity type code Lake identifier
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Hydrological System and Sea region
Code Oceans
A North Eastern Atlantic Ocean
W North Western Atlantic Ocean
S South Atlantic Ocean
M Mediterranean Sea
N Arctic Ocean
I Indian Ocean
P Northern Pacific Ocean
B Southern Pacific Ocean
Hydrographical System Sea Nr. Sea NameNorth Eastern Atlantic Ocean 1 Open Ocean
2 Norwegian Sea
4 Celtic Sea and Channels
5 North Sea
6 Baltic Sea
North Western Atlantic Ocean 1 Open Ocean
2 Caribbean Sea
Mediterranean Sea 2 Western Basin
4 Eastern Basin
5 Black Sea
Arctic Ocean 7 Barents Sea East
8 White Sea
9 Barents Sea West
Indian Ocean 1 Open Ocean
Code Endorheic System
C Caspian Sea
H Orumiyeh Lake
V Van Lake
Z Tuz Saltlake
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Elements of the hydrological code (2)
Island coding (proposal available – see Appendix 8)
Pfafstetter commencement code (available with CCM2: http://agrienv.jrc.it/activities/catchments/)
River segments and elementary catchment Pfafstetter code (available with CM2)
see presentation Alfred de Jager
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Elements of the hydrological code (3)
Entity types An entity type can be
used to identify the type of a feature (see slide 6 – non-hydrological identifiers)
Lake identifier Required for lakes that
are not coneccted to a river network
Has to be managed within an international river basin on European or international level
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Elements of the hydrological code (4)Abbreviation Logical Element Relation to Data type Min., Max.
Lenght
H or HDM_ID Coastline, Hydrological system
String 1
S or SEA_ID Coastline, Sea Hydrological system Number 1-9, 1
II or Island sort Landmass, Island sort
Sea and Hydrological system
Hexadecimal number
2
CCCCC or Commencement
Sea outlet commencement code
Sea and Hydrological system and Island
Number 11111 – 99999,
5
P or Pfafstetter River-reaches Pfafstetter
Seaoutlet Number 1-12
E or Entity type Entity type code Character 2
L or Lake identifier Lake identifier Character 0,2
Can be stored in seperate files in the database – elements can be used flexible
Data exchange – elements can be concatenated The format of the code will be as follows: HSIICCCCCPPPPPPPPPPPPEELL
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Application of the hydrological code
River Basin District Code (national and international RBDs)
1. River Basin District Hydrological Code see presentation Alfred de Jager
2. Admin. River Basin District Code
International river and lake codeWork in progress
Element Relation to Data type Min., Max. Lenght
Coastline, Hydrological system
String 1
Coastline, Sea Hydrological system Number 1-9, 1
Consecutive number Number 1-9 3
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RBD Codes
International RBD Codes Appendix 9:Chapter_5.4_Feature_coding_Appendix9_v1.0_2008014.xls
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Application of the hydrological code (2)
WISE GIS Reference dataset – EU level Requirement
Topological river newtork including basins with catchment boundaries lakes
Topological relation between the basin dataset and river network
Option Using CCM2 and transfer codes from CCM2 to main
rivers
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Application of the hydrological code (3)
MS Are invited to apply the coding system Pfafstetter commencement code:
http://agrienv.jrc.it/activities/catchments/ Pilot study: Danube River Basin District
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Management of codes
It is proposed to manage the following identifiers at the European level:
a) hydrological features codes of harmonised WISE Water Reference datasets:
Main rivers (> 500 km²) and main lakes (>100 km²) River Basins of main rivers and large rivers
b) non-hydrological identifiers of harmonised WISE Water Reference datasets :
River Basin Districts Sub-Units
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Management of codes
MS will be responsible to Manage their hydrological codes and non
hydrological identifiers To keep them consistent and unique
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Recommendations
Provision of unique identifiers for each of the spatial objects defined in the WISE data model
Documentation of life-cycle rules when the existing object is redundant and a new
object with a new identifier is createdReporting the same feature always with the
same identifier (e.g. monitoring stations reported to SoE, WFD, Nitrates Directive, …)
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Requirements (1)
Uniqueness: No two spatial objects of spatial object types shall
have the same identifiers The identifier shall not be used again if an object is
modified.Persistence:
The identifier shall remain unchanged during the life-time of an object.
The definition of every spatial object type shall state which modifications (e.g. attribute changes, merging with other spatial objects) do or may change the identity of a spatial object
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Requirements (2)
Example: new identifiers shall to be created if the location of a point features changes (e.g.
Monitoring station is moved upstream or downstream;); threshold 125 m in accordance to the positional accuracy recommended for GIS datasets (according to the scale 1:250.000)
the location or length of a line feature changes (e.g. river water body: in any case if water bodies are divided or merged)
the location or size of a polygon changes (e.g. two groundwater bodies: in any case if water bodies are divided or merged)
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Temporal aspects
The temporal aspect of the non-reference features entails the follow-up of changes in time. It will be necessary to establish a system that manages changes of features, i.e. lifetime periods and identification of predecessors and successors.
See also chapter 4.2 General principles
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Next steps
Apply hydrological codes at EU level – main rivers, main lakes
Develop river codes Develop entity type code list at EU level – if
feasible Publish admin. RDB code proposed after
checking by MS Pilot application of codes: Danube River Basin
District
comments until End of January 2008