Institute for Environment and Sustainability 1
Sea outlet coding
Knowing to where the water flows to with 4 digits.
…a Structured basis to code hydrological features
Institute for Environment and Sustainability 2
Sea outlet coding
Purpose of coding
Level of detail
Hydrographic systems
Watershed coding inspired on Pfafstetter
CCM2 implementation
Transfer rules for non CCM2 features
Examples
Institute for Environment and Sustainability 3
Purpose of codingThe purpose of hydrological coding is to understand through the codingthe relations between rainfall and surface runoff in a landscape dominated by a surplus rainfall
To exchange geographic features an unique and shared identifier is needed for every feature
A coding system, in order to be successful must be short and comprehensive, anybody must be able to determinethe code for his part of the world
Institute for Environment and Sustainability 4
Hydrological systems definition
Institute for Environment and Sustainability 5
Seas
SYSTEM SEA NAMEA 1 Northern Atlantic OceanA 2 Norwegian SeaA 4 Celtic Sea and ChannelsA 5 North SeaA 6 Baltic SeaA 7 Western Mediterranean SeaA 8 Eastern Mediterranean SeaA 9 Black SeaN 7 Barentz Sea EastN 8 Barentz Sea WestN 9 White SeaC 1 Caspian SeaS 1 Southern Atlantic OceanT 9 Trasimeno LakeQ 9 Prespa LakeZ 9 Tuz Salt LakeV 9 Van LakeH 9 Orumiyeh Salt Lake
Institute for Environment and Sustainability 6
Commencement
Institute for Environment and Sustainability 7
Level of Detail
Primary catchments of ±10 km2
Institute for Environment and Sustainability 8
Transfer to WFD
Institute for Environment and Sustainability 9Ordering and aggregation
Institute for Environment and Sustainability 10
Ordering the Seaoutlets
Institute for Environment and Sustainability 11
Sea Aggregation
Institute for Environment and Sustainability 12
Island coding
• Procedure proposal– Find closest continental coastline
– Determine length along coastline to this point
– Order along the coast line• Example
– Ibiza
– Mallorca
– Menorca
– Corsica
– Sardinia
– Implementation for example a hexadecimal nr AA FF etc.
Institute for Environment and Sustainability 13
Island coding example
Institute for Environment and Sustainability 14
http://wise2.jrc.it
Full code:
Hydrological System Letter {A..Z}Sea Nr {1..9}
Island sequence {A0..F9}Commencement Code {1..99999}
Riversegment Pfaffstetter code {1..9999999999}
Rhine outlet: A500000081Rhine source: A500000089
Long river on Ibiza: A701000029Longest Riversegment code is 1985982445 in Dnepr