S-126

Physical Environment
a place to discuss and follow the work

Knowledgeable WG members: briana sullivan (UNH), Jens Schröder-Fürstenberg (Germany), Tom Loeper (USA), Yves Le Franc (SHOM)

OLD ORIGINAL - Sample Test Data File:Physical Environment Test Data Sample.docx (NOTE: we are now using real samples from US Coast Pilot and US Sailing Directions)

NEW listing of terms with data source (Annex A)

File:Coast Chart Term Frequency NIPWG Version.xlsx - a new list of terms compiled from all possible sources related to the Physical Environment that contains statistics on the frequency of word use within the 9 volumes of the US Coast Pilot. It will be used as a guide to focus on terms to research and build use case scenarios so we know what is of value to model and what doesn't need representation.

Maritime Topography

(these terms origniated from scanning the publications and discussing among the group which were the most SIGNIFICANT features a mariner needed for navigation)

• General Remarks
  • Chart reference
  • general description of the area (topological as well as submarine)
• Seabed and Features
  • Deeps
  • Ridges and Plateaux
  • Shoals and Banks
• Submarine Springs
• Volcanic Activity
• Seismic Activity

Magnetic Variations and Local Anomalies

• Magnetic Variations
• Magnetic Anomalies

S-101

From DCEG Geo Feature Magnetic Data

Magnetic Variation - MAGVAR (4.1)

S-101 Geo Feature

The angle between the magnetic and geographic meridians at any place, expressed in degrees east or west to indicate the direction of magnetic north from true north. Also called magnetic declination. (IHO Dictionary –S-32).

(until a world magnetic model is universally available for inclusion in ECDIS mag var is most important magnetic data for the mariner. Updates should be supplied every five years to coincide with changes of epoch).

S-101 Attributes

  RYRMGV - reference year for magnetic variation. (YYYY)
  VALACM - value of annual change in magnetic variation. (+/- minutes: easterly/westerly)
  SCAMIN - scale minimum

Local Magnetic Anomaly - LOCMAG (4.2)

S-101 Geo Feature

An anomaly of the magnetic field of the Earth, extending over a relatively small area, due to local magnetic influences. Also called local attraction or magnetic anomaly. (IHO Dictionary –S-32).

If it is required to encode an abnormality in magnetic variation fora localised area, it must be done using the feature Local Magnetic Anomaly.If the area cannot be defined, the feature should be represented as a point.

S-101 Attributes

Feature Name
   display name
   language
   name OBJNAM/NOBJNM

reported date SORDAT

value of local magnetic anomaly
    magnetic anomaly value maximum VALLMA
    magnetic anomaly value minimum 

scale minimum SCAMIN

Remarks

Where the mandatory complex attribute value of local magnetic anomaly contains a value in the sub-attribute magnetic anomaly value maximum only, the deviation is assumed to be positive and negative by that amount. Where the positive and negative values for the local magnetic anomaly differ, the positive value must be populated in anomaly value maximum, and the negative value in the sub-attribute magnetic anomaly value minimum. The plus/minus character must not be encoded.

Abnormal magnetic variation should not be encoded unless it varies by more than about 3° from the normal magnetic variation (see clause4.1) for the area.

Coast Pilot examples

(120) Differences of as much as 5° from the normal variation have been observed near the mouth of Smyrna River.   

(166) Differences of as much as 2° to 5° from normal variation have been observed along the channel from Artificial Island to Marcus Hook. 

(232) Differences of 2° to 5° from normal variation have been observed astride the Delaware River Channel from Oldmans Point to the mouth of Oldmans Creek.  

(79) Differences of as much as 6° from the normal variation have been observed in Elk River Channel from Courthouse Point to Old Town Point. 

(30) Differences of as much as 6° from the normal variation have been observed 3 to 17 miles offshore from Cape Henry to Currituck Beach Light. 

(130) Differences of as much as 5° from the normal variation have been observed in the channel from Pooles Island to Howell Point (chart 12274). 

(180) Differences of 3° to 8° from normal variation have been observed in Elk River channel from Grove Point to Courthouse Point. 

Possible Data Elements Needed

Observation location description - would it be HELPFUL to have the cultural points within the area maintained?

(perhaps it is more understandable for someone to keep in their mind map of the area the familiar names delineating the locations vs only an outline on the chart?)

Currents, Tidal Streams and Flow

• Currents
  • General Information
  • Named Currents
  • Seasonal Currents
• Tidal Streams

Sea Level and Tides

• Sea Level
• Tides

Sea and Swell

• Sea Conditions
• Swell Conditions
• Tropical Disturbances
• Abnormal Waves

Sea Water Characteristics

• Salinity
• Density
• Sea Surface Temperature

Ice Conditions

• Drift Ice
• Icebergs

Climate and Weather

• General Information
• General Conditions
  • Climate
  • Visibility
  • Cyclones
• Pressure
  • Average Distribution
  • Variability
  • Diurnal Variation
  • Abnormal Falls
• Anticyclones
  • Sub-tropical high pressure belt
• Depressions
  • General Information
  • Cyclones, tropical storms, tropical depressions
  • Classification
  • Occurrence
  • Average occurrence of tropical storms and cyclones in the SW indian ocean (this seems too specific for a heading)
  • Movement
• Fronts
  • Cold Fronts
  • The intertropical convergence zone
• Winds
  • General information
  • South-east trade winds
  • The North-west monsoon
  • Light or moderate variable winds
  • The Westerlies
  • Coastal Areas
  • Land and sea breeze
• Gales
  • General Information
  • Winds north of 30°S
  • Winds south of 30°S
  • Squalls
  • Waterspouts
• Cloud
  • North of 30°S
  • The sub-tropical belt of high pressure
  • South of 30°S
• Precipitation
  • General Information
  • The North-west monsoon and ITCZ
  • Madagascar
  • La Reunion, tec
  • Cycolones
  • The sub-tropical belt of high pressure
• Fog and visibility
  • Sea fog
  • Radiation fog
• Air Temperature
  • Open sea
  • Coastal areas
• Humidity
  • General Information
  • Open sea N of 30°S
  • South of 30°S

Climate Information

• Climate Station Information

QUESTIONS/COMMENTS/MISSING ITEMS

• Where are the Physical Descriptions of features, approaches, ports, anchorages, etc?
• Are references to external documents (i.e. Mariner's Handbook) to be kept or actual data from the reference or attach pdf?
• S-26 ?(undersea feature names) should be incorporated into this