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海事の国際的動向に関する調査研究事業報告書(海上安全) 別冊 AISの国際的動向に関する調査研究

 事業名 海事の国際的動向に関する調査研究
 団体名 日本海難防止協会 注目度注目度5


Saint Lawrence Seaway and PAWSS AIS Messages
 
3 Wind Information Message
 
Parameter Number of bits Description
Application ID 16 DAC = 316 or 366; FI = 1; See Section 2.1
Reserved 2  
Message ID 6 Message Identifier = 2 (00 0010 in binary)
Binary Data Max 864 From 1 up to 6 wind information reports, each structured as defined in Section 3.1
Total Number of bits Max 888 = 24 + N*144

N  Total Bits  (Slots Required)
1   168 bits       (2 slots)
2   312 bits       (2 slots)
3   456 bits       (3 slots)
4   600 bits       (4 slots)
5   744 bits       (4 slots)
6   888 bits       (5 slots)
 
3.1 Wind Information Report
 
Parameter Number of bits Description
Timetag 20 Month, Day and Time of measurement, See Section 2.2
Station ID 42 Seven 6-bit ASCII character ID
Longitude 25 Longitude in 1/1000 minute (±180 degrees, East = positive, West = negative 181 degrees = not available)
Latitude 24 Latitude in 1/1000 minute (±90 degrees, North = positive, South = negative. 91 degrees = not available)
Wind Speed 10 Average Wind Speed in 1/10th Knot (0-102.2 knots, 1022 = 102.2 kts or greater, 1023 = not available)
Wind Gust 10 Wind Gust in 1/10th Knot (0-102.2 knots, 1022 = 102.2 kts or greater, 1023 = not available)
Wind Direction 9 Quantized to 16 compass points (Seaway only); See Section 3.1.1
Reserved 4 Reserved for future use
Total Number of bits 144  
 
Notes:

 Wind information is gathered from anemometers at various Seaway facilities; this information is updated every 15 minutes.
 
 The wind speed is derived from averaging the instantaneous readings over a 15-minute interval.
 
 Wind gust represents the highest wind speed measured over 15 minutes.
 
 Each wind information message may contain up to six station readings. If there are more than six station readings, additional messages shall be generated.
 
 Wind information from all sensors is transmitted to users throughout the entire Saint Lawrence Seaway AIS network.

3.1.1 Wind Direction Quantization
 
 Wind direction will be quantized to represent 16 compass points for Saint Lawrence Seaway Stations.
 
Parameter Number of bits Description
Direction 9 Direction, 0-359 degrees, 511 = not available For Saint Lawrence Seaway, refer to table below for descriptions of quantized values.
Total Number of bits 9  
 
Direction Value Description
0 N
23 NNE
45 NE
68 ENE
90 E
113 ESE
135 SE
158 SSE
180 S
203 SSW
225 SW
248 WSW
270 W
293 WNW
315 NW
338 NNW
 
3.2 Example: Wind Information Message
 
Designated Area Code Function Id Res. Message Id
0 1 0 0 1 1 1 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0
316 1 0 2
 
Timetag ・・・
0 1 0 1 1 1 1 0 1 0 0 0 0 0 1 0 0 0 1 0 0 1 0 1
5 29 00 34 "T"・・・
 
・・・Station Id・・・
0 0 0 0 0 1 0 1 0 1 0 0 1 1 0 1 0 1 0 0 1 1 0 0
・・・"T" "E" "S" "T" "1"・・・
 
・・・Station Id... Longitude・・・
0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 1 0 0 0 1
・・・"1" "" "" 27°05' E・・・
 
・・・Longitude Latitude・・・
1 0 0 1 0 1 1 1 0 1 0 1 0 0 0 0 0 0 0 0 1 0 0 1
・・・27°05' E 5°05' N・・・
 
・・・Latitude Wind Speed・・・
0 1 0 0 1 1 1 0 1 1 0 1 0 0 0 0 0 0 0 1 0 0 0 0
・・・5°05' N 3.2 Knots
 
・・・ Wind Gust Wind Direction Reserved
0 0 0 0 0 1 0 1 0 0 0 1 0 0 1 0 0 1 0 1 0 0 0 0
・・・ 4.0 Knots 293 Degrees 0
 
4 Weather Station Message
 
Parameter Number of bits Description
Application ID 16 DAC = 316 or 366; FI = 1; See Section 2.1
Reserved 2  
Message ID 6 Message Identifier = 1 (00 0001 in binary)
Binary Data Max 768 Message contains 1 to 4 weather station reports, each structured defined in Section 4.1
Total Number of bits Max 792 = 24 + N*192

N  Total Bits  (Slots Required)
1   216 bits       (2 slots)
2   408 bits       (3 slots)
3   600 bits       (4 slots)
4   792 bits       (5 slots)
 
4.1 Weather Station Report
 
Timetag 20 Month, Day and Time of measurement, See Section 2.2
Station ID 42 Seven 6-bit ASCII character ID
Longitude 25 Longitude in 1/1000 minute (±180 degrees, East = positive, West = negative. 181 = not available)
Latitude 24 Latitude in 1/1000 minute (±90 degrees, North = positive, South = negative. 91 = not available)
Wind Speed 10 Speed in 1/10th Knot; 0-102.2 knots, 1022 = 102.2 kts or greater, 1023 = not available
Wind Gust 10 Gust in 1/10th Knot; 0-102.2 knots, 1022 = 102.2 kts or greater, 1023 = not available
Wind Direction 9 Direction in degrees; 0-359 degrees, 511=NA
Atmospheric Pressure 14 Expressed in 1/10th millibars. (16383 = not available)
Air Temp 10 Temperature in 1/10th of a degree Celsius (signed) (-511 to 511 valid range, -511 = -51.1℃ or less, 511 = 51.1℃ or greater, -512 = not available)
Dew Point 10 Temperature in 1/10th of a degree Celsius (signed) (-511 to 511 valid range, -511 = -51.1℃ or less, 511 = 51.1℃ or greater, -512 = not available)
Visibility 8 Visibility in 1/10 kilometers. (0-254, 254 = 25.4km or greater, 255 = not available)
Water Temp 10 Temperature in 1/10th of a degree Celsius (signed) (-511 to 511 valid range, -511 = -51.1℃ or less, 511 = 51.1℃ or greater, -512 = not available)
Total Number of bits 192  
 
Notes:

 The Weather Station Reports are station observations from the National Data Buoy Center (NDBC). Typically, the information is updated once every hour. Depending on climatic conditions, traffic controllers at the Massena, New York Vessel Traffic Control Center may provide weather condition updates at a more frequent update interval.
 
 The Seaway AIS network will broadcast the following NDBC stations for the Saint Lawrence River:
・Superior Shoals, NY Station Identifier: SUPN6
・Thousand island Bridge. NY Station Identifier: THIN6
・Alexandria Bay, NY Station Identifier: ABAN6
 
 Please refer to the National Data Buoy Center web site at the following address for additional information.
 
 
 The Weather Station Messages are transmitted to users throughout the entire Saint Lawrence Seaway AIS network.

4.2 Example: Weather Station Message
 
Designated Area Code Function Id Res. Message Id
0 1 0 0 1 1 1 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1
316 1 0 1
 
Timetag ・・・
0 1 0 1 1 1 1 0 1 0 0 0 0 0 1 0 0 0 1 0 0 1 0 1
5 29 00 34 "T"・・・
 
・・・Station Id・・・
0 0 0 0 0 1 0 1 0 1 0 0 1 1 0 1 0 1 0 0 1 1 0 0
・・・"T" "E" "S" "T" "1"・・・
 
・・・Station Id Longitude・・・
0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 1 0 0 0 1
・・・"1" "" "" 27°05' E・・・
 
・・・Longitude Latitude・・・
1 0 0 1 0 1 1 1 0 1 0 1 0 0 0 0 0 0 0 0 1 0 0 1
・・・27°05' E 5°05' N・・・
 
・・・Latitude Wind Speed・・・
0 1 0 0 1 1 1 0 1 1 0 1 0 0 0 0 0 0 0 1 0 0 0 0
・・・5°05' N 3.2 Knots
 
・・・ Wind Gust Wind Direction ・・・
0 0 0 0 0 1 0 1 0 0 0 1 0 0 1 0 0 1 0 1 1 0 0 1
・・・ 4.0 Knots 293 Degrees ・・・
 
・・・Atmospheric Pressure Air Temp Dew Point・・・
1 1 0 0 0 1 0 0 0 0 1 1 1 1 1 1 1 1 1 0 1 1 1 1
1000 millibars -0.2℃ ・・・
 
・・・Dew point Visibility Water Temp
1 1 0 1 0 0 0 0 0 0 1 0 0 1 0 0 0 0 1 1 1 1 0 0
・・・-1.2℃ 0.9 Km 6.0℃







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成果物アクセスランキング
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(31,428成果物中)

成果物アクセス数
16,457

集計期間:成果物公開〜現在
更新日: 2019年8月10日

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