event_description
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prolog_rule
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A vessel enters an area, starting the condition withinArea.
initiatedAt(withinArea(Vessel, AreaType)=true, T) :- happensAt(entersArea(Vessel, Area), T), areaType(Area, AreaType).
A vessel leaves an area, ending the condition withinArea.
terminatedAt(withinArea(Vessel, AreaType)=true, T) :- happensAt(leavesArea(Vessel, Area), T), areaType(Area, AreaType).
A vessel initiates a communication gap, ending the condition withinArea.
terminatedAt(withinArea(Vessel, _AreaType)=true, T) :- happensAt(gap_start(Vessel), T).
A communication gap starts near ports for a vessel.
initiatedAt(gap(Vessel)=nearPorts, T) :- happensAt(gap_start(Vessel), T), holdsAt(withinArea(Vessel, nearPorts)=true, T).
A communication gap starts far from ports for a vessel.
initiatedAt(gap(Vessel)=farFromPorts, T) :- happensAt(gap_start(Vessel), T), \+holdsAt(withinArea(Vessel, nearPorts)=true, T).
A communication gap ends for a vessel.
terminatedAt(gap(Vessel)=_PortStatus, T) :- happensAt(gap_end(Vessel), T).
A vessel stops near ports, starting the condition stopped.
initiatedAt(stopped(Vessel)=nearPorts, T) :- happensAt(stop_start(Vessel), T), holdsAt(withinArea(Vessel, nearPorts)=true, T).
A vessel stops far from ports, starting the condition stopped.
initiatedAt(stopped(Vessel)=farFromPorts, T) :- happensAt(stop_start(Vessel), T), \+holdsAt(withinArea(Vessel, nearPorts)=true, T).
A vessel resumes movement, ending the condition stopped.
terminatedAt(stopped(Vessel)=_Status, T) :- happensAt(stop_end(Vessel), T).
A vessel initiates a communication gap, ending the condition stopped.
terminatedAt(stopped(Vessel)=_Status, T) :- happensAt(start(gap(Vessel)=_GapStatus), T).
A vessel starts moving slowly.
initiatedAt(lowSpeed(Vessel)=true, T) :- happensAt(slow_motion_start(Vessel), T).
A vessel stops moving slowly.
terminatedAt(lowSpeed(Vessel)=true, T) :- happensAt(slow_motion_end(Vessel), T).
A vessel initiates a communication gap, ending the condition lowSpeed.
terminatedAt(lowSpeed(Vessel)=true, T) :- happensAt(start(gap(Vessel)=_Status), T).
A vessel moves with high speed near the coast, starting the condition highSpeedNearCoast.
initiatedAt(highSpeedNearCoast(Vessel)=true, T) :- happensAt(velocity(Vessel, Speed, _, _), T), thresholds(hcNearCoastMax, HcNearCoastMax), \+ inRange(Speed, 0, HcNearCoastMax), holdsAt(withinArea(Vessel, nearCoast)=true, T).
A vessel's high speed near the coast is within the limit, ending the condition highSpeedNearCoast.
terminatedAt(highSpeedNearCoast(Vessel)=true, T) :- happensAt(velocity(Vessel, Speed, _, _), T), thresholds(hcNearCoastMax, HcNearCoastMax), inRange(Speed, 0, HcNearCoastMax).
A vessel's high speed near the coast ends, ending the condition highSpeedNearCoast.
terminatedAt(highSpeedNearCoast(Vessel)=true, T) :- happensAt(end(withinArea(Vessel, nearCoast)=true), T).
A vessel moves below the normal speed, starting the condition movingSpeed=below.
initiatedAt(movingSpeed(Vessel)=below, T) :- happensAt(velocity(Vessel, Speed, _, _), T), vesselType(Vessel, Type), typeSpeed(Type, Min, _Max, _Avg), thresholds(movingMin, MovingMin), inRange(Speed, MovingMin, Min).
A vessel moves at normal speed, starting the condition movingSpeed=normal.
initiatedAt(movingSpeed(Vessel)=normal, T) :- happensAt(velocity(Vessel, Speed, _, _), T), vesselType(Vessel, Type), typeSpeed(Type, Min, Max, _Avg), inRange(Speed, Min, Max).
A vessel moves above the normal speed, starting the condition movingSpeed=above.
initiatedAt(movingSpeed(Vessel)=above, T) :- happensAt(velocity(Vessel, Speed, _,_), T), vesselType(Vessel, Type), typeSpeed(Type, _Min, Max,_Avg), inRange(Speed, Max, inf).
A vessel's speed is not within the moving range, ending the condition movingSpeed.
terminatedAt(movingSpeed(Vessel)=_Status, T) :- happensAt(velocity(Vessel, Speed, _,_), T), thresholds(movingMin,MovingMin), \+inRange(Speed, MovingMin, inf).
A vessel starts a communication gap, ending the condition movingSpeed.
terminatedAt(movingSpeed(Vessel)=_Status, T) :- happensAt(start(gap(Vessel)=_GapStatus), T).
A vessel starts drifting, initiating the condition drifting.
initiatedAt(drifting(Vessel)=true, T) :- happensAt(velocity(Vessel,_Speed, CourseOverGround, TrueHeading), T), TrueHeading =\= 511.0, absoluteAngleDiff(CourseOverGround, TrueHeading, AngleDiff), thresholds(adriftAngThr, AdriftAngThr), AngleDiff > AdriftAngThr, holdsAt(underWay(Vessel)=true, T).
A vessel stops drifting when angle difference is less than or equal to threshold, ending the condition drifting.
terminatedAt(drifting(Vessel)=true, T) :- happensAt(velocity(Vessel,_Speed, CourseOverGround, TrueHeading), T), absoluteAngleDiff(CourseOverGround, TrueHeading, AngleDiff), thresholds(adriftAngThr, AdriftAngThr), AngleDiff =< AdriftAngThr.
A vessel stops drifting when TrueHeading is 511.0, ending the condition drifting.
terminatedAt(drifting(Vessel)=true, T) :- happensAt(velocity(Vessel,_Speed, _CourseOverGround, 511.0), T).
A vessel stops drifting when it stops underway, ending the condition drifting.
terminatedAt(drifting(Vessel)=true, T) :- happensAt(end(underWay(Vessel)=true), T).
A vessel is anchored or moored, initiating the condition anchoredOrMoored.
holdsFor(anchoredOrMoored(Vessel)=true, I) :- holdsFor(stopped(Vessel)=farFromPorts, Istfp), holdsFor(withinArea(Vessel, anchorage)=true, Ia), intersect_all([Istfp, Ia], Ista), holdsFor(stopped(Vessel)=nearPorts, Istnp), union_all([Ista, Istnp], I).
A vessel moves at tugging speed, initiating the condition tuggingSpeed.
initiatedAt(tuggingSpeed(Vessel)=true , T) :- happensAt(velocity(Vessel, Speed, _, _), T), thresholds(tuggingMin, TuggingMin), thresholds(tuggingMax, TuggingMax), inRange(Speed, TuggingMin, TuggingMax).
A vessel stops moving at tugging speed, ending the condition tuggingSpeed.
terminatedAt(tuggingSpeed(Vessel)=true , T) :- happensAt(velocity(Vessel, Speed, _, _), T), thresholds(tuggingMin, TuggingMin), thresholds(tuggingMax, TuggingMax), \+inRange(Speed, TuggingMin, TuggingMax).
A vessel initiates a communication gap, ending the condition tuggingSpeed.
terminatedAt(tuggingSpeed(Vessel)=true , T) :- happensAt(start(gap(Vessel)=_Status), T).
Two vessels are tugging, initiating the condition tugging.
holdsFor(tugging(Vessel1, Vessel2)=true, I) :- holdsFor(proximity(Vessel1, Vessel2)=true, Ip), holdsFor(tuggingSpeed(Vessel1)=true, Its1), holdsFor(tuggingSpeed(Vessel2)=true, Its2), intersect_all([Ip, Its1, Its2], I).
Two vessels rendezvous, initiating the condition rendezVous.
holdsFor(rendezVous(Vessel1, Vessel2)=true, I) :- holdsFor(proximity(Vessel1, Vessel2)=true, Ip), holdsFor(lowSpeed(Vessel1)=true, Il1), holdsFor(lowSpeed(Vessel2)=true, Il2), holdsFor(stopped(Vessel1)=farFromPorts, Is1), holdsFor(stopped(Vessel2)=farFromPorts, Is2), union_all([Il1, Is1], I1b), union_all([Il2, Is2], I2b), intersect_all([I1b, I2b, Ip], If), holdsFor(withinArea(Vessel1, nearPorts)=true, Iw1), holdsFor(withinArea(Vessel2, nearPorts)=true, Iw2), holdsFor(withinArea(Vessel1, nearCoast)=true, Iw3), holdsFor(withinArea(Vessel2, nearCoast)=true, Iw4), relative_complement_all(If,[Iw1, Iw2, Iw3, Iw4], I).
A vessel moves at trawl speed, initiating the condition trawlSpeed.
initiatedAt(trawlSpeed(Vessel)=true, T):- happensAt(velocity(Vessel, Speed, _Heading,_), T), thresholds(trawlspeedMin, TrawlspeedMin), thresholds(trawlspeedMax, TrawlspeedMax), inRange(Speed, TrawlspeedMin, TrawlspeedMax), holdsAt(withinArea(Vessel, fishing)=true, T).
A vessel stops moving at trawl speed, ending the condition trawlSpeed.
terminatedAt(trawlSpeed(Vessel)=true, T):- happensAt(velocity(Vessel, Speed, _Heading,_), T), thresholds(trawlspeedMin, TrawlspeedMin), thresholds(trawlspeedMax, TrawlspeedMax), \+inRange(Speed, TrawlspeedMin, TrawlspeedMax).
A vessel initiates a communication gap, ending the condition trawlSpeed.
terminatedAt(trawlSpeed(Vessel)=true, T):- happensAt(start(gap(Vessel)=_Status), T).
A vessel stops being in a fishing area, ending the condition trawlSpeed.
terminatedAt(trawlSpeed(Vessel)=true, T):- happensAt(end(withinArea(Vessel, fishing)=true), T).
A vessel starts trawling movement, initiating the condition trawlingMovement.
initiatedAt(trawlingMovement(Vessel)=true , T):- happensAt(change_in_heading(Vessel), T), holdsAt(withinArea(Vessel, fishing)=true, T).
A vessel stops being in a fishing area, ending the condition trawlingMovement.
terminatedAt(trawlingMovement(Vessel)=true, T):- happensAt(end(withinArea(Vessel, fishing)=true), T).
A vessel starts trawling, initiating the condition trawling.
holdsFor(trawling(Vessel)=true, I):- holdsFor(trawlSpeed(Vessel)=true, It), holdsFor(trawlingMovement(Vessel)=true, Itc), intersect_all([It, Itc], I).
A vessel moves at SAR speed, initiating the condition sarSpeed.
initiatedAt(sarSpeed(Vessel)=true , T):- happensAt(velocity(Vessel, Speed, _, _), T), thresholds(sarMinSpeed, SarMinSpeed), inRange(Speed,SarMinSpeed,inf).
A vessel stops moving at SAR speed, ending the condition sarSpeed.
terminatedAt(sarSpeed(Vessel)=true, T):- happensAt(velocity(Vessel, Speed, _, _), T), thresholds(sarMinSpeed, SarMinSpeed), inRange(Speed,0,SarMinSpeed).
A vessel initiates a communication gap, ending the condition sarSpeed.
terminatedAt(sarSpeed(Vessel)=true, T):- happensAt(start(gap(Vessel)=_Status), T).
A vessel changes heading, initiating the condition sarMovement.
initiatedAt(sarMovement(Vessel)=true, T):- happensAt(change_in_heading(Vessel), T).
A vessel changes speed, initiating the condition sarMovement.
initiatedAt(sarMovement(Vessel)=true , T):- happensAt(change_in_speed(Vessel), T).
A vessel initiates a communication gap, ending the condition sarMovement.
terminatedAt(sarMovement(Vessel)=true, T):- happensAt(start(gap(Vessel)=_Status), T).
A vessel performs SAR operations, initiating the condition inSAR.
holdsFor(inSAR(Vessel)=true, I):- holdsFor(sarSpeed(Vessel)=true, Iss), holdsFor(sarMovement(Vessel)=true, Isc), intersect_all([Iss, Isc], I).
A vessel loiters, initiating the condition loitering.
holdsFor(loitering(Vessel)=true, I) :- holdsFor(lowSpeed(Vessel)=true, Il), holdsFor(stopped(Vessel)=farFromPorts, Is), union_all([Il, Is], Ils), holdsFor(withinArea(Vessel, nearCoast)=true, Inc), holdsFor(anchoredOrMoored(Vessel)=true, Iam), relative_complement_all(Ils, [Inc,Iam], I).
Two vessels perform pilot operations, initiating the condition pilotOps.
holdsFor(pilotOps(Vessel1, Vessel2)=true, I) :- holdsFor(proximity(Vessel1, Vessel2)=true, Ip), holdsFor(lowSpeed(Vessel1)=true, Il1), holdsFor(lowSpeed(Vessel2)=true, Il2), holdsFor(stopped(Vessel1)=farFromPorts, Is1), holdsFor(stopped(Vessel2)=farFromPorts, Is2), union_all([Il1, Is1], I1b), union_all([Il2, Is2], I2b), intersect_all([I1b, I2b, Ip], Ii), Ii\=[]), holdsFor(withinArea(Vessel1, nearCoast)=true, Iw1), holdsFor(withinArea(Vessel2, nearCoast)=true, Iw2), relative_complement_all(Ii,[Iw1, Iw2], I).

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