Patent ID: 11869124
Assignee: SHANGHAI TYPHOON INSTITUTE OF THE CHINA METEOROLOGICAL ADMINISTRATION
Field: Computer technology (Electrical engineering)
Classification: CPC G  Y | IPC G

Claim 2:
3. The visualization analysis method of tropical cyclone forecast verification index data according to claim 2, characterized in that, the track forecast verification index data includes position error AR, moving direction error Act, and moving speed error ASP, which are respectively defined by the following formulas:

ΔR=6371×arccos{sin φF sin φR+cos φF cos φR cos(λF−λR)};

Δα=arccos{(cos A−cosB·cosC)/(sinB·sinC)};

ΔSP=6371×{arccosB−arccosC}/Δt; 

wherein, cos A=sin φF sin φR+cos φF cos φR cos(λF−λR);

cos B=sin φF sin φI+cos φF cos φI cos(λF−λI);

cos C=sin φR sin φI+cos φR cos φI cos(λR−λI);

wherein A is the initial position A(φI, λI): B is the forecasted position B(φF, λF), C is the actual position C(φR, λR); ΔR is the position error, that is, the distance between the forecasted position B(φF, λF) and the actual position C(φR, λR), and the unit of said position error is km; Δα is the moving direction error, that is, the included angle between the direction from the initial position A(φI, λI) to the forecasted position B(φF, λF) and the direction from the initial position A(φI, λI) to the actual position C(φR, λR), and the unit of the moving direction error is azimuth; where ASP is the moving speed error, that is, the difference between the forecasted moving speed and the actual moving speed of the tropical cyclone, and the unit of the moving speed error is kilometers per hour; Parameter 6371 represents radius of the earth; Δt is the forecast time, that is, the time it takes for the tropical cyclone to move from the initial position A(φI, λI), to the forecasted position B(φF, λF).