MeteoInfoLab脚本示例：获取气团轨迹每个节点的气象数据

读取HYSPLIT输出的轨迹数据文件和相应时间的气象数据文件，生成轨迹图层，循环每条轨迹的节点，读出该节点的经度、纬度、气压、时间，通过对气象数据插值获得该节点的气象数据。

脚本程序：

#-----------------------------------------------------
# Author: Yaqiang Wang
# Date: 2015-9-30
# Purpose: Get meteorological data along trajectory
# Note: Sample
#-----------------------------------------------------

# Set working directory
trajDir = ‘D:/Temp/HYSPLIT‘
meteoDir = ‘D:/Temp/arl‘

# Open trjactory data file
print ‘Open trajectory data file ...‘
trajfn = os.path.join(trajDir, ‘traj_20090731‘)
print ‘Trajectory file: ‘ + trajfn
trajf = addfile_hytraj(trajfn)
# Create trajectory layer
trajLayer = trajf.trajlayer()

# Open meteorological data file
print ‘Open meteorological data file...‘
meteofn = os.path.join(meteoDir, ‘gdas1.jul09.w5‘)
print ‘Meteorological file: ‘ + meteofn
meteof = addfile(meteofn)

# Get meteorological data along trajectory
print ‘Get meteorological data along trajectory...‘
outfn = os.path.join(trajDir, ‘pblh_traj.txt‘)
outf = open(outfn, ‘w‘)
outf.write(‘Lon,Lat,Time,Heigh,PBLH,UWND\n‘)
pblvar = ‘PBLH‘
uvar = ‘UWND‘
idx = 0
for tline in trajLayer.shapes():
    t = trajLayer.cellvalue(‘StartDate‘, idx)
    h = trajLayer.cellvalue(‘StartHour‘, idx)
    t.replace(hour=h)
    for ps in tline.getPoints():
        lon = ps.X
        lat = ps.Y
        z = ps.M
        pres = ps.Z
        pbl = meteof.tostation(pblvar, lon, lat, None, t)
        uwnd = meteof.tostation(uvar, lon, lat, pres, t)
        print ‘lon: %.2f; lat: %.2f; time: %s; height: %.2f; PBLH: %.2f; UWND: %.2f‘ % (lon, lat, t.strftime(‘%Y%m%d_%H:%M‘), z, pbl, uwnd)
        line = ‘%.4f,%.4f,%s,%.2f,%.2f,%.2f‘ % (lon,lat,t.strftime(‘%Y%m%d_%H:%M‘),z,pbl,uwnd)
        outf.write(line + ‘\n‘)
        t = t + datetime.timedelta(hours=-1)
    idx += 1

outf.close()
print ‘Finish...‘