path        relative_path _model/LL/_attribute/_name
filename    _basetime
type1       _SRF LL LY
type2       AA SV
type3       PR10
validtime   48 MIN in
validtime1  ARITHMETIC 30 30
plane       1
plane1      SURF
element     1
elementmap  RR60LV   0
size        2560 3360
distance    0.0125 0.008333333
basepoint   0.5 0.5 118.0E 48.0N
value       REPR
packing     RLEN
missing     NONE
subcntl     1 ISPC 512
# 512 = 4[byte] * 128[sizeof(subcntl_array)] * 1[plane] * 1[element]

