关于flexpart的输出

grassc

手册里 有下面一段话 ，真心看不懂， 谁能给解释一下里面提到的这四个变量什么意思吗？ 谢谢啦。 sp_count_i，sparse_dump_i(n) ， sp_count_r，sparse_dump_r(n)


In version 8.0, the output has been redesigned completely
for yet more efficiency such that output file sizes are only
about 40% of what they used to be. The output grid is
searched for consecutive sequences of non-zero values. The
variable sp_count_i gives the number of such sequences
(n), and the integer field sparse_dump_i(n) contains
the field positions of the first non-zero element for every se-
quence. The variable sp_count_r gives the total number
(k) of non-zero values written out. They are contained in the
real field sparse_dump_r(n). Since all physical output
quantities of FLEXPART are non-zero, sequences are writ-
ten out alternatingly as positive or negative values. Every
switch between positive and negative values indicates that a
new sequence with non-zero values starts. The field posi-
tion for that start is contained in sparse_dump_i(k) for
the k-th switch between positive and negative. Zero values in
between sequences are ignored and not written out. Field po-
sitions within the 3-d output field are coded such that a single
integer value is sufficient. It can later be converted back to
give positions in all three coordinates.