We are air quality modeling group at Rutgers University, New
Jersey. We are processing emissions and running simulation
models for our study of long range transport of Ozone and
Particulate matter for our research and for regulatory work.
The netCDF library works great for us. However, I came across
with one particular issue of netCDF and would like to discuss if
there are any solution to this problem or something that can do
to make its performance better. When we process emissions for
our three dimensional grid of size (172 x 172 x 22) for 24 hours
time period having hourly data, the file size is around 1
gigabyte(GB). There are several cells that have zero values and
therefore the floating point value for pollutants in netCDF file
has zero values. When we use gzip utility on unix to compress
this files, the file size become almost 10 MB which saves us 99%
of disk space. Now the question arise that if the netCDF is most
compress scientific format, than is it possible to suppress this
zero values of the floating point variable or is there any
switch that can be used to handle zero values and reduce file
size by any chance.
Looking forward to hear from you.
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