Expedited data 关于这个数据为何不推荐使用

chongzika

NOTE: Users are strongly cautioned against using Expedited data products as the basis for research findings or journal publications. Standard data sets only should be used for these purposes.


https://eosweb.larc.nasa.gov/project/calipso/calipso_table
calipso数据中有这个产品，不太理解它的意思，而且给出来为啥还不推荐使用

chongzika

It is beneficial to collect both the temporal and
spatial data of small particles in the atmosphere. The
CALIPSO mission allows scientists to study the radiative
effects of clouds and aerosols on a global scale. Level 2
CALIPSO data are available in two different forms: the
nominal product and the expedited product. The
nominal product is available approximately five days
after measurements are collected and is the primary
dataset for science analysis. The expedited product is
designed to support real-time applications and uses a
simple calibration scheme. Expedited processing does
not wait for the arrival of more accurate ephemeris data
and also uses climatology data instead of assimilated
meteorological data. The expedited dataset is available
~12 hours after Level 0 data are down linked to a
ground receiving station. Being that the nominal product
goes through a more rigorous computational process
and does not make calibration and climatology
assumptions, we assume the nominal product to be the
truth in comparison to the expedited product.