The product version is given in the MISR data file name using the designator _nnnn_ where nnnn is the product version number. Early on in the mission, several significant changes to ancillary datasets were required, and these changes triggered Product Version increments. At this point in time, most of the static ancillary data sets have stabilized and major changes to them are not predicted. Therefore, product version numbers are not necessarily incremented because of ancillary data set deliveries.
As MISR continues to reprocess the data products, Collections of scientifically consistent sets of data product versions become available. Collections may contain multiple format, production, and ESDT Versions.