The envisat product reader api is a set of c-source code files supporting developers who want to use meris, aatsr, and asar data products of the esa envisat satellite in their software.

the main use case for the c api is the ingestion of envisat data into
* new scientific algorithms developed for the meris, aatsr or asar
sensors or even all of them,
* existing scientific software packages written in c or c++, or cots
software systems which allow for extension using a c or c++
interface.