A full list of the ERS-1 SAR data products available, and their characteristics, is provided here. These include:
RAW, IMP and SLC data are provided in CEOS format produced using the ESA PGS-ERS processor. All products can be provided in an ENVISAT product format, provided by the ESA PF-ASAR processor. The product specification for ERS products supplied in an ENVISAT product format is described here.
A full listing of ERS-1 products is available in the EOLI catalogue (the Client for browsing the catalogue can be downloaded here).