Estimation of snow pack characteristics and snow covered area in boreal forests from ERS-2 SAR and Envisat ASAR data. - Jouni Pulliainen; Kari Luojus; Martti Hallikainen; Sari Metsämäki; Jarkko Koskinen; Juha-Petri Kärnä; Markus Huttunen; Sirpa Rasmus (IGARSS, 2004)