The special NPOC pages 
, maintained by swisstopo and the Remote Sensing Laboratories of the Geography Department at the University of Zürich, provide the relevant information.
Satellite Images World Wide
The National Point of Contact for Satellite Images NPOC provides world wide images of all types.
Contact
Swiss Federal Office of Topography
NPOC
Seftigenstr. 264
CH-3084 Wabern
Tel. +41 31 963 22 52
Fax +41 31 963 24 59
E-Mail to NPOC