Remote Sens. 2014, 6, 6183-6220; doi:10.3390/rs6076183 OPEN ACCESS remote sensing ISSN 2072-4292 www.mdpi.com/journal/remotesensing Review Open Access Data in Polar and Cryospheric Remote Sensing Allen Pope 1,2,3,*, W. Gareth Rees 3, Adrian J. Fox 4 and Andrew Fleming 4 1 National Snow and Ice Data Center, University of Colorado, 1540 30th Street, Boulder, CO 80303, USA 2 Earth Science Department, HB 6105 Fairchild Hall, Dartmouth College, Hanover, NH 03755, USA 3 Scott Polar Research Institute, University of Cambridge, Lensfield Road, Cambridge CB2 1ER, UK; E-Mail:
[email protected] 4 British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK; E-Mails:
[email protected] (A.J.F.);
[email protected] (A.F.) * Author to whom correspondence should be addressed; E-Mail:
[email protected]; Tel.: +1-303-492-9077; Fax: +1-303-492-2468. Received: 25 March 2014; in revised form: 19 June 2014 / Accepted: 19 June 2014 / Published: 1 July 2014 Abstract: This paper aims to introduce the main types and sources of remotely sensed data that are freely available and have cryospheric applications. We describe aerial and satellite photography, satellite-borne visible, near-infrared and thermal infrared sensors, synthetic aperture radar, passive microwave imagers and active microwave scatterometers. We consider the availability and practical utility of archival data, dating back in some cases to the 1920s for aerial photography and the 1960s for satellite imagery, the data that are being collected today and the prospects for future data collection; in all cases, with a focus on data that are openly accessible.