MEaSUREs Greenland Ice Velocity: Selected Glacier Site Velocity Maps from Optical Images Version 2 (OSU/GIMP/ICE_VELOCITY_OPT)

Version 2.0

This dataset, part of the NASA Making Earth System Data
Records for Use in Research Environments (MEaSUREs) program,
consists of mean monthly velocity maps for selected glacier outlet areas.
The maps are generated by tracking visible features between optical
image pairs acquired by the Landsat 4 and 5 Thematic Mapper (TM),
the Landsat 7 Enhanced Thematic Mapper Plus (ETM+), the Landsat 8
Operational Land Imager (OLI), and the Advanced Spaceborne Thermal
Emission and Reflection Radiometer (ASTER).


Monthly means are calculated from images, which may have acquisition
dates from the preceding or succeeding month. For the naming convention,
the month is determined from where the midpoint Julian dates fall.
For example, September monthly means may have been generated from
images that were acquired in August or in October but the midpoint
Julian date between the images falls within September. The exact
dates used are included as per-image metadata fields.

NameDescriptionGee Unit
velocity_xIce flow x velocitymeter/year
velocity_yIce flow y velocitymeter/year
error_xIce flow x errormeter/year
error_yIce flow y errormeter/year


National Snow & Ice Data Center (producer, licensor)
Google Earth Engine (host)
STAC Version 0.6.0
Keywords GIMP, NASA, OSU, arctic, greenland, ice, polar, velocity
License proprietary
Temporal Extent 2/28/1985, 4:00:00 PM - 9/29/2016, 5:00:00 PM
Citation Howat, I. 2017. MEaSUREs Greenland Ice Velocity: Selected Glacier Site Velocity Maps from Optical Images, Version 2. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: []( [Date Accessed].
Type image_collection
GSD metersm
Asset schema {"name":"CENTRAL_JULIAN_DATES","description":"List of central Julian date for image pairs used in image.","type":"STRING_LIST"},{"name":"FIRST_IMAGE_DATES","description":"List of first image dates used in image.","type":"STRING_LIST"},{"name":"NOMINAL_TIMES","description":"List of nominal observation times for pairs of images.","type":"STRING_LIST"},{"name":"PRODUCTION_DATE","description":"Production date.","type":"STRING"},{"name":"SECOND_IMAGE_DATES","description":"List of second image dates used in image.","type":"STRING_LIST"},{"name":"SENSORS","description":"List of sensor pairs used in image.","type":"STRING_LIST"}