Abstract:
MODIS/Terra Snow Cover Daily L3 Global 500m Grid (MOD10A1) contains snow cover and quality assurance (QA) data in HDF-EOS format along with corresponding metadata. Data files after 14 September 2003 include a snow albedo array with a beta status. MOD10A1 consists of 1200 km by 1200 km tiles of 500 m resolution data gridded in a sinusoidal map projection. MODIS/Terra V004 data extend from 24 February 2000 to present. MODIS snow cover data are based on a snow mapping algorithm that employs a Normalized Difference Snow Index (NDSI) and other criteria tests. The only data available for Version 4 (V004) is the Golden Month, which is a sample of V004 data covering the time period 29 August 2002 (day of year 241) through 7 October 2002 (day of year 280). The Golden Month is only available by special request by contacting NSIDC User Services. Please note that NSIDC now has a complete series of Version 5 data, which is the highest version number now available and represents the best quality of data.
Dataset Originator/Creator:
Hall, Dorothy K, George A. Riggs, Vincent V. Salomonson
Dataset Title:
MODIS/Terra Snow Cover Daily L3 Global 500m Grid, Version 4
Dataset Release Date:
2000-09-01
Dataset Release Place:
Boulder, CO U.S.A.
Dataset Publisher:
National Snow and Ice Data Center (NSIDC)
Version:
4
Online Resource:
http://nsidc.org/data/mod10a1.html
Quality indicators for MODIS snow data can be found in the following three places: AutomaticQualityFlag and the ScienceQualityFlag metadata objects and their corresponding explanations: AutomaticQualityFlagExplanation and ScienceQualityFlagExplanation located in the CoreMetadata.0 global attributes, custom local attributes associated with each Scientific Data Set (SDS), for example, snow cover, Snow Cover PixelQA data field. These quality indicators are generated during production or in post-production scientific and quality checks of the data product. For more information on local and global attributes, go to one of the following documents: MOD10A2 and MYD10A2 Local Snow Cover Attributes, Version 5 document, and the MOD10A2 and MYD10A2 Global Attributes, Version 5 document. The AutomaticQualityFlag is automatically set according to conditions for meeting data criteria in the snow mapping algorithm. In most cases, the flag is set to either Passed or Suspect, and in rare instances it may be set to Failed. Suspect means that a significant percentage of the data were anomalous and that further analysis should be done to determine the source of anomalies. The AutomaticQualityFlagExplanation contains a brief message explaining the reason for the setting of the AutomaticQualityFlag. The ScienceQualityFlag and the ScienceQualityFlagExplanation are set after production, either after an automated QA program is run or after the data product is inspected by a qualified snow scientist. Content and explanation of this flag are dynamic so it should always be examined if present. The NASA Goddard Space Flight Center: MODIS Land Quality Assessment Web site provides updated quality information for each product. These quality indicators are generated during production or in post-production scientific and quality checks of the data product. For more information on local and global attributes, go to one of the following links:
Name:
NSIDC
USER SERVICES Phone:
+1 (303) 492-6199
Fax:
+1 (303) 492-2468
Email:
nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado City:
Boulder
Province or State:
CO
Postal Code:
80309-0449
Country:
USA
Name:
NSIDC
USER SERVICES Phone:
+1 (303) 492-6199
Fax:
+1 (303) 492-2468
Email:
nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado City:
Boulder
Province or State:
CO
Postal Code:
80309-0449
Country:
USA
DOROTHY
K.
HALL Role:
INVESTIGATOR
Contact Address:
National Aeronautics and Space Administration (NASA) Goddard Space Flight Center (GSFC)
Mail stop 614.1 City:
Greenbelt
Province or State:
MD
Postal Code:
20771
VINCE
V.
SALOMONSON Role:
INVESTIGATOR
Phone:
801-585-9492
Email:
vincent.salomonson at utah.edu
Contact Address:
University of Utah
Department of Meteorology
135 S 1460 E, Rm 809 City:
Salt Lake City
Province or State:
UT
Postal Code:
84112
Country:
US
GEORGE
A.
RIGGS Role:
INVESTIGATOR
Phone:
301-614-5650
Email:
George.A.Riggs at nasa.gov
Contact Address:
NASA Goddard Space Flight Center (GSFC)
Science Systems and Applications, Inc.
Code 614.1 City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
NSIDC
USER SERVICES Role:
TECHNICAL CONTACT
Phone:
+1 (303) 492-6199
Fax:
+1 (303) 492-2468
Email:
nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado City:
Boulder
Province or State:
CO
Postal Code:
80309-0449
Country:
USA
Creation and Review Dates
DIF Creation Date:
2003-05-21
Last DIF Revision Date:
2012-05-04
