MOD10C1 and MYD10C1 Local Snow Cover Attributes, Version 5

Local attributes describe the data and provide summary information about the results of the snow cover algorithm. Two types of local attributes are reported: Hierarchical Data Format (HDF) predefined and custom local attributes.

HDF Predefined Local Attributes

Attribute Name	Reserved Label	Definition	Sample Value
Label	long_name	Long name of the Scientific Data Set (SDS).	Snow_covered_land
Unit	units	International System of Units (SI) of the data. This attribute may or may not be used.	none
Format	format	How the data should be viewed in Fortran format notation.	I3
Coordinate system	coordsys	Coordinate system to use for the data.	latitude, longitude
Range	valid_range	Maximum and minimum values within a selected data range.	0-100 for snow 0-3 for QA
Fill Value	_FillValue	Data used to fill gaps in the swath.	255

Custom Local Attributes for the Day_CMG_Snow_Cover Field

Attribute Name	Definition	Sample Value
Key	Key to the meaining of the coded integers within the SDS.	Value Description 0 -100 = percent of snow in cell   107 = lake ice snow-covered lake ice 111 = night darkness, terminator, or polar 250 = cloud obscured water   253 = data not mapped   254 = water mask   255 = fill
Mask_value	Value given to masked areas from analysis, primarily oceans.	254
Night_value	Value assigned to cells in complete darkness.	111
Cell_resolution	Approximate resolution of the Climate Modeling Grid (CMG) cells.	0.05 degrees
Water_mask_land_threshold (%)	Percentage of land in the cell to be processed as land. A cell with less than this threshold is considered ocean.	12.0
Antarctic_snow_note	Special note on Antarctica processing.	Antarctica deliberately mapped as snow

Custom Local Attributes for the Day_CMG_Confidence_Index Field

Attribute Name	Definition	Sample Value
Key	Key to the meaning of the coded integers within the SDS.	Value Description 0 -100 = confidence index value   107 = lake ice snow-covered lake ice 111 = night darkness, terminator, or polar 250 = cloud obscured water   253 = data not mapped   254 = water mask   255 = fill
Mask_value	Value given to masked areas from analysis, primarily oceans.	254
Cell_resolution	Approximate resolution of CMG cells.	0.05 degrees
Water_mask_land_threshold (%)	Percentage of land in the cell to be processed as land. A cell with less land than this threshold is considered ocean.	12.0
Antarctic_confidence_index_note	Special note on Antarctica processing.	Antarctica deliberately mapped as snow. Confidence index is set to 100.

Custom Local Attributes for the Day_CMG_Cloud_Obscured Field

Attribute Name	Definition	Sample Value
Key	Key to the meaning of the coded integers within the SDS.	Value Description 0 -100 = percent of cloud in cell   107 = lake ice snow-covered lake ice 111 = night darkness, terminator, or polar 250 = cloud obscured water   252 = Antarctic mask   253 = data not mapped   254 = water mask   255 = fill
Mask_value	Value given to masked areas from analysis, primarily oceans.	254
Not_processed_value	Value assigned to cells that were not processed.	252
Night_value	Value assigned to cells in complete darkness.	111
Cell_resolution	Approximate resolution of CMG cells.	0.05 degrees
Water_mask_land_threshold (%)	Percentage of land in the cell to be processed as land. A cell with less land than this threshold is considered ocean.	12.0
Antarctic_cloud_note	Special note on Antarctica processing.	Antarctica deliberately mapped as snow. Cloud value set to 252.

Custom Local Attributes for the Snow_Spatial_QA Field

Attribute Name	Definition	Sample Value
Key	Explanation of the 2-bit Quality Assessment (QA) Flag.	Coded Integer Value 0 good quality 1 other quality 252 Antarctic mask 253 data not mapped 254 ocean mask 255 fill
Mask_value	Value given to the masked areas from analysis, primarily oceans.	254
Cell_resolution	Approximate resolution of the CMG cells.	0.05 degrees
Water_mask_land_threshold (%)	Percentage of land in the cell to be processed as land. A cell with less land than this threshold is considered ocean.	12.0
Antarctic_QA_note	Special note on Antarctica processing.	Antarctica deliberately mapped as snow. QA value set to 252.