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MOD10C2 and MYD10C2 Local Snow Cover Attributes, Version 5

Local attributes describe the data and provide summary data on the results of the snow cover algorithm. Two types of local attributes are reported: HDF predefined, and custom local attributes.

HDF Predefined Local Attributes

Attribute Name
Reserved Label
Definition
Sample Value
Label long_name Long name of the Science Data Set (SDS). Snow_covered_land
Unit units SI units of the data, if any 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 Max and min values within a selected data range 0, 100
Fill Value _FillValue Data used to fill gaps in the swath 255


Custom Local Attributes for the Eight_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
237 = inland water lake or inland water
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
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 Eight_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
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 Eight_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  
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
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 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
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 1.

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