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.