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MOD10A1 and MYD10A1 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: Hierarchical Data Format (HDF) predefined and custom local attributes.

HDF Predefined Local Attributes

Attribute Name
Reserved Label(s)
Definition
Sample Value
Label long_name Long name of the Scientific Data Set (SDS). Snow cover extent by best observation of the day
Unit units International System of Units (SI) of the data. None
Format format How the data should be viewed in Fortran format notation. I3
Coordinate system coordsys Coordinate system to use for the data. Cartesian
Range valid_range Maximum and minimum values within a selected data range. 0, 254
Fill Value _FillValue Data used to fill gaps in the grid. 255
Calibration scale_factor
scale_factor_err
add_offset
add_offset_err
calibrated_nt		 Not used. Not used


Custom Local Attributes for the Snow_Cover_Daily_Tile Field

Attribute Name
Definition
Sample Value
missing_value Coded integer used to indicate missing data. 0
Key Key to the meaining of the coded integers within the SDS.
Value
Description
0 = missing data
data missing
1 = no decision
no decision
11 = night
darkness, terminator, or polar night
25 = no snow
snow-free land
37 = lake
lake or inland water
39 = ocean
open water
50 = cloud
cloud obscured
100 = lake ice
snow-covered lake ice
200 = snow
snow-covered land
254 = detector saturated
detector saturated
255 = fill
fill


Custom Local Attributes for the Snow_Spatial_QA Field

Attribute Name
Definition
Value
Key Explanation of the QA Flag. 0 = good quality
1 = other quality
252 = Antarctica mask
253 = land mask
254 = ocean mask
255 = fill


Custom Local Attributes for the Snow_Albedo_Daily_Tile Field

Attribute Name
Definition
Sample Value
missing_value Coded integer used to indicate missing data
-6
Key Key to the meaining of the coded integers within the SDS.
Value
Description
0-100 = snow albedo
in percent
101 = no decision
no decision
111 = night
darkness, terminator, or polar night
125 = land
snow-free land
137 = inland water
lake or inland water
139 = ocean
open water
150 = cloud
cloud obscured
250 = missing
data missing
251 = self_shadowing
self shadowing
252 = landmask mismatch
landmask mismatch
253 = BRDF_failure
Bidirectional Reflectance Distribution Function failure
254 = non-production_mask
non-production mask


Custom Local Attributes for the Fractional_Snow_Cover Field

Attribute Name
Definition
Value
Description
Key Key to the meaining of the coded integers within the SDS. 0-100 = fractional snow in percent
200 = missing data data missing
201 = no decision no decision
211 = night darkness, terminator, or polar night
225 = land snow-free land
237 = inland water lake or inland water
239 = ocean open water
250 = cloud cloud obscured
254 = detector saturated detector saturated
255 = fill fill

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