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MOD10A2 and MYD10A2 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(s)
Definition
Sample Value
Label long_name Long name of the Scientific Data Set (SDS) Maximum snow extent over the 8-day period
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 swath 255
Calibration scale_factor
scale_factor_err
add_offset
add_offset_err
calibrated_nt
Not used Not used


Custom Local Attributes for the Maximum_Snow_Extent Field

Attribute Name
Definition
Sample Value
Cell_area (km^2) Nominal cell area 0.21465868
Max_snow_area (km^2) Estimated area covered by snow 485125.2
Key Key to the meaining of the coded integers within the SDS.
Value
Explanation
0 = missing data
data missing
1 = no decision
no decision
11 = night
darkness, terminator, or polar
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 Eight_Day_Snow_Cover Field

Attribute Name
Definition
Sample Value
Key
Snow occurrence in chronological order. Day in period ordered as 87654321 corresponds to bit order of 76543210. Bit value of 1 means snow was observed. Bit value of 0 means snow was not observed.
Value
Explanation
0 = fill
fill


See Summary of MOD10A2/MYD10A2 Bit Values for an interpretation of bit values and resulting integer values for the Eight Day Snow Cover field.