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.