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MOD10A2 and MYD10A2 Local (Snow Cover) Attributes

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(s) Definition Sample Value
Label long_name Long name of the 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 0-254
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 Nominal cell area 0.21
Max_snow_area Estimated area covered by snow 445772.2
Cloud_cover_area_pct Percentage of cloud in the tile 5
Key Key to interpretation of coded integers 200 = snow
100 = lake ice
50 = cloud
39 = ocean
37 = inland water
25 = land
11 = night
4 = erroneous data
3 = beyond 45 degree scan angle
1 = missing data
0 = no decision

Custom Local Attributes for the Eight_Day_Snow_Cover field

Attribute Name Definition Sample Value
n_cells_8_snow Number of cells labeled as snow 1.98433e+006
n_cells_8_mixed Number of cells labeled as mixed 4.40522e+006
n_cells_8_cloud Number of cells labeled as cloud 831850
n_cells_8_fill Number of fill cells 0
Key day1 in bit0...day 8 in bit 7, on means snow, off means not snow