MOD29 and MYD29 Local Sea Ice Attributes, Version 5

Local attributes describe the data and provide summary information about the results of the sea ice 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 Scinetific Data Set (SDS).	Sea ice by reflective characteristics
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	cartesian
Range	valid_range	Maximum and minimum values of valid data.	0,254
Fill Value	_FillValue	Data used to fill gaps in the swath	255
Calibration	scale_factor	Value by which each data element is to be multiplied. (Ice Surface Temperature (IST) only).	0.01
	scale_factor_err	Error induced by scaling. (IST only).	0.0
	add_offset	Value to add to each array element. (IST only).	0.0
	add_offset_err	Error induced by offset. (IST only).	0.0
	calibrated_nt	HDF data types of the calibrated data. (IST only).	5 (float 32)

Custom Local Attributes for the Sea Ice by Reflectance Field

Attribute Name	Definition	Sample Value
Key	Key to the meaning of the coded integers within the SDS.	Value Description 0 = missing data L1B data missing 1 = no decision no decision 11 = night darkness, terminator, or polar 25 = land snow-free land 37 =inland water lake or inland water 39 = ocean open water 50 = cloud cloud obscured 100 = lake ice snow-covered lake ice 200 = sea ice snow-covered sea ice 254 = detector saturated detector saturated 255 = fill fill
Nadir_data_resolution	Nominal spatial resolution of the pixels at nadir.	1 km
Valid EV Obs Band 2 (%)	Percentage¹ of valid observations from Level 1B in Band 2 of the swath.	77.83251
Valid EV Obs Band 4 (%)	Percentage¹ of valid observations from Level 1B in Band 4 of the swath.	77.83248
Valid EV Obs Band 6 (%)	Percentage¹ of valid observations from Level 1B in Band 6 of the swath.	77.709114
Saturated EV Obs Band 2 (%)	Percentage¹ of saturated observations from Level 1B in Band 2 of the swath.	0.0
Saturated EV Obs Band 4 (%)	Percentage¹ of saturated observations from Level 1B in Band 4 of the swath.	0.0
Saturated EV Obs Band 6 (%)	Percentage¹ of saturated observations from Level 1B in Band 6 of the swath.	0.0

¹ These percentages are based on the total number of pixels in the swath (x dimensions * y dimensions).

Custom Local Attributes for the Ice Surface Temperature Field

Attribute Name	Definition	Sample Value
Key	Key to the meaning of the scaled values within the SDS.	Value Description 0.0 = missing data L1B data missing 1.0 = no decision no decision 11.0 = night darkness, terminator, or polar 25.0 = land snow-free land 37.0 = inland water lake or inland water 39.0 = open ocean open water 50.0 = cloud cloud obscured 243.0 - 273.0 = expected Ice Surface Temperature (IST) range   655.35 = fill fill
Valid EV Obs Band 31	Percentage of valid observations from level 1B in band 31 in the swath.	100.0
Valid EV Obs Band 32	Percentage of valid observations from level 1B in band 32 in the swath.	100.0
Saturated EV Obs Band 31	Percentage of saturated observations from level 1B in band 31 in the swath.	0.0
Saturated EV Obs Band 32	Percentage of saturated observations from level 1B in band 32 in the swath.	0.0

Custom Local Attributes for the Sea Ice by Reflectance Pixel QA Field

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

Custom Local Attributes for the Ice Surface Temperature Pixel QA Field

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

Custom Local Attributes for the Latitude Field

Attribute Name	Definition	Sample Value
Source	Where the geolocation information came from.	MOD03 geolocation product; data read from center pixel in 5 km box.

Custom Local Attributes for the Longitude Field

Attribute Name	Definition	Sample Value
Source	Where the geolocation information came from.	MOD03 geolocation product; data read from center pixel in 5 km box.