Level-2 Product Definition

The Level-2 TSA product files are provided in netCDF format, with contents as defined in Tables 1, 2, and 3. Each data variable of the processed data in Table 1 holds conventional attributes following NetCDF Climate and Forecast Metadata Conventions Version 1.7 (CF-1.7) or above as given in Table 2. Some global attributes of the Level-2 product files are given in Table 3.

See also

Refer to the Annex for a sample run demonstrating the processing sequence to create the L2 TSA product files (see Jupyter Notebook).

Table 1 NetCDF Group: Processed Data.

Variable name	Description	Units	Dimension
tsa	Terrestrial snow area (TSA)	1	(nx,ny)
tsa_uncertainty	Confidence of detected TSA	1	(nx,ny)
status_flag	Flag indicating pixel status	n/a	(nx,ny)
crs	Coordinate reference system (CRS) of the TSA product	n/a	n/a
lat	Latitudes of pixel centres according to CRS	degrees North	(nx,ny)
lon	Longitudes of pixel centres according to CRS	degrees East	(nx,ny)
x	x-Coordinate of the CRS	m	(nx)
y	y-Coordinate of the CRS	m	(ny)

Note

The CIMR Level-2 TSA product are gridded files. The dimensions of each variable in the Level-2 file refer to the (nx,ny) dimensions of the product grid, i.e. EASE-Grid 2.0 NH polar projection.

Table 2 Standard variable attributes.

Name	Description
standard_name	Sandard name referencing the description of a variable’s content
long_name	Descriptive name indicating a variable’s content
fill_value	Value indicating missing or undefined data
units	Unit of measure

Table 3 Global attributes.

Name	Description
title	CIMR L2 Terrestrial Snow Area
processing_level	Level-2
time_coverage_start	Valid start time of the product
time_coverage_end	Valid end time of the product
area	Northern Hemisphere