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Data Usage Guidance/Restrictions
The operational data for this datatype is available to all registered CLASS users. Pre-operational data may be restricted to authorized users. To become an authorized user, send a request to the CLASS Help Desk.
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Output
User option for the format of the output file. The valid formats are:
- Plotted image GIF
- Generic ASCII file
- Spreadsheet
- Tab-delimited file
- Comma-delimited file
- NetCDF file
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Spatial
Refers to the geographic area of interest to the user. This section of the search page allows the user to define the geographic area of interest.
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Temporal
Refers to the time span of interest to the user. This section of the search page allows the user to define the range of dates/times of interest.
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UTC
Coordinated Universal Time (UTC) is the international time standard. It is the current term for what was referred to as Greenwich Meridian Time (GMT). Zero (0) hours UTC is midnight in Greenwich England, which lies on the zero longitudinal meridian. Universal time is based on a 24 hour clock, therefore, afternoon hours such as 4 pm UTC are expressed as 16:00 UTC (sixteen hours, zero minutes).
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Variables
User option for values in the output file. The valid options for values for each file are:
- Analysis Temperature - The latest sea surface temperature calculated based on the previous analysis temperature, weighted according to its reliability, combined with a weighted average of current observations within a surrounding area of the gridpoint. The surrounding area is determined according to the gradient in each direction.
- Average Gradient - The average of the gradients in all four directions (N, S, E, W) from the grid intersection.
- Climatological Temperature - The average sea surface temperature of a grid intersection for a particular month over a number of years, taken from the global climatology file.
- Gradient in X- Direction - Change in temperature in the negative direction along the X axis.
- Gradient in X+ Direction - Change in temperature between the grid point and neighbor points within the field in the positive direction along the X axis.
- Gradient in Y- Direction - Change in temperature in the negative direction along the Y axis.
- Gradient in Y+ Direction - Change in temperature in the positive direction along the Y axis.
- Spatial Covariance X- - The distance in grid units from the grid intersection to the nearest land mass in the negative direction along the X axis.
- Spatial Covariance X+ - The distance in grid units from the grid intersection to the nearest land mass in the positive direction along the X axis.
- Spatial Covariance Y- - The distance in grid units from the grid intersection to the nearest land mass in the negative direction along the Y axis.
- Spatial Covariance Y+ - The distance in grid units from the grid intersection to the nearest land mass in the positive direction along the Y axis.
- Age of Most Recent Observation - The age, in hours before the time of the analysis, of the most recent observation used to determine the new temperature for a grid intersection.
- Class 1 Temporal Coverage - Set of bits (0-15) of which Bit 1 is set to 1 for each analysis which included observations with a reliability greater than or equal to a specific minimum reliability considered as Class 1. Bit 0 always remains a 0, and all bits are shifted right during each analysis leaving Bit 1 to 0 when no Class 1 reliability observations are used for a grid intersection.
- Number of Observations - The total number of current observations used in the analysis of the new temperature for the grid intersection.
- Physiographic Descriptor - The land/sea tag indicating whether a grid intersection is a land or sea point.
- Reliability - New reliability associated with the new temperature, based on the previous reliability combined with the weighted reliability of all observations used in the last analysis. Larger values are more reliable.
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