Filling Out the Uniformly Sampled Class
The <Uniformly_Sampled> class can be used in any table-type class (like <Table_Character>) when the table contains records which are uniformly spaced in some dimension (time, wavelength, distance, etc.). This class is used to define that dimension and interval rather than including an additional field in each row to hold the value explicitly.
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For additional explanation, see the PDS4 Standards Reference, or contact your PDS node consultant.
Following are the attributes and subclasses you'll find in <Uniformly_Sampled>, in label order.
Note that in the PDS4 master schema, all classes have capitalized names; attributes never do.
Contents
<sampling_parameter_name>
REQUIRED
The name of the dimension of sampling (wavelength, time, etc.)
<sampling_parameter_interval>
REQUIRED
Distance between records in units of the sampling parameter. So if you're sampling in time, the interval might be 100 milliseconds, for example.
<sampling_parameter_unit>
REQUIRED
The unit associated with the sampling_parameter_interval.
<first_sampling_parameter_value>
REQUIRED
The value of the sampling parameter at the point where the data of the first record were recorded.
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<last_sampling_parameter_value>
REQUIRED
The value of the sampling parameter at the point where the data of the last record were recorded. Also see the yellow box warning under first_sampling_parameter, above.
<sampling_parameter_scale>
OPTIONAL
This is actually the type of the scale. It must be one of the standard values Exponential, Linear, or Logarithmic. In the anscence of a <sampling_parameter_scale>, you can safely assume the scale is linear. If you use this value for one table in your product, though, you should use it for all of them.