DoD Wind Requirements

1. DoD Wind Requirements Maj Dan Pawlak Air Force Liaison to NCEP

2. DoD Wind Requirements • This…[was] provided as a comprehensive list of environmental parameters and standards for integration into the PRD for the GOES-R system design phase. • …this is the first step in the Joint Capabilities Integration and Development System (JCIDS) process to define new environmental sensing capabilities and update METOC and space requirements… • This [Functional Area Analysis] provides a list of environmental parameters or standards necessary for collection to complete DOD objectives. While this FAA does not provide DOD approved and validated requirements for Geostationary Operational Environmental Satellites (GOES), it provides insight supporting the requirements request from NOAA.

3. Impact (C, E, or D) • C = Critical for Mission Accomplishment. Not having these data will prevent performance of the mission or preclude satisfactory mission accomplishment. • E = Essential for Mission Accomplishment. Not having these data may significantly degrade force effectiveness and result in significant risk or may prevent performance of some portions of the required mission. • D = Desired for Mission Accomplishment. Not having these data may reduce force potential and result in minor risk.

4. Coverage • Horizontal Coverage: The specific area of interest for support to operations and users of identified systems. • Vertical Range (Sensing Depth): Vertical extent of the element. For example, a space-based sensor may be required to measure moisture from the surface up to 65,000 feet.

5. Resolution • Horizontal Resolution: The dimension of the smallest object, horizontal area represented by the parametric value. Spatial granularity with which information and data are provided, e.g., distance between adjacent grid points in gridded fields. Note: There is a distinct difference between resolution and grid spacing. Resolution describes the dimension of the feature, but needs about 8 grid spaces to depict adequately. • Vertical Resolution: The smallest height increment of the data. Spatial granularity in the vertical with which information and data are provided, e.g., distance between adjacent vertical grid points in a radiosonde observation. Note: There is also a difference between vertical resolution and grid spacing. • Temporal (tau): Time granularity with which forecast is provided, e.g., number of hours between forecast fields (e.g., hourly = 1 hr). Includes duration or length of time represented by forecast of the element (i.e., 0-72 hours).

6. Measurement/Specification Values • Basic unit: Unit in which specified or predicted element is stated (e.g., meters, degrees Celsius, knots). • Range: Range of parameter, within which the parameters must be measurable or reportable (e.g., temperature –40C to +50C).

7. Accuracy • Accuracy: Required accuracy of measurement expressed in the same units as the measurement or as a percent with an upper limit. This parameter represents the extent to which the reported output approaches the true value of the measured quantity. • Precision (or Reportable Increment): The amount or degree of change required in reporting the parameter value. Indicates the degree of refinement with which a measurement is stated (i.e., number of significant digits). Expressed as decimal (e.g., tenth of a degree) or whole units (e.g., every 100 feet). • Mapping Accuracy: Amount of allowable error in geo-location of measured data.

8. Time • Timeliness (or Latency): Elapsed time from data acquisition until delivery of processed data to the user. Latest time by which an element can be delivered and still be useful to the customer, expressed as duration beyond real time; lead time for warnings. • Refresh Rate: Average time interval between consecutive measurements of the same area of the environment. How often an element must be collected or forecasted per unit of time (e.g., once per day; every 15 minutes).