Keyword

Function

Values

* (asterisk)

Identifies comment line.


ENDFILE

Lines following this keyword will be ignored.


TimeStart

Sets beginning time of first interpolation interval

Valid HECTime strings for date and time Example: 13JAN1995, 1100

TimeEnd

Sets ending time of last interpolation interval

Valid HECTime strings for date and time

TimeStep

Sets length of grid time interval

Numerical values in minutes.  Acceptable values are limited to 1, 5, 10, 15, 20, 30, 60, 120, 180, 240, 360, 480, 720, 1440.  Defaults to 60 minutes.

Weight

Ignored keyword in HEC-MetVue


Range

Range for extrapolationRange in meters radially from the Convex Hull of the gage network, to which extrapolation is allowed. Default is 30,000m. Cannot be used with -noExtrapolate command line argument. Note that UNLIMITED argument in GageInterp is not supported in GageToTin.

AdjustMethod

Sets the adjustment method (BIAS or LAPSE) to be applied to the output grids

BIAS can be used for most data types, including precipitation.  LAPSE can be used for temperatures only.

AdjustGridFile

DSS file containing the bias or elevation grid

DSS filename.

AdjustGridPath

Identifies DSS grid record containing bias factors or elevations for lapse

DSS pathname.  Any values in BIAS grids are acceptable.  Elevation grids must be in meters.

LapseMethod

Sets method for calculating lapse rate

FIXED, TIMESERIES, or CALCULATED

LapseRate

Sets constant lapse rate

Lapse rate in degrees C per m.  Default value is -0.0065.

LapseRateFile

Sets name of DSS file containing a time series of lapse rates

Name of existing DSS file containing the lapse rate time series.

LapseRatePath

Sets the path of the DSS record containing a time series of lapse rates.

Path name of an existing time series record containing lapse rates expressed in deg F/FT or deg C/m

Additional notes on setting interpolation parameters in the control file:

  • TimeStart and TimeEnd require a date, and may include a time.
  • The TimeStep of the grids defaults to one hour, but can be set to other values in the control file.
  • The Weight (interpolation method) is not specified in the control file and defaults to Bilinear Interpolation along triangulated gage network.
  • For the AdjustGridPath, in addition to allowing for a static DSS record pathname specification, HEC-MetVue allows for dynamic naming using two different methods:
    • Method 1: Explicit masking: /SHG2000/PRISMGRID/%MMM%_RAIN///AVERAGE/.
      • The %MMM% is a placeholder for the month name. This follows the general filename masking conventions that HEC-MetVue supports (refer to File/Path Masking Specifications).
      • When this dynamic form is used, HEC-MetVue will select the correct bias record for the simulation even when it crosses date bounds. For example, given a DSS record pathname of /SHG2000/PRISMGRID/SEP_RAIN///AVERAGE/ and the start/end times of 15Jan2009 and 15Mar2009, the program would automatically use the correct bias record for each of the three time periods of 15Jan-31Jan, 1Feb-28Feb, and 1Mar-15Mar without having to edit the bias record pathname and restart the compute for each time period.
    • Method 2: Record timespan checking: /SHG2000/PRISMGRID/*_RAIN///AVERAGE/.
      • HEC-MetVue will inspect every path in the DSS file which matches the given path mask and use the timespan defined in the related DSS records to locate the correct records for a particular time period.
      • As with the explicit masking, multiple records representing different timespans will be used as required.