Instructions for ~rmaddale/bin/getForecastValues
Ronald J Maddalena
September 9, 2014
getForecastValues -- Returns either Opacities, Tsys_atm, Tatm, or Rest for a
list of frequencies and MJD's or a list of polynomial
coefficients that can then be used to generate values. Uses
polynomial fits which are archived once per hour by the CLEO
forecast utilities. The results are generated much faster
than when using the full-blown cleo forecasts programs,
though there is a small loss of accuracy over that provided
by cleo forecasts. The archive goes back to 5 May 2004 and
extends to up to 7 days into the future.
SYNOPSIS
getForecastValues [-h | -help]
[-type
Opacity|Tatm|AtmTsys|Tsys|TotalTsys|Est|Rest|Trcvr|Tau0|Tatm0]
[-timeList listMJDs] [startTime mjd] [stopTime mjd] [incrTime mjd]
[-freqList listGHz] [startFreq GHz] [stopFreq GHz] [incrFreq GHz]
[-elev elevation] [-dir path] [-coeff] [-debug]
DESCRIPTION
If -coeff is NOT specified:
Returns a list of time and frequency-stamped values using the polynomial
coefficients found as subdirectories of ~rmaddale/Weather. The values
in these files are calculated hourly by the CLEO forecasting package
from the average of the three local town forecasts.
The returned values will be interpolated between the nearest time stamps
in the archived coefficient data. The output will be multiple lines,
each line will give the quantities 'type' (Opacity, Tsys, Tatm, or
Rest, ...), followed by the frequency and MJD of the calculated value
within parentheses, an equal sign, and then the calculated value.
For example:
Opacity(115.45,54553.8158912) = -9999
Opacity(22.2,54553.8158912) = 0.185762649207
Opacity(30.0,54553.8158912) = 0.113792336834
Opacity(45.0,54553.8158912) = 0.270589812026
If a value cannot be calculated (either the users supplied a frequency or
time stamp that is not covered by the archive, or there is a hole > 4 hrs
in the archive for the desired time stamp), -9999 will be returned.
If -coeff is specified:
Returns a list of coefficients so that the user can then calculate their
own values at any frequency. The returned values will be interpolated
between the nearest time stamps in the archived coefficient data. The
output will be multiple lines, each line will give the quantities 'type'
(Opacity, Tsys, Tatm, or Rest), followed by the MJD of the calculated
value within parentheses, an equal sign, and then a TCL list. The list
will have three sublists, one for each of three frequency bands. Each
sublist will itself contain a list of polynomial coefficients that are to
be used in that lists band, followed by thechi square of the fit.
For example:
# Frequency Bands: 6 - 22.2, 22.2 - 50, 67 - 116, in GHz
Opacity(55088.6778935) = {{0.1253202697 -0.04723900904 0.006761806394
-0.0004079950568 9.012215005e-06} 6.053071176e-06
{3.519785243 -0.3868765402 0.01625918622 -0.0003067177559
2.209766347e-06} 0.000106007689 {2109.17448 -141.386304
3.940260533 -0.05841611896 0.0004858081949 -2.14846586e-06
3.947017435e-09} 7.022269956e-05}
If coefficients cannot be found (probably because time stamp is not
covered by the archive or there is a hole > 4 hrs in the archive),
coefficients and chi squares of -9999 will be returned.
UNITS
Output units for the generated quantities are:
Kelvin
: System Temperature, Atmosphere Temperature, Rest,
Receiver Temperature
Nepers/Air Mass : Opacity
OPTIONS
The user can use default options by not specifying any command-line
arguments or supply values to the following arguments:
-h or -help
Brings up this help page and all other options are ignored
-coeff
Whether
coefficients, and not values, are to be returned. The default
is to supply values. Only available for -types of Opacity or Tatm
-typeList list
A list of the types of the values to be returned (Default: Opacity).
Opacity: the total zenith opacity
Tatm: the opacity-weighted (i.e., representative) temperature of
the atmosphere and is the value that should be used when
fitting traditional tipping curves.
AtmTsys: the part of the system temperature due to just the
atmosphere, doesn't include CMB, spillover, and electronics,
and is calculated for the specified elevation.
Tsys: Deprecated -- the same as AtmTsys
TotalTsys: the above-described Tsys value, augmented by an
estimate of the contributions from the receiver, spillover,
and the CMB.
Est: the Effective System Temperature for the specified elevation.
Rest: the Relative Effective System Temperature, which includes
the contributions from the CMB, spillover, and electronics,
and is calculated for the specified elevation.
Trcvr: An estimate of the receiver temperature for the given
frequency and MJD
Tau0: The best possible opacity for the given frequency and MJD
Tau10, Tau25, Tau50, Tau75, Tau90: The opacity for various
percentile weather conditions for the given frequency and MJD,
based on multi-year statistical studies.
Tatm0: The Tatm for the given frequency and MJD at the time of the
best possible opacity.
Tatm10, Tatm25, Tatm50, Tatm75, Tatm90: The Tatm for various
percentile weather conditions for the given frequency and MJD,
based on multi-year statistical studies.
-elev deg
The elevation, in degrees, to use for Tsys, TotalTsys, Est and REST
calculations. Ignored for all other calculations. Default
is 30 deg.
-freqList list
List of frequencies in GHz that can range from 6 to 116 GHz.
Ignored if -coeff is specified
-startFreq, -stopFreq, incrFreq
Alternatively, one can enter a start, stop frequency and a frequency
increment, all in GHz. These are ignored if freqList or -coef is
specified. Defaults are 6, 116, and 1 GHz
-timeList list
List of MJD's. Default is the current time. Must be between
5 May 2004 and within two hours of the last entry in the archive,
which is usually the current hour.
-startMJD, -stopMJD, incrMJD
Alternatively, one can enter a start, stop time and a time increment,
all specified as MJD's These are ignored if timeList is specified.
Default is the current time and 0.04166666 (i.e., 1 hr).
-dir path
Optional path to the database files. Normally, this is not needed
since the default path usually points to the best dataset.
-debug
Turns on debugging