ADT

Estimates tropical cyclone intensity using the Advanced Dvorak Technique.

Format

ADT [keywords]
ADT history_file [keywords]
ADT history_file DATASET=source local [keywords]
ADT AUTO format fcst_file history_file [keywords]
ADT DEL history_file DATE= [keywords]
ADT EDIT history_file day time [keywords] "comment
ADT LIST history_file [keywords]
ADT PLOT history_file [keywords]

Parameters

AUTO	allows for automated ADT estimate utilizing NHC/JTWC forecasts and Laplacian analysis to objectively determine position of storm center
DEL	deletes history file record; must be used with DATE= keyword to define date/time limits
EDIT	edits contents of history file
LIST	lists contents of history file; see the Remarks
PLOT	plots a graph of intensity estimates from history file; see the Remarks
history_file	history file to be used (default=path defined in environment variable ODTHISTORY)
format	format of forecast file; the valid options are:
	ATCF	tropical cyclone forecast records (default)
	DISC	TPC WTNT4* or WTPZ3* storm specific discussions
	PACWARN	JTWC WTPN3* tropical cyclone warning
	GENERIC	see the Remarks for example format
fcst_file	file name containing forecast information for the AUTO option; the directory location is defined by environment variable ODTAUTO (no AUTOFIX)
day	adds comment to specified day in history file
time	adds comment to specified time in history file
comment	comment to add to history file for specified day and time

Keywords

ATCF=	stormID sourceID rawT finalT produces ATCF formatted listing for current ADT estimate or entire history file, or for portion of history file as defined by DATE= keyword (default=-1 XXXX 0 0), where:
		stormID	annual tropical cyclone number and basin value, e.g., 10W, 06L; valid basin values are: L=Atlantic E=East Pacific C=Central Pacific W=West Pacific A=North Indian Ocean B=South Indian Ocean S=Australian Region (90E-135E) P=Australian Region (east of 135E)
		sourceID	WMO identifier (e.g., NHC, PGTW, etc)
		rawT	flag determining raw T number output; specify 0 or 1, where 0=adjusted raw T number, 1=unadjusted raw T number
		finalT	flag determining final T number output; specify 0 or 1, where 0=6-hour weighted average, 1=3-hour straight linear average
	the output file is created in the directory defined by the environment variable ODTOUTPUT using the naming convention CIMSS_DVTO_yyyymmddhhmm_ssbasin_FIX, where yyyy=year, mmdd=month (1-12) and day (01-31), hhmm=UTC time, ss=stormID, basin=sub basin
COLor=	CI MSLP T6hr T3hr AdjRawT UnAdjRawT 12hrAvgTIE CurrTIE outline text defines graphic color levels of the PLOT option's plotted parameters; specify 0 to omit from display (default=1 2 0 0 0 0 0 0 6 7)
DATe=	bday btime eday etime defines day and time range (from beginning day and time to ending day and time) for LIST, PLOT and DEL options; specify bday and eday in yyyymondd format (e.g., 2008SEP17) and btime and etime in hhmmss format (e.g., 131500)
DATAset=	source local source and local ADDE datasets; specify as group/descriptor.position or alias.position, where:
		source	identifies the infrared image to use as input for the ADT analysis (default=value defined by environment variable ODTLSERVE)
		local	identifies the dataset to store the subsected image; the latitude and longitude location is determined by information in history_file (default=value defined by environment variable ODTLDATA)
DOMain=	defines domain for CI to MSLP conversion; valid options are ATL or PAC; see the Remarks (default=computed)
LAND=	YES		applies ADT land interaction rule (default)
	NO		does not apply ADT land interaction rule
MAXWradius=	manually defines maximum wind radius in km; if the ADT estimate has determined an eye scene and a MAXW of less than 5 km is specified, the scene type will be changed to PINHOLE EYE; if a value of MAXW of greater than 45 km is specified, the scene type will be changed to LARGE EYE
OUTput=	loc file defines destination of LIST option output, where:
		loc	location to send the output; valid options are T, FILE and TFILE (default=T), where: T - sends output to current text window FILE - sends output to a file TFILE - sends output to both current text window and a file
		file	directory and name of file created by FILE and TFILE options; the default filename is ODTDUMP.ASC and the directory it is written to is defined by the environment variable ODTOUTPUT
OVERride=	YES		interactively overrides the automated scene type; cannot be used with AUTO option
	NO		does not override the automated scene type (default)
RAWT=	overrides the initial raw T intensity classification value as defined by the subjective Dvorak rules; this keyword should be used only when analysis of a tropical cyclone is initiated at a time later than initial formation (storm has a raw T value greater than 1.0); if 0.0 is specified in this keyword, the value will be calculated by ADT (default=1.0)
SEARch=	YES		performs search for maximum curved band location if ADT estimate has determined a CURVED BAND scene (default)
	NO		does not perform search for maximum curved band location
WIND=	YES		use with the PLOT option to plot its intensity values as maximum wind speed in knots rather than MSLP; speed and MSLP values are derived from the empirical relationship to CI number defined in Dvorak [1984] and Shwechuck and Weir [1980]
	NO		plots the intensity values as MSLP instead of wind speed (default)

Remarks

For an overview of the ADT and an archive of ADT estimates from the CIMSS Tropical Cyclones Group, see http://tropic.ssec.wisc.edu/misc/adt/info.html. This page also contains a link to the current version of the ADT Users' Guide, which has a description of the ADT algorithm and detailed information about the ADT command and its options.

The units for pressure/wind are shown in millibars/knots for both the LIST and PLOT options. If the LIST option is used with ATCF keyword, the output file will be in fixed DVTO format.

When using the DOMAIN= keyword, ATL should be used for storms within the North Atlantic basin, while PAC should be used for storms within the Western Pacific basin. Domain selection will affect Raw T intensity estimates and corresponding CI pressure values (empirical CI number/pressure relationship).

Examples

ADT

This entry uses the current displayed image and current cursor location to perform an abbreviated ADT analysis. No time averaging or any other application will be performed. Output will be displayed in the current text frame and no history file will be written.

ADT KATRINA RAWT=6.0

This entry uses the current displayed image and current cursor location to perform a full ADT analysis with the initial intensity classification of 6.0. The output will be displayed in the current text frame and written to the file KATRINA.ODT.

ADT AUTO DISC katrina2005.280300.txt KAT05.ODT RAWT=0.0

This entry performs an automated full ADT analysis using the currently displayed image, and the initial intensity classification will be calculated. The storm center position will be read from the forecast product file, katrina2005.280300.txt. The output will be displayed in the current text frame and written to the file KAT05.ODT.

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