_. EAI-TR-84-OO3A PROCESSINGANDDISPLAY i OFATMOSPHERICPIIENOMENADATA e NASAFINAL REPORT CONIRACTNAS8-33818 Prepared for National Aeronautics and Space Administration George C. Marshall Space Flight Center Marshall Space Flight Center, Alabama 35812 Prepared by Frank B. Tatom Robert A. Garst lynn R. Purser i October 1984 i ENGI NEERI NG ANALYS I S, I N C, _. 2109 Clinton Ave. W., Suite 432 ...... Huntsville, Alabama 35805 (205)533-9391 __ ,3 brought to you by CORE View metadata, citation and similar papers at core.ac.uk provided by NASA Technical Reports Server
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_. EAI-TR-84-OO3A
PROCESSINGAND DISPLAY
i OF ATMOSPHERICPIIENOMENADATA e
NASAFINAL REPORT
CONIRACTNAS8-33818
Prepared for
National Aeronautics and Space AdministrationGeorge C. Marshall Space Flight Center
Marshall Space Flight Center, Alabama 35812
Prepared by
Frank B. TatomRobert A. Garst
lynn R. Purseri
October 1984
i
E N G I N E E R I N G A N A L Y S I S, I N C,
_. 2109 Clinton Ave. W., Suite 432 ......Huntsville, Alabama 35805
(205)533-9391
__ ,3
1985002167
https://ntrs.nasa.gov/search.jsp?R=19850002167 2020-03-20T21:40:21+00:00Zbrought to you by COREView metadata, citation and similar papers at core.ac.uk
I INTRODUCTION............................................. i
2 REFINEMENTSTO THE PEC PROGRAM........................... 2
2.1 Precise Derivative for Hoop Potential ............... 2_ 2.2 Corner Point Calculation Method ..................... 5
3 APPLE III GRAPHICSPROGRAM............................... 6
3.1 The North Alabama LLP Data Acquisition and DisplaySystem .............................................. 7
3.2 Oklahoma LI.P Data Acquisition and Display System .... 7
4 NSSL LIGHTNING DATA PROGRAM.............................. 9
5 DATA REDUCTIONPROCEDURES................................ 13
5.1 Work with Spectrometer Data ......................... 135.2 Implementation of Filtering Methods ................. 135.3 Work with Low-Gain OPS Data ......................... 135.4 Sorting Program ..................................... IS
6.1 Least Square Program ................................ 156.2 Work on Latitude-Longitude Conversion Program ....... 156.3 Programs for Data Conversion to Apple III Pascal ....
qallows the user to separate the data into three additional files according
to first return, subsequent strikes, and a collector file.
i
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6. UTILLT: i_'&OGRAMS
In conjunction with the various software development efforts
described in the preceding sections, several general-purpose programs were
developed as discussed in the subsections which follow.
6.1 LEAST SQUARE PROGRAMo
A program was developed to calculate and plot, for a set of x-y
i data points, a curve based on the least squares method. The program
contained certain special features as follows:
1) the ability to read any user-specified data file,
2) the ability to calculate equations of higher degree (up to
sixth degree), and
3) the capability of user-specified x- and y-axis labeling.
_, 6.2 WORK ON LATITUTDE-LONGITUDE CONVERSION PROGRAM
A previously provided latitude-longitude conversion program was
adapted to handle several specific map projections of north Alabama and its
surrounding area. The x-y coordinate system upon which the program is based
was correlated to the x-y coordinate system of one of the digitized maps,
thereby permitting the conversion of a given latitude and longitude position
to its proper x-y coordinate position on the digitized map, and vice versa.
?
6.3 PROGRAMS FOR DATA CONVERSION TO APPLE Ill PASCAL
i Many of the data files on the HP IO00-F are stored in binary andfixed-length random access files. In order to transfer the data to another
system, a program was written to read the data and convert to a non-binary
variable-length sequential access file on the HP IO00-F. The resultant
files are available to be transferred (in ASCII form only) through remotej accessing to an Apple Ill microcomputer. An additional general-purpose
Pascal program was written which
i) reads the data from the ASCII file,
I ,
1985002187-018
2) determinesthe numberof columnsof dataand the classi-
_:i ficationas to the type and form of data: integer,real[_ (floatingpoint),or real (scientificnotation),and
3) transfers each type of data from its ASCII representation into
a Pascaldata file.
w,..
1985002167-019
!7. REFERENCES
1. Garst, Robert A., and Frank B. latom, "Potential in an ElectrostaticCloud Model, User's i.,o,,uai , L_,-,,.-_ _v., ..._ .........Analysis, Inc., Huntsville, Alabama-, March 1983.
2. MacMillan, William Ducan, The Theory of the Potential, DoverPublications, New York, N. Y., 1958.