initial upload
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geomag70_linux/IGRF13.COF
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geomag70_linux/IGRF13.COF
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geomag70_linux/README.txt
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geomag70_linux/README.txt
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This zip file contains the C source code for the NGDC software "Geomag"
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version 7.0 that computes the estimated main magnetic field values for
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given locations and dates (or ranges of dates). Geomag requires a
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magnetic field model file for input. One model is included in this
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zip: IGRF13.COF. Note that the text file formats differ
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slightly in format between Unix and Windows platforms. Two different
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archives are therefore provided for Unix and Windows. The zip and tar
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files also include compiled versions (executables) of Geomag for
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Windows and Linux. This readme file contains instructions for both
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the Windows and Linux versions.
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Important notice on change of file format
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-----------------------------------------
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The file format of IGRF11.COF and forward had to be changed from the previous
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versions (IGRF10.cof and IGRF10.unx) because the previous format did not
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allow for the new 0.01 nT precision of the DGRF2005 coefficients. In this
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file format revision, we also swapped the previously confusing m,n ordering
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to the standard n,m where n is the degree and m is the order. The format
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was further adjusted to have blanks between all fields, so that values no
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longer run into each other. This makes the files easier to read using
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unformatted read statments.
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Background
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----------
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IGRF13 is the thirteenth generation standard main field model adopted
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by the International Association of Geomagnetism and Aeronomy (IAGA).
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This is a degree and order 10 model from 1900 to 1995 and a degree and
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order 13 model from 2000 to 2025, providing estimates of the main field
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for dates between January 1, 1900 and January 1, 2025. For more information
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on the IGRF and IAGA, visit the IAGA Working Group V-MOD Web site at:
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http://www.ngdc.noaa.gov/IAGA/vmod/
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The computed magnetic elements are:
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-----------------------------------
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D: Declination
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I: Inclination
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H: Horizontal field strength
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X: North component
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Y: East component
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Z: Down component
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F: Total field strength
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dD,dI,dH,dX,dY,dZ,dF: Change per year of the above quantities.
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To compile this code:
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------------------------------------
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Gnu C compiler on Unix:
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gcc geomag70.c -o geomag70.exe
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Intel C on Unix:
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icc geomag70.c -o geomag70.exe
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The Windows .exe file was generated using
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Code Gear C++ 2009 Builder
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Command line option:
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--------------------
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Note that the geomag program can receive parameters on
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the command line. For example:
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geomag70.exe IGRF13.COF 2010.32 D M133.4 10.5 10.5
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The command line syntax is listed by providing the h option as
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geomag70.exe h
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Spread-sheet option:
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--------------------
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Revision 6.1 introduced the option to read a file of
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dates and locations and create a new file with a set of extra
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columns giving the magnetic components. These can then be
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read as columns into a spread sheet program. The dates and
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coordinates have to be given in the same format as for the
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command line option. See also the sample files discussed below.
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For example:
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geomag70.exe IGRF13.COF f in-coords.txt output.txt
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will append the magnetic components and their secular
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variation to the dates and locations given in 'in-coords.txt'
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and write the result to a file 'output.txt'.
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This distribution contains example files which were produced
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on a Linux system using the commands:
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geomag70.exe IGRF13.COF f sample_coords.txt sample_out_IGRF13.txt
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To run the program with command line arguments under Windows:
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-------------------------------------------------------------
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1) Click on <Start> <Programs> <Accessories> <Command Prompt>
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2) Change directory ('cd') to the folder containg geomag70.exe
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3) Run the program, e.g. 'geomag70.exe IGRF13.COF f in.txt out.txt'
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Contact:
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--------
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For further infos, or bug reports, please contact:
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geomag.models@noaa.gov
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BIN
geomag70_linux/geomag70
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BIN
geomag70_linux/geomag70
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geomag70_linux/geomag70.c
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geomag70_linux/geomag70.c
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geomag70_linux/sample_coords.txt
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geomag70_linux/sample_coords.txt
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2019.5 D K100 70.3 30.8
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2018,10,7 D K100 70.3 30.8
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2017.5 C K6470 70.3 30.8
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2016.5 D M1042 70.3 30.8
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2015.5 D F30000 70.3 30.8
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2018.7 D F30000 -70.3 -30.8
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2018.7 D F30000 -70,18,0 -30,48,0
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2018.7 D F30000 43,22,1 -30,8,
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2018,4,7 D F30000 43,22,1 -54,36,9
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2018,2,2 D K1.3 48.123 16.123
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2019,11,19 D K1.3 48.123 16.123
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2019.8849 D K1.3 48.123 16.123
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2018,4,7 D F0 43,22,1 -54,36,9
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2015,1,1 D F30000 43,22,1 -54,36,9
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2015,1,1 D F0 0.0 0.0
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2020,1,1 D F0 0.0 0.0
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2021.5 D K12 33.0 -145.0
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2022.0 D K57 -43.0 50.0
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2023.5 D K59 32.0 163.0
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2024.5 D K26 -65.0 55.0
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geomag70_linux/sample_out_IGRF13.txt
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geomag70_linux/sample_out_IGRF13.txt
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Date Coord-System Altitude Latitude Longitude D_deg D_min I_deg I_min H_nT X_nT Y_nT Z_nT F_nT dD_min dI_min dH_nT dX_nT dY_nT dZ_nT dF_nT
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2019.5 D K100 70.3 30.8 15d 21m 79d 4m 9898.8 9546.0 2619.2 51280.9 52227.6 15.5 1.7 -16.4 -27.8 38.7 50.1 46.1
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2018,10,7 D K100 70.3 30.8 15d 9m 79d 3m 9911.0 9566.4 2590.8 51244.2 52193.8 15.5 1.7 -16.6 -27.8 38.7 50.1 46.0
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2017.5 C K6470 70.3 30.8 14d 57m 79d 11m 9737.3 9407.8 2511.7 50996.2 51917.5 15.7 1.7 -16.9 -27.9 38.5 49.6 45.5
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2016.5 D M1042 70.3 30.8 15d 27m 79d 0m 10360.4 9985.8 2760.6 53306.0 54303.5 15.5 1.7 -17.1 -29.0 40.3 53.4 49.2
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2015.5 D F30000 70.3 30.8 15d 7m 78d 58m 10343.2 9985.1 2698.4 53070.7 54069.2 15.4 1.7 -17.3 -28.9 40.1 53.2 48.9
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2018.7 D F30000 -70.3 -30.8 0d -48m -60d 20m 18895.0 18893.1 -265.0 -33161.5 38166.8 -1.9 0.8 -26.6 -26.7 -9.9 65.2 -69.8
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2018.7 D F30000 -70,18,0 -30,48,0 0d -48m -60d 20m 18895.0 18893.1 -265.0 -33161.5 38166.8 -1.9 0.8 -26.6 -26.7 -9.9 65.2 -69.8
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2018.7 D F30000 43,22,1 -30,8, -10d 20m 59d 11m 23557.7 23175.4 -4226.9 39491.8 45984.4 11.1 -3.8 39.3 52.2 68.0 -34.1 -9.1
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2018,4,7 D F30000 43,22,1 -54,36,9 -17d 3m 63d 46m 21707.6 20753.6 -6364.8 44063.0 49119.9 9.9 -5.8 48.5 64.6 45.6 -90.2 -59.4
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2018,2,2 D K1.3 48.123 16.123 4d 16m 64d 31m 20952.1 20894.0 1559.0 43943.7 48683.0 8.8 1.2 5.7 1.6 53.7 52.5 49.9
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2019,11,19 D K1.3 48.123 16.123 4d 32m 64d 33m 20962.4 20896.9 1655.4 44037.9 48772.5 8.8 1.2 5.9 1.6 53.7 52.5 50.0
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2019.8849 D K1.3 48.123 16.123 4d 32m 64d 33m 20962.4 20896.9 1655.4 44037.9 48772.5 8.8 1.2 5.9 1.6 53.7 52.5 50.0
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2018,4,7 D F0 43,22,1 -54,36,9 -17d 4m 63d 46m 21808.2 20847.1 -6402.9 44255.4 49337.0 9.9 -5.8 48.7 64.9 45.9 -90.6 -59.7
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2015,1,1 D F30000 43,22,1 -54,36,9 -17d 36m 64d 5m 21550.8 20542.9 -6513.5 44357.4 49315.4 10.0 -5.8 47.9 64.6 45.6 -90.2 -60.2
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2015,1,1 D F0 0.0 0.0 -5d 26m -29d 43m 27672.5 27548.0 -2622.4 -15793.3 31862.2 9.4 -4.6 -8.7 -1.6 76.1 -43.8 14.2
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2020,1,1 D F0 0.0 0.0 -4d 39m -30d 6m 27631.1 27540.0 -2241.9 -16012.5 31935.5 10.1 -3.0 -14.4 -7.9 81.8 -23.7 -0.5
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2021.5 D K12 33.0 -145.0 12d 21m 52d 29m 24891.2 24315.0 5324.8 32425.7 40877.8 -2.9 1.5 -54.4 -48.7 -32.2 -41.8 -66.3
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2022.0 D K57 -43.0 50.0 -47d 24m -62d 57m 16770.7 11352.8 -12343.8 -32855.1 36887.8 -8.4 -1.3 23.0 -14.8 -44.7 -76.6 78.7
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2023.5 D K59 32.0 163.0 0d 20m 43d 4m 28172.8 28172.4 163.8 26326.0 38558.7 -2.1 -1.7 27.7 27.8 -17.2 0.6 20.7
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2024.5 D K26 -65.0 55.0 -62d 32m -65d 41m 18707.9 8630.1 -16598.5 -41409.3 45439.1 -10.1 -0.1 8.0 -45.0 -32.3 -21.1 22.5
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81920
geomag70_linux/stt1d_tri_cen.txt
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geomag70_linux/stt1d_tri_cen.txt
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81920
geomag70_linux/stt1d_tri_cen_IGRF_in.txt
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geomag70_linux/stt1d_tri_cen_IGRF_in.txt
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81921
geomag70_linux/stt1d_tri_cen_IGRF_out.txt
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81921
geomag70_linux/stt1d_tri_cen_IGRF_out.txt
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geomag70_linux/tmp
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geomag70_linux/tmp
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geomag70_linux/tmp.cpp
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geomag70_linux/tmp.cpp
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#include "string"
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#include "iostream"
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#include "fstream"
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#include "iomanip"
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using namespace std;
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int main(int argc, char const *argv[])
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{
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ifstream fin("stt1d_tri_cen.txt");
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ofstream fout("stt1d_tri_cen_IGRF_in.txt");
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double lon, lat;
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for (size_t i = 0; i < 81920; i++)
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{
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fin >> lon >> lat;
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if (lon < -180) lon = 180;
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if (lon > 180) lon = 180;
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if (lat < -90) lat = -90;
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if (lat > 90) lat = 90;
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fout << "2019,8,22 D K250 " << setprecision(12) << lat << " " << lon << "\n";
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}
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fin.close();
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fout.close();
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return 0;
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}
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