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98 lines
2.6 KiB
98 lines
2.6 KiB
#!/usr/bin/env python |
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''' |
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generate field tables from IGRF12 |
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''' |
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import pyigrf12 as igrf |
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import numpy as np |
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import datetime |
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import os.path |
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import sys |
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from math import sqrt, pi, atan2, asin |
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if not os.path.isfile("AP_Declination.h"): |
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print("Please run this tool from the AP_Declination directory") |
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sys.exit(1) |
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def field_to_angles(x, y, z): |
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intensity = sqrt(x**2+y**2+z**2) |
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r2d = 180.0 / pi |
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declination = r2d * atan2(y, x) |
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inclination = r2d * asin(z / intensity) |
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return [intensity, inclination, declination] |
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isv = 0 |
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date = datetime.datetime.now() |
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itype = 1 |
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alt = 0.0 |
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SAMPLING_RES = 10 |
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SAMPLING_MIN_LAT = -90 |
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SAMPLING_MAX_LAT = 90 |
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SAMPLING_MIN_LON = -180 |
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SAMPLING_MAX_LON = 180 |
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NUM_LAT = 1 + (SAMPLING_MAX_LAT - SAMPLING_MIN_LAT) / SAMPLING_RES |
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NUM_LON = 1 + (SAMPLING_MAX_LON - SAMPLING_MIN_LON) / SAMPLING_RES |
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intensity_table = np.empty((NUM_LAT, NUM_LON)) |
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inclination_table = np.empty((NUM_LAT, NUM_LON)) |
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declination_table = np.empty((NUM_LAT, NUM_LON)) |
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for i in range(NUM_LAT): |
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for j in range(NUM_LON): |
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lat = SAMPLING_MIN_LAT + i*SAMPLING_RES |
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lon = SAMPLING_MIN_LON + j*SAMPLING_RES |
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x, y, z, f, d = igrf.gridigrf12(date, isv, itype, alt, lat, lon) |
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intensity, I, D = field_to_angles(x, y, z) |
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intensity_table[i][j] = intensity * 0.00001 |
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inclination_table[i][j] = I |
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declination_table[i][j] = D |
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tfile = open("tables.cpp", 'w') |
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tfile.write('''// this is an auto-generated file from the IGRF tables. Do not edit |
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// To re-generate run generate/generate.py |
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#include "AP_Declination.h" |
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''') |
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tfile.write(''' |
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const float AP_Declination::SAMPLING_RES = %u; |
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const float AP_Declination::SAMPLING_MIN_LAT = %u; |
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const float AP_Declination::SAMPLING_MAX_LAT = %u; |
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const float AP_Declination::SAMPLING_MIN_LON = %u; |
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const float AP_Declination::SAMPLING_MAX_LON = %u; |
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''' % (SAMPLING_RES, |
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SAMPLING_MIN_LAT, |
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SAMPLING_MAX_LAT, |
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SAMPLING_MIN_LON, |
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SAMPLING_MAX_LON)) |
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def write_table(name, table): |
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'''write one table''' |
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tfile.write("const float AP_Declination::%s[%u][%u] = {\n" % |
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(name, NUM_LAT, NUM_LON)) |
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for i in range(NUM_LAT): |
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tfile.write(" {") |
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for j in range(NUM_LON): |
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tfile.write("%.5f" % table[i][j]) |
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if j != NUM_LON-1: |
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tfile.write(",") |
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tfile.write("}") |
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if i != NUM_LAT-1: |
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tfile.write(",") |
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tfile.write("\n") |
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tfile.write("};\n\n") |
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write_table('declination_table', declination_table) |
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write_table('inclination_table', inclination_table) |
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write_table('intensity_table', intensity_table) |
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tfile.close()
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