每经度每纬度的磁偏角仅限东经北纬

这是我自己编写程序发包从美国海洋局NOAA查获的获得的每一经度每一纬度的磁偏角数据，仅查了东经北纬，日期是2010年10月，保存在数组ma[181][91]中，181代表经度，91代表纬度

	double ma[181][91]=
	{{-5.98-5.62-5.25-4.92-4.62-4.32-4.03-3.77-3.52-3.28-3.07-2.85-2.67-2.47-2.30-2.13-1.98-1.83-1.70-1.57-1.45-1.33-1.22-1.12-1.03-0.95-0.87-0.80-0.73-0.68-0.63-0.58-0.55-0.53-0.52-0.50-0.50-0.52-0.52-0.55-0.58-0.62-0.67-0.73-0.78-0.87-0.95-1.03-1.13-1.25-1.35-1.48-1.62-1.75-1.88-2.03-2.20-2.37-2.53-2.70-2.88-3.05-3.23-3.42-3.60-3.78-3.97-4.13-4.30-4.47-4.63-4.78-4.92-5.05-5.18-5.30-5.42-5.52-5.63-5.73-5.85-5.98-6.15-6.35-6.60-6.93-7.38-8.03-8.98-10.450.00}
	{-5.65-5.28-4.93-4.62-4.30-4.02-3.75-3.48-3.25-3.02-2.80-2.60-2.42-2.23-2.07-1.90-1.75-1.60-1.47-1.33-1.22-1.10-1.00-0.90-0.80-0.72-0.63-0.57-0.50-0.45-0.40-0.35-0.32-0.28-0.27-0.25-0.25-0.25-0.27-0.28-0.32-0.35-0.38-0.43-0.50-0.57-0.63-0.72-0.82-0.92-1.02-1.13-1.25-1.37-1.50-1.63-1.78-1.93-2.08-2.25-2.40-2.57-2.73-2.90-3.07-3.23-3.38-3.55-3.70-3.85-3.98-4.12-4.25-4.37-4.47-4.58-4.67-4.77-4.87-4.95-5.07-5.18-5.33-5.50-5.75-6.07-6.52-7.13-8.07-9.500.00}
	{-5.32-4.95-4.62-4.32-4.02-3.73-3.47-3.22-2.98-2.77-2.55-2.35-2.17-2.00-1.83-1.67-1.52-1.38-1.25-1.12-1.00-0.88-0.78-0.68-0.58-0.50-0.42-0.35-0.28-0.22-0.17-0.13-0.08-0.05-0.03-0.02-0.020.00-0.02-0.03-0.05-0.08-0.12-0.17-0.22-0.27-0.33-0.42-0.50-0.58-0.68-0.78-0.88-1.00-1.12-1.25-1.38-1.52-1.65-1.80-1.93-2.08-2.23-2.38-2.53-2.68-2.82-2.97-3.10-3.22-3.35-3.47-3.57-3.67-3.77-3.85-3.93-4.02-4.10-4.17-4.27-4.37-4.50-4.67-4.90-5.20-5.63-6.25-7.15-8.550.00}
	{-4.98-4.63-4.32-4.02-3.73-3.45-3.20-2.97-2.73-2.52-2.32-2.12-1.93-1.77-1.60-1.45-1.30-1.17-1.03-0.92-0.78-0.68-0.57-0.47-0.38-0.30-0.22-0.13-0.07-0.020.020.070.120.150.170.200.200.220.220.200.180.170.130.080.050.00-0.05-0.12-0.18-0.27-0.35-0.43-0.53-0.63-0.75-0.85-0.97-1.10-1.22-1.35-1.47-1.60-1.73-1.87-2.00-2.13-2.25-2.37-2.48-2.60-2.70-2.80-2.90-2.98-3.07-3.13-3.20-3.27-3.33-3.40-3.47-3.57-3.68-3.83-4.05-4.35-4.75-5.35-6.23-7.580.00}
	{-4.67-4.33-4.02-3.73-3.45-3.18-2.95-2.72-2.48-2.28-2.08-1.90-1.72-1.55-1.40-1.25-1.10-0.97-0.83-0.72-0.60-0.48-0.38-0.28-0.18-0.10-0.020.030.120.170.230.280.320.370.380.420.430.430.430.430.430.400.380.350.320.270.220.170.100.03-0.03-0.10-0.18-0.28-0.37-0.47-0.57-0.68-0.78-0.90-1.02-1.13-1.23-1.35-1.47-1.58-1.68-1.78-1.88-1.98-2.07-2.15-2.23-2.30-2.35-2.42-2.47-2.52-2.57-2.62-2.68-2.75-2.87-3.00-3.20-3.48-3.88-4.45-5.32-6.630.00}
	{-4.35-4.03-3.73-3.45-3.18-2.93-2.68-2.47-2.25-2.05-1.87-1.68-1.50-1.35-1.18-1.03-0.90-0.77-0.63-0.52-0.40-0.30-0.18-0.080.000.070.150.230.300.370.420.480.520.570.600.620.650.650.670.670.670.650.630.600.570.530.500.4