1st open-source version

1. Add openMP to accelerate calcultion
2. reorganize the structure

README.md

@@ -0,0 +1,8 @@
+# lbl_gasabs
+author: Cheng Da ([email protected])
+
+A simplified line-by-line calculation for gas absorption using HITRAN database.
+
+1. Assume Lorentz line shapes
+2. Only consider CO2_626, H2O_161, O3_666
+3. Include examples for NOAA-18 HIRS channels.

SRF/rtcoef_noaa_18_hirs_srf_ch01.txt

@@ -0,0 +1,95 @@
+   1  ,noaa_18_hirs_01.flt
+Number of data points:
+91
+Wavenumber (cm-1)   Filter response
+      663.800000       0.000000
+      663.900000       0.000299
+      664.000000       0.000416
+      664.100000       0.002762
+      664.200000       0.005253
+      664.300000       0.008474
+      664.400000       0.013379
+      664.500000       0.019455
+      664.600000       0.027115
+      664.700000       0.037010
+      664.800000       0.048918
+      664.900000       0.063178
+      665.000000       0.080230
+      665.100000       0.099879
+      665.200000       0.122310
+      665.300000       0.147730
+      665.400000       0.175810
+      665.500000       0.206540
+      665.600000       0.239850
+      665.700000       0.275270
+      665.800000       0.312560
+      665.900000       0.351450
+      666.000000       0.391360
+      666.100000       0.432090
+      666.200000       0.473170
+      666.300000       0.514060
+      666.400000       0.554450
+      666.500000       0.594060
+      666.600000       0.632470
+      666.700000       0.669520
+      666.800000       0.705040
+      666.900000       0.738830
+      667.000000       0.770840
+      667.100000       0.801140
+      667.200000       0.829540
+      667.300000       0.856060
+      667.400000       0.880690
+      667.500000       0.903420
+      667.600000       0.924170
+      667.700000       0.942830
+      667.800000       0.959250
+      667.900000       0.973290
+      668.000000       0.984760
+      668.100000       0.992920
+      668.200000       0.998070
+      668.300000       1.000000
+      668.400000       0.998490
+      668.500000       0.993350
+      668.600000       0.984450
+      668.700000       0.971690
+      668.800000       0.955040
+      668.900000       0.934510
+      669.000000       0.910230
+      669.100000       0.882320
+      669.200000       0.851030
+      669.300000       0.816700
+      669.400000       0.779680
+      669.500000       0.740350
+      669.600000       0.699150
+      669.700000       0.656450
+      669.800000       0.612750
+      669.900000       0.568560
+      670.000000       0.524240
+      670.100000       0.480220
+      670.200000       0.437030
+      670.300000       0.394940
+      670.400000       0.354340
+      670.500000       0.315590
+      670.600000       0.278800
+      670.700000       0.244230
+      670.800000       0.212120
+      670.900000       0.182410
+      671.000000       0.155240
+      671.100000       0.130740
+      671.200000       0.108660
+      671.300000       0.089092
+      671.400000       0.072066
+      671.500000       0.057188
+      671.600000       0.044531
+      671.700000       0.034059
+      671.800000       0.025256
+      671.900000       0.018237
+      672.000000       0.012955
+      672.100000       0.008727
+      672.200000       0.005811
+      672.300000       0.004190
+      672.400000       0.002861
+      672.500000       0.002454
+      672.600000       0.003198
+      672.700000       0.002473
+      672.800000       0.000000