Next: 27.3 Program CODAQ_POLYGON Up: 27. Calculation of coda Previous: 27.1.4 General recommendations and Contents Index
Q =Q0*f**qalpha
is also calculated. If little data is available, Q0 can additionally be calculated for fixed qalpha given by the user. Results are also made for f=10 Hz, Q10, since this might show the differences between areas more clearly. The values in each bin is listed in an output file which can be displayed to get an approximate idea of the areal Q-distribution. In addition, a contoured map is made with EPIMAP of Q0 or Q10 and started from CODAQ_AREA. Optionally it can be deselected with parameter *Extrapolate', see below.
Input files: It is assumed that codaq.area and codaq1.out exist so these names are hardwired. Codaq1.out is used to get the frequencies available for the data set.
The interactive options are: Min no for grid average, min no of freq for Q0 calculation: Minimum number of values in a grid point for average to be calculated
Constant qalpha in Q=Q0*f**qalpha relation, 0 means do not use: Q0, can optional be calculated with a fixed qalpha. This can be useful when there is little data and it is expected that qalpha does not vary a lot over a region.
Print numbers of observations for each Q0: 1 else 0: When printing out the Q0, it is also possible to print out the total number of observations used for calculating Q0. This is all results for all frequencies.
Extrapolate q0 or q10 for plot, 0=no, 1=yes, -1= do no plot contours: When making the contours, it is possible to extrapolate the Q0 or Q10 values to bins with no data. This is done by averaging the values for the bins around. This process is done several times to fill the complete grid so in gridpoints more than 2 away from grids with data, all values will be constant.
Plot Q0 (0) or q10 (1): Plot Q0 or Q10
Latitude range and grid size: It can be a fraction of a degree but Q0 does not have resolutions better than one degree.
Longitude range and grid size: ——————————–
The interactive options can be stored in a file called codaq_area.inp. If the file is present, input will be read from that file and no questions asked. An example of the file is:
Minimum number for grid average 3 Minimum number of frequencies for Q0 calculation 4 Constant qalpha in Q=Q0*f**qalpha relation, 0 means do not use 0.0 Print numbers of observations for each Q0 (1), else 0 0 Extrapolate q0 or q10 for plot, 0=not, 1=yes 1 Plot Q0 (0) or q10 (1) 0 Latitude range and delta 34 44 1 Longitude range and delta -12,-2 1
The comments between the lines with numbers are just for information but there must be a line. This example file is also in DAT.
Example run with input from parameter file so no questions:
C:\>codaq\_area Frequencies 1.00 2.00 4.00 8.00 16.00 Min no for grid average, min no of freq for Q0 calculation 3 4 Constant in Q-relation, print number of observations 0.00000000 0 Extrapolate, plot Q0 0 0 Lat range and delta 34.0000000 44.0000000 1.00000000 Lon range and delta -14.0000000 -2.00000000 1.00000000 Number of q-data in input file 4581 Number of q-data inside grid 4581 Range of Q values to plot 58.4 310.7 Writing codaq\_area\_epimap.inp .... .... epimap output .... File with area grid: codaq\_area.out File with grid points: codaq\_grid.out File with epimap commands: codaq\_area\_epimap.inp
Example of the areal output file coda_area.out showing the lat-lon bins, note the midpoint of the bin is used:
freq= 1.00000000
-13.5 -12.5 -11.5 -10.5 -9.5 -8.5 -7.5 -6.5 -5.5 -4.5 -3.5 -2.5
43.5 0 0 0 0 0 0 0 0 0 0 0 0
42.5 0 0 0 0 0 0 0 0 0 0 0 0
41.5 0 0 0 0 0 0 0 0 0 0 0 0
40.5 0 0 0 0 0 0 0 0 0 0 0 0
39.5 0 0 0 0 81 93 0 0 0 0 0 0
38.5 0 0 0 0 136 114 0 0 196 0 0 0
37.5 0 0 0 0 0 0 0 0 0 88 94 0
36.5 0 0 97 0 0 141 0 83 124 0 103 0
35.5 0 0 0 134 0 0 0 0 107 0 0 0
34.5 0 0 0 0 0 0 0 0 89 0 0 0
freq= 2.00000000
-13.5 -12.5 -11.5 -10.5 -9.5 -8.5 -7.5 -6.5 -5.5 -4.5 -3.5 -2.5
43.5 0 0 0 0 0 0 256 0 0 0 0 0
42.5 0 0 0 0 323 0 0 227 0 0 0 0
41.5 0 0 0 0 0 394 150 0 0 0 0 0
40.5 0 0 0 0 0 112 0 0 0 0 0 0
39.5 0 0 0 0 221 227 0 0 0 0 0 0
38.5 0 0 0 0 256 338 303 0 0 0 0 0
37.5 0 0 0 0 0 245 273 0 0 126 125 0
36.5 0 219 141 0 0 156 0 133 155 0 135 0
35.5 0 0 0 155 0 0 0 0 155 0 0 0
34.5 0 0 0 0 0 0 0 0 128 0 0 0
freq= 4.00000000
-13.5 -12.5 -11.5 -10.5 -9.5 -8.5 -7.5 -6.5 -5.5 -4.5 -3.5 -2.5
43.5 0 0 0 0 0 0 487 0 0 0 0 0
42.5 0 0 0 0 619 0 0 411 0 0 0 0
41.5 0 0 0 0 0 640 485 565 0 0 0 0
40.5 0 0 0 0 0 502 546 0 0 0 0 0
39.5 0 0 0 0 556 531 0 0 0 0 0 0
38.5 0 0 0 0 503 560 540 0 0 623 0 0
37.5 0 0 0 0 319 500 505 0 265 235 207 0
36.5 0 287 210 384 280 303 287 196 211 0 204 0
35.5 0 0 0 273 0 0 207 0 233 0 0 0
34.5 0 0 0 0 0 0 0 0 209 0 0 0
freq= 8.00000000
-13.5 -12.5 -11.5 -10.5 -9.5 -8.5 -7.5 -6.5 -5.5 -4.5 -3.5 -2.5
43.5 0 0 0 0 0 790 803 0 0 0 0 0
42.5 0 0 0 0 921 1121 0 712 0 0 0 0
41.5 0 0 0 0 0 859 896 808 0 0 0 0
40.5 0 0 0 0 0 732 797 0 0 0 0 0
39.5 0 0 0 0 948 880 667 0 0 0 808 0
38.5 0 0 0 0 884 897 836 0 1002 1028 0 0
37.5 0 0 0 0 622 812 899 970 774 463 379 0
36.5 0 486 386 604 569 607 577 0 0 0 358 0
35.5 0 0 0 492 0 0 0 0 754 0 0 0
34.5 0 0 0 0 0 0 0 0 518 0 0 0
freq= 16.0000000
-13.5 -12.5 -11.5 -10.5 -9.5 -8.5 -7.5 -6.5 -5.5 -4.5 -3.5 -2.5
43.5 0 0 0 0 0 1238 1306 1342 0 0 0 0
42.5 0 0 0 0 1362 1574 0 1216 0 0 0 0
41.5 0 0 0 0 0 0 1499 1302 0 0 0 0
40.5 0 0 0 0 0 0 1451 0 0 0 0 0
39.5 0 0 0 0 1558 1376 0 0 0 0 0 0
38.5 0 0 0 0 1534 1375 1295 1442 0 1537 0 0
37.5 0 0 0 0 1413 1306 1366 1418 0 970 805 0
36.5 0 0 0 0 1007 1427 0 0 0 0 0 0
35.5 0 0 0 1188 0 0 0 0 0 0 0 0
34.5 0 0 0 0 0 0 0 0 989 0 0 0
Q0
-13.5 -12.5 -11.5 -10.5 -9.5 -8.5 -7.5 -6.5 -5.5 -4.5 -3.5 -2.5
43.5 0 0 0 0 0 0 160 0 0 0 0 0
42.5 0 0 0 0 226 0 0 133 0 0 0 0
41.5 0 0 0 0 0 256 129 0 0 0 0 0
40.5 0 0 0 0 0 58 0 0 0 0 0 0
39.5 0 0 0 0 103 126 0 0 0 0 0 0
38.5 0 0 0 0 142 162 193 0 196 266 0 0
37.5 0 0 0 0 69 169 166 310 0 85 77 0
36.5 0 114 83 0 0 87 0 0 0 0 83 0
35.5 0 0 0 118 0 0 0 0 93 0 0 0
34.5 0 0 0 0 0 0 0 0 72 0 0 0
Q10
-13.5 -12.5 -11.5 -10.5 -9.5 -8.5 -7.5 -6.5 -5.5 -4.5 -3.5 -2.5
43.5 0 0 0 0 0 0 923 0 0 0 0 0
42.5 0 0 0 0 1032 0 0 841 0 0 0 0
41.5 0 0 0 0 0 1115 1005 0 0 0 0 0
40.5 0 0 0 0 0 1468 0 0 0 0 0 0
39.5 0 0 0 0 1061 965 0 0 0 0 0 0
38.5 0 0 0 0 1035 1034 962 0 1193 1150 0 0
37.5 0 0 0 0 848 933 1006 1096 0 522 457 0
36.5 0 559 440 0 0 857 0 0 0 0 417 0
35.5 0 0 0 747 0 0 0 0 561 0 0 0
34.5 0 0 0 0 0 0 0 0 590 0 0 0
Qalpha
-13.5 -12.5 -11.5 -10.5 -9.5 -8.5 -7.5 -6.5 -5.5 -4.5 -3.5 -2.5
43.5 0.00 0.00 0.00 0.00 0.00 0.00 0.76 0.00 0.00 0.00 0.00 0.00
42.5 0.00 0.00 0.00 0.00 0.66 0.00 0.00 0.80 0.00 0.00 0.00 0.00
41.5 0.00 0.00 0.00 0.00 0.00 0.64 0.89 0.00 0.00 0.00 0.00 0.00
40.5 0.00 0.00 0.00 0.00 0.00 1.40 0.00 0.00 0.00 0.00 0.00 0.00
39.5 0.00 0.00 0.00 0.00 1.01 0.88 0.00 0.00 0.00 0.00 0.00 0.00
38.5 0.00 0.00 0.00 0.00 0.86 0.80 0.70 0.00 0.78 0.64 0.00 0.00
37.5 0.00 0.00 0.00 0.00 1.08 0.74 0.78 0.55 0.00 0.79 0.77 0.00
36.5 0.00 0.69 0.72 0.00 0.00 0.99 0.00 0.00 0.00 0.00 0.70 0.00
35.5 0.00 0.00 0.00 0.80 0.00 0.00 0.00 0.00 0.78 0.00 0.00 0.00
34.5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.91 0.00 0.00 0.00
Output file codaq_grid.out contains details of the averages in each bin see part of file below:
freq= 1.00000000
34.500 -13.500 0.0 0.0 0
34.500 -12.500 0.0 0.0 0
34.500 -11.500 0.0 0.0 0
34.500 -10.500 0.0 0.0 0
34.500 -9.500 0.0 0.0 0
34.500 -8.500 0.0 0.0 0
34.500 -7.500 0.0 0.0 0
34.500 -6.500 0.0 0.0 2
34.500 -5.500 89.5 21.1 81
34.500 -4.500 0.0 0.0 0
34.500 -3.500 0.0 0.0 0
34.500 -2.500 0.0 0.0 0
35.500 -13.500 0.0 0.0 0
35.500 -12.500 0.0 0.0 0
35.500 -11.500 0.0 0.0 0
35.500 -10.500 134.9 13.7 3
35.500 -9.500 0.0 0.0 0
35.500 -8.500 0.0 0.0 0
35.500 -7.500 0.0 0.0 0
35.500 -6.500 0.0 0.0 0
35.500 -5.500 107.8 15.8 4
35.500 -4.500 0.0 0.0 0
35.500 -3.500 0.0 0.0 0
35.500 -2.500 0.0 0.0 0
36.500 -13.500 0.0 0.0 0
36.500 -12.500 0.0 0.0 1
36.500 -11.500 97.4 49.9 5
36.500 -10.500 0.0 0.0 0
36.500 -9.500 0.0 0.0 0
....
41.500 -2.500 0.0 0.0 0
42.500 -13.500 0.0 0.0 0
42.500 -12.500 0.0 0.0 0
42.500 -11.500 0.0 0.0 0
42.500 -10.500 0.0 0.0 0
42.500 -9.500 0.0 0.0 0
42.500 -8.500 0.0 0.0 0
42.500 -7.500 0.0 0.0 0
42.500 -6.500 0.0 0.0 0
42.500 -5.500 0.0 0.0 0
42.500 -4.500 0.0 0.0 0
42.500 -3.500 0.0 0.0 0
42.500 -2.500 0.0 0.0 0
43.500 -13.500 0.0 0.0 0
43.500 -12.500 0.0 0.0 0
43.500 -11.500 0.0 0.0 0
43.500 -10.500 0.0 0.0 0
43.500 -9.500 0.0 0.0 0
43.500 -8.500 0.0 0.0 0
43.500 -7.500 0.0 0.0 0
43.500 -6.500 0.0 0.0 0
43.500 -5.500 0.0 0.0 0
43.500 -4.500 0.0 0.0 0
43.500 -3.500 0.0 0.0 0
43.500 -2.500 0.0 0.0 0
freq= 2.00000000
34.500 -13.500 0.0 0.0 0
34.500 -12.500 0.0 0.0 0
34.500 -11.500 0.0 0.0 0
34.500 -10.500 0.0 0.0 0
34.500 -9.500 0.0 0.0 0
34.500 -8.500 0.0 0.0 0
34.500 -7.500 0.0 0.0 0
34.500 -6.500 0.0 0.0 2
34.500 -5.500 129.0 23.5 114
34.500 -4.500 0.0 0.0 0
34.500 -3.500 0.0 0.0 0
34.500 -2.500 0.0 0.0 0
35.500 -13.500 0.0 0.0 0
35.500 -12.500 0.0 0.0 0
35.500 -11.500 0.0 0.0 1
35.500 -10.500 155.4 26.0 23
35.500 -9.500 0.0 0.0 1
35.500 -8.500 0.0 0.0 0
35.500 -7.500 0.0 0.0 0
35.500 -6.500 0.0 0.0 0
35.500 -5.500 155.6 13.4 11
35.500 -4.500 0.0 0.0 0
35.500 -3.500 0.0 0.0 0
35.500 -2.500 0.0 0.0 0
36.500 -13.500 0.0 0.0 0
36.500 -12.500 219.2 106.5 5
36.500 -11.500 141.4 30.3 7
36.500 -10.500 0.0 0.0 0
The output is: Bin midpoint, average Q, standard deviation in average and number of points in bin.
Finally a plot is made with contours of Q, see Figure 27.2.
![\begin{figure}
\centerline{\includegraphics[width=0.9\linewidth]{fig/codaq-area}}
\end{figure}](img164.png) |
The map with the contours is produced automatically from the input. The projection is Mercator and the land contour is WORLD.MAP in DAT. Another map file can be used by setting parameter EPIMAP_MAP_FILE in SEISAN.DEF. The commands for running EPIMAP are in output file codaq_area_epimap.inp, so this file can also be modified to change map projection etc (see EPIMAP) and the plot regenerated by giving command
epimap codaq_area_epimap.inp