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longest. The LoS from left bottom point to top right  point are defined as Line1 and Line2 respectively.
and the LoS from right bottom point to top left

Fig.4.Two terrain tiles are pieced together starting with N04E01 and setting two lines of sight.

    In experiments, the heights of viewpoints         1 and Table 2. The heights of occlusion points are
and targets are initialized to 500m, 1000m,           lower than which of viewpoints and targets
1500m, 2000m, 2500m and 3000m respectively,           because of the influence of the earth curvature.
and the computational results are shown in Table

Table 1. The computational results of Line1 for different heights of viewpoints and targets.

                   Line1                              Heights( m)
       from N04E01 to N05E03
                                    500     1000      1500    2000    2500                        3000
Occlusion point longitude( °)      1.20     1.47                        -                           -
Occlusion point latitude( °)       4.10     4.23       1.53    1.81     -                           -
Occlusion point altitude( m)       67.45   138.63      4.27    4.40     -                           -
Computational number of GCS tiles                     559.18  840.72    2                           2
Intervisible                         1        1                       Yes                         Yes
                                    No       No          1       1
                                                        No      No

Table 2. The computational results of Line2 for different heights of viewpoints and targets.

                   Line2                              Heights( m)
       from N04E03 to N05E01
                                    500     1000      1500    2000    2500                        3000
Occlusion point longitude( °)       3.00    2.91                        -                           -
Occlusion point latitude( °)        4.00    4.05       2.70    2.24     -                           -
Occlusion point altitude( m)       499.84  784.94      4.15    4.38     -                           -
Computational number of GCS tiles                     894.75  865.52    2                           2
Intervisible                          1       1                       Yes                         Yes
                                     No      No          1       1
                                                        No      No                                    21
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