POS文件格式
POS文件每行按顺序依次为GPS时间、经度、纬度、高度、翻滚角（Roll）、俯仰角（Pitch）、偏航角（Heading）、GridX，GridY。其中GPS时间、高度、翻滚角（Roll）、俯仰角（Pitch）、偏航角（Heading）为必须包含项，（经度、纬度）或（GridX、GridY）至少包含一项，若POS文件中不包含GridX和GridY信息，则在导入航迹线文件时，需设置投影坐标系，航带拼接模块会根据投影坐标系和经纬度自动计算出GridX，GridY信息。
其文件存储的航迹信息结构如下：
| Data | Units | Type |
|---|---|---|
| GPS time | seconds | double |
| longitude | degree | double |
| latitude | degree | double |
| height | meters | double |
| roll | degree | double |
| pitch | degree | double |
| heading | degree | double |
| GridX(Optional) | meters | double |
| GridY(Optional) | meters | double |
以下为POS文件部分信息
示例1（不包含GridX，GridY）：
380954.000,112.5311950876, 26.8969520123,378.543, 7.1701230000, 3.0890110000,-39.4065340000
380954.008,112.5311938923, 26.8969533249,378.537, 7.2001860000, 3.0914780000,-39.4034150000
380954.016,112.5311926975, 26.8969546376,378.531, 7.2368710000, 3.0936380000,-39.4011190000
380954.024,112.5311915034, 26.8969559507,378.525, 7.2683090000, 3.1015050000,-39.3975470000
380954.032,112.5311903098, 26.8969572641,378.518, 7.3007560000, 3.1115160000,-39.3929590000
380954.040,112.5311891169, 26.8969585779,378.512, 7.3269790000, 3.1179720000,-39.3878260000
380954.048,112.5311879247, 26.8969598920,378.506, 7.3525870000, 3.1180460000,-39.3804020000
380954.056,112.5311867331, 26.8969612065,378.500, 7.3745730000, 3.1151630000,-39.3713830000
示例2（包含GridX,GridY）：
383207.336,112.5421590662,26.9034172036,313.865,3.538615,2.660518,-67.848653,653147.099716932,2976670.62354689
383207.344,112.5421572108,26.9034177865,313.861,3.533299,2.659177,-67.840828,653146.914649722,2976670.68587654
383207.352,112.5421553554,26.9034183697,313.857,3.522385,2.658042,-67.828619,653146.729582108,2976670.74823943
383207.36,112.5421535001,26.9034189529,313.854,3.512757,2.659231,-67.816251,653146.544524429,2976670.81060244
383207.368,112.5421516447,26.9034195363,313.85,3.502656,2.662677,-67.807435,653146.35945655,2976670.87298749
383207.376,112.5421497892,26.9034201198,313.846,3.502243,2.664987,-67.803265,653146.174378605,2976670.9353835
383207.384,112.5421479336,26.9034207035,313.843,3.500293,2.668456,-67.80232,653145.989290462,2976670.99780155
383207.392,112.5421460783,26.9034212874,313.839,3.501546,2.671267,-67.797563,653145.804231844,2976671.06024212
383207.4,112.5421442231,26.9034218713,313.835,3.496569,2.674773,-67.789195,653145.619183163,2976671.12268281
383207.408,112.542142368,26.9034224554,313.832,3.483849,2.676885,-67.774991,653145.434144147,2976671.18514579
383207.416,112.5421405129,26.9034230395,313.828,3.471533,2.676137,-67.765536,653145.24910513,2976671.24760876
383207.424,112.5421386577,26.9034236237,313.824,3.47028,2.675779,-67.760612,653145.064056049,2976671.3100827
383207.432,112.5421368024,26.9034242079,313.82,3.475101,2.677064,-67.761833,653144.878997039,2976671.37255652
383207.44,112.5421349471,26.9034247923,313.817,3.476053,2.681571,-67.761664,653144.69393776,2976671.43505249