全球 海图资源(无偏移 )
海图是地图的一种，即航海专用地图。海图是以表示海洋区域制图现象的一种地图。将地球表面的海洋及其连接的陆地，经过制图综合以符号、文字和颜色相配合，反映出各种自然现象和社会经济现象的地理分布与相互关系的科学作品。航海必需要有精确测绘海洋水域和沿岸地物的专门地图，所以海图是按一定的比例尺和投影方法绘制而成。
海道测量就是为保证航行安全为目的而对海洋水体和水下地形进行测量和调查的工作，是确保航行安全和海洋发展的基础性、前期性工作。它主要服务于航行安全，并为所有海洋活动，包括经济开发、安全和国防、科学研究以及环境保护提供支持。主要包括了控制测量、岸线地形测量、水深测量、扫海测量、海洋底质探测、海洋水文观测、助航标志的测定以及海区资料的调查等。
水深测量主要是利用声学原理进行深度的测定，其原理是：测深设备发射并接收声波，由声波发射和接收的时间差×声波在水中传输的速度÷2，得到测深仪的换能器到水底的距离，但声波的传输速度在不同的温度、盐度、和深度会有变化，因此，在测量时需要在测量区域进行声速测定。
持续进行水深测量和海岸地形测量，获取海底地貌、底质情况和航行障碍物等信息，为后续编绘航海图提供
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