You can use a virtualcoordinatesystem and keep your program distanced from the hardware, or you can use the device coordinate system and snuggle right up to the hardware.
你可以用虚坐标系统并且保持你的程序与硬件的距离，或者你可以用设备坐标系统而完全依赖于硬件。
2
To address the holes problem in wireless sensor networks, a novel geographic routing algorithm, named Double Greedy algorithm (DGA), was proposed based on virtualcoordinatesystem.