手持GPS在1：5万水系沉积物测量中的应用

青海省有色地勘局地质矿产勘查院从2002年至今，在1：5万水系沉积物测量工作中，将手持GPS的单点绝对定位及航迹运用到野外质量监控，可以较好地解决直接用地形图定点而造成跑错沟，以及由于人为因素导致点位失真、采样随机性大的问题。不仅提高了野外定点精度，而且通过Arcview GIS软件，使管理人员及时了解野外生产进展及采样点的到位情况。定位时必须做到：合理选取校正的控制点；正确校正参数；手持GPS必须一致；航迹必须打开。

The Application of Hand-GPS in 1:50000 Stream Sediment Survey

Since 2002, the single point absolute positioning and track hand GPS have been used in field quality control by QIGMR during the 1 ： 50000 stream sediment survey. The channels pointing mistakes caused by using topographic map and other problems such as pointing distortion and sampling random caused by human factors can be avoided. It not only raises the accuracy of field pointing, but also enables the managers to know progress in the field and accuracy of sampling through Arcview GIS software. The things must be done during positioning as follows： choose proper correction control points; correct the parameters rightly; conformable hand GPS;turn track on.