在该地区有效地运用遥感技术来辅助野外实地调查十分必要。
It is necessary to survey in field assisted by remote sensing technology in that area.
通过野外实地调查和定位观测，系统研究了灌木林盖度对风沙土风蚀的影响。
Through field investigation and observation, the influences of shrub coverage on soil erosion by wind were systematically studied.
结合野外实地调查现状，以二级边界为基础，将污染区域划为土壤重金属污染预警区。
Combining with the current situation of the field investigation, and basing on the second grade border, we assign the polluted area to be the early warning district of soil heavy metal pollution.
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