Based on the principles of landscape ecology, supported by 3s technology, the landscape pattern of land utilization in Qichun County is quantitatively analyzed in this paper.

依据景观生态学原理，采用3s技术，对蕲春县土地利用景观格局进行定量的分析研究。

youdao

Based on interferometry measurement theory of satellite carrier phase, the technology of land vehicle heading determination through Beidou Bi-Satellite System was studied.

基于卫星载波相位干涉测量原理，研究了利用北斗双星系统确定车辆航向的相关技术。

youdao

Based on GIS technology, agricultural land gradation was studied applying factor method and modifying method in the centre of Leshan City, Sichuan Province.

以GIS为平台，采用修正法和因素法相结合，对乐山市中区农用地定级进行了研究。

youdao

Mr.Obama says the change in policy was also prompted by advances in technology, including improvements in land and sea-based interceptors and the sensors that support them.

VOA: standard.2009.09.17

Gogo's more than 150 land based cellular towers have already been modified for the new technology.

ENGADGET: Gogo launches next-gen in-flight internet, with better speeds and more capacity

The report also lauds the land-based eLoran radio navigation system as a very worthy back-up technology.

BBC: UK 'over-reliant' on GPS signals, engineers warn