水准面

A simple algorithm is derived from linear Molodensky series solution for cm-order precision of quasi-geoid.

推导出了适合厘米级似大地水准面精化的线性Molodensky解实用简便的算法公式。

High resolution digital topographic data is very essential for the scientific engineering tasks, e.

高分辨率的地形数据在基础地理信息系统、地球重力场建模和大地水准面求定等工程中至关重要。

It may vary above and below the geometrical ellipsoid of revolution by as much as 100 meters due to the uneven distribution of mass within the Earth.

如果在海洋中没有潮汐，海流和涡旋等运动，在大气中没有气压的变化，那么，大地水准面应和平均海表面一致。

So if we know the earth internal structures and its geodynamic processes, we can determine a unique geoid.

因此，如果知道了地球内部结构和动力学过程，我们可以唯一准确地确定大地水准面。

Geoid height above sea level is assumed to be zero, which is

大地水准面海拔高度为假定为零，这是

Therefore geoid refining is one of important missions for the establishment of the height datum in a country or a region.

因此，精化大地水准面是一个国家或地区建立现代高程基准的主要任务之一。

The main purpose of physical geodesy is to ascertain the outer Earth gravity field and geoid.

物理大地测量的主要目标是确定地球外部重力场和大地水准面。

Both the direct and indirect terrain effects need to be taken in the precise geoid determination of the Western China area.

在确定中国西部精确的重力大地水准面时，直接和间接的地形影响都应该被顾及。

Recommendations were also given to extend the present study to further improve the geoid determination.

文中对如何扩展当前的研究，更有效地确定大地水准面也提供了建议。

The reference height we have chosen is the one closest to the average height of the worlds oceans. This is called the Geoid.

我们一般选择的参考高度是最接近全球平均海平面的那个层，也就是所谓的大地水准面。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。