全文获取类型
收费全文 | 204篇 |
免费 | 18篇 |
国内免费 | 74篇 |
专业分类
测绘学 | 47篇 |
大气科学 | 7篇 |
地球物理 | 9篇 |
地质学 | 9篇 |
海洋学 | 202篇 |
天文学 | 2篇 |
综合类 | 18篇 |
自然地理 | 2篇 |
出版年
2023年 | 1篇 |
2022年 | 5篇 |
2021年 | 10篇 |
2020年 | 9篇 |
2019年 | 16篇 |
2018年 | 2篇 |
2017年 | 8篇 |
2016年 | 11篇 |
2015年 | 24篇 |
2014年 | 13篇 |
2013年 | 28篇 |
2012年 | 12篇 |
2011年 | 14篇 |
2010年 | 4篇 |
2009年 | 10篇 |
2008年 | 4篇 |
2007年 | 12篇 |
2006年 | 14篇 |
2005年 | 8篇 |
2004年 | 16篇 |
2003年 | 22篇 |
2002年 | 9篇 |
2001年 | 9篇 |
2000年 | 4篇 |
1999年 | 14篇 |
1998年 | 5篇 |
1997年 | 5篇 |
1996年 | 1篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1991年 | 1篇 |
排序方式: 共有296条查询结果,搜索用时 31 毫秒
111.
海面粗糙度对于海洋工程和海洋军事都非常重要,但对海面粗糙度的现场观测资料非常少, 这大大制约了对海面粗糙度的认识。利用 TOPEX 高度计风速资料实现了对海面粗糙度的反演,并利用 1993 年和1998 年两年的资料对西北太平洋海域的海面粗糙度进行了研究。 相似文献
112.
113.
ICEsat-2/ATLAS是目前高程精度最高的星载激光数据,其数据覆盖全球,能够作为生产高精度全球地面参考高程的基础数据.基于ICESat-2/ATLAS全球激光数据产品ATL08,获取了全球ICESat-2陆地高程点,研究了基于参考高程数据和属性参数提取全球高程控制点的方法,并利用高精度参考高程数据验证了其精度.利... 相似文献
114.
115.
中国近岸海域高度计JASON-1测量数据的波形重构算法研究 总被引:3,自引:1,他引:2
卫星雷达高度计的测量数据目前已被广泛应用于各个领域,但高度计在近海的测量数据却一直不可用,一方面是因为高度计在近岸海域的回波波形测量受陆地回波的影响,另一方面是因为一些校正量对近海不准确,如大气湿对流层校正、海洋潮汐校正以及大气高频因数校正等。通过对高度计在近海测量的回波波形进行重构处理,可以缩短近海数据不可用的距离,提高数据的数量和质量。以我国海域及邻近海域(14°~45°N,105°~130°E)为研究区域,采用四种波形重构算法(海洋算法、重力中心偏离算法、冰层算法二和阈值算法)对JASON-1高度计1 a共31个周期的测量波形重新进行了计算,比较了轨道交叉点处升轨和降轨的海面高度异常值以及海面高度值与验潮站的实测水位,结果表明重力中心偏离法比其他三种算法更适合我国近海的测高波形重构:计算结果精度最高,有效数目最多。 相似文献
116.
利用1992年10月至2008年6月的卫星高度计融合资料对台湾岛周边海域(20°~28°N,117°~124°E)多年海平面变化进行分析.研究结果表明:(1)采用改进的月平均水位周期信号的谱分析方法计算多年来台湾岛周边海域海平面年均上升速率为0.34±0.02 cm/a,与该海域内的潮位站结果较为一致.(2)台湾岛周边海域海平面高度变化以1 a周期变化为主,其次为0.5 a、准2 a周期变化.(3)通过计算海平面异常的标准差得出多年来台湾海峡西南部海域海平面波动最为激烈.(4)分析了台湾岛周边海域海平面4个季节的变化情况,指出台湾岛周边海域海平面季节变化的主要驱动力是风场. 相似文献
117.
118.
TIDAL FEATURES IN THE CHINA SEAS AND THEIR ADJACENT SEA AREAS AS DERIVED FROM TOPEX/POSEIDON ALTIMETER DATA 总被引:2,自引:0,他引:2
Some important tidal features of 8 major tidal constituents (M2, S2, K1, O1, P1,Sa, N2 and K2 ) in the china Seas and their adjacent sea areas were obtained using six years‘ TOPEX/POSEIDON altimeter data. The results showed that the obtained co-tidal and co-range charts for these major tidal constituents agreed well with those of previous researches using observational data from coastal tidal gauge stations and numerical models. 相似文献
119.
Christopher Watson Neil White Richard Coleman John Church Peter Morgan Ramesh Govind 《Marine Geodesy》2004,27(1):107-131
Updated absolute calibration results from Bass Strait, Australia, are presented for the TOPEX/Poseidon (T/P) and Jason-1 altimeter missions. Data from an oceanographic mooring array and coastal tide gauge have been used in addition to the previously described episodic GPS buoy deployments. The results represent a significant improvement in absolute bias estimates for the Bass Strait site. The extended methodology has allowed comparison between the altimeter and in situ data on a cycle-by-cycle basis over the duration of the dedicated calibration phase (formation flight period) of the Jason-1 mission. In addition, it has allowed absolute bias results to be extended to include all cycles since the T/P launch, and all Jason-1 data up to cycle 60. Updated estimates and formal 1-sigma uncertainties of the absolute bias computed throughout the formation flight period are 0 ± 14 mm for T/P and +152 + 13 mm for Jason-1 (for the GDR POE orbits). When JPL GPS orbits are used for cycles 1 to 60, the Jason-1 bias estimate is 131 mm, virtually identical to the NASA estimate from the Harvest Platform off California calculated with the GPS orbits and not significantly different to the CNES estimate from Corsica. The inference of geographically correlated errors in the GDR POE orbits (estimated to be approximately 17 mm at Bass Strait) highlights the importance of maintaining globally distributed verification sites and makes it clear that further work is required to improve our understanding of the Jason-1 instrument and algorithm behavior. 相似文献
120.
Calibration/Validation of an Altimeter Wave Period Model and Application to TOPEX/Poseidon and Jason-1 Altimeters 总被引:1,自引:0,他引:1
The altimeter radar backscatter cross-section is known to be related to the ocean surface wave mean square slope statistics, linked to the mean surface acceleration variance according to the surface wave dispersion relationship. Since altimeter measurements also provide significant wave height estimates, the precedent reasoning was used to derive empirical altimeter wave period models by combining both significant wave height and radar backscatter cross-section measurements. This article follows such attempts to propose new algorithms to derive an altimeter mean wave period parameter using neural networks method. Two versions depending on the required inputs are presented. The first one makes use of Ku-band measurements only as done in previous studies, and the second one exploits the dual-frequency capability of modern altimeters to better account for local environmental conditions. Comparison with in situ measurements show high correlations which give confidence in the derived altimeter wave period parameter. It is further shown that improved mean wave characteristics can be obtained at global and local scales by using an objective interpolation scheme to handle relatively coarse altimeter sampling and that TOPEX/Poseidon and Jason-1 altimeters can be merged to provide altimeter mean wave period fields with a better resolution. Finally, altimeter mean wave period estimates are compared with the WaveWatch-III numerical wave model to illustrate their usefulness for wave models tuning and validation. 相似文献