全文获取类型
收费全文 | 153篇 |
免费 | 12篇 |
国内免费 | 25篇 |
专业分类
测绘学 | 56篇 |
大气科学 | 50篇 |
地球物理 | 20篇 |
地质学 | 7篇 |
海洋学 | 23篇 |
天文学 | 3篇 |
综合类 | 8篇 |
自然地理 | 23篇 |
出版年
2022年 | 1篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 2篇 |
2015年 | 3篇 |
2014年 | 5篇 |
2013年 | 19篇 |
2012年 | 7篇 |
2011年 | 4篇 |
2010年 | 2篇 |
2009年 | 9篇 |
2008年 | 13篇 |
2007年 | 15篇 |
2006年 | 12篇 |
2005年 | 9篇 |
2004年 | 14篇 |
2003年 | 10篇 |
2002年 | 7篇 |
2001年 | 14篇 |
2000年 | 8篇 |
1999年 | 5篇 |
1998年 | 9篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
排序方式: 共有190条查询结果,搜索用时 31 毫秒
91.
利用数字化的NOAA AVHRR数据进行小比例尺、准同步宏观制图是一种低成本和快速的制图方法。笔者应用本文方法制作了第一幅小比例尺的、完整的中国假彩色卫星影象地图。它包含了全部的南中国海,这是使用其他的遥感数据(如陆地卫星或SPOT卫星)难以做到的。该图采用了热红外、近红外和可见光的红波段所构成的假彩色合成方案,提供了丰富的色彩和影象信息。本图制作时实施的数据处理内容包括:地图投影变换、影象反差增强和锐化、彩色平衡调整、去云处理和海陆分离处理、利用植被指数原理的影象时相修正和数字镶嵌操作等。根据影象地图的载负量和视觉效果,图上精心选取并设计了地理要素、地图符号和注记。该图是应用遥感新技术开发的地图新产品,被十七届国际摄影测量与遥感会议选为展示成果,并被该会评为获奖成果。 相似文献
92.
西北干旱区及高原上卫星遥感非均匀地表区域能量通量研究 总被引:3,自引:1,他引:3
介绍了目前利用Landsat TM和NOAA/AVHRR遥感资料进行非均匀地表区域地表能量通量和蒸发(蒸散)量研究的进展和存在的难点问题,并提出了解决问题的可能途径。 相似文献
93.
Sabine Thiemann Helmut Schiller 《International Journal of Applied Earth Observation and Geoinformation》2003,4(4):339-349
The spatial and temporal variability of the bulk temperature gives important insights into biological and hydrodynamic processes. However, standard algorithms for satellite data only provide information of the surface temperature. The comparison of current and new split-window coefficients applied on NOAA-14/AVHRR brightness temperatures of Lake Constance showed that a regional adaption was most promising. To derive the bulk temperature information, a priori progression from a weather station was included into the AVHRR analysis. Among the weather is data, the mean temperature of the three preceding days and the day of the year were the most relevant additional information. By a multiple regression approach the bulk temperature in the upper 4 m of Lake Constance could be determined with an accuracy of ±1.20 °C. The training of a neural network improved the determination of the bulk temperature to ±1.04 °C.An extended field campaign demonstrated that the algorithm is also applicable to other sensors with the same spectral band settings (in this case NOAA-16/AVHRR) with an acceptable error and that it is equally accurate over the entire lake. 相似文献
94.
95.
96.
All-weather Arctic cloud analyses primarily derived from a surface-based hemispheric all-sky imager are compared against ISCCP D-1 cloud amount, type, and phase during the sunlit polar season. Increasing surface temperatures and decreasing ice cover over the past decade have altered heat and moisture fluxes around the Arctic, providing conditions more conducive for cloud generation. Shipboard and ice camp measurements from field experiments conducted over an 8-year period show cloudy skies in 70–95% of the record. Most of these occurrences are stratiform or multi-level, multi-form cloud, increasing in amount with time through the season. Collocated ISCCP retrievals underestimate cloud amount at small solar zenith angles and overestimate at large angles, sometimes by as much as 50%. Satellite assessments of cloud form classify 95% of scenes as having multiple cloud types, the majority of which are mid-level ice cloud and low-level liquid cloud. Despite large discrepancies in diurnal cloud amount, regional averages of ISCCP pixel cloudiness over the length of the experiments agree within ±5% of surface observations. 相似文献
97.
根据理论和经验上已证明的地表温度与AVHRR窗区通道4、5的亮度温度存在线性或非线性关系, 通过对2818条全球晴空大气廓线做不同比辐射率地表的FY-1D窗区通道4、5辐射率的模拟计算, 推导出FY-1D极轨气象卫星的红外通道4、5亮温与地表温度的二次回归关系式。同时详细介绍了由这一回归关系式和FY-1D高分辨率图像传输 (HRPT) 遥测数据计算陆表温度的方法, 最后给出陆表温度计算结果的精度:用中国地面气象台站的0 cm地温观测数据与相同时刻的分辨率为0.01°×0.01°经纬度的卫星陆表温度相对比, 两者非常吻合, 绝大部分台站|ΔT|<3.0 K。 相似文献
98.
MODIS和AVHRR植被指数关系的研究 总被引:31,自引:1,他引:31
对同一区域不同时次的MODIS和AVHRR的归一化植被指数 (NDVI) ,从直方图和特征空间分布方面进行了分析比较。 相似文献
99.
中国农情遥感速报系统对每日的NOAA AVHRR进行定量处理,其中用CLAVR方法进行云标识。本文选择三景不同地区的NOAA AVHRR影像,分析评价CLAVR方法云标识的效果和各个步骤的标识能力,以及空间上的差异,并根据运行经验,对CLAVR方法的部分参数进行了调整,使其更加适应中国大陆的情况。总体上,CLAVR方法标识干净像元和云污染像元的准确性较高,而在标识混合像元时稍差。其中RGCT、RUT、TUT和C3AT的检出率占总检出率89.2%以上,并在不同的地区,不同步骤的贡献度不一致,也说明了云相变化随区域不同而变化。 相似文献
100.
A chain of three nested models, based on the MARS 3D code, is used to simulate the North-western Mediterranean Sea circulation
with a finest grid of 1.2 km resolution and 30 vertical sigma levels. This modelling system allows to resolve the coastal
dynamics taking into account the influence of the general basin circulation. The aim of this study is to assess the ability
of the nested MARS-3D models to reproduce most of the circulation features observed in the North-western Mediterranean Basin
and in the Gulf of Lions. Comparisons of modelled sea surface temperature and salinity with MEDAR/MEDATLAS climatology and
NOAA/AVHRR satellite measurements show that the model accurately reproduces the large and coastal scale variability. Over
the Northern Basin, the seasonal changes of the cyclonic gyre extension are correctly simulated, even though in summer, the
modelled temperature of the surface layer remains in basin-average 1°C cooler than the satellite measured temperature. As
soon as the stratification erodes, modelled and observed temperatures become closer. Over the Gulf of Lions, realistic coastal
responses are obtained under different wind conditions. Upwellings are correctly located and their intensity and spatial extension
were here improved by the use of Aladin wind fields (10 km spatial resolution) and the introduction of a drag coefficient
fitted according to the stability of the planetary boundary layer. The dispersion of fresh Rhone water discharge and the mesoscale
circulation simulated by MARS-3D also agree with satellite measurements. 相似文献