全文获取类型
收费全文 | 1193篇 |
免费 | 64篇 |
国内免费 | 33篇 |
专业分类
测绘学 | 891篇 |
大气科学 | 16篇 |
地球物理 | 73篇 |
地质学 | 104篇 |
海洋学 | 74篇 |
天文学 | 5篇 |
综合类 | 65篇 |
自然地理 | 62篇 |
出版年
2024年 | 3篇 |
2023年 | 6篇 |
2022年 | 39篇 |
2021年 | 49篇 |
2020年 | 56篇 |
2019年 | 64篇 |
2018年 | 33篇 |
2017年 | 97篇 |
2016年 | 62篇 |
2015年 | 58篇 |
2014年 | 55篇 |
2013年 | 85篇 |
2012年 | 96篇 |
2011年 | 75篇 |
2010年 | 59篇 |
2009年 | 42篇 |
2008年 | 61篇 |
2007年 | 68篇 |
2006年 | 56篇 |
2005年 | 36篇 |
2004年 | 31篇 |
2003年 | 28篇 |
2002年 | 32篇 |
2001年 | 12篇 |
2000年 | 11篇 |
1999年 | 13篇 |
1998年 | 8篇 |
1997年 | 4篇 |
1996年 | 8篇 |
1995年 | 8篇 |
1994年 | 7篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 6篇 |
1990年 | 7篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1986年 | 3篇 |
1984年 | 3篇 |
1982年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有1290条查询结果,搜索用时 46 毫秒
1.
AN ILLUSTRATIVE STUDY ON LOCAL LANDSCAPEAND ITS LONG-TERM CHANGES BASED ON IKONOS AND HISTORICAL AERIAL PHOTO 总被引:2,自引:0,他引:2
RUANRen-zong ErieCELLISt 《中国地理科学(英文版)》2004,14(2):162-169
Nowadays, the research works on landscape at fine scales using high-resolution images are uncommon.This research is based on the analysis of the combination of remote sensing data (1KONOS imagery acquired in 2002 and historical aerial photo taken in 1942). In the paper, the ecotopes in Qiujiadou and Xishao villages in Yixing City of Jiangsu Province in 1942 and 2002 were compared and landscape changes as well as the causes of the considerable changes were analyzed. It was found that the ecotope changes were at greater level in some aspects such as water surface and perennial vegetation coverage etc. This study at fine scale is globally significant for the rural areas, especially for the subsistence agricultural land, which occupies larger percentage in the earth. And it analyzes the structure of landscape based on a new landscape classification system--stratifications method. 相似文献
2.
3.
本文介绍了厦门岛市区机动车流遥感监测的实施目的和方法,通过航空影像有关题信息解译与实例、专题图件编制以及统计资料的对比分析,认为:目前厦门岛市区交通主要存在着机动车增长过速、道路狭窄和会计室场少且分布不合理等三个方面的问题,文中提出了相应的建议。体现了航空遥感对于中、大比例尺城市动态监测快速有效的特点。 相似文献
4.
Shinya Magome Tomohiro Yamashita Takeshi Kohama Atsushi Kaneda Yuichi Hayami Satoru Takahashi Hidetaka Takeoka 《Journal of Oceanography》2007,63(5):761-773
Jellyfish patch formation is investigated by conducting a drifter experiment combined with aerial photography of a sustained
patch of the moon jellyfish in Hokezu Bay, Japan. Jellyfish patches are aggregations of individuals that are caused by a combination
of swimming (active influence) and advection by currents (passive influence). The drifter experiment involved the injection
of 49 drifters around a distinct surface patch of jellyfish within an area of approximately 300 m × 300 m. The drifters’ motion,
caused only by the passive influence, was recorded in a series of 38 aerial photographs taken over approximately 1 h. The
ambient uniform current field larger than the patch scale was estimated from the movement of the centroid position of drifters,
while the distribution of horizontal divergence and relative vorticity around the patch was estimated from the time-derivative
in areas of triangles formed by the drifters. The centroid positions of both drifters and patches moved stably toward the
bay head at different speeds. The difference vector between the patch and drifter centroids was directed to the sun, and was
opposite to the ambient current. The distributions of vorticity and divergence around patches exhibited inhomogeneity within
the patch scale, and the drifters in this nonuniform current field aggregated near the convergence area within 1 h. The results
suggest that horizontal patch formation is predominantly influenced by passive factors at the surface of Hokezu Bay. Furthermore,
the upward swimming against downwelling may make sustained patch in surface layer. 相似文献
5.
6.
7.
8.
9.
中国煤炭地质总局航测遥感局作为我国煤炭航测技术的主要单位,承担着95%以上的煤炭矿区航测成图任务,并逐步发展成为我国集航空摄影、遥感地质、地图制印、地下管线探测、地理信息技术等全面发展的空间信息产业集团:伴随着计算机技术的发展,煤炭航测技术走过了从模拟测图到解析测图,最后发展到今天的全数字测图的历程。目前煤航已拥有和掌握了IMU/DGPS辅助航空摄影技术、SAR(合成孔径雷达)成图技术、LIDAR(机载激光扫描)技术等空间数据采集最新技术。 相似文献
10.
提出快速获得航空影像并及时制作DOM、DLG的一种手段.介绍遥控飞艇数字摄影系统的工作原理,探讨存在的问题. 相似文献