基于ArcEngine的帽儿山林场GIS开发系统   总被引：1，自引：0，他引：1  

蒋汪洋  罗传文  孙海洪  彭勃 《东北林业大学学报》2010,38(10)

为了满足当前基层林场生产任务和业务管理的实际需求,提出以组件式GIS为基础,建立林场地理信息系统平台的构想,以实现森林资源的信息化管理帽儿山林场地理信息系统平台。将ArcGIS技术、ArcGISEn-gine技术、计算机技术及可视化技术融合在一起,以帽儿山林场森林资源调查数据和各种图面资料(林相图、地形图、各专题图)作为信息源,以面向对象可视化的编程语言Visual C++6.0为开发平台,采用GIS组件式ArcGIS Engine开发方法建立了森林资源地理信息系统,实现了森林资源的可视化管理。  相似文献   

Google Earth和GPS在林业调查中的应用   总被引：4，自引：0，他引：4  

郭仲朴  王金枝  韩丽丽 《天津农林科技》2010,(2):34-35

文章概述了利用Google Earth真实二维影像资料及GPS定位航点、移动轨迹、导航等相关功能,将GPS户外作业采集的航点、移动轨迹显示、锚定在GE影像图相对位置,并直接测出其采集到的点、线、面域等相关数据及工作图形一并完成的基本方法.为日后农林业户外勘测调查工作提供更直观、更科学、更简捷的途径.  相似文献   

比较PubMed，Scopus，Web of Science和Google Scholar的优点和缺点     

王丹 《农业图书情报学刊》2010,22(2):109-112

PubMed,Scopus,web of Science和Google Scholar是当代生物医学科学信息最流行的资源工具。本文旨在比较这四种数据库在特定生物医学主题中检索信息、更新引文分析的区别。用数据库的官方网页在期刊涵盖的范围、用于搜索的实用程序及其限制、更新频率、引文特征等进行比较。用实例对关键词搜索来评估这些数据库检索结果的特点,并检索特定的一篇文章查看其引文特征。  相似文献   

稀土不同施用量对烤烟生产的影响     

张柏顺  王俊辉  雷建军  李忠强 《内蒙古农业科技》2013,(6):72-74

为稀土在内蒙古烤烟种植方面的应用提供推广依据,以烤烟品种龙江911为试材,研究了稀土用量对烟苗生育期、植物学性状、大田农艺性状和经济性状等方面的影响。结果表明：喷施稀土元素可以改善烤烟的品质,其中,以稀释900倍的稀土对烟株的综合素质、农艺性状和经济性状表现最好。  相似文献   

基于GIS的澧南垸分洪洪水三维可视化淹没模拟     

冯畅  毛德华  李志龙  胡光伟 《中国农村水利水电》2013,(6)

研究适用于中小型蓄洪垸分洪洪水淹没模拟的可视化技术.利用Arcgis Engine 9.3在Visual Studi0 2008平台下,运用C#语言来建立澧南垸分洪洪水淹没程序.考虑到蓄洪垸分洪洪水的特殊性,选用给定水位的编程思路,近似地模拟了分洪洪水的蓄洪过程,并与相关成果的数值计算结果做比较.结果表明,该程序能较好地反映澧南垸分洪洪水的淹没过程,可以动态演示澧南垸分洪洪水的蓄洪过程,自定义查询淹没时的水位、范围和容积等洪水要素特征.该编程思路在类似于澧南垸的中小型蓄洪垸有更好的适应性,可以为澧南垸的防洪调度及防洪规划提供参考和依据.  相似文献   

发动机凸轮轴磨削变形补偿技术研究     

刘勇军  范晋伟  李云 《农业机械学报》2013,44(6):274-279

针对发动机凸轮轴数控磨削时产生连续变化的弹性变形问题,分析了凸轮轴受到磨削力变形对凸轮轮廓精度的影响,对轴向和径向变形进行了解耦,推导了不同位置、不同相位下凸轮受力变形量求解方程.分析了数控凸轮轴磨床的插补原理,建立了含有变形量误差的、工件旋转轴和砂轮进给轴联动的磨削运动学方程,提出了X轴变形量与理论插补值进行几何叠加的指令修正误差补偿方法.对某发动机进排气凸轮轴磨削变形进行了建模与仿真,对数控凸轮轴磨床进行了补偿与加工试验,仿真与加工试验结果均表明磨削变形补偿可以将凸轮轴的轮廓精度提高5 μm.  相似文献   

The role of green space in Chicago’s gentrification     

《Urban Forestry & Urban Greening》2022

Investment in park green space can improve the quality of life for urban residents but has also been linked to green gentrification. Investments in informal green space have been proposed as means for improving green access while minimizing the risk of displacement. Very little empirical research, however, has examined the differential impacts of park and non-park green space investments in the broader context of neighborhood greening. To further this understanding, we examine the association between park and non-park green space increases and the likelihood of gentrification in Chicago using satellite imagery, land use, and census data during two periods—1990–2000 and 2000–2010. We found that green space of any type did not have a statistically significant role in increasing the odds of gentrification, but the importance of green space variables in predicting gentrification increased with time. Neighborhood characteristics like the distance to downtown or the presence of gentrifying neighbors were most predictive, suggesting that green investment efforts should consider the pre-existing risk factors for gentrification. Our results do not dispute that green space has the potential to play a role in gentrification, simply that green gentrification may be strongly contingent upon timing and neighborhood characteristics.  相似文献   

Monthly composites from Sentinel-1 and Sentinel-2 images for regional major crop mapping with Google Earth Engine          下载免费PDF全文

Chong LUO  Huan-jun LIU  Lü-ping LU  Zheng-rong LIU  Fan-chang KONG  Xin-le ZHANG 《农业科学学报》2021,20(7):1944-1957

Rapid and accurate access to large-scale, high-resolution crop-type distribution maps is important for agricultural management and sustainable agricultural development. Due to the limitations of remote sensing image quality and data processing capabilities, large-scale crop classification is still challenging. This study aimed to map the distribution of crops in Heilongjiang Province using Google Earth Engine(GEE) and Sentinel-1 and Sentinel-2 images. We obtained Sentinel-1 and Sentinel-2 images from all the covered study areas in the critical period for crop growth in 2018(May to September), combined monthly composite images of reflectance bands, vegetation indices and polarization bands as input features, and then performed crop classification using a Random Forest(RF) classifier. The results show that the Sentinel-1 and Sentinel-2 monthly composite images combined with the RF classifier can accurately generate the crop distribution map of the study area, and the overall accuracy(OA) reached 89.75%. Through experiments, we also found that the classification performance using time-series images is significantly better than that using single-period images. Compared with the use of traditional bands only(i.e., the visible and near-infrared bands), the addition of shortwave infrared bands can improve the accuracy of crop classification most significantly, followed by the addition of red-edge bands. Adding common vegetation indices and Sentinel-1 data to the crop classification improved the overall classification accuracy and the OA by 0.2 and 0.6%, respectively, compared to using only the Sentinel-2 reflectance bands. The analysis of timeliness revealed that when the July image is available, the increase in the accuracy of crop classification is the highest. When the Sentinel-1 and Sentinel-2 images for May, June, and July are available, an OA greater than 80% can be achieved. The results of this study are applicable to large-scale, high-resolution crop classification and provide key technologies for remote sensing-based crop classification in small-scale agricultural areas.  相似文献   

寒地水稻苗床增温技术研究   总被引：4，自引：0，他引：4  

苗得雨  张益光 《北方水稻》2008,38(4)

为预防水稻苗期低温冷害,将保温材料隔离层增温技术与三模覆盖技术进行结合,经2006年和2007年两年试验结果表明:利用不同保温材料在苗床30 cm下做隔离层进行水稻育秧,可以显著提高苗床地温,平均比常规高4.19℃,并且为秧苗生长创造了有利生长环境,提高了秧苗素质,水稻生育期提早2 d左右,平均增产3.2%。保温材料隔离层增温技术与三膜覆盖技术相结合可以大幅度提高苗床地温,平均比常规高6.7℃。三个保温材料处理间,稻壳隔离层两处理增温效果要好于发泡塑料隔离层。  相似文献   

一种提高土地利用/覆被变化遥感监测补判效率新方法   总被引：1，自引：1，他引：0  

郑泽忠  范东明  李玉霞  曹云刚 《安徽农业科学》2008,36(27)

目前对土地利用/覆被变化遥感监测解译中不确定地物的补判通常利用GPS手持接收机在野外进行,这种方法常常耗财、耗时、耗力。提出利用Google Earth上部分地区具有的高分辨率影像,对土地利用/覆被变化遥感监测解译过程中部分不确定地物进行补判的新方法。结果表明,利用Google Earth在室内就可以对遥感监测解译过程中的部分不确定地物进行可靠补判,大大提高了土地利用/覆被变化遥感监测效率。  相似文献