Spatial patterns of adolescent drug use     

《Applied geography (Sevenoaks, England)》2015

Adolescent drug use is individually and socially harmful in terms of disrupting adolescent development and social cohesion. Prior research has identified populations at risk and risk factors for adolescent drug use. This research sought to contextualize adolescent drug use by examining this behavior from a geographic perspective. The specific objectives were to identify patterns, local clusters and excess spatial risk for 5-digit zip codes within the 5-county Cincinnati, Ohio region. Adolescents (n = 57,241) were recruited within local schools by the Coalition for a Drug-free Greater Cincinnati. Results of this research show spatial clusters for perceived safety of marijuana; peer approval of alcohol, tobacco and marijuana; and age of onset for other drugs. The location and nature of these clusters are discussed and displayed in-text. Further, zip codes that were in excess risk compared to the 5-county region were identified. The utility of this research is two-fold: (1) It identifies the geographic variability in adolescent drug use and correlated factors of use, and (2) It provides a methodological framework for future research in spatial epidemiology of drug use.  相似文献   

北京地区土壤背景值图的编制   总被引：4，自引：0，他引：4  

李廷芳  刘宝元 《地理学报》1989,44(1):11-21

本文对北京地区土壤背景值匿的编制进行了全面、系统的总结。编制土壤背景值图的基础资料有302十样点的无素测定值和运用计算机制图和因素分析法揭露的元素区域分布规律。土壤背景值图是采用分级统计图的形式。其制图单元：山区以母岩，平原地区以成土母质类型和土壤质地作为划分依据；背景值的数量分级采用显著性检验分级法。  相似文献   

资源环境系列制图研究的现实基础与发展     

苏时雨  苏映平 《云南地理环境研究》1991,3(2):9-16

本文侧重于全国性资源环境及有关自然条件等专题制图工作的现实基础和成就,作简要总结和回顾。针对提高和重新认识制图效益和重点进行讨论,提出科学效益是基础,社会效益是目的,经济效益是根本,为资源环境的合理开发利用提供依据,并提出今后发展设想。  相似文献   

Mapping of groundwater quality in the Turonian aquifer of Oum Er-Rabia Basin, Morocco: a case study     

Said Ettazarini 《Environmental Geology》2006,50(6):919-929

This study takes the groundwater of the Moroccan limestone aquifer of Oum Er-Rabia as an example of statistical and cartographical approaches in water resources management. Statistical analyses based on frequency distribution and PCA methods revealed the homogeneity of waters with the existence of abnormal points and have helped to assess correlations between the studied variables. The mapping approach illustrated that waters are influenced by the lithology of the surrounding rocks and are of Ca–Mg–HCO₃, Ca–Mg–Cl–SO₄, and mixed types according to the Piper classification. The quality of water is of high to medium, north of the basin, but it is of medium to bad, NE and south, due to excessive contents of chloride, sulfate and nitrate. According to the US Salinity Laboratory classification, water used for irrigation in the eastern and the southern parts of the basin should take into consideration the drainage conditions, the nature of plants and the addition of gypsum doses.

Said EttazariniEmail: Phone: +212-66-407610

  相似文献   

2011-2012测绘学科发展研究综合报告(上)   总被引：2，自引：0，他引：2  

宁津生  王正涛 《测绘科学》2012,37(3):5-10

本报告简要回顾了我国当代测绘科学技术从数字化测绘向信息化测绘过渡,并与当今世界新出现的地理空间信息学相互融合和渗透形成测绘与地理空间信息学这一新兴学科的历程,结合测绘学科的几个分支学科阐述了2011年-2012年测绘与地理空间信息的空间基准、获取技术、处理方法、服务方式和应用领域等几方面的主要进展。  相似文献   

天绘一号卫星遥感影像的处理方法     

何忠焕  左志进  刘冬枝 《地理空间信息》2012,10(6):4-6,5

针对国家1∶50000数据库动态更新工程DOM制作需求,研究了天绘一号卫星影像数据处理方法,实现了卫星影像融合、区域网平差、DOM自动生产以及二次纠正。采用该方法进行生产,能够快速得到海量的满足精度要求的DOM数据,为后续的外业DLG调绘提供底图。  相似文献   

《测绘法》适应性浅析     

阮于洲 《测绘与空间地理信息》2012,(3):219-220

分析了新时期测绘发展面临的新形势,对《中华人民共和国测绘法》规定的有关概念内涵、管理体制、运行机制、准入制度等的适应性进行了探讨,对进一步修订《中华人民共和国测绘法》提出了建议。  相似文献   

Monitoring Mongolia Gobi dust transport using OMI data     

KeYi Chen  ZhiQiang Peng 《寒旱区科学》2012,4(5):0446-0451

The characteristics of long-distance dust transport from Asia to the United States over the Pacific Ocean are statistically analyzed using OMI AI (Ozone Monitoring Instrument Aerosol Index) data during 2005–2007. The results show that there is a high correlation of AI (the correlation coefficients are as high as 0.83 in March, 0.62 in April and 0.54 in May) between the Mongolia Gobi Desert and the west coast region of the United States (40°–50°N, 120°–130°W), indicating a strong source-receptor area relationship. Through calculating the lag correlation coefficient of the dust propagation time, we determined that the dust propagation time from the Mongolia Gobi Desert to the west coast of the United States is about 6–7 days at the 99% confidence level.  相似文献   

“天绘一号”卫星测绘相机在轨几何定标   总被引：1，自引：0，他引：1  

李晶  王蓉  朱雷鸣  黄海乐 《遥感学报》2012,16(S1):35-39

卫星在空间环境运转过程中, 测绘相机的几何参数会发生不可预估的变化, 从而对摄影测量定位精度和数据处理精度产生影响。因此, 所有测绘卫星都对星载相机的几何参数进行在轨定标, 监测相机几何参数在轨运行状态下的变化情况。本文着重介绍了“天绘一号”卫星在轨几何定标的内容和采用的方法。  相似文献   

“天绘一号”卫星在轨性能评估   总被引：1，自引：1，他引：0  

李岩  陶志刚  李松明  郭志胜  史简  高翠东 《遥感学报》2012,16(S1):40-47

“天绘一号”卫星是中国新一代传输型摄影测量卫星, 由航天东方红卫星有限公司基于CAST2000小卫星平台研制。01星于2010年8月发射成功, 02星于2012年5月发射成功。经过在轨测试, 两颗卫星性能指标均达到设计要求。本文介绍了“天绘一号”卫星在轨性能测试的结果, 为该卫星后续业务化应用提供宝贵数据。  相似文献