重庆市土地利用现状遥感调查与国土资源信息系统应用

应用遥感资料,通过室内遥感信息解译和外业实地调查验证,将土地利用现状遥感解译的作者原图资料和地理、社会经济信息,在统一的软、硬件环境支持下进入国土资源信息系统,利用系统的特有功能,实现了对重庆市土地利用现状与社会经济状况的综合分析.     

兰坪盆地遥感地质及化探综合分析在成矿预测中的应用

在遥感图像目视解译的基础上,对兰坪盆地的线性构造和环形构造做了详细定量分析,结合已知矿床(点) 分布及地球化学异常分析,圈定出了4 个最有利的成矿远景区,这对进一步研究和指导该区找矿十分有用。     

A novel technique for detection of the toxic dinoflagellate, Karenia brevis, in the Gulf of Mexico from remotely sensed ocean color data

Karenia brevis, a toxic dinoflagellate that blooms regularly in the Gulf of Mexico, frequently causes widespread ecological and economic damage and can pose a serious threat to human health. A means for detecting blooms early and monitoring existing blooms that offers high spatial and temporal resolution is desired. Between 1999 and 2001, a large bio-optical data set consisting of spectral measurements of remote-sensing reflectance (R_rs(λ)), absorption (a(λ)), and backscattering (b_b(λ)) along with chlorophyll a concentrations and K. brevis cell counts was collected on the central west Florida shelf (WFS) as part of the Ecology and Oceanography of Harmful Algal Blooms (ECOHAB) and Hyperspectral Coastal Ocean Dynamics Experiment (HyCODE) programs. Reflectance model simulations indicate that absorption due to cellular pigmentation is not responsible for the factor of ∼3–4 decrease observed in R_rs(λ) for waters containing greater than 10⁴ cells l⁻¹ of K. brevis. Instead, particulate backscattering is responsible for this decreased reflectivity. Measured particulate backscattering coefficients were significantly lower when K. brevis concentrations exceeded 10⁴ cells l⁻¹ compared to values measured in high-chlorophyll (>1.5 mg m⁻³), diatom-dominated waters containing fewer than 10⁴ cells l⁻¹ of K. brevis. A classification technique for detecting high-chlorophyll, low-backscattering K. brevis blooms is developed. In addition, a method for quantifying chlorophyll concentrations in positively flagged pixels using fluorescence line height (FLH) data obtained from the Moderate Resolution Imaging Spectroradiometer (MODIS) is introduced. Both techniques are successfully applied to Sea-viewing Wide Field-of-view Sensor (SeaWiFS) and MODIS data acquired in late August 2001 and validated using in situ K. brevis cell concentrations.     

马关金矿遥感影像特征及靶区预测

马关金矿集中区遥感图像显示线一环构造特征，运用数理统计的方法分析线性构造，并研究线一环构造特征与矿床(点)的分布关系，在综合分析地质、遥感、化探信息基础上，优选找矿靶区。     

面向"数字城市"的遥感信息获取与处理系统

随着数字城市的兴起,城市空间信息的快速获取和处理成为"数字城市"建设的关键内容之一.高分辨率卫星遥感和航空遥感因其分辨率高,在城市空间信息的获取和更新上可以发挥独特的作用. 本文对适应"数字城市"的航空遥感信息模块化获取和高分辨率遥感数据处理技术进行了阐述,并通过机载三维成像仪的数据获取,说明航空遥感在数字城市中的作用.     

Response of glacier area variation to climate change in the Kaidu-Kongque river basin,Southern Tianshan Mountains during the last 20 years

Glaciers are crucial water resources for arid inland rivers in Northwest China. In recent decades, glaciers are largely experiencing shrinkage under the climate-warming scenario, thereby exerting tremendous influences on regional water resources. The primary role of understudying watershed scale glacier changes under changing climatic conditions is to ensure sustainable utilization of regional water resources, to prevent and mitigate glacier-related disasters. This study maps the current (2020) distribution of glacier boundaries across the Kaidu-Kongque river basin, south slope of Tianshan Mountains, and monitors the spatial evolution of glaciers over five time periods from 2000–2020 through thresholded band ratios approach, using 25 Landsat images at 30 m resolution. In addition, this study attempts to understand the role of climate characteristics for variable response of glacier area. The results show that the total area of glaciers was 398.21 km² in 2020. The glaciers retreated by about 1.17 km²/a (0.26%/a) from 2000 to 2020. The glaciers were reducing at a significantly rapid rate between 2000 and 2005, a slow rate from 2005 to 2015, and an accelerated rate during 2015–2020. The meteorological data shows slight increasing trends of mean annual temperature (0.02°C/a) and annual precipitation (2.07 mm/a). The correlation analysis demonstrates that the role of temperature presents more significant correlation with glacier recession than precipitation. There is a temporal hysteresis in the response of glacier change to climate change. Increasing trend of temperature in summer proves to be the driving force behind the Kaidu-Kongque basin glacier recession during the recent 20 years.© 2021 China Geology Editorial Office.     

南极海冰遥感现场对比实验

南极海冰区是影响全球气候 -环境变化的关键区域之一 ,卫星遥感资料是获取大区域海冰地球物理特征参数的最有效的手段。但是 ,在南半球晚冬-初春期间 ,卫星遥感反演的海冰资料的误差较大 ,精度较低。 2 0 0 3年 9- 1 0月 ,由澳大利亚南极局组织 ,包括中国等 7个国家 ,1 4个研究单位的科学家参加 ,以澳大利亚破冰船“南极光号”为现场工作平台 ,在东南极季节海冰带 ,通过与美国宇航局 (NASA)、日本宇宙开发促进会合作开展的卫星、飞机、船、冰站立体联合观测 ;对AMSR E等卫星遥感产生的海冰地球物理参数 (海冰密集度、雪盖厚度、海冰物理温度等 )进行地面详细验证 ,建立遥感数据与地面实测数据的统计关系 ,以发现各种卫星资料反演算式的使用范围和局限性 ,为改进卫星资料反演算式提供依据。     

成都市热岛效应与城市空间发展关系分析

利用Landsat卫星影像反演成都市中心城区1992、2001和2009年的地表温度,建筑用地和植被等信息,计算其城市热岛比例指数(URI),对成都市中心城区热岛效应与城市空间发展关系进行了分析。结果表明,在1992-2009年期间成都市主城区范围从91.24km2扩展到403.8km2。成都市建成区的大面积扩展导致了城市热岛空间分布发生迁移,从单中心聚集分布转变为多中心环状分布。回归分析说明,建筑用地和植被都是影响地表温度的重要因素,其中建筑用地与地表温度呈指数型正相关关系,而植被与地表温度呈负相关关系。总的看来,成都市中心城区在这17年间的热岛效应有了明显的缓解,城市热岛比例指数从0.72下降到0.33。城市植被覆盖率的增加和合理的规划对缓解城市热岛效应起到了积极的作用。     

遥感与地震技术探测两淮地区新构造——兼析其与天然地震的关系

新构造的发育情况对于人类生产生活具有重要意义。本文利用遥感及物探（地震勘探）资料对两淮地区的新构造断层进行了解译。对比分析了两者的特点,初步总结了两淮新构造发育的特征,搜集了两淮地区历史上的地震记录,通过对新构造断层与地震记录的空间位置对比,初步分析了新构造活动易致地震的地段及地质原因。本文对于综合采用遥感及地震技术探测新构造具有参考价值,细化后可以为矿山地质灾害防治、巷道布置、城乡规划、地震灾害防治等提供直接的、详实可靠的有关新构造断层的地质资料。