高分辨率卫星影像中阴影的自动提取与处理

高分辨率卫星遥感影像开创了许多新的应用领域，但影像中的阴影是一个必须解决的问题。一方面，它给象影像分类这样的一些应用带来了很大麻烦，另一方面，它提供了物体的高度信息。本文利用纹理分析的方法，通过共生矩阵和相应指数的计算，对高分辨率卫影像中阴影的自动提取与处理作了一个尝试并给出了一些结果。     

基于信息块法的矢量符号库的建立和符号化实现

基于试验成果，详细介绍了基于信息块法的矢量地图符号库的建立和空间信息的符号化。     

基于新型机载多角度传感器AMTIS的LAI反演

以实地测量数据为先验知识,利用AMTIS数据对顺义地区的一块小麦地进行了叶面积指数(LAI)反演实验研究,并用实地LAI数据进行了验证。通过利用实测数据作为模型参数,以及对干湿土壤分类和匹配表的调整,使反演结果和反演速度得到了提高。     

应用RMi法估算岩体变形模量

RMR法与Q法是国内外八、九十年代岩体质量和参数估算的常用方法,然而RMR法和Q法对质量较差的岩体不太实用,而RMi法是一种既适用于软岩又适用于硬岩的岩体质量评价和参数估算方法。本文在介绍RMi法基本原理的基础上,对贵州省鱼简河水库坝基岩体变形模量进行确定。     

Reliability based risk index for the design of reinforced earth structures

The design methods currently used for earth reinforcement are mostly based on deterministic properties of both the soil and the construction materials used. Nowadays, however, the general trend is designing at a specific degree of reliability. This is even more true where the raw data such as soil properties exhibit significant variation. Deterministic solutions, in this case, may not suffice. Therefore, this paper will attempt to use probabilistic formulations thereby modifying the existing design procedure of reinforced earth retaining walls to account for uncertainties and variabilities. Through a first order Taylor's series expansion about the mean, the mean and variance of the strip reinforcing components, namely width and length, are derived in terms of the variations in the soil properties. Design charts that enable estimation of both mean and variance are developed to avoid extensive partial differentiation involved in the computations. Using appropriate probability distributions along with the mean and variance, the final design outputs are determined for a selected failure probability by introducing what is refered to as 'risk index'. The results indicate that the risk index increases with an increase in the coefficient of variations and a decrease in failure probability. Furthermore, it is shown that in some cases, depending on the variabilities of the soil properties, the classical design technique produced a relatively high failure probability. This revised version was published online in July 2006 with corrections to the Cover Date.     

Are catch-up reefs an artefact of coring?

Drill cores through modern coral reefs commonly show a time lag in reef initiation followed by a phase of rapid accretion to sea level from submerged foundations – the so-called ‘catch-up response’. But because of the difficulty of drilling in these environments, core distribution is usually restricted to accessible areas that may not fully represent reef history, especially if the reef initiated in patches or developed with a prograde or retrograde geometry. As a consequence, core data have the potential to give a misleading impression of reef development, particularly with respect to the timing of initiation and response to sea-level rise. Here, we use computer models to simulate keep-up reef development and, from them, quantify variations in the timing of reef initiation and accretion rate using mock cores taken through the completed simulations. The results demonstrate that cores consistently underestimate the timing of reef initiation and overestimate the reef accretion rate so that, statistically, a core through a keep-up reef will most likely produce a catch-up pattern – an initiation lag followed by a phase of rapid accretion to sea level. This implies that catch-up signatures may be an artefact of coring and that keep-up reefs are significantly more common than previous core studies claim.     

兰州市人体舒适度预报系统开发研制

利用兰州市197l-2000年气象资料，统计分析各气象要素的变化规律，并探讨其对人体舒适度的影响。在国内外人体实验和有关研究方法基础上，结合本地特殊的气候状况，建立了与人体舒适度有关的8个指数的计算方法和相应的预报等级，并在预报实践中进行了效果检验和参数订正，可以满足兰州市气象指数预报业务的需要。     

浅析啤酒销售与气象要素的关系及预测

利用1997年1月-2002年6月兰州市某大型啤酒企业啤酒销售资料与同期兰州市气象要素资料，分析气象要素对啤酒销售的影响。分析结果表明，温度是影响啤酒销售量最显著的气象因子。两者具有很好的相关性。采用最小二乘法建立啤酒销售量的月及逐日预报方程。并提出啤酒指数的概念。     

基于资源卫星图像对NDVI进行大气修正的一种简单方法

在遥感应用领域，植被指数己被广泛用来定性和定量表征植被覆盖度及其生长状况。由于大气变化的影响，使植被指数未能真实反映地表植被的真实分布状况，造成其应用的局限性。提出了一种简易方法，仅通过中巴资源卫星(CBERS：China Brazil Environment Resoure Satellite)图像的第3、第4波段中的水体，推算卫星接收到的大气程辐射，消除了大气对归一化植被指数(NDVI：Normalized Differece Vege—tation Index)的影响，减小植被指数所受的大气影响。应用结果表明，该方法能使植被指数较好地反映植被的生长及分布状况。     

广西异常暴雨天气事件之异常指数初探

对广西异常暴雨天气事件之“异常指数”的设置进行了初步探讨，提出暴雨天气事件中过程日最大暴雨范围，过程持续时间，过程强降雨，特强降雨发生范围等四项异常分指数，然后统计同一过程分指数之和，得总指数，在此基础上分别选出了4－10月各月广西异常暴雨天气事件。