基于数据库的温室环境决策支持系统的设计与实现

用Delphi6．0编写构建了温室环境的决策支持系统。系统中的知识库、模型库和数据库以数据库为基础，采用Database Desktop来设计，有助于系统对知识、模型和相关数据的管理。对系统决策的过程采用基于数据库的方法进行编写，解决了温室环境智能决策过程中推理困难的问题，同时提高了决策的准确程度。     

基于GIS的农村土地流转问题研究

应用GIS进行农村土地流转问题的研究是今后农村土地利用管理与研究的方向，可以实现空间数据与属性数据的有机结合，直观反应区域农地流转的规律性和趋势。为此。介绍了基于GIS的农地流转内容与技术流程、农地流转资料的分析与数据编码、农地流转的地理分布分析与动态监测等内容。     

地理信息系统在环境影响评价中的应用

为了研究地理信息系统（GIS）在环境影响评价中的应用，在介绍地理信息系统的组成、类型、功能和应用领域的基础上，分析了GIS技术在环境影响评价中的优势，并结合实例，探讨了地理信息系统在水环境影响评价中的具体应用过程。     

基于GIS技术的小型水库规划方法

在小流域治理中，为了提高水库规划的精确度和速度，提出了基于GIS技术来实现小型水库规划的方法。主要是基于GIS技术的库客曲线的制作方法；小型水库规划的可视化。在GIS中，真实地形在计算机中的表达用数字高程模型(DEM)表示，水库规划的三维可视化环境的实现需利用0penGL技术。     

地理信息系统在林业上的应用现状及其前景

在概述地理信息系统(GIS)的概念、功能、应用领域的基础上，对GIS在林业资源管理与动态监测、林业专题图编制、森林经营与林业工程规划、森林病虫害管理、森林防火、林业地理信息系统的建立以及林业其他方面的应用现状进行了综述，并对GIS在林业中的应用前景进行了探讨，指出地理信息系统在林业上应用研究的重要性。     

Quantitative Mapping and Assessment of Environmentally Sensitive Areas to Desertification in Central Iran

Desertification is one of the main environmental and also social and economic problems facing Iran. Seventeen out of 31 Iranian provinces, which are home to approximately 70% of the total population, are affected by desertification. This study aimed to use geographic information system (GIS) and fuzzy logic for mapping environmentally sensitive areas to desertification based on Mediterranean Desertification and Land Use approach in Isfahan province, central Iran. Six desertification indicators including climate, soil, vegetation, soil erosion, groundwater, and management and policy quality were used to determine various types of environmentally sensitive areas to desertification. Seventeen desertification indices affecting the quality of each indicator were spatially mapped and assigned a value between 0 and 1 using a fuzzy logic option of ArcSDM3 software in GIS environment. Results showed that a 21·7% of the study area was classified as critical, 70% as fragile and 5·5% as potential, and 2·9% of the area was not affected by desertification. In the town of Borkhar, 64·2% of the area was classified as critical, followed by the towns of Isfahan and Nayin with 40·2% and 31·8%, respectively. Results at provincial scale indicated that the climate indicator and humidity index with a weighting mean of 0·71 and 0·77 were the most affective factors in the desertification of the study area. The developed model in this study can be used for mapping desertification status in other 16 provinces that contain desert areas. These assessments provide a GIS‐based desertification database that Iran as a member of the United Nation Convention to Combat Desertification can use to report the condition of desertification at national scale. Copyright © 2013 John Wiley & Sons, Ltd.     

Spatial Assessment of Land Degradation Risk for the Okavango River Catchment,Southern Africa

The Okavango catchment in southern Africa is subject to environmental as well as socio‐economic transformation processes such as population growth and climate change. The degradation of soil and vegetation by deforestation and overgrazing is one of the downsides of this development, reducing the capacity of the land to provide ecosystem functions and services. In this study, climate simulations are brought together with secondary socioeconomic, pedologic and remote‐sensing data in a GIS‐based assessment of the factors commonly associated with land degradation risk. A high resolution overview is provided for decision‐makers and stakeholders in the region by identifying priority intervention areas where a long‐term decline in ecosystem function and land productivity is most likely to occur. The approach combines 19 risk factors into seven individual ratings for topography, landcover, soil, demography, infrastructure, livestock pressure and climate. These ratings are then weighted and combined into an integrated degradation risk index (DRI). The results show that the land degradation risk is quite heterogeneously distributed in the study area and caused by different factors. Three hot‐spots are identified and compared, one of which is in the far northwestern part of the catchment, one around the local center Rundu and one on the outskirts of the Okavango Delta. We conclude that the approach is suitable to give an overview on degradation risk in the study area, although the classification process is a crucial procedure that should be standardized for further research. Copyright © 2015 John Wiley & Sons, Ltd.     

ArcGIS软件自动分幅出图的实现

以ArcGIS软件为平台,通过编写VBA代码解决了自动分幅出图的问题。经验证,生成选择图幅号的打印布局按钮的VBA代码运行良好,可以精确、流畅地实现自动分幅出图,有一定的推广价值。     

Identification of SSR loci in <Emphasis Type="Italic">Betula luminifera</Emphasis> using birch EST data

Expressed sequence tags(ESTs) are generated from single-pass sequencing of randomly picked cDNA clones and can be used for development of simple sequence repeat(SSR) markers or microsatellites.However,EST databases have been developed for only a small number of species.This paper provides a case study of the utility of freely available birch EST resources for the development of markers necessary for the genetic analysis of Betula luminifera.Based on birch EST data,primers for 80 EST-SSR candidate loci were ...     

基于WebGIS的校园电子地图的设计与实现

随着GIS系统应用的普及,校园电子地图也逐渐得到关注。以某高校为例,设计和实现了具有动态地图操作(如放大、缩小、浏览)功能的万维网校园电子地图。校园电子地图的开发中主要使用的是ArcGIS技术。基于ArcGIS技术开发的校园WebGIS系统,是实现校园空间信息发布与服务的基础平台。