Optimization of land use structure based on ecological GREEN equivalent     

Liu Yanfang  Ming Dongping  Yang Jianyu 《地球空间信息科学学报》2013,16(4):60-67

Optimization of land use structure consists of economic and social and ecological optimization. Applying the minds of system engineering and principles of ecology, this paper presents such thoughts: the optimal forest-coverage rate calculated according to the reality of a district is set as main standard of ecological rationality in the district; through considering the value of ecosystem services of the land with GREEN equivalent (mainly cultivated land and grassland) and based on the rule, GREEN equivalent, this paper introduces the area conversion between woodland and cultivated land, also between woodland and grassland; this paper establishes a multi-dimension controlling model of optimization of land use structure. In addition, a multi-objective linear programming model for optimization of land use structure is designed. In the end, this paper tests and verifies this theory of ecological optimization, taking Qionghai city in Hainan Province as an example.  相似文献   

基于AutoCAD的房产基础测绘成图软件设计与实现     

于岱峰  苗晓辉  王召泽 《山东地质》2012,(2):38-40

房产基础测绘为城市房产管理提供最基础的地理信息数据。为满足单位开展房产基础测绘工作的需要,针对房产基础测绘的规范要求,设计实现了一套以AutoCAD为开发平台的房产基础测绘成图软件。该文重点介绍了软件开发过程中的绘图菜单设计、图形图例符号绘制及相应的绘图程序开发工作。  相似文献   

基于C#编程统计地球化学异常特征参数及综合异常评序的方法     

解庆锋  丁汉铎  焦静华  张得恩  杨明 《物探化探计算技术》2012,34(4):497-502

在地球化学勘查项目的资料整理中,应用C#2.0语言编制应用程序,实现批量统计圈定地球化学异常的特征参数及综合异常参数和评序,方法简便,省时、准确。首先建立包含样点坐标和元素分析数据的文本格式文件,将MapGIS软件制作的地球化学异常图及综合异常图的异常边界线转换成"SDTF格式",利用程序读取各元素异常区内的数据,统计其异常面积、平均值、衬度、规模等异常特征参数。再根据程序计算后的综合异常面积、平均衬度、规格化面金属量三个指标对其进行评序,输出统计结果值表,该方法为进一步研究地球化学异常特征提供了数据支持。  相似文献   

高重复率SLR数据预处理方法的实现     

张忠萍  张海峰  高皓  瞿锋 《测绘科学》2011,36(3):172-173,24

千次重复频率SLR技术主要优势是观测数据量犬,从而得到高精度测量结果,相比低重复频率(小于10Hz)测距资料,kHz数据量有近百倍的增加,因而快速、有效对每次每圈卫星kHz资料处理是高重复率激光测距重要内容,以满足ILRS对测距数据及时处理和发送的要求.通过采用均匀选取数据的点图方式,加速数据点屏幕显示;采用Visua...  相似文献   

浅谈建筑工程规划竣工验收地形测量     

汪立峰 《现代测绘》2011,34(6)

本文就目前上海市建筑工程项目规划竣工验收地形测量的精度要求和一般测量方法做一些简要的介绍  相似文献   

快速程序升温-石墨炉原子吸收光谱法测定地质样品中痕量镉     

吴峥  牟乃仓  王龙山  张飞鸽  高登峰  王光照 《岩矿测试》2011,30(2):186-189

建立了快速程序升温-石墨炉原子吸收光谱测定地质样品中痕量镉的分析方法.样品用硝酸-氢氟酸-高氯酸进行前处理,为提高分析效率,改进了石墨炉升温程序,省去了常规方法中的灰化步骤,使测定镉的程序升温时间由常规的90～100 s降至24 s,工作效率显著提高.方法检出限为0.011 μg/g,加标回收率为93.5%～106.0...  相似文献   

Empirical modeling of plate load test moduli of soil via gene expression programming     

Ali Mollahasani  Amir Hossein Alavi  Amir Hossein Gandomi 《Computers and Geotechnics》2011

New empirical models were developed to predict the soil deformation moduli using gene expression programming (GEP). The principal soil deformation parameters formulated were secant (E_s) and reloading (E_r) moduli. The proposed models relate E_s and E_r obtained from plate load-settlement curves to the basic soil physical properties. The best GEP models were selected after developing and controlling several models with different combinations of the influencing parameters. The experimental database used for developing the models was established upon a series of plate load tests conducted on different soil types at depths of 1–24 m. To verify the applicability of the derived models, they were employed to estimate the soil moduli of a part of test results that were not included in the analysis. The external validation of the models was further verified using several statistical criteria recommended by researchers. A sensitivity analysis was carried out to determine the contributions of the parameters affecting E_s and E_r. The proposed models give precise estimates of the soil deformation moduli. The E_s prediction model provides considerably better results in comparison with the model developed for E_r. The simplified formulation for E_s significantly outperforms the empirical equations found in the literature. The derived models can reliably be employed for pre-design purposes.  相似文献   

A hybrid computational approach to formulate soil deformation moduli obtained from PLT     

Seyyed Mohammad Mousavi  Amir Hossein Alavi  Ali Mollahasani  Amir Hossein Gandomi 《Engineering Geology》2011,123(4):324

In this study, new empirical equations were developed to predict the soil deformation moduli utilizing a hybrid method coupling genetic programming and simulated annealing, called GP/SA. The proposed models relate secant (E_s), unloading (E_u) and reloading (E_r) moduli obtained from plate load–settlement curves to the basic soil physical properties. Several models with different combinations of the influencing parameters were developed and checked to select the best GP/SA models. The database used for developing the models was established upon a series of plate load tests (PLT) conducted on different soil types at various depths. The validity of the models was tested using parts of the test results that were not included in the analysis. The validation of the models was further verified using several statistical criteria. A traditional GP analysis was performed to benchmark the GP/SA models. The contributions of the parameters affecting E_s, E_u and E_r were analyzed through a sensitivity analysis. The proposed models are able to estimate the soil deformation moduli with an acceptable degree of accuracy. The E_s prediction model has a remarkably better performance than the models developed for predicting E_u and E_r. The simplified formulations for E_s, E_u and E_r provide significantly better results than the GP-based models and empirical models found in the literature.  相似文献   

Ground penetrating radar inversion in 1-D: an approach for the estimation of electrical conductivity, dielectric permittivity and magnetic permeability   总被引：1，自引：0，他引：1  

O. Lzaro-Mancilla  E. Gmez-Trevio 《Journal of Applied Geophysics》2000,43(2-4)

This paper presents a method for inverting ground penetrating radargrams in terms of one-dimensional profiles. We resort to a special type of linearization of the damped E-field wave equation to solve the inverse problem. The numerical algorithm for the inversion is iterative and requires the solution of several forward problems, which we evaluate using the matrix propagation approach. Analytical expressions for the derivatives with respect to physical properties are obtained using the self-adjoint Green's function method. We consider three physical properties of materials; namely dielectrical permittivity, magnetic permeability and electrical conductivity. The inverse problem is solved minimizing the quadratic norm of the residuals using quadratic programming optimization. In the iterative process to speed up convergence we use the Levenberg–Mardquardt method. The special type of linearization is based on an integral equation that involves derivatives of the electric field with respect to magnetic permeability, electrical conductivity and dielectric permittivity; this equation is the result of analyzing the implication of the scaling properties of the electromagnetic field. The ground is modeled using thin horizontal layers to approximate general variations of the physical properties. We show that standard synthetic radargrams due to dielectric permittivity contrasts can be matched using electrical conductivity or magnetic permeability variations. The results indicate that it is impossible to differentiate one property from the other using GPR data.  相似文献   

Post‐quake decision analysis using dynamic programming     

Gee Liek Yeo  C. Allin Cornell 《地震工程与结构动力学》2009,38(1):79-93

We introduce a general decision analysis procedure based on stochastic dynamic programming in the post‐quake aftershock environment. The damage sustained by the building due to the mainsheet, the time‐varying aftershock rates and the potential for further damage progression in the post‐quake environment are all factors taken into consideration in the proposed methodology. This procedure enables the optimal decision after the mainshock to be selected based on the minimization of expected financial losses, subject to a constraint on a minimal level of individual life‐safety, using a consistent probabilistic framework to explicitly quantify the uncertainties in the variables. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献