共查询到19条相似文献,搜索用时 171 毫秒
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传统的林业遥感图像计算机分类方法,多作为目视判读的一种辅助手段,对数字图像数据本身进行分类。在这种分类过程中,各种辅助数据及林学家、图像判读员的经验和知识一直未能得到直接充分有效的利用。通过建立专家系统可将上述各种辅助数据和专家知识直接加入计算机分类的过程,以达到在一定程度上取代目视判读的目的。本文讨论了一个小型林业遥感图像分类专家系统的总体设计、数据库设计、信息综合、推理方法以及用此系统对一TM图像进行实际分类的初步结果。 相似文献
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遥感技术在红树林资源调查中的应用 总被引:10,自引:1,他引:10
邓国芳 《中南林业调查规划》2002,21(1):27-28
简述了广西钦州市在红树林资源调查中遥感图像的处理与使用方法 ,为在全国全面开展红树林调查选择正确的调查方法和遥感信息源进行了有益的尝试 相似文献
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专家系统就是把专家的知识技能和经验输入电子计算机,按照编制的特定程序软件,通过电子计算机处理,给用户和咨询者提供关于该问题的合理咨询和决策。同时,按用户和咨询者的需求,该系统还具有检测、推理和直接提供信息资料的功能。由于雇员的离职和退休,工厂企业需要他们的知识、技能和经验。专家系统可以帮助把这些专门知识储存起来,应用于故障诊断和维修领域。于是TexasA&M大学林学系农业实验站,1989年开发出车床专家系统(LES)。在日本,1990年又开发出汽车空调压缩机故障摄影专家系统。表1部分地列出了全世界主要的有关故障诊断和维修的专家系统。专家系统和专家是有根本区别的。专家系统是模拟人的思维过程的计算机程序,它不能包括普通数学、物理和化学等知识,也不包括某一特殊设备的故障诊断和维修,它缺乏专家的推理和想象能力。表2对专家系统和维修工程师的特点进行了比较。未来的诊断故障和维修专家系统应能同工作过程实时操作,还应扩大监测、诊断和维修的功能,并图示化。图3就是其流程图。 相似文献
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结合GIS的遥感专题地图编制与应用 总被引:10,自引:0,他引:10
探讨了如何利用地理信息系统技术和遥感技术编制遥感专题地图的技术方法和过程,并对遥感图像处理、地图数字化、图像几何精校正和遥感专题地图的应用等问题作了详细论述。 相似文献
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基于深度学习特征和支持向量机的遥感图像分类 总被引:1,自引:0,他引:1
随着遥感图像采集技术的迅速发展,传统的遥感图像处理方法已经不能满足当前实际的生产需要。近年来,深度学习模型的流行为遥感图像分类问题的解决提供了新的途径。因此,为了进一步提升遥感图像的分类精度,笔者提出了一种基于深度学习特征和支持向量机(support vector machine,SVM)的遥感图像分类模型。首先,针对深度学习模型需要海量训练数据的特点,运用旋转、剪裁等方法对原始的遥感图像进行数据扩增;然后,将扩增数据按照种类随机地分为训练集和验证集两部分测试集,并使用训练集和验证集训练改进的针对遥感图像分类问题的卷积神经网络(convolutional neural network,CNN)中的参数,进而在训练好的CNN模型上提取第一部分测试集的深度学习特征;最后,使用第一部分测试集的深度特征训练多分类SVM,并对第二部分测试集图像进行分类验证。实验采用NWPU-RESISC45公共数据集对本研究模型精度进行验证,与现有的遥感图像分类方法相比较,实验结果表明,提出模型的总体分类精度有明显提升,从而验证了方法的有效性和实用性。 相似文献
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一个基于Web服务器的分布式面向水源保护林造林设计的专家系统。从水源保护林的造林设计需求,专家知识的表示,数据库的建立,推理引擎的驱动,客户端界面的设计等方面介绍了系统的实现。 相似文献
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Scenic quality must be assessed in forests for which recreational opportunities have become more important then traditional
wood products. Current assessment methods focus on quantitative evaluations that provide digital information to the users.
Usually, people prefer more explicit information (i.e., categorical data) than detailed quantitative data on scenic quality assessment. This paper employed fuzzy-logic terminology
to define the scenic information of forests, and then tried to develop an expert system for evaluating scenic quality based
on fuzzy reasoning. Results showed that a fuzzy-logic-based expert system using a qualitative model labeled with linguistic
terms, makes scenic beauty evaluation intuitive and understanding easy by viewing the categorical physical features of forests.
This research developed a methodology of building an expert system in this area. It is capable of providing an efficient and
useful tool for forest recreation users and forest managers. 相似文献
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介绍了基于森林防火专家系统的知识表示、知识获取和知识库组织的基本原理和方法,阐述了一种基于网络的知识库构建的一种新方案,使推理机的设计实现容易、知识库的维护更加灵活,实现了知识的获取功能以及网络多用户访问时的并发控制功能,克服了传统专家系统的弊端。 相似文献
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Merrill E. Warkentin P. K. R. Nair Stephen R. Ruth Kristopher Sprague 《Agroforestry Systems》1990,11(1):71-83
Computer-based Expert Systems that use knowledge, facts, and reasoning techniques to solve problems, normally requiring the abilities of human experts, are increasingly being used in many activities. The United Nations University (UNU) Agroforestry Expert System (AES) is a first attempt to apply this technique to agroforestry. UNU-AES is a prototype Knowledge-Based Expert System (KBES) designed to support land-use (agricultural, forestry, etc.) officials, research scientists, farmers, and individuals interested in maximizing benefits gained from applying agroforestry management techniques in developing countries. This prototype addresses the options for alley cropping, a promising agroforestry technology which has potential applicability when used under defined conditions in the tropics and subtropics. Alley cropping involves the planting of crops in alleys or interspaces between repeatedly pruned hedgerows of fast-growing, preferably leguminous, woody perennials. The primary benefits from this technique include nutrient enrichment, soil improvement, and erosion control. UNU-AES, which is the first known attempt at the application of expert system procedures in the field of agroforestry, uses a total of 235 decision rules to develop its recommendations. With the inclusion of more climatic and socio-economic data and improved advisory recommendations, UNU-AES can be expanded to provide advice on alley cropping in more diverse geographical and ecological conditions and eventually address other agroforestry techniques. 相似文献
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Proper matching of forestry machinery is important when raising mechanization levels for forestry production. In the matching process, forestry machinery needs not only expertise, but also improved methods for solving problems. I propose combination of case-based reasoning (CBR) and rule-based reasoning (RBR) by calculating the similarity of quantitative parameters of various forestry machines in an analytical and hierarchical process. I calculated the similarity of machin-ery used in forest industries to enable better selection and matching of equipment. I propose a weight-value adjusting method based on sums of squares of deviations in which the individual parameter weights were modified in the process of application. During the process of system design, I put forward a design method knowledge base and generated a dynamic web reasoning framework to integrate the processes of forest industry machinery selection and weight-value adjustment. This enables expansion of the scope of the complete system and enhancement of the reasoning efficiency. I demonstrate the validity and practicability of this method using a practical example. 相似文献