共查询到19条相似文献，搜索用时 406 毫秒
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介绍ArcSDE空间数据库引擎及Geodatabase地理数据库模型的概念及特点.从数据库内容、数据库逻辑设计、数据存储方式等方面进行了设计.对数据库UML建模、数据入库的方法及流程等进行了论述.认为基于ArcSDE和Geodatabase的森林资源空间数据库能从理论上保证数据的完整性和共享性,提高数据存储及管理效率. 相似文献
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为实现动态管理贵州省林地保护利用规划数据,构建空间地理信息技术设计贵州省林地保护利用规划中的应用流程,建立贵州省林地保护利用规划空间数据库建设的方法技术。以贵州省林地保护利用规划为例,开发基于ArcSDE的Geodatabase地理数据模型,该成果已用于贵州省林地保护利用规划的研究和编制,并可为全国林地保护利用规划数据管理提供支持。结果表明：空间数据库的建设能改善贵州省林地保护利用规划中由于林地分散地域范围广、数据量极大而带来的信息利用问题。 相似文献
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基于自然保护区数据特点,通过统一数据标准、拓扑检查及修正、GIS数据库逻辑模型设计、地图符号设计与测试等主要技术方法对自然保护区地理空间数据整理建库并可视化。整合了多源异构地理空间数据,研究了矢量地图符号设计的理论与方法,设计了地图符号可视化测试工艺,并在此基础上完成了地图模板的制作。在辽宁蛇岛老铁山国家级自然保护区选取保护区范围及功能区划、珍稀鸟类分布两个专题进行了实例验证,结果表明:提出的关键技术能够为自然保护区数据空间可视化和科学利用提供支持,并且地图数据分析结果为自然保护区精细化管理提供了参考。 相似文献
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一、完善全省林业信息化网络。全面启动"数字林业"工程建设。总目标是:以全省森林资源二类调查数据、全省森林资源连清数据、全省基础地理空间数据为主体,建立森林资源主题数据库和资源动态数据库;逐步扩展,整合各类林业信息资源,建立各专题数据库。实现数字林业系统中涵盖129个 相似文献
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本文所述采用先进的微机技术，建立了湖北省森林资源管理信息系统，能准确，及时，迅速地掌握森林资源的动态，全程序采用Ｆｏｘｂａｓｅ数据库语言设计，建立了５个数据库，６个模块，具有完整系统地进行数据的输入，修改控制，查询显示，数据整理计算，打印等功能，本系统汉字处理功能强，设计友好的人机对话界面，深受广大用户的欢迎。 相似文献
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"地理大数据"课程是2018年北京林业大学面向自然地理与资源环境专业本科生增设的一门学位课程。针对"地理大数据"课程教学内容交叉性强、教学方式不确定等特点,探讨了该课程教学改革的思路。具体从以下3个方面实施:①基于前沿话题式引导,开展以问题讨论与交流为主的互动式专题教学;②建立"地理大数据"课程资源数据库,鼓励并督促学生丰富该课程数据库内容;③建立多元化的"地理大数据"课程考核评价体系。通过探讨"地理大数据"课程教学模式的改革,强化了与其他学科知识的交叉融合,提高了学生解决实际问题的能力,为社会输出了实用型人才。 相似文献
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论述关系型数据库存的层次结构和对偶结构,认为在传统的GIS系统中,空间及属性数据的管理应用模式在大规模、多层次的项目数据管理中的采集、管理、应用等脱节,数据的更新和维护困难.为此,在开发自然保护区信息管理系统时,建立了基于关系型数据库的地理数据模型.并对其构成、地理数据与属性数据的逻辑组织、一体化作了论述. 相似文献
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以前有关小班数据更新方面报道是以人工林为例 ,在 DOS操作系统下 ,对 d Base数据库进行管理和运作 ,但存在一些问题 :( 1) d Base之类的数据库直接在 PC根目录下运行。它们只有一种数据库格式 ,主要是针对单用户存取的 ,在安全性、数据完整性上功能较差。 ( 2 ) DOS环境下开发的软件使用繁琐 ,可操作性差。 ( 3)数据是单用户存取 ,浪费大量资源 ,难以实现数据共享 [1,2 ] 。天然林由多林种组成 ,其小班数据更新比人工林更新繁杂 ,国内在天然林资源如何更新 ,尚处于探索阶段。目前 ,国内林业系统所用计算机多平台并存、数据库类型不一。… 相似文献
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《Forest Ecology and Management》2007,238(1-3):107-117
The decision to transform “classical” age-class forests (plantation forestry) into more nature-based forest stand structures implied a paradigmatic shift in the Danish state owned forests and their management. In order to facilitate this process of change, scientists were employed by the Danish Forest and Nature Agency which enabled interactions with the professionals in the forest over a nearly 2-year period. Very soon it became evident that the main questions were not so much related to the process of shifting from age-class forests to nature-based management, but more to the evident lack of settled long-term goals in terms of stand structure and dynamics of the “future” forests. Realizing this constraint, forest development types (FDT) and their illustration by means of profile diagrams were elaborated in an adaptive, participatory process involving people both inside and outside the organisation. FDT describes long-term goals for forest development on a given locality (climate and soil conditions) in order to accomplish specific long-term aims of functionality. It is based upon an analysis of the silvicultural possibilities in combination with the aspirations of future forest functions. It will serve as a guide for future silvicultural activities in order to “channel” the actual forest stand in the desired direction.Looking through the lens of “social learning” this paper reflects on and discusses the participatory, bottom-up process in which the knowledge of professionals and scientists was mixed in the development of long-term goals for stand structures and dynamics in nature-based forest management. Specifically, the use of FDT scenarios and their illustration by means of profile diagrams as tools to organise and ease communication in this learning process is addressed and presented as an integrative, flexible and easily comprehensible concept for communicating long-term goals for stand development in nature-based forest management. 相似文献
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Regenerating forest stands through natural seedlings is a commonly accepted silvicultural strategy in Germany. To plan for and increase natural regeneration within a given stand, foresters must be able to estimate whether the stand in its current state can produce sufficient saplings to replace the overstory. In this paper, we present two approaches to building a model that can estimate the probability of natural regeneration occurring, based on variables that are typically readily available from forest inventories. To estimate model parameters we used the large database of the third National Forest Inventory, which covers forest stands and sites across the whole of Germany, as well as weather and soil data. We examined how these variables impact the emergence of natural regeneration, ultimately fitting a model that can predict the occurrence of natural regeneration in 72% of cases. The influence of the variables on the predicted occurrence of natural regeneration was mixed, with most stand variables contributing only minor impact and most likely influencing natural regeneration via complex interactions. The exception was vertical structure (number of stand layers), which accounted for a large proportion of the goodness-of-fit of the model. An important finding was that forest ownership structure is a key variable for the prediction of the presence of regeneration. Data from this study support the assumption that some forest owners manage their stands in a way that fosters natural regeneration. 相似文献
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《Scandinavian Journal of Forest Research》2012,27(1-4):65-73
A method is presented for prediction of the present net value (PV) of timber production, based on satellite data and subjectively inventoried forest stand data. Multiple regression analysis was used for predicting the PV. This method has the advantage that predictions of the PV can be made using any kind of existing stand data. The precision of the estimate of the PV, however, depends on the information available in the forest stand database. In the study a combination of Landsat TM data and subjectively inventoried site‐index explained about 75% of the variance, which was equal to the case when all subjective ground stand data, excluding TM data, were used to predict PV. This result and results from other data combinations suggest that Landsat TM data might be useful for forest management planning. 相似文献
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中国森林资源信息管理:历史、现状和发展趋势 总被引：1，自引：0，他引：1
文中简述了20世纪60年代以来中国森林资源信息管理的发展历程, 介绍了森林资源信息管理的内容、手段和技术, 变化信息采集方法与技术, 以及保留小班林分林木因子更新方法的演变, 展望了今后的发展趋势。 相似文献
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长白落叶松是辽宁省主要造林树种之一,其总体质量关系到辽宁省的生态环境建设。文章根据辽宁省森林资源连续清查数据主要调查因子,基于103块调查样地建立林分生长模型,分析林分生长规律。关于模拟林分生长模型,经典的线性模型往往未能解释数据的离散部分;然而,一些离散变量真正影响林分生长。文中将林分生长特性和林木材积的关系作为一个案例研究,通过分析属性,提出了用广义线性模型分析林分生长数据。 相似文献
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3S技术在江苏市级森林覆盖率监测中的应用研究 总被引：1，自引：0，他引：1
针对"绿色江苏"建设和全面建设小康社会对市级森林覆盖率指标考核的实际需要,提出以省辖市为单位,按照4 km×1 km网进行固定样地加密调查,并采用GPS对地面样地进行定位、导航,利用GIS提取样地数据、精确布点和制图,辅助运用RS进行遥感卫片判读,使用数据库功能对全省调查数据进行逻辑检查、数据处理与统计汇总,综合集成应... 相似文献
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