CamFlores: A FLORES-type model for the humid forest margin in Cameroon

A FLORES-type model in the Simile modelling environment is being developed for three villages in the Humid Forest Benchmark area of southern Cameroon. The modelling project seeks to investigate the effects of introduction of new crop varieties and improved farming systems on the long-term maintenance of stable mosaics of forest and agriculture, within the context of the international Alternatives to Slash and Burn programme. Biophysical data have been collated, and socio-econnomic and tenure data have been acquired in spatially-explicit ways. Maps of land-cover at village and benchmark scale are being prepared from detailed and semi-detailed satellite imagery, using a nested legend system that allows linking of maps at different scales. These data enable the initial construction and parameterisation of the model, and will permit the extrapolation of the results of modelling from the villages to the benchmark, and ultimately to the whole of the Congo Basin humid forests. The prototype version of the model involves 10 households and about 500 land patches, and includes the three agricultural systems dominant in the southern more forested portion of the Benchmark (mixed food-fallow systems, forest melon fields, cocoa plantations) with no rental, sale or other transfer of land. Decision-making at the household level is essentially modelled deterministically, and labour productivity is assumed to be constant between households. This model is now complete, and once it has been adjusted and suitably parameterised, it will be applied to real data from the three test villages. This will require the addition of new farming systems, the introduction of modes of permanent or temporary transfer of land, and modification of the decision model to render it more realistic. The work described in this paper is a part of a project funded by the European Union through ICRAF and hosted at the IITA Humid Forest Ecoregional Centre, Cameroon. The assistance of Valentina Robiglio (JPO GIS specialist), especially in preparation of land-cover maps and in collection of socio-economic data, is gratefully acknowledged, as is the work of IITA ASB village facilitators in collection of field data. The cooperation of IITA, IRAD, CIFOR and ICRAF scientists in providing data for the model and periodically reviewing progress with the modelling process was essential to the progress achieved thus far.     

基于GIS的福建省漳浦县森林资源分析

文章以漳浦县森林资源为对象，应用GIS技术，通过制作各类专题图，获取漳浦县森林的空间分布格局与结构组成信息，应用GIS的叠加、缓冲、统计等空间分析功能，探讨了土壤、地貌、坡度和海拔等地形特征因素对树种分布的关系。     

乡级林业地理信息系统的数据库设计

在建立乡级林业地理信息系统（ＧＩＳ）过程中，最主要的工作是设计并建立森林资源数据库。使用通用ＧＩＳ软件（ＰＣＡＲＣ／ＩＮＦＯ）和数据库管理系统软件（ＬＯＴＵｓ１－２－３）设计森林资源数据库主要包括５个步骤：（１）将用户的观点模型化；（２）定义实体及其关系；（３）实体表示；（４）匹配成ＡＲＣ／ＩＮＦＯ的数据模型；（５）组织成地理数据集．     

WINGIS面状图栅格数据向矢量数据转换方法研究

通过对栅格数据结构的分析，采用在栅格点间插入边界点，将栅格数据转换成边界点栅格数据，边界点的取值非０即１。且其最大的方向数为４；根据边界点的方向数，设置搜索成线过程的起点和终点，搜索成线过程沿着方向数为２的边界点方向进行，完成搜索成线后，对线进行多余点处理及圆滑处理；然后进行多边形及其标志点的生成，建立面状图的拓扑关系并回填属性值，从而完成了包含拓扑关系及其属性的栅格向矢量数据转换。     

Relationship between landslides and lithology in the Three Gorges Reservoir area based on GIS and information value model

Development of landslides in the Three Gorges Reservoir area is related to many factors. Lithology is one of the indispensable internal factors, besides relative height differences, slope gradients and slope profiles. We used an information value model with geographical information system (GIS) technology to study how lithology contributes to the development of landslides from the Yunyang to Wushan segment in the Three Gorges Reservoir area and we quantify the relationship between lithology and development of landslides. Via an investigation of 205 examples of past landslides, we found that the lithology of J_3s, J_3p and T_2b contributes most. Our research results can provide a valid basis for future construction in the Three Gorges Reservoir area. __________ Translated from Journal of Beijing Forestry University, 2007, 29(6): 138–142 [译自: 北京林业大学学报]     

地理信息系统在森林资源管理与监测中的应用

在分析传统森林资源管理与监测的不足及利用地理信息系统(GIS)的优势的基础上，探讨了GIS在森林资源管理与监测中的应用，并指出建立以“3S”一体化的森林资源管理与监测体系是未来发展的必然趋势。     

地理信息系统GIS及其在内蒙古林业勘察设计院的应用

地理信息系统 ( GIS)作为信息化产业重要支柱之一 ,可将地理时空数据在遥感 RS、全球定位系统 GPS一体化基础上进行系统集成 ,呈应用服务面极广的信息产业 ,具有巨大的市场潜力。也是综合国力的一个方面。内蒙古林业勘察设计院地理信息系统 GIS的应用还属刚刚起步 ,需要继续加强新技术的开发和应用人才的培养 ,以提高内蒙古林业勘察设计院高新技术的应用水平 ,并促进科技进步 ,为内蒙古林业勘察设计院创造更好的经济效益 ,为我国林业事业的发展做出贡献     

From Experience-Oriented to Quantity-Based: A Method for Landscape Plant Selection and Configuration in Urban Built-Up Areas

Sunshine is the key ecological factor for the growth, development, and reproduction of all green plants. Experience-oriented methods are the main approach in the stage of plant selection and configuration for landscape planning and design. However, our survey showed that this approach is unreliable in complex built-up environments. The objective of this research was to find a sound strategy for the selection and configuration of landscape plants, thereby ensuring their healthy growth and development. In this research, we adopted a geographic information system (GIS) as the technological platform, combined with a sunshine simulation and evaluation model, and a landscape plant database. The system can automatically retrieve and match landscape plants for different levels of solar radiation at specific geographic sites. This quantity-based assessment of the solar environment can overcome the drawbacks of the experience-oriented approaches, and can be used for landscape plant selection in the early stages of landscape planning and design, and also for their conservation and replacement.     

Fire models and methods to map fuel types: The role of remote sensing

Understanding fire is essential to improving forest management strategies. More specifically, an accurate knowledge of the spatial distribution of fuels is critical when analyzing, modelling and predicting fire behaviour. First, we review the main concepts and terminology associated with forest fuels and a number of fuel type classifications. Second, we summarize the main techniques employed to map fuel types starting with the most traditional approaches, such as field work, aerial photo interpretation or ecological modelling. We pay special attention to more contemporary techniques, which involve the use of remote sensing systems. In general, remote sensing systems are low-priced, can be regularly updated and are less time-consuming than traditional methods, but they are still facing important limitations. Recent work has shown that the integration of different sources of information and methods in a complementary way helps to overcome most of these limitations. Further research is encouraged to develop novel and enhanced remote sensing techniques.