Geographical information studies toward forecast of suburban forest change

在“人与环境共生”概念被重视的今天，城郊森林（即毗邻或接近发达地区的森林）的保护是一个备受关注的话题。自古以来，郊区的森林就是人们采集柴火和种植树木的地方。因此，郊区森林的植被只有部分是自然的，并且随着人类活动形式的变化而不断变化。因此，在如何保护郊区森林的辩论中，准确预测郊区森林将如何变化是一个重要因素。本文采用激光雷达传感、多光谱扫描、数字摄影测量、航空影像解译和野外调查等方法对一处郊区森林进行了分析。利用这些技术收集的数据被汇编在一个地理信息系统上，以预测森林未来的变化。研究人员分析了过去50年拍摄的航空照片，以阐明这一时期森林的变化。具体来说，利用数字摄影测量工作站测量的精确数字高程模型（dem）的比较使得估计森林高度的增长成为可能。将来可能将这些结果转化为森林所吸收的二氧化碳量的估计，对于讨论全球环境问题应该是非常重要的。

At a time when the concept of "human and environmental symbiosis" has taken on much significance, protection of suburban forests (i.e. forests adjacent to or near developed areas) is a topic that has drawn much attention. Suburban forests have, since ancient times, been places where people have gathered firewood and cultured trees. As a result, the vegetation of suburban forests is only partially natural and continues to change as the forms of human activity in and around them changes. Accurate forecasts of how suburban forests will change are, therefore, an important element in the debate over how to protect them.In this study, a suburban forest was analyzed with laser radar sensing, multi-spectrum scanning, digital photogrammetry analysis, aerial photograph interpretation, and a field survey. Data gathered using these techniques were compiled on a GIS to forecast future changes in the forest. Aerial photographs taken over the past 50 years were analyzed to illuminate changes in the forest over that period. Specifically, comparisons of precise Digital Elevation Models (DEMs) measured by using digital photogrammetry workstations made it possible to estimate growth in forest height. The possible future conversion of such results to estimates of amounts of carbon dioxide consolidated by forests should be very significant for discussions of global environmental problems.