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Development of the techniques monitoring the forest dynamics at meso-scale using aerial photographs

开发利用航空照片监测中尺度森林动态的技术

基本信息

批准号：
13356003
负责人：
YAMAMOTO Shin-ichi
金额：
$ 29.95万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13356003/
关键词：
aerial photographs digital elevation models forest dynamics GIS OPS long term canopy dynamics meso-scale monitoring リモートセンシングレーザースキャナーギャップ GPS ニホンジカブナ枝葉クラスター

项目摘要

In order to develop techniques monitoring the forest dynamics at meso-scale using aerial photographs, following studies were performed ; 1) development of monitoring techniques by using OPS measurement on the ground survey and the aerial photographs, 2) inclusion of GIS method, and 3) application of these techniques and method to disturbed forested area and forest decline. Digital elevation models (DEM) of canopy surface (at the study sites of Mt.Tatera, Mt.Daisen and Mt.Ontake) and ground surface (only at Mt.Daisen site) were constructed by using aerial photographs. To validate the analyzing method adopted, a test plot, which was included in the study area, with topographic data obtained by ground survey, was used. From the results, the method adopted was ascertained to validate the present analysis. The conclusions of Mt Daisen's study are ; although temporal variation of gap formation and closure was correlated with the frequency and severity of typhoon attack, the results suggest that if the present situation will continue, this old-growth beech stand is going to be a open stand, contrary to previous other studies. GIS (Geographic Information System ; Arc View 3.2a / ESRI) was used for many analyses in this study. Recently, the possibility of determining canopy height by various airborne laser profiling and lidar systems has been examined. However, to date, insufficient data have been acquired using these systems for analyzing long-term canopy dynamics. Therefore, since archived aerial photographs are available for many areas, the method adopted in this study is useful for analyzing longterm canopy dynamics.

为了发展利用航空摄影监测中尺度森林动态的技术，开展了以下研究：1)利用地面调查和航空摄影的OPS测量发展监测技术；2)纳入地理信息系统方法；3)将这些技术和方法应用于干扰森林面积和森林衰退。利用航片建立了冠层表面(塔特拉山、代森山和昂托克山)和地面(仅在代森山)的数字高程模型(DEM)。为了验证所采用的分析方法，采用了研究区内的一块试验田，并利用地面测量获得的地形数据进行了验证。根据计算结果，确定了用来验证本文分析方法的方法。戴森山的研究结论是：尽管林隙形成和关闭的时间变化与台风袭击的频率和严重程度有关，但结果表明，如果目前的情况继续下去，这一古老的山毛榉林将成为开阔的林分，与之前的其他研究相反。本研究使用地理信息系统；Arc View 3.2a/ESRI进行了多方面的分析。最近，各种机载激光剖面仪和激光雷达系统确定冠层高度的可能性已经得到了研究。然而，到目前为止，利用这些系统分析长期冠层动态还没有获得足够的数据。因此，由于许多地区都有存档的航空照片，因此本研究所采用的方法对于分析长期冠层动态是有用的。