Recovery of Greenery in a Suburban Detached Housing Area —— Aspects of Greenery Landscapes ——

Abstract

Greenery is on the increase with the growth of trees in urban areas. It is important to clarify levels and limiting factors of greenery for satisfaction of the residents. The purpose of this study was to examine the growth of greenery as the percentage of greenery in the field of vision. It is difficult to measure changes in tree height overtime by the ratio of green coverage. Visible greenery is measured by photographs. We can determine the area of vegetation by differences in the wave lengths in two photographs, near-infrared and visible light photos, because chlorophyll absorbs visible light wavelengths and reflects near-infrared light wavelengths. We surveyed housing estates in the present. It was difficult to make long-term observations and surveys from previous years so we made a comparative analysis of a number of areas that differed in the age of development. As a result, the percentage of visible greenery increased where housing estate areas were developed. Visible greenery percentage is affected by the ratios of housing and building areas. In addition, roadside trees or public parks contribute to the percentage of regional visible greenery. We verified that visible greenery is affected by urban land utilization, but the passage of time contributes to greenery more than urban land utilization. At present, green recovery lies in the hands of the growth of greenery in urban areas. Residential estates were developed from around 1960, about 50 years ago, so this period isn't long enough to survey the growth of greenery. We propose that high trees, plant fences, trees planted as a wall or fences that allow people on the street to see private gardens can contribute to greenery in the field of vision.JFL Classification: O18, O21, P28