报 告 人：颜景理  鲁汶大学  博士后

时    间：2021年6月2日 (星期三) 12:40-14:00

地    点：农生学院创新楼（B楼）104会议室

主办单位：农生学院学科与科技办、农生学院青年教师联谊会

报告题目：城市绿地景观的遥感监测

报告摘要：

城市化进程是表征社会进步和经济发展的重要指标。然而在城市化进程中，人口增长、经济发展、资源能源消耗和人工表面扩张共同导致了一系列的城市景观的高度异质性和环境恶化问题。城市绿地作为城市生态系统的重要组成部分，对居民的生存环境起着不可替代的作用。同时城市绿地提供的多种生态服务价值与绿地的景观格局高度相关。因此，准确描绘城市绿地的组成和格局是揭示城市生态过程和评估绿地服务价值的重要前提。近年来，随着遥感技术的发展，越来越多的高分辨率的遥感影像产品被广泛应用于城市绿地的监测，进一步拓宽了遥感监测在城市生态系统中的应用。

报告人简介：

报告人博士毕业于中科院生态环境研究中心，后在美国和欧洲进行博士后研究，研究方向为城市生态及环境遥感，主要包括，城市化进程中的土地利用变化监测，城市景观格局量化及其环境效应。

ACADEMIC SALON (XVII)

SPEAKER: Jingli Yan

Postdoctoral,  Catholic University of Leuven

TIME ：12:40-14:00  Jun 2^nd, 2021

VENUE：Room 104, Building B, SAB

ORGANIZER：Office of Discipline and Science & Technology, SAB;

Young Teachers Association, SAB

TITLE：Remote sensing monitoring of green spaces in urban human settlements

ABSTRACT：

The greenspace in urban settlements provides city citizens with immediate access to greenness and numerous ecosystem services, as urban residential greenspace comprise more than half of overall greenspace in many cities. Their small patch size and high biodiversity, however, bring more challenges for low- and moderate-resolution satellite imagery to accurate greenspace mapping, which could help authorities better manage greenspace to support human well-being.

Here we conducted residential greenspace recognitions at two different scenarios and scales. Firstly we recognized greenspace types in urban settlements of Leuven city, Belgium using multi-temporally stereoscopic Pleiades satellite imagery. We found that the mean green coverage of urban gardens was 62.37% (mean green size was 366m2) across study area of Leuven city. The overall accuracy achieved by multi-temporal imagery was nearly 9.47%, tri-stereo imagery for 12.79%, and was up to 20.16% when applying them together. Then we quantified the residential greenspace dynamics from 1995 to 2010 across European human settlements. From the continental analysis, we concluded that the moderate resolution satellite imagery dramatically underestimated the greenspace growth in European human settlements. The residential greenspace per capita was divergent among European countries. Most southern Europe settlements exhibit the degradation of residential greenspace while eastern Europe was almost the opposite. Developing high-vegetated new settlements has been the primary way to increase their urban greenness level for most European countries. This study calls for greater attention to urban residential greenspace and more multidisciplinary studies conducted in collaboration of local authorities and urban ecologists to provide both greenspace density and landscape amenities in urban human settlements.