The city of New Orleans is still recovering from Hurricane Katrina and continues to experience numerous negative effects from the lingering storm damage to its urban forest cover. The goal of this study was to analyze recent changes in area coverage of all trees, shrubs, and herbaceous lawns in neighborhoods of New Orleans, particularly in three of the most severely areas damaged by the flooding of 2005, down to the scale of individual blocks, and on all demolished lots and properties conveyed new ownership since 2010. Object-based classification for 4-band aircraft imagery from the National Agriculture Imagery Program (NAIP) was used to generate high-resolution maps of large tree canopy cover and vacant lots for the city of New Orleans. Field surveys and online map street photos were used to determine the accuracy of new city-wide maps of large tree canopy area. Based on 2017 NAIP image analysis of Katrina-flooded areas, results showed that the Lakeview neighborhood had the greatest number of large trees and the highest density of tree canopy area (at 11% cover), compared to the Lower Ninth Ward and Seventh Ward neighborhoods (both at 9% cover). However, vacant lots mapped in the Lower Ninth Ward were (on average) over twice as large in area as the vacant lot polygons in the other two neighborhoods studied. It was further estimated that 70% of the total area in the Lower Ninth Ward remains covered by vacant lots with shrub and herbaceous cover. The absolute number of lots was also highest for the Lower Ninth Ward with respect to demolished properties with a continuing net greening trend between 2010 and 2017. It is concluded that an object-based classification method can generate accurate high-resolution maps of large tree canopy cover and vacant vegetated lots for the city of New Orleans.

新奥尔良市仍在从卡特里娜飓风中恢复过来，并继续遭受持续的风暴破坏其城市森林覆盖的众多负面影响。这项研究的目的是分析新奥尔良附近地区所有树木，灌木和草本草坪的区域覆盖率最近的变化，尤其是在2005年洪水造成的最严重的三个区域中，直至单个街区的规模，并且自2010年以来，所有被拆毁的地段和财产都转移了新所有权。国家农业影像计划（NAIP）对4波段飞机影像进行了基于对象的分类，从而生成了大树冠覆盖和空地的高分辨率地图。新奥尔良市。现场调查和在线地图街道照片被用来确定新的全市大树冠区域地图的准确性。根据2017年卡特里娜飓风灾区的NAIP图像分析，结果表明，与下第九区和第七区相比，湖景区的大树数量最多，树冠面积最高（覆盖率为11％） （覆盖率均为9％）。但是，下第九区中的空地面积（平均）比其他两个街区中的空地多边形大两倍。进一步估计，下第九区总面积的70％仍被灌木和草本覆盖的空地所覆盖。