Vegetation Cover Changes in Neighborhoods of New Orleans Following Catastrophic Flooding from Hurricane Katrina
Tóm tắt
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.
Tài liệu tham khảo
Algu, P. R., 2015, A study of resiliency in New Orleans neighborhoods ten years after Hurricane Katrina, Louisiana State University Master’s Thesis 3069. Available online at https://digitalcommons.lsu.edu/gradschool_theses/3069
Brinkley, D. (2006). The great deluge: Hurricane Katrina, New Orleans, and the Mississippi Gulf Coast. New York: Harper Collins.
Campanella, R., & Rose, C. (2016). 14 to 1: Post-Katrina architecture by the numbers. Places. https://doi.org/10.22269/160712.
Chakraborty, J., Collins, T., & Grineski, S. (2019). Exploring the environmental justice implications of hurricane Harvey flooding in greater Houston, Texas. American Journal of Public Health, 109, 244–250.
Cutter, S., Ash, K., & Emrich, C. (2014). The geographies of community disaster resilience. Global Environmental Change, 29, 65–77.
Federal Emergency Management Agency (FEMA). 2006. Chapter 8. Overview of hurricane Katrina in the New Orleans area, FEMA 549, Hurricane Katrina in the Gulf Coast: Mitigation Assessment Team Report.
Gaertner, J., Genovese, V., Potter, C., Sewake, K., & Manoukis, N. C. (2017). Vegetation classification of coffee on Hawai’i Island using Worldview-2 satellite imagery. Journal of Applied Remote Sensing, 11(4). https://doi.org/10.1117/1.JRS.11.046005.
Gesch, D. (2007). Topography-based analysis of hurricane Katrina inundation of New Orleans (4 pp). Sioux Falls: U.S. Geological Survey Center for Earth Resources Observation and Science.
Hatcher, L., Strother, L., Burnside, R., & Hughes, D. (2012). The USACE and post-Katrina new Orleans: Demolitions and disaster clean-up. Journal of Applied Social Science, 6(2), 176–190.
Kondo, M. C., Morrison, C., Jacoby, S. F., Elliott, L., Poche, A., Theall, K. P., & Branas, C. C. (2018). Blight abatement of vacant land and crime in New Orleans. Public Health Reports, 133, 650–657.
Lewis, J., Zipperer, W., Ernstson, H., Bernik, B., Hazen, R., Elmquist, T., & Blum, M. (2017). Socioecological disparities in New Orleans following hurricane Katrina. Ecosphere, 8(9), e01922.
Opitz, D., & Blundell, S. (2008). Object recognition and image segmentation: The feature analyst approach. In T. Blaschke, S. Lang, & G. J. Hay (Eds.), Object based image analysis (pp. 153–168). Berlin: Springer-Verlag.
Rivlin, G. (2015). Katrina: After the flood. New York: Simon and Schuster.
Schwarz, K., Fragkias, M., Boone, C., Zhou, W., McHale, M., Grove, J., O’Neil-Dunne, J., McFadden, J., Buckley, G., Childers, D., Ogden, L., Pincetl, S., Pataki, D., Whitmer, A., & Cadenasso, M. (2015). Trees grow on money: Urban tree canopy cover an environmental justice. PLoS One, 10(4), e0122051.
Schwarz, K., Berland, A., & Herrmannc, D. (2018). Green, but not just? Rethinking environmental justice indicators in shrinking cities, Sustainable Cities and Society, 41, 816–821.
Seicshnaydre, S., & Collins, R. A. (2018). Rigging the real estate market: Segregation, inequality, and disaster risk, in the New Orleans prosperity index: Tricentennial collection (18 pp). New Orleans: The Data Center.