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Object-based cropland degradation identification: a case study in Uzbekistan

Dubovyk, Olena and Menz, Gunther and Conrad, Christopher and Khamzina, Asia and Dech, Stefan (2012) Object-based cropland degradation identification: a case study in Uzbekistan. In: Proceedings of SPIE, 8538. SPIE. SPIE Remote Sensing, 24-27 Sep 2012, Edinburgh. ISBN 9780819492784

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Official URL: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1387495

Abstract

Sustainability of irrigated agriculture-based economies, such as in Central Asia, is threatened by cropland degradation. The field-based identification of the degraded agricultural areas can aid in developing appropriate land rehabilitation and monitoring programs. This paper combined the object-based change detection and spectral mixture analysis to develop an approach for identifying parcels of irrigated degraded cropland in Northern Uzbekistan, Central Asia. A linear spectral unmixing, followed by the object-based change vector analysis, was applied to the multiple Landsat TM images, acquired in 1987 and 2009. Considering a spectral dimensionality of Landsat TM, a multiple 4-endmember model (green vegetation, water, dark soil, and bright soil) was set up for the analysis. The spectral unmixing results were valid, as indicated by the overall root mean square errors of <2.5% reflectance for all images. The results of change detection revealed that about 33% (84,540 ha) of cropland in the study area were affected by the degradation processes to varying degrees. Spatial distribution of degraded fields was mainly associated with the abandoned fields and lands with inherently low fertile soils. The proposed approach could be elaborated for a field-based monitoring of cropland degradation in similar landscapes of Central Asia and elsewhere.

Item URL in elib:https://elib.dlr.de/79205/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Object-based cropland degradation identification: a case study in Uzbekistan
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dubovyk, OlenaUNSPECIFIEDUNSPECIFIED
Menz, GuntherUNSPECIFIEDUNSPECIFIED
Conrad, Christopherchristopher.conrad (at) uni-wuerzburg.deUNSPECIFIED
Khamzina, AsiaUNSPECIFIEDUNSPECIFIED
Dech, Stefanstefan.dech (at) dlr.deUNSPECIFIED
Date:2012
Journal or Publication Title:Proceedings of SPIE
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:8538
Editors:
EditorsEmail
Habib, ShahidUNSPECIFIED
Michel, UlrichUNSPECIFIED
Civco, DanielUNSPECIFIED
Messinger, DavidUNSPECIFIED
Maltese, AntonioUNSPECIFIED
Publisher:SPIE
Series Name:Earth Resources and Environmental Remote Sensing/GIS Applications III
ISBN:9780819492784
Status:Published
Keywords:Agriculture, Reflectivity, Water
Event Title:SPIE Remote Sensing
Event Location:Edinburgh
Event Type:international Conference
Event Dates:24-27 Sep 2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Geowissenschaftl. Fernerkundungs- und GIS-Verfahren
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center
Deposited By: Kübert, Carina
Deposited On:14 Feb 2013 10:49
Last Modified:18 Mar 2013 16:56

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