{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,3]],"date-time":"2026-03-03T03:20:04Z","timestamp":1772508004639,"version":"3.50.1"},"reference-count":79,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2022,8,7]],"date-time":"2022-08-07T00:00:00Z","timestamp":1659830400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Operational Program Competitiveness 2014\u20132020, Axis 1","award":["POC\/448\/1\/1"],"award-info":[{"award-number":["POC\/448\/1\/1"]}]},{"name":"Operational Program Competitiveness 2014\u20132020, Axis 1","award":["127324"],"award-info":[{"award-number":["127324"]}]},{"name":"Research Centre with Integrated Techniques for Atmospheric Aerosol Investigation in Romania (RECENT AIR) project","award":["POC\/448\/1\/1"],"award-info":[{"award-number":["POC\/448\/1\/1"]}]},{"name":"Research Centre with Integrated Techniques for Atmospheric Aerosol Investigation in Romania (RECENT AIR) project","award":["127324"],"award-info":[{"award-number":["127324"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The expansion of bare sand surfaces indicates a tendency towards desertfication in certain periods as a result of the improper agricultural use of sand soils and of the significant changes in the climate in the past 30 years. The Normalised Sand Index (NSI) is a new index used to identify bare sand areas and their spatio-temporal evolution in SW Romania. Landsat scenes (1988, 2001, 2019), spectral and soil texture analysis (36 samples), covariates (e.g., soil map), and field observations allowed for the validation of the results. The performance of the NSI was compared with indices from the sand index family (e.g., Normalized Differential Sand Areas Index) and supervised classifications (e.g., Maximum Likelihood Classification) based on 47 random control square areas for which the soil texture is known. A statistical analysis of the NSI showed 23.6% (27,310.14 hectares) of bare sands in 1988, followed by an accelerated increase to 47.2% (54,737.73 hectares) in 2001 because of economic and land-use changes, and a lower increase by 2019, which reached 52.5% (60,852.42 hectares) due to reforestation programs. Compared to the NSI, the bare sand areas obtained with the tested indicator were almost 20% higher. The traditional classification shows smaller areas of bare sands but uses a higher complexity of land use classes, while the producer accuracy values are lower than those of the NSI. The new index has achieved a correct spatial delimitation of soils in the interdune-dune and major riverbed-interfluvial areas, but it is limited to the transition Arenosols-Chernozems by humus content and agrotechnical works. The new spectral index favours bare sand monitoring and is a fast and inexpensive method of observing the desertification trend of temperate sandy agroecosystems in the context of climate change.<\/jats:p>","DOI":"10.3390\/rs14153802","type":"journal-article","created":{"date-parts":[[2022,8,9]],"date-time":"2022-08-09T04:16:55Z","timestamp":1660018615000},"page":"3802","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Normalized Sand Index for Identification of Bare Sand Areas in Temperate Climates Using Landsat Images, Application to the South of Romania"],"prefix":"10.3390","volume":"14","author":[{"given":"Cristian Vasilic\u0103","family":"Secu","sequence":"first","affiliation":[{"name":"Department of Geography, Faculty of Geography and Geology, University \u201cAlexandru Ioan Cuza\u201d, 700505 Iassy, Romania"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8852-2724","authenticated-orcid":false,"given":"Cristian Constantin","family":"Stoleriu","sequence":"additional","affiliation":[{"name":"Department of Geography, Faculty of Geography and Geology, University \u201cAlexandru Ioan Cuza\u201d, 700505 Iassy, Romania"}]},{"given":"Cristian Dan","family":"Lesenciuc","sequence":"additional","affiliation":[{"name":"Department of Geography, Faculty of Geography and Geology, University \u201cAlexandru Ioan Cuza\u201d, 700505 Iassy, Romania"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0144-8141","authenticated-orcid":false,"given":"Adrian","family":"Ursu","sequence":"additional","affiliation":[{"name":"Department of Geography, Faculty of Geography and Geology, University \u201cAlexandru Ioan Cuza\u201d, 700505 Iassy, Romania"}]}],"member":"1968","published-online":{"date-parts":[[2022,8,7]]},"reference":[{"key":"ref_1","unstructured":"(2022, April 10). 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