Soil Salinity Mapping Using Remote Sensing and GIS

Q3 Social Sciences

Geomatica Pub Date : 2022-11-01 DOI:10.1139/geomat-2021-0015

M. Gad, Mostafa A. Mohamed, M. Mohamed

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引用次数: 1

Abstract

Monitoring of Soil salinity plays a vital role in the agricultural society. Soil salinity causes land degradation processes, especially in arid and semi-arid regions which influence soil properties, reduce yield production of crops, and affect infrastructure. This research produces soil salinity mapping of East Delta in Egypt in 1995 using remote sensing technology. Landsat 5 image taken on September 26, 1995, was used. Radiometric and atmospheric corrections for satellite data were applied. Different salinity indices (SI) were used such as Normalized Difference Salinity Index (NDSI), SI1, SI2, SI3, SI4, SI5, SI6, and SI7 beside Normalized Difference Vegetation Index (NDVI) which was used for data filtration. The field’s Electrical Conductivity (EC) was measured during the period from 22 to 26 September 1995 by the Japanese International Cooperation Agency (JICA). This data was used as ground truth for the correlation analysis with different indices image bands values. SLR (Simple linear regression) and Mean RE (Relative error) were used to find the best index which was SI5 with a 0.87 correlation with field truth data and mean RE equal 22.7% This index was used to produce a salinity map of the Eastern Delta with acceptable accuracy. Finally, it is concluded that using remote sensing in salinity detection and mapping is highly appreciated.

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利用遥感和GIS绘制土壤盐度图

土壤盐分监测在农业社会中起着至关重要的作用。土壤盐碱化导致土地退化过程，特别是在干旱和半干旱地区，从而影响土壤性质，降低作物产量，并影响基础设施。本研究利用遥感技术绘制了1995年埃及东三角洲地区的土壤盐度图。使用的是1995年9月26日拍摄的陆地卫星5号图像。应用了卫星数据的辐射和大气校正。除采用归一化植被指数(NDVI)进行数据过滤外，采用归一化差异盐度指数(NDSI)、SI1、SI2、SI3、SI4、SI5、SI6和SI7等不同盐度指数(SI)。日本国际协力事业团在1995年9月22日至26日期间测量了该油田的电导率。该数据作为与不同指标图像波段值的相关性分析的基础真值。利用SLR (Simple linear regression，简单线性回归)和Mean RE (Relative error，相对误差)得到最佳指数SI5，与现场真实值的相关系数为0.87，平均RE为22.7%，利用该指数绘制出了精度可接受的东三角洲盐度图。最后，提出了利用遥感技术进行盐度探测与制图的建议。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geomatica Social Sciences-Geography, Planning and Development

CiteScore

1.50

自引率

0.00%

发文量

期刊介绍： Geomatica (formerly CISM Journal ACSGC), is the official quarterly publication of the Canadian Institute of Geomatics. It is the oldest surveying and mapping publication in Canada and was first published in 1922 as the Journal of the Dominion Land Surveyors’ Association. Geomatica is dedicated to the dissemination of information on technical advances in the geomatics sciences. The internationally respected publication contains special features, notices of conferences, calendar of event, articles on personalities, review of current books, industry news and new products, all of which keep the publication lively and informative.