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Toprak neminin yarı kurak alanlarda çok zamanlı RADARSAT-2 verileri ile incelenmesi
2022
Journal:  
Jeodezi ve Jeoinformasyon Dergisi
Author:  
Abstract:

Toprak nemi içeriği yeryüzünde enerji değişimi ve su döngüsü açısından çok önemli bir faktördür ve doğal risklerin değerlendirilmesi, hidroloji, ekoloji, tarım ve iklim bilimi gibi pek çok alanda büyük etkiye sahiptir. Toprak nemi özellikle arazi kullanımlarında konumsal ve zamansal olarak çok fazla değişerek çeşitli çevresel ve ekolojik sorunlara yol açabilmektedir. Bu nedenlerden dolayı, toprak nem içeriğinin konumsal değişiminin geniş ölçeklerde incelenmesi önemli bir araştırma konusudur. Sentetik Açıklıklı Radar (SAR) algılayıcıları toprak nemine duyarlı oldukları ve geniş alanları kapsadıkları için toprak neminin tespit edilmesinde önemli rol oynamaktadır. Bu çalışmada, Tarım İşletmeleri Genel Müdürlüğü Gözlü Tarım İşletmesi’nde seçilen buğday ekili ve nadasa bırakılmış tarlaların toprak nem içeriğinin konumsal ve zamansal değişiminin tam polarimetrik RADARSAT-2 görüntüleri ile belirlenebilirliğinin araştırılması amaçlanmıştır. 2016 yılı Mart ve Ekim ayları arasında yapılan aylık arazi ölçümlerinden elde edilen yersel ölçüm değerleri SAR gerisaçılım değerleri ile karşılaştırılmıştır. Çalışma sonucunda, doğrudan geri saçılım ile nem değerleri arasında -0.65 ile 0.67 arasında değişen negatif ve pozitif korelasyon katsayıları elde edilmiştir. Toprak nemi için ekili alanda buğdayın büyüme evresi olan Mayıs-Haziran döneminde daha yüksek korelasyon belirlenmiş olup, her iki alan için en iyi sonuç VV polarimetrik verisi ile elde edilmiştir.

Keywords:

Study of soil moisture in semi-dry areas with multiple RADARSAT-2 data
2022
Author:  
Abstract:

The soil moisture content is a very important factor in terms of energy change and water cycle on Earth, and the assessment of natural risks has a great impact in many areas such as hydrology, ecology, agriculture and climate science. Soil moisture can lead to a variety of environmental and ecological problems, especially in the use of soil, by changing locally and temporarily. For these reasons, the study of the local change of soil moisture content on a wide scale is an important research topic. The synthetic open radar (SAR) detectors play an important role in the detection of soil moisture because they are sensitive to soil moisture and cover large areas. In this study, the aim of the General Directorate of Agricultural Enterprises is to investigate the determinability of the local and temporary change of the soil moisture content of grain plants and nuts left selected in the Eye Agricultural Enterprise with full polar-metric images of RADARSAT-2. The local measurement values obtained from the monthly land measurements made between March and October 2016 were compared with the SAR reversal values. The study resulted in negative and positive correlation rates ranging from -0.65 to 0.67 between direct back hair and moisture values. Higher correlation has been determined in the May-June period, which is the grain’s growth stage in the planted area for soil moisture, and the best result for both areas has been obtained with VV polarimetric data.

Keywords:

Analysis Of Soil Moisture In Semi-arid Areas With Multi-temporal Radarsat-2 Data
2022
Author:  
Abstract:

Soil moisture content is a very important factor in terms of energy exchange and water cycle on Earth and has a great impact in many areas regarding assessment of natural risks, hydrology, ecology, agriculture, and climate science. Soil moisture can greatly change spatially and temporally, especially depending on land use changes, and the changing soil moisture may cause various environmental and ecological problems. In this respect, it is an important research subject to examine the spatial change of soil moisture content on large scales. Synthetic Aperture Radar (SAR) sensors play an important role in detecting soil moisture because they are sensitive to soil moisture and they cover large areas. In this study, it was aimed to investigate the determination of the spatial and temporal variation of soil moisture content using fully polarimetric RADARSAT-2 images in wheat cultivated field and fallow land located in The General Directorate of Agricultural Enterprises Gözlü Agricultural Enterprise. The in-situ measurements obtained monthly from field surveys between March and October 2016 were compared with the backscatter values of SAR images. As a result of the study, negative and positive correlation coefficients varying from -0.65 to 0.67 were obtained between backscatter values and in-situ soil moisture values. The highest correlations for soil moisture were obtained in the cultivated area during the May-June period, which is the growing stage of wheat, and the best results for both areas were determined with VV polarimetric data.

Keywords:

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Jeodezi ve Jeoinformasyon Dergisi

Field :   Mühendislik

Journal Type :   Ulusal

Metrics
Article : 62
Cite : 105
2023 Impact : 0.167
Jeodezi ve Jeoinformasyon Dergisi