Agricultural Crop Detection from Multi-Temporal Sentinel 2 Images: A Case Study of Mardin - Kızıltepe

Yıl 2021, , 881 - 899, 31.08.2021

Müslüm Altun , Mustafa Türker

https://doi.org/10.35414/akufemubid.890436

Cited By: 3

Öz

In this study, crop detection was carried out in an agricultural region in the Artuklu, Kızıltepe and Derik districts of the city of Mardin through classification of multi-temporal Sentinel-2 images from 2018. In the classification, the Random Forest (RF) algorithm was used through a parcel-based approach. The detected crops are corn, wheat, cotton, chickpeas, lentils and the others. The images acquired on six different dates (April 8, May 23, July 12, August 11, September 5 and October 5) were selected as the images. In the classification, the 10m spatial resolution bands Blue (B), Green (G), Red (R) and Near Infrared (NIR) were used. Furthermore, for each image date a Normalized Difference Vegetation Index (NDVI) band was computed and used as additional band in classification. The classification process through the RF algorithm was carried out using the stack of 30 bands that includes five bands (B, G, R, NIR, NDVI) for each image. For training samples and the accuracy assessment of the results, the existing Farmers’ Registry System (FRS) was utilised. As a result of the classification process, the overall accuracy of 96.35% and the Kappa value of 93.13% were achieved.

Anahtar Kelimeler

Sentinel 2, Machine Learning Algorithm, Random Forest (RF) Classification Technique, Farm Registration System (FRS)

Çoklu Zamanlı Sentinel-2 Görüntülerinden Tarımsal Ürün Tespiti: Mardin – Kızıltepe Örneği

Öz

Bu çalışmada, Mardin İli, Artuklu, Kızıltepe ve Derik İlçelerinde tarımsal arazilerden oluşan bir bölgede, 2018 yılına ait çoklu tarihli Sentinel-2 uydu görüntülerinden sınıflandırma yöntemi ile ürün tespiti yapılmıştır. Sınıflandırmada, Rastgele Orman (RO) algoritması parsel-tabanlı yaklaşımla kullanılmıştır. Tespit edilen ürünler mısır, buğday, pamuk, nohut, mercimek ve diğerleridir. Görüntü olarak altı farklı tarihte (8 Nisan, 23 Mayıs, 12 Temmuz, 11 Ağustos, 5 Eylül ve 5 Ekim) çekilmiş görüntüler seçilmiştir. Sınıflandırmada 10m konumsal çözünürlüklü Mavi (M), Yeşil (Y), Kırmızı (K) ve Yakın Kızıl Ötesi (YKÖ) bantlar kullanılmıştır. Ayrıca, her bir görüntü tarihi için Normalize Edilmiş Fark Bitki Örtüsü İndeksi (NFBİ) bandı hesaplanmış ve sınıflandırmada ek bant olarak kullanılmıştır. RO algoritması ile sınıflandırma işlemi, her bir görüntü tarihine ait beş bant (M, Y, K, YKÖ ve NFBİ) olmak üzere, toplam 30 bantlı görüntü yığınının tek seferde sınıflandırmaya dâhil edilmesi şeklinde gerçekleştirilmiştir. Eğitim alanı örnekleri ve sonuçların doğruluk analizleri için, mevcut Çiftçi Kayıt Sistemi (ÇKS) verilerinden yararlanılmıştır. Sınıflandırma neticesinde % 96.35 genel doğruluk ve % 93.13 kappa katsayısı değerlerine ulaşılmıştır.

Anahtar Kelimeler

Sentinel 2, Makine Öğrenme Algoritması, Rastgele Orman (RO) Sınıflandırma Tekniği, Çiftçi Kayıt Sistemi (ÇKS)

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