Journals / Biotech Studies / 2014 / Cilt: 23 Sayı: 1

Assessment of Rangeland Vegetation Condition from Time Series NDVI Data

Mera Vejetasyonu Durumunun Zaman Serisi NDVI Verileri ile Belirlenmesi

Pages
14–22
Publication Date
2014-07-23
DOI
—
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

General classification accuracy and Kappa statistic values were 52.5% and 0.30 respectively.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:The great spatial extent of rangelands has prompted a need for more efficient and cost effective management tools.
📊
Key Findings & Data:A supervised classification algorithm was used to obtain four rangeland conditions called “very good”, “good”, “moderate” and “poor”.
💡
Conclusion & Impact:General classification accuracy and Kappa statistic values were 52.5% and 0.30 respectively.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Sınıflama · rakım · NDVI

Abstract

The great spatial extent of rangelands has prompted a need for more efficient and cost effective management tools. Satellite based normalized difference vegetation index (NDVI) data offers improved and timely monitoring of rangeland vegetation. Since elevation is one of the factors affecting vegetation phenology, it should be considered when assessing vegetation status of rangelands. In this study, rangeland condition was determined by classifying an elevation-normalized NDVI image (EN-NDVI) produced by a conditional rule approach based on elevation data representing active growing season of rangelands in whole project area. A supervised classification algorithm was used to obtain four rangeland conditions called “very good”, “good”, “moderate” and “poor”. The results revealed that the coverage of each range condition was; 10.02% “very good”, 20.55% “good”, 31.83% “moderate” and 37.60% “poor”. General classification accuracy and Kappa statistic values were 52.5% and 0.30 respectively.

Özet

Geniş alanları kapsayan meraların daha etkin ve ekonomik yönetimi için yeni yöntemlerin geliştirilmesine gereksinim duyulmaktadır.Uydu verilerinden elde edilen normalleştirilmiş fark bitki indeksi (NDVI) verisi mera vejetasyonunun zamana bağlı olarak izlenmesine olanak verir. Yükselti vejetasyon gelişimini etkileyen önemli faktörlerden birisi olduğundan meraların vejetasyon durumunu belirlerken rakımın dikkate alınması gereklidir. Bu amaçla; çalışma alanındaki benzer yükseltiye sahip mera alanlarını temsil eden 10 yıllık (2000-2009) ortalama NDVI verisinden şartlı kural yöntemiyle yükseltiye göre normalleştirilmiş EN-NDVI verisi üretilmiştir. Daha sonra, EN-NDVI verisine kontrollü sınıflandırma yöntemi uygulanarak çalışma alanına ait dört farklı mera durum sınıfı elde edilmiştir. Bu sınıflar; “çok iyi”, “iyi”, “orta” ve “zayıf” olarak adlandırılmıştır. Sonuçlar, her bir mera durumu için kaplama alanının; “çok iyi” %10,02, “iyi” % 20,55, “orta” % 31,83 ve “zayıf” %37,60 şeklinde olduğunu göstermiştir. Yapılan değerlendirmede genel doğruluk %52,5 ve Kappa istatistiği 0,30 olarak bulunmuştur.

🔖

Cite This Article

ÜNAL, E., MERMER, A., YILDIZ, H. (2014). Assessment of Rangeland Vegetation Condition from Time Series NDVI Data. Biotech Studies, Cilt: 23 Sayı: 1, 14–22. https://ajindex.com/articles/892696

📄 Full Text PDF Viewer

📄

PDF görüntüleyici hazırlanıyor...

References (7)

  1. Alesheikh A.A., Fard FSN., 2007. Design and implementation of a knowledge based system to improve maximum likelihood classification accuracy. Canadian Journal of Remote Sensing, 33: 459-467
  2. Avağ A., Simsek U., Uzun M., 2012. Database activities of national grassland management project. Tarım Bilimleri Dergisi. 5: 102-106 Congalton R.E.G., 1991. A review of assessing the accuracy of classification of remotely sensed data. Remote Sensing of Environment, 37: 35-36
  3. Çomaklı B., Fayetörtbay D., Daşcı M., 2012. Changing of botanical composition and canopy Coverage Ratio in Rangelands at Different Altitudes. Journal of Agriculture Faculty of Atatürk University., 43: 17-21 Dyksterhuis E.J., 1949. Condition and management of range land based on quantitative ecology. Journal of Range Management, 2: 104-115
  4. Dymond J.R., Stephens P.R., Newsome P.F., Wilde R.H., 1992. Percentage vegetation cover of a degrading rangeland from SPOT. International Journal of Remote Sensing, 13: 1999–2007 ESRI 1998. ESRI Shapefile Technical Description. An ESRI White Paper—July 1998 Fırıncıoglu H.K., 2004. An assessment of the pasture and forage production of Turkey. Tarla Bitkileri Merkez Araştırma Enstitüsü Dergisi, 13: 1-28 Frost W.E., and Smith E.L., 1991. Biomass productivity and range condition on range sites in southern Arizona. J. Range Manage. 44:64-67 Friedl M.H., 1991. Range condition assessment and the concept of thresholds: A viewpoint. Journal of Range Management, 44: 422-426
  5. Friedl M.A., Michaelsenn J., Dawis F.W., Walker H. and Schimel D.S., 1994. Estimating grassland biomass and leaf area index using ground and satellite data. International Journal of Remote Sensing, 15: 1401-1420 Foody G.M., 2002. Status of land cover classification accuracy assessment. Remote Sensing of Environment, 80: 185-201
  6. Geerken R., Zaitchik B., Evans J.P., 2005. Classifying rangeland vegetation type and coverage from NDVI time series using Fourier Filtered Cycle Similarity. International Journal of Remote Sensing. Vol. 26, No. 24, 5535–5554 Gitelson A., 2004. Wide dynamic range vegetation index for remote quantification of biophysical characteristics of vegetation. Journal of Plant Physiology 161: 165-173 Holben B.N., 1986. Characteristics of maximum-value composite images from temporal AVHRR data. International Journal of Remote Sensing, 7: 1417-1434
  7. Javzandulam T., Tateishi T., Sanjaa T., 2005. Analysis of vegetation indices for monitoring vegetation degradation in semi-arid and arid areas of Mo