Back to Search
Start Over
A CHANGE VECTOR ANALYSIS METHOD TO MONITOR DROUGHT USING LANDSAT DATA
- Source :
- The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XLII-4-W18, Pp 321-325 (2019)
- Publication Year :
- 2019
- Publisher :
- Copernicus Publications, 2019.
-
Abstract
- Drought has always been a heavy financial burden on a country's economy. To mitigate the impacts of an ongoing drought, spatial information on high risk areas are required. Therefore, the aim of this study is to identify the areas prone to drought in order to minimize the damages through a proper management policy. To achieve this goal, the actual evapotranspiration is considered. The rate of actual evapotranspiration was measured in Najaf Abad using the Surface Energy Balance Algorithm for Land (SEBAL) on Landsat ATM+ images. To present and test the changes in drought, the Change Vector Analysis (CVA) technique was applied to multi-temporal data to compare the differences in the time-trajectory of the tasselled cap intestines and brightness for two time periods 1995 to 2008 – 2008 to 2015. The images were processed using ArcGIS 10.3 and ERDAS Imagine 8.6™ software. The results indicated that the changed area is 9691.41 hectare and the unchanged is 49335.2 hectare between 1995 to 2008. The area of the changed pixels between 2008 and 2015, 3% is higher than the area of the change pixels in 1995 until 2008. In more than 3-quarter of the study area, the value of evapotranspiration has not changed. The proposed method demonstrated immense potentials in monitoring drought change dynamics especially when complemented with field studies.
- Subjects :
- lcsh:Applied optics. Photonics
SEBAL
010504 meteorology & atmospheric sciences
Pixel
lcsh:T
0211 other engineering and technologies
lcsh:TA1501-1820
Change vector analysis
02 engineering and technology
01 natural sciences
lcsh:Technology
Surface energy balance
lcsh:TA1-2040
Evapotranspiration
Environmental science
lcsh:Engineering (General). Civil engineering (General)
Hectare
Spatial analysis
021101 geological & geomatics engineering
0105 earth and related environmental sciences
Remote sensing
Subjects
Details
- Language :
- English
- ISSN :
- 21949034 and 16821750
- Database :
- OpenAIRE
- Journal :
- The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
- Accession number :
- edsair.doi.dedup.....9889febfe0b7afa0d9be120dbb8cda27