Probability Estimation of Change Maps Using Spectral Similarity

Abstract

Change Detection (CD), which is a process of identifying changes that have occurred in a geographical area over the time, plays a key role in many applications, including assessing natural disasters, monitoring crops, and managing water resources. In the past decades, many CD techniques have been proposed. Hence, evaluating and analyzing of the probability of changes and interpreting them is an essential task which leads to better management of natural resources and the prevention of disasters. For this purpose, we adopted an approach to estimate the probability of changes that have occurred in the image scene. Based on this approach, changed pixels are categorized and labeled as probabilities (in percentage format). In this paper, the proposed framework consists of the following four steps. Firstly, this research produces a final binary change map (BCM) through combining the results of some of popular binary CD methods that have been proposed in the literature. Then an unmixing process is adopted and in the next step the spectral similarity of pixels is calculated in the abundance maps of endmembers. A measurement of spectral similarity identifies the finer spectral differences between the two hyperspectral images (HSIs). Finally, spectral similarity values are masked by the final BCM resulting in a probability map of changes. The experimental results verified that the method is able to obtain good results and may be well suited for hyperspectral CD applications.

Assessing and Comparing the Performance of Endmember Extraction Methods in Multiple Change Detection Using Hyperspectral Data

“…Due to environmental and equipment conditions, data preprocessing plays a crucial role in remote sensing before the beginning of the main process. The pre-processing is made in two steps: (1) geometric pre-processing and (2) spectral preprocessing (including remove no-data bands, de-striping, noise reduction, smile-frown detection, radiometric calibration, and atmospheric correction) (Ertürk et al, 2015;Hasanlou et al, 2018;Jafarzadeh et al, 2019).…”

“…The availability of images acquired on the same geographical area by satellite sensors at different times makes it possible to identify and label possible changes that have occurred on the ground (Bovolo et al, 2007). Change detection (CD) is one of the most important uses of remote sensing, and it plays a key role in many applications (Jafarzadeh et al, 2019;Liu et al, 2015). The results of the CD are generally available in two forms: (1) a binary change map (i.e., the separation of change or no-change pixels), or (2) a multiple change map (i.e., the detection of different kinds of change) (Hasanlou et al, 2018).…”