Spatiotemporal Image Fusion in Remote Sensing
Abstract
:1. Introduction
2. Fusion Methods to Increase Spatiotemporal Resolution of Satellite Images
2.1. Reconstruction-Based Spatiotemporal Image Fusion Methods
2.2. Learning-Based Spatiotemporal Image Fusion Methods
2.3. Unmixing-Based Spatiotemporal Image Fusion Methods
3. Synthesis: Challenges and Opportunities
3.1. Other Advanced Methods for Spatiotemporal Image Fusion
3.2. Increasing the Resolution of Various Satellite-Derived Data Products
3.3. Methods to Increase Spatiotemporal-Spectral Resolution of Images
3.4. Quality Assessment of Spatiotemporal Blended Images
3.5. Spatiotemporal Image Fusion Methods for Sentinel Images
3.6. Important Data Pre-processing Issues to be Considered when Fusing Spatiotemporal Images
- Spectral responses of input images have to be unified: Reconstruction and unmixing spatiotemporal image fusion methods assume that input images have similar spectral information. Therefore, their application is limited, given that the sensors might have different wavelength. When blending information from different remote sensing data sources, we have to spectrally normalize the input sensors to common wavebands [70]. According to Pinty et al. [127], the absence of similar wavelength has a low impact on the fusion results when physically-based reflectance methods are used for blending surface reflectance of the input images. Machine learning based spatiotemporal image fusion methods, on the other hand, are less sensitive to similarity between spectral responses of the input images.
- Co-registration of multi-source input images: Multi-source images alignment is a very important issue to be considered when fusing them. For example, reported misalignments between Landsat and Sentinel-2 by several pixels need to be carefully addressed when fusing the two input images [125]. Further investigation in the development of automatic solutions for images alignments is highly required [70].
- Atmospheric corrections: Radiometric consistency of the multi-source images to be fused might vary because of the presence of clouds and haze, or because of the differences in the illumination and acquisition angles [88]. Therefore, input images have to be radiometrically corrected before fusing them [70] using one of the available existing radiometric corrections techniques such as MODerate spectral resolution TRANsmittance code (MODTRAN) [128]. These techniques can be grouped into two categories, namely absolute and relative techniques. Absolute techniques require information on the sensor spectral profile for sensor calibration and corrections of images for atmospheric effects [129]. Relative radiometric techniques involve either the selection of landscape elements whose reflectance remain constant over time [130,131] or normalization using regression [132,133].
3.7. Future Directions
4. Conclusions
Author Contributions
Conflicts of Interest
References
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Spatiotemporal Fusion Model | Categories | |
---|---|---|
Gao et al. [32] | Spatial and Temporal Adaptive Reflectance Fusion Model (STARFM) | Reconstruction-based |
Hilker et al. [43] | Spatial-Temporal Adaptive Algorithm for mapping Reflectance Change (STAARCH) | Reconstruction-based |
Zhu et al. [44] | Enhanced spatial and temporal adaptive reflectance fusion model (ESTARFM) | Reconstruction-based |
Hazaymeh and Hassan [45] | Spatiotemporal image-fusion model (STI-FM) | Reconstruction-based |
Luo et al. [46] | Satellite Data Integration (STAIR) | Reconstruction-based |
Zhao et al. [47] | Robust Adaptive Spatial and Temporal Fusion Model (RASTFM) | Reconstruction-based |
Wang and Atkinson [48] | FIT-FC | Reconstruction-based |
Chen et al. [41] | Hierarchical Spatiotemporal Adaptive Fusion model (HSTAFM) | Learning-based |
Huang et al. [7] | Sparse representation based Spatio temporal reflectance Fusion Model (SPSTFM) | Learning-based model |
Song and Huang [49] | One-pair learning image fusion model | Learning-based model |
Wu et al. [50] | Spatial and Temporal Data Fusion Approach (STDFA) | Unmixing-based |
Huang and Zhang [51] | Spatio-Temporal Reflectance Fusion Model (U-STFM) | Unmixing-based |
Gevaert et al. [36] | Spatial and Temporal Reflectance Unmixing Model (STRUM) | Unmixing-based |
Wu et al. [52] | Modified Spatial and Temporal Data Fusion Approach (MSTDFA) | Unmixing-based |
Zurita-Milla et al. [53] | Constrained unmixing image fusion model | Unmixing-based |
Zhang et al. [54] | Spatial-Temporal Fraction Map Fusion (STFMF) | Unmixing-based |
Zhu et al. [12] | Flexible Spatiotemporal Data Fusion (FSDAF) | Hybrid |
Data Fusion Performance Metrics | Authors |
---|---|
Spectral angle mapper (SAM) | Yuhas et al. [108] |
Peak Signal-to-noise-ratio (SNR) | Sheikh et al. [116] |
Structural Similarity Index (SSIM) | Wang et al. [117] |
Image quality index | Wang et al. [110] |
Extended image quality index | Alparone et al. [111] |
Quality w/no reference index | Alparone et al. [114] |
Enhancement measure evaluation (EME) | Agaian et al. [115] |
Entropy | Tsai et al. [118] |
Erreur Relative Globale Adimensionnelle de Synthese (ERGAS) | Wald [113] |
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Belgiu, M.; Stein, A. Spatiotemporal Image Fusion in Remote Sensing. Remote Sens. 2019, 11, 818. https://doi.org/10.3390/rs11070818
Belgiu M, Stein A. Spatiotemporal Image Fusion in Remote Sensing. Remote Sensing. 2019; 11(7):818. https://doi.org/10.3390/rs11070818
Chicago/Turabian StyleBelgiu, Mariana, and Alfred Stein. 2019. "Spatiotemporal Image Fusion in Remote Sensing" Remote Sensing 11, no. 7: 818. https://doi.org/10.3390/rs11070818