课程文献中心 更多>>

关键词： Hyperspectral image fusion   Jilin-1   pansharpening   hypersharpening   remote sensing  

摘要： The objective of this study is to enhance the 10 m (B7-B12) and 20 m (B13-B19) spatial resolution bands of the Jilin-1 GP02 satellite imagery through fusion with the 5 m (B0-B6) bands, thereby producing high-accuracy 5 m hyperspectral (HS) bands and improving the usability of this dataset for diverse remote sensing applications. A series of experiments were conducted using different data configurations and state-of-the-art fusion algorithms to assess the impact of spectral compatibility, scale ratio and algorithmic design on fusion performance. Among all configurations, Experiment 2.c, which fused the B7-B19 bands with a spectrally compatible synthetic panchromatic (PAN) image generated by averaging the B1-B6 bands, achieved the best quantitative and qualitative results. These results confirm that employing a synthetic PAN image closely aligned with the spectral characteristics of the target HS data effectively minimizes spectral distortion and enhances spatial fidelity compared with conventional PAN- or MS-based fusion schemes. Algorithmic evaluations further demonstrated that physically and contextually informed models such as C-MTF-GLP-CBD, PRACS, and BDSD-PC exhibited robust and consistent performance across different environments, while HS-MS fusion approaches (Experiments 3.a and 3.b) were found to be less effective. This study contributes to the literature by presenting one of the first comprehensive evaluations of high-resolution HS fusion using Jilin-1 GP02 data, which is gaining increasing importance in global Earth observation. The results establish a methodological framework for generating high-resolution HS products from Jilin-1 GP02 imagery and provide valuable insights to guide future research and technological development in data fusion for advanced Earth observation applications.

关键词： halide immiscibility   n=1 2d perovskite   narrowband detection   photoconductors   photodetector  

摘要： 2D perovskites featuring a single layer of perovskite octahedra sandwiched between organic cations (n = 1) display narrow absorption due to their quantum-confined structure. They offer a compelling route to filter-free, narrowband photodetection compared with broadband 3D counterparts. While halide mixing provides spectral tunability, it introduces severe phase segregation and energetic disorder. Current understanding of this phenomenon is derived mainly from static material characterisation, leaving its dynamic impact in operational devices unexplored. Herein, we bridge this gap by integrating n = 1 (PEA)2PbBrxI4-x into photoconductors, achieving tunable response from 400 to 520 nm, and a maximum specific detectivity (D *) of 2.11 & times;1011 Jones at an applied bias of 20 V. We reveal the existence of two different phases and the gradual transition based on halide compositions, studied how mixing halide drives phase segregation with density functional theory calculations. Although the chloride additive PEACl suppressed phase segregation in mixed halides, it introduced additional traps that reduced photocurrent. The additive enhanced the out-of-plane orientation, disrupting in-plane transport in photoconductors, but significantly improved performance in photodiodes. This work provides the first device-level insight into halide immiscibility in n = 1 2D-perovskites, revealing that overcoming the performance limitations in these systems requires balancing long-range structural order with short-range electronic disorder.