Automatic optical-to-synthetic aperture radar (SAR) image matching is still a challenging task due to the existence of severe nonlinear radiometric differences between images and presence strong speckles in SAR images. To address this problem, we propose novel feature descriptor called rank-based local self-similarity (RLSS) for optical-to-SAR template matching. The RLSS an improved version (LSS) descriptor, inspired by Spearman's rank correlation coefficient statistics. It can describe...

Because optical and synthetic aperture radar (SAR) images are complementary, their registration has received extensive attention in joint applications. However, robust SAR image is challenging due to substantial geometric radiometric differences. To address this problem, we propose a fast algorithm for based on novel feature type known as the adjacent self-similarity (ASS). The ASS of pixelwise representation defined quickly finely capture structural features image. extracted by using an...

The simultaneous measurement of relative humidity (RH) and temperature with an optical fiber sensor is proposed based on a microfiber coupler (MFC) coated single layer molybdenum disulfide (MoS2) nanosheets. MFC fabricated using flame heating technology has waist diameter approximately 6 µm length 3 mm. As the RH increases, effective refractive index MoS2 varies as result electric charge transfer, spectrum dip shifts toward longer wavelengths, transmission intensity decreases. cladding in...

Synthetic aperture radar (SAR) images in different polarizations or from sensors are becoming easily available, but registering these is challenging because of the presence significant speckles SAR and existence radiometric differences between images. To address problems, we propose a novel feature descriptor named rank-based ratio self-similarity (RRSS) for robust image registration. The first calculates surface by replacing distance surface, as use more to multiplicative noise, then sorts...

The urban green cover in high-spatial resolution (HR) remote sensing images have obvious multiscale characteristics, it is thus not possible to properly segment all features using a single segmentation scale because over-segmentation or under-segmentation often occurs. In this study, an unsupervised cross-scale optimization method specifically for proposed. A global optimal first selected from results by indicator. regions the are then isolated into under- and fine-segmentation parts....

Lake ice thickness (LIT) is one of the key climate variables in lake domain, but there are currently large uncertainties retrieval LIT. We present and validate a new LIT method that utilizes ICESat-2 data to assist CryoSat-2 echo peak selection, aiming improve accuracy enable acquisition without on-site measurements. The involves screening out similar tracks based on time space constraints. It also dynamically adjusting range constraint window waveforms high-precision surface ellipsoid...

A simple U-shaped plastic optical fiber evanescent-wave sensor was fabricated for temperature-independent highly sensitive detection of humidity. The sensing region the subjected to five cycles heating-cooling improve temperature independence. effects polyimide (PI) coating thickness, number graphene oxide (GO) layers, and alternate PI-GO sequence were investigated optimize sensitivity. exhibited high-temperature independence good sensitivity 0.17×10-2 (% relative humidity)-1 in range 10°C 70°C.

A high-sensitivity interferometric optical microfiber sensor based on liquid cladding is proposed to detect samples temperatures in special environments. The manufactured by arc discharge and flame-brushing technology encapsulated a capillary tube covered with deionized water. more susceptible the influence of external environment due strong evanescent field tapered fiber surface. High-sensitivity measurement near room temperature important, which can be used for effective diagnosis...

Although winter wheat has been mapped by remote sensing in several studies, such mapping efforts did not sufficiently utilize contextual information to reduce the noise and still depended heavily on optical imagery exhausting classification approaches. Furthermore, influence of similarity measures identification remains unclear. To overcome these limitations, this study developed an object-based automatic approach map using multitemporal Sentinel-1 (S1) Sentinel-2 (S2) imagery. First, after...

We present a novel echo-based synthetic aperture radar (SAR) image simulation method that comprehensively utilizes both SAR effective view and ray tracing algorithms. To improve the fidelity of simulated images, we first design an algorithm to process selected facet target model, with purpose discretizing facets in into lattice targets ensuring interval is set strictly following Nyquist sampling law. Then, combine echo time-domain perform based on tracing. Various kinds backscatter...

Optical fiber microfluidics technology can implement the mutual tune of light field and fluid in micro-nano scale. In this paper, one core high-birefringence photonic crystal (Hi-Bi PCF) is used as a microfluidic channel. The birefringence Fe3O4 nanofluid experimentally theoretically investigated by selectively infiltrating magnetic into Hi-Bi PCF. presence alters original PCF be modulated intensity external field. optical distribution simulated, with selective filling approximately...

We present a novel fast synthetic aperture radar (SAR) image simulation method based on the echo matrix cell algorithm including multiple scattering. To improve efficiency of SAR while ensuring fidelity simulated results, we first discretized target facets set in beams footprint into lattice targets using range-Doppler (RD) imaging geometry model and provided basis for simulating electromagnetic wave transmission. Based waves transmission, used ray tracing to calculate backscattering field...

The measurement of chloride ion concentrations has been studied for the purpose monitoring quality water resources. In this paper, a sensor based on microfiber coupler with Sagnac loop is proposed. coupler, which acts as sensing unit and diameter 10 μm length 1 mm, fabricated using flame-brushing technique, two ends are connected to form loop, reflector enhance reflection in structure. Experimental results show that sensitivity reaches maximum 423 pm/‰ detection limit concentration 0.447‰ at...

Line detection on synthetic aperture radar (SAR) images is still challenging due to the existence of strong speckles. This article proposes a novel line method for SAR based vector Radon transform (VRT). First, ratio exponentially weighted averages operator determined calculate edge map. Then, VRT proposed map into parameter and decompose along angle projection two mutually perpendicular components, i.e., parallel component vertical component, which strips off part random information ensures...

In recent years, target detection has drawn increasing attention in the field of radar signal processing. We consider problem coherent integration for detecting a highly maneuvering with complex motion, involving range migration (RM), linear Doppler frequency migration, and quadratic within interval. Owing to different sensitivity envelope phase parametric nonparametric models are, respectively, established. A coarse-to-fine algorithm is correspondingly proposed. Specifically, keystone...

Medical service matching between suppliers and demanders should be emphasised. The supply chain promotes the development of practical decision-making methods. However, little is known about general approaches used to explore problems in context medical management. We put forward an effective two-stage method, including a grouping model model, that considers patient similarity bilateral preferences. constructed based on matrix patients. Next, specific rules are employed calculate integrated...

For mapping a large area with airbrone synthetic aperture radar (SAR), very high-resolution (VHR) images using radargrammtry, block adjustment, where strips and blocks of are processed together, is preferred method for geometric processing the advantage reducing needed number ground control points (GCPs). However, weak intersection geometry between adjacent from same strip conflicts solvability iterative least squares adjustment. In order to overcome this challenge, article focuses on...