Urbanization processes greatly change urban landscape patterns and the thermal environment. Significant multi-scale correlation exists between land surface temperature (LST) pattern. Compared with traditional linear regression methods, model based on random forest has advantages of higher accuracy better learning ability, can remove features. Taking Beijing’s metropolitan area as an example, this paper conducted relationship analysis 3D LST using Pearson Correlation Coefficient (PCC),...

Compared to various optical remote sensing data, studies on the performance of dual-pol Synthetic aperture radar (SAR) lithology discrimination are scarce. This study aimed at using Sentinel-1 data distinguish dolomite, andesite, limestone, sandstone, and granite rock types. The backscatter coefficients VV VH, ratio VV–VH; decomposition parameters Entropy, Anisotropy, Alpha were firstly derived Kruskal–Wallis rank sum test was then applied these polarimetric matrices assess significance...

Lithological mapping using dual-polarization synthetic aperture radar (SAR) data is limited by the low classification accuracy. In this study, we extract ten parameters (backscatter coefficients and polarization decomposition parameters) from Sentinel-1 dual-pol SAR data. Using 94 mother wavelet functions (MF), a one-level two-dimensional discrete transform (DWT) applied to all parameters, suitable MF screened comparing overall accuracy F1 score. Finally, lithological of study area...

Previous remote sensing studies have used optical images to map lithology, commonly based on a single-date product extract spectral diagnostic features or other geology-related aid interpretation. Yet, the performance of time-series multi-date in lithology mapping has rarely been discussed. In this study, we employed (TS) Landsat-8 products semi-arid area Xinjiang, China. First, extracted TS reflectance from multispectral data, and then surface moisture, greenness, brightness via tasseled...

Due to rapid economic growth, urbanization, and population expansion, human society is facing increasing pressure on natural resources the environment. Vegetation cover closely related these issues, as a key indicator of ecological health, it crucial for maintaining biodiversity, preventing soil erosion, promoting social well-being. Remote sensing technology, due its high efficiency low cost, has become primary means monitoring vegetation coverage. In this study, Songhua Lake Basin in Jilin...

Abstract The cabin pressure control system is typically nonaffine-nonlinear time-varying system. In this paper, the fuzzy PID method optimized by gray wolf algorithm proposed to solve problems of large overshoot and long adjustment times in traditional methods. Simulation results show that paper improves dynamic characteristics system, reduces error time, stabilizes process, comfortableness passengers.

Shallow water bathymetry is essential for maritime navigation, environmental monitoring, and coastal management. While traditional methods such as sonar airborne LiDAR provide high accuracy, their cost time-consuming nature limit application in remote sensitive areas. Satellite sensing offers a cost-effective rapid alternative large-scale bathymetric inversion, but it still relies on significant situ data to establish mapping relationship between spectral depth. The ICESat-2 satellite, with...

The internal structures are the key to understand surface evolution of Moon. However, study such kind is absent. In this study, Chang'e-2 microwave radiometer data employed explore in highlands western lunar farside combined with FeO+TiO2 abundance and rock data. results as follows. First, a new view on cratering mechanism proposed according brightness temperature (TB) performances estimated abundances King, Bruno, Necho craters. Second, influential rocks TB initially identified by thermal...

Gas foil journal bearings (GFJBs) have been widely employed in high-speed rotating machinery the aviation industry. However, role of fluid–structure interaction unsteady aerodynamic character gas film and dynamic response elastic foils not yet clarified. In this study, an shearing flow interacting with exciting deformation top or bump was investigated by means a large eddy simulation bidirectional (BFSI). The result shows that main frequencies amplitudes stable fluctuations different field...

With increasing demand for load capacity and dynamic responses, the new generation of Gas Dynamic Foil Bearings (GDFB), assembled from preloaded elastic multi-leaf foils, has been put forward. It exhibits steady characteristics that are more sensitive to contact friction produced by foil–foil bearings housings foil bearings, distinguishing its response rigidity those classic bearings. This study aims employ numerical simulations explore GDFBs conjugated with using foils. A method...

Few people use remote sensing data to simultaneously retrieve the seasonal changes in aerosol optical depth (AOD) on land and ocean, as well its relationship with surface temperature. Aerosols, one of indicators air pollution, directly or indirectly affect people's numerous activities. This article uses Terra satellite MODIS source conducts AOD inversion work ocean areas around Shanghai, China based IDL, 6S model, dark pixel method. The results show that for areas, higher temperature, lower...

Abstract Distinguishing different kinds of igneous rocks is difficult because their subtle differences. Synthetic aperture radar (SAR) sensitive to rock surface morphology, which can help a lot in classification. Dual-pol SAR data have the advantages low cost, but few articles are using only dual-pol for In this study, we explored performance distinguishing granitoid, tuff, and syenite porphyry. Backscatter coefficients, polarization decomposition parameters, texture features from gray-level...

The potential use of time-series Sentinel-1 synthetic aperture radar (SAR) data for rock unit discrimination has never been explored in previous studies. Here, we employed to discriminate Dananhu formation, Xinjiang group, Granite, Wusu Xishanyao and Diorite Xinjiang, China. Firstly, the temporal variation backscatter metrics (backscatter coefficient coherence) from April October derived Sentinel-1, was analyzed. Then, significant differences SAR among different units were checked using...

China's vast sea area, coral reefs are important marine resources, but also an part of land resources. Remote sensing monitoring and studying their geological conditions changes great significance to the development environmental protection. In recent years, with promotion high-resolution remote images, images widely used in classification reefs. Aiming at problems fuzzy boundary low accuracy traditional methods for reef classification, a method based on Deeplabv3 + network model is...

The sun glint has been proven to be a valuable natural polarization calibration target because it is strongly polarized, and its characteristics can accurately simulated with models. It convenient calibrate the satellite’s in-flight polarimetry by comparing simulations actual measurements. Meanwhile, accuracy of simulation at top atmosphere (TOA) over affected several atmospheric oceanic surface factors depends on specific solar-viewing geometry. In this paper, sensitivity degree linear...

Prediction tasks over pixels in hyperspectral images (HSI) require careful effort to engineer the features used for learning a classifier. However, generated classification map may suffer from an over-smoothing problem, which is manifested significant differences original image terms of object boundaries and details. To address this we designed method extracting spectral–spatial-band-correlation (SSBC) features. In SSBC features, joint spectral–spatial feature extraction considered discrete...

Abstract A hybrid thermal management system model of hypersonic vehicle with liquid hydrogen as heat sink and thermoelectric conversion Brayton cycle was established. The cooling effect, fuel flow demand characteristics the in flight envelope were studied by numerical simulation. results show that refrigerant loop is about 0.22g/kW.s~0.24g/kW·s, aerothermal 0.11g/kW·s, engine wall 0.08g/kW·s. rate can be saved 25%∼40% during conversion. Thermoelectric efficiency generation reach up to 38%...

Vegetation hinders the acquisition of bedrock spectra and makes it difficult to classify with remote sensing data. Previous studies indicated can control vegetation growth through soluble nutrients water-holding capacity. However, potential using spectral features map has been rarely explored. This study first derived reflectance indices from time series Sentinel-2 products, then a spatiotemporal analysis on different was performed, finally combined random forest classifiers bedrock. The...

Patchwise methods have been widely used in hyperspectral image (HSI) classification. In HSI classification that use only spectral information, a large number of unlabeled pixels, known as background are removed before training, which loses spatial information. obtain patches through local window to retain the spectral-spatial information pixels. Larger more but redundant extracted high-dimensional features reduces accuracy. Due complex and uneven distribution land cover classes, class...

Lithological classification is a pivotal aspect in the field of geology, and traditional surveys are inefficient challenging certain areas. Remote sensing technology offers advantages such as high efficiency wide coverage, providing solution to aforementioned issues. The aim this study apply remote for lithological attempt enhance accuracy classification. Taking area Jixi, Heilongjiang Province, China, an example, conducted using high-resolution satellite data from GF-2 texture based on...