نتایج جستجو برای: gdem1 gdem2 nidem srtm
تعداد نتایج: 944 فیلتر نتایج به سال:
The Shuttle Radar Topography Mission SRTM produced the first global digital elevation model (DEM) data set of the world’s topography in the year 2000. The data set covers regions between ±60 degrees latitude with a resolution of 30 meters. The 90 % height accuracy in these regions is on the range of 6 meters, limited by the baseline length, the metrology and the instrument noise. In mountainous...
In this paper, we borrow from blind noise parameter estimation (BNPE) methodology early developed in the image processing field an original and innovative no-reference approach to estimate Digital Elevation Model (DEM) vertical error parameters without resorting to a reference DEM. The challenges associated with the proposed approach related to the physical nature of the error and its multifact...
Digital Elevation Model is one of the most important data for watershed modeling whit hydrological models that it has a significant impact on hydrological processes simulation. Several studies by the Soil and Water Assessment Tool (SWAT) as useful Tool have indicated that the simulation results of this model is very sensitive to the quality of topographic data. The aim of this study is evaluati...
This study makes contributions toward development of accurate DEM from ground and satellite data over South Africa. is achieved by preparing recent satellite-based DEMs (AW3D30, SRTM, ASTER, TanDEM-X, MERIT), assessing their vertical accuracy, selecting candidate DEMs, modelling errors for the fusing DEMs. Following removal outliers each DEM, a different number levelling are used in assessment ...
Bài báo đề cập đến việc cải thiện độ chính xác của mô hình số cao (Digital Elevation Model - DEM). Mặc dù, các thuật toán tái chia mẫu song tuyến, bicubic, Kriging và tăng phân giải bằng mạng nơ ron Hopfield (HNN) cho phép nâng cao, đặc biệt là từ nguồn dữ liệu toàn cầu như SRTM, ASTER, v.v., sự tham gia bổ sung cũng có thể hơn nữa cao. này xuất một HNN với hàm hiệu chỉnh thay đổi điều kiện ràn...
BACKGROUND AD is a progressive neurodegenerative disorder that is associated with the accumulation of two different insoluble protein aggregates, Aβ plaques and hyperphosphorylated tau. This study aimed to investigate the optimal acquisition and quantification of [18F]AV45 and [18F]AV1451 to image Aβ and tau, respectively, in subjects with AD. Fifteen subjects with early stage AD underwent a T1...
We examined the reproducibility of using the constant infusion paradigm for equilibrium measurement of D2/3 receptors using [ C](+)-propyl-hexahydro-naphtho-oxazin (PHNO) positron emission tomography (PET). Six subjects were scanned with a bolus plus constant infusion (Kbol 5 80 minutes) of [ C]-(+)-PHNO. Binding potential (BPND) was computed using the equilibrium approach and compared to a sim...
Digital elevation models (DEMs) have become a recognized tool in the visualization of his torical sites. Applications range through various scales from 3D presentations of the settings of individual buildings up to detailed GIS analysis of the hinterlands of archaeological sites. However, the development of space-borne instruments has seen the rise of high resolution DEMs even on the global sca...
UNLABELLED It has been demonstrated in vitro that the dopamine D(2) receptor has 2 interconvertible affinity states for endogenous dopamine, referred to as the high- and the low-affinity states. (11)C-(R)-2-CH(3)O-N-n-propylnorapomorphine ((11)C-MNPA) is a new agonist radioligand for in vivo imaging of the high-affinity state of dopamine D(2) receptors using PET. In the present study, the kinet...
During the Holocene, Tigris-Euphrates river system (Lower Mesopotamian Plain) was characterized by a complex morphodynamic due to climatic fluctuations, shoreline shifting, and human activities. Within wide barren floodplain with low elevation ranges, remote sensing multi-sensor approach is suitable identify main geomorphological features associated geomorphic processes. Optical multispectral i...
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