نتایج جستجو برای: digital elevatiom model dem
تعداد نتایج: 2373347 فیلتر نتایج به سال:
This paper presents a method for co-registration of Chang’E-1 lunar orbiter stereo images and laser altimeter (LAM) data for 3D mapping of lunar surface. First, a digital elevation model (DEM) is automatically generated from the three-line CCD stereo images based on rigorous pushbroom sensor model and multi-level image matching. The DEM is then registered to LAM data through surface matching wi...
Hyperspectral remote sensing is used in precision agriculture to remotely and quickly acquire crop phenotype information. This paper describes the generation of a digital orthophoto map (DOM) and radiometric calibration for images taken by a miniaturized snapshot hyperspectral camera mounted on a lightweight unmanned aerial vehicle (UAV). The snapshot camera is a relatively new type of hyperspe...
The Shuttle Radar Topography Mission (SRTM) delivered a digital terrain model of better spatial resolution and accuracy than traditional free global DEM datasets at near-global coverage and made a wide range of detailed hydrologic applications feasible. In this study, the SRTM data is compared with the digitalized topographic contour DEM in hydrological analysis over the QingJiang catchment in ...
TanDEM-X is the first bistatic space borne SAR mission [1]. It is formed by adding a second, almost identical spacecraft to TerraSAR-X and flying them in a closely controlled formation with typical distances between 250 m and 500 m. The primary goal of the mission is the derivation of a high-precision global Digital Elevation Model (DEM) according to HRTI level 3 quality [2]. To achieve this ac...
Photogrammetric digital elevation models (DEMs) are often used to derive and monitor surfaces in inaccessible areas. They have been used to monitor the spatial and temporal change of glacier surfaces in order to assess glacier response to climate change. However, deriving photogrammetric DEMs of steep mountainous topography where the surface is often obscured by regions of deep shadow and snow ...
A new digital elevation model (DEM) is presented for accurate surface representation in photogrammetric processing of stereo ground-based imagery. This model is named the continuative variable resolution DEM (cvrDEM). In contrast to traditional grid-based DEMs that have only one fixed resolution, this new model can provide resolutions that vary depending on the range represented in the groundba...
یکی از منابع اطلاعاتی مورد نیاز در تعیین ویژگیهای گیتاشناسی حوضههای آبخیز دادههای ارتفاعی است. شبیه رقومی ارتفاع[1] (DEM) یکی از محصولات تصاویر ماهوارهای سنجنده ی تشعشع سنج پیشرفته ی فضابرد تابش گرمایی و بازتابی[2] (ASTER) است. هدف این تحقیق، تعیین ویژگیهای گیتاشناسی حوضه ی آبخیز با استفاده از DEM حاصل از سنجنده ی ASTER است. بدین منظور دشت کبود راهنگ به عنوان محدوده ی مطالعاتی انتخاب ...
The accuracy of a digital elevation model (DEM) generated from synthetic aperture radar (SAR) interferometry (InSAR) crucially depends on the length of the perpendicular baseline between SAR acquisitions. ERS-2 and Envisat cross-InSAR (CInSAR) are superior methods to create high precise DEM because the perpendicular baseline can be extended sufficiently long by compensating a slight difference ...
Image Registration implies mapping images having varying orientation, multi-modal or multi-temporal images to map to one coordinate system. Digital Elevation models (DEM) are images having terrain information embedded into them. DEM-to-DEM registration incorporate registration of DEMs having different orientation, may have been mapped at different times, or may have been processed using differe...
This paper presents the generation of DEM using six pairs of Radarsat-1 images for part of tropical terrain in Malaysia. The images were acquired with various beam modes and incident angles and used to generate DEMs by means of radargrammetry based on two SAR imaging models: Range-Doppler and Co-linearity condition equations model. First, the physical basis of these two models was assessed, and...
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