搜索结果: 1-15 共查到“测绘科学技术 DEM”相关记录182条 . 查询时间(0.062 秒)
相对于星载和机载SAR而言，使用车载SAR数据提取DEM可有效缩短DEM数据更新周期，降低成本。由于车载SAR平台结构可变，干涉定标需要重复进行，本文提出了基于单控制点的车载双天线干涉SAR的DEM提取方法。该方法基于单个控制点的精确坐标信息进行相位、斜距和高程改正，并实现高程的迭代求解，无需布设大量控制点进行干涉定标，有效简化外业工作。仿真试验证明：当基线长度估计达到毫米级精度，基线倾角估计也达...
DEM约束的卫星影像定位法
DEM 卫星影像区域网平差 RFM通用成像模型 卫星影像无控定位
2020/3/19
作为“云控制”摄影测量理论和方法的发展，研究了DEM约束的立体卫星影像区域网平差方法。与DEM仅作为高程控制信息使用，或者是通过DEM表面匹配实现绝对定向的间接定位方法不同，DEM作为平高控制信息被直接引入至基于RFM模型的卫星影像区域网平差之中。本文方法将连接点地面高程与DEM格网内插高程之差作为虚拟观测值构建约束方程，不仅利用了DEM高程信息，并且利用了其地形曲面包含的平面信息，以“云控制”方...
DEM地表坡向变率的向量几何计算法
DEM 坡向变率 坡向 向量几何法
2019/11/25
作为计算坡向变率的数据基础，坡向矩阵具有方向性，以标量的方式计算带有方向属性的数据，将带来计算方式的误区及计算结果的偏差。本文以数学高斯曲面和不同黄土地貌样区5 m分辨率DEM数据为基础，针对坡向数据具有方向性的特点，设计基于数学向量的坡向变率计算方法。首先针对坡向数据进行极坐标转换，形成坡向矩阵的向量几何表达；然后以该坡向向量数据为基础来计算坡向变率；最后将本文方法的计算结果与传统标量方法的计算...
A METHOD OF GENERATING DEM FROM DSM BASED ON AIRBORNE INSAR DATA
InSAR DSM Adaptive Threshold Segmentation DEM, Filtering
2018/5/15
Traditional methods of terrestrial survey to acquire DEM cannot meet the requirement of acquiring large quantities of data in real time, but the DSM can be quickly obtained by using the dual antenna s...
TOWARDS THE OPTIMAL PIXEL SIZE OF DEM FOR AUTOMATIC MAPPING OF LANDSLIDE AREAS
Landslide landslide mapping DEM resolution Neural Net classification Maximum Likelihood classification
2017/7/12
Determining appropriate spatial resolution of digital elevation model (DEM) is a key step for effective landslide analysis based on remote sensing data. Several studies demonstrated that choosing the ...
INFLUENCE OF DEM IN WATERSHED MANAGEMENT AS FLOOD ZONATION MAPPING
GIS DEM Drainage Pattern Flash-Floods Hydrological Model Stream Network Flow Accumulation
2016/11/30
Despite of valuable efforts from working groups and research organizations towards flood hazard reduction through its program, still minimal diminution from these hazards has been realized. This is ma...
STATISTIC TESTS AIDED MULTI-SOURCE DEM FUSION
DEM Fusion Blunder Detection Statistic Test
2016/11/15
Since the land surface has been changing naturally or manually, DEMs have to be updated continually to satisfy applications using the latest DEM at present. However, the cost of wide-area DEM producti...
MAPPING LANDSLIDES IN LUNAR IMPACT CRATERS USING CHEBYSHEV POLYNOMIALS AND DEM’S
Planetary mapping Impact craters Landslides Chebyshev polynomials
2016/11/15
Geological slope failure processes have been observed on the Moon surface for decades, nevertheless a detailed and exhaustive lunar landslide inventory has not been produced yet. For a preliminary sur...
DEVELOPMENT AND EVALUATION OF SIMPLE MEASUREMENT SYSTEM USING THE OBLIQUE PHOTO AND DEM
Photogrammetry Measurement DEM Orientation System Development
2016/11/11
When a disaster occurs, we must grasp and evaluate its damage as soon as possible. Then we try to estimate them from some kind of photographs, such as surveillance camera imagery, satellite imagery, p...
SHAPE AND ALBEDO FROM SHADING (SAfS) FOR PIXEL-LEVEL DEM GENERATION FROM MONOCULAR IMAGES CONSTRAINED BY LOW-RESOLUTION DEM
Moon DEM Shape and Albedo from Shading (SAfS) Monocular Image
2016/11/8
Lunar topographic information, e.g., lunar DEM (Digital Elevation Model), is very important for lunar exploration missions and scientific research. Lunar DEMs are typically generated from photogrammet...
The near-global elevation product from NASA’s Shuttle Radar Topographic Mission (SRTM) has been widely used since its release in 2005 at 3 arcsecond resolution and the release of the 1 arcsecond versi...
QUALITY TEST VARIOUS EXISTING DEM IN INDONESIA TOWARD 10 METER NATIONAL DEM
Quality Test DEM Indonesia
2016/11/8
Indonesia has various DEM from many sources and various acquisition date spreaded in the past two decades. There are DEM from spaceborne system (Radarsat, TerraSAR-X, ALOS, ASTER-GDEM, SRTM), airborne...
In 2016, the US/Japan ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) project released Version 3 of the Global DEM (GDEM). This 30 m DEM covers the earth’s surface from 82...
ANALYSIS OF INFLUENCE OF TERRAIN RELIEF ROUGHNESS ON DEM ACCURACY GENERATED FROM LIDAR IN THE CZECH REPUBLIC TERRITORY
DEM LIDAR ALS Accuracy Micro-relief Terrain slope Terrain roughness
2016/11/8
Digital elevation models are today a common part of geographic information systems and derived applications. The way of their creation is varied. It depends on the extent of area, required accuracy, d...
DEM RECONSTRUCTION USING LIGHT FIELD AND BIDIRECTIONAL REFLECTANCE FUNCTION FROM MULTI-VIEW HIGH RESOLUTION SPATIAL IMAGES
DSM reconstruction BRDF Light field Image sequence
2016/7/27
This paper presents a method for dense DSM reconstruction from high resolution, mono sensor, passive imagery, spatial panchromatic image sequence. The interest of our approach is four-fold. Firstly, w...