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相关概念视频

Methods of Obtaining Topography01:25

Methods of Obtaining Topography

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Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
69
Plotting of Topographic Maps01:29

Plotting of Topographic Maps

48
Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional representation of three-dimensional terrain. Creating a topographic map requires a systematic approach.Begin by plotting a scaled grid and marking intersections corresponding to the survey's elevation data points. Assign elevation values at these intersections to build the base map. Next, determine contour levels using a consistent contour interval,...
48
Design Example: Alignment of a Road Line Using GIS01:17

Design Example: Alignment of a Road Line Using GIS

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The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
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Vector Algebra: Graphical Method01:10

Vector Algebra: Graphical Method

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Vectors can be multiplied by scalars, added to other vectors, or subtracted from other vectors. The vector sum of two (or more) vectors is called the resultant vector or, for short, the resultant.
We use the laws of geometry to construct resultant vectors, followed by trigonometry to find vector magnitudes and directions. For a geometric construction of the sum of two vectors in a plane, we follow the parallelogram rule. Suppose two vectors are at arbitrary positions. Translate either one of...
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Manipulation and Analysis01:21

Manipulation and Analysis

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GIS manipulation and analysis functions are vital for decision-making and planning. These activities range from data retrieval tasks, such as selecting information based on specific criteria, to advanced analytical techniques that address complex spatial problems.One critical GIS analysis method is overlaying, which combines multiple data layers to examine impacts. For example, overlaying a river-dammed lake boundary with road networks can identify affected infrastructure. Another common...
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Topographic Surveying and Contours01:29

Topographic Surveying and Contours

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Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is essential in construction planning, water resource management, and land-use analysis. The primary outcome of such surveys is a topographic map, which uses contour lines to visually represent the shape and slope of the terrain, providing valuable insights into the landscape's characteristics.Contour lines are fundamental to understanding the...
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一种基于图形切割的远程传感方法,用于绘制阿尔卑斯山草原的地图.

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  • 1State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing, China.

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概括

科学家们开发了一种新的遥感方法,用于在西藏高原上绘制高山草原的地图. 这种技术准确地确定了高山草原的上限,这对于了解气候变化影响至关重要.

关键词:
陆地卫星 (Landsat) 是一个地球卫星.西藏高原是西藏的高原.阿尔卑斯山的草地线.气候变化 气候变化 气候变化边缘检测 边缘检测 边缘检测图形切割的图形切割方式

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科学领域:

  • 生态生态学 生态生态学
  • 遥感 遥感 遥感 遥感
  • 气候变化科学 气候变化科学

背景情况:

  • 气候变化改变了植被界限,影响了生态系统和气候.
  • 由于数据有限,阿尔卑斯山草原 (阿尔卑斯山草原) 的上层海拔极限尚不清楚.
  • 现有的方法缺乏大规模的高分辨率估计阿尔卑斯山草地线.

研究的目的:

  • 开发和验证一种新的,自动化的遥感方法,用于绘制阿尔卑斯山草地线的地图.
  • 为了确定西藏高原的高山草原的空间分布和海拔范围.
  • 为研究阿尔卑斯山草原对气候变化的反应提供基础.

主要方法:

  • 自动识别潜在的阿尔卑斯山草原山脉.
  • 使用Landsat反射率和线性差异分析进行自适应特征生成.
  • 集成Otsu和Canny方法的图形切割算法,用于精确地划分草地线.

主要成果:

  • 开发了一种用于30米分辨率阿尔卑斯山草原地图的新方法.
  • 在对无人机和PlanetScope图像 (R2 = .99, .98) 的验证中实现了高精度.
  • 西藏高原的阿尔卑斯山草原的高度从4038米到538米,具有明显的区域格局.

结论:

  • 这项研究介绍了第一个大型遥感方法,用于绘制阿尔卑斯山草原的地图.
  • 开发的方法为生态监测提供了高精度和分辨率.
  • 这些发现为了解气候变化下的阿尔卑斯山生态系统动态提供了关键数据.