Any idea, methods, research on how I measure the vertical Profile of a city?! or even extract the skyline of a city! and the topology of the city is in a valley ?!
Exactly no knowledge of farsightedness but it would be Measuring the vertical profile of a city and extracting its skyline can be accomplished through various methods and research approaches. Here are some ideas and techniques that can help you in this endeavor, particularly when dealing with a city situated in a valley:
LiDAR (Light Detection and Ranging): LiDAR technology uses laser pulses to measure distances and create detailed 3D representations of the Earth's surface. It can be employed to capture the vertical profile of a city, including buildings, trees, and terrain. By analyzing the returned laser signals, you can extract elevation data and identify the skyline of the city.
Digital Elevation Models (DEM): DEMs are digital representations of the Earth's surface that provide elevation information across a given area. By utilizing DEM data, you can measure the vertical profile of a city within a valley. DEMs can be generated using techniques such as LiDAR, photogrammetry, or satellite imagery.
Satellite Imagery and Photogrammetry: Satellite images and aerial photographs offer valuable visual information that can be used to measure the vertical profile of a city. By analyzing the height and shape of buildings and other structures, you can estimate the city's skyline. Photogrammetry, a technique that involves extracting measurements from images, can be applied to create accurate 3D models of the city.
GIS (Geographic Information System) Analysis: GIS tools provide a comprehensive platform for analyzing geographical data. By integrating elevation data, satellite imagery, and other geospatial information, you can measure the vertical profile and extract the skyline of a city within a valley. GIS software allows for complex spatial analysis, visualization, and manipulation of data to derive meaningful insights.
Point Cloud Processing: Point clouds, derived from LiDAR or photogrammetry data, contain millions of points representing the shape and elevation of objects in the city. By processing point cloud data using specialized software, you can generate accurate 3D models, measure building heights, and extract the skyline of the city.
Machine Learning and Image Processing: Utilizing machine learning algorithms and image processing techniques, you can train models to automatically detect and extract buildings and their heights from aerial or satellite images. These methods can aid in measuring the vertical profile and identifying the skyline of a city.
Madhav Prasad Koirala , thanks for the intensive answer!!
I am more GIS person, not a fan with RS techniques ( although it is very useful and professional ), so I have to figure out / develop something with GIS, Thanks again!