Method for simultaneously detecting shadows of building roof, building wall body and ground

A building and ground technology, which is applied to building walls and ground shadows, and simultaneously detects the roof of buildings, which can solve the problems that there is no clear detection method

Pending Publication Date: 2019-10-29
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] Although the previous shadow detection methods can improve the shadow area detection of buildings to a large extent, most of the methods are only suitable for the shadow area detection

Method used

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  • Method for simultaneously detecting shadows of building roof, building wall body and ground
  • Method for simultaneously detecting shadows of building roof, building wall body and ground
  • Method for simultaneously detecting shadows of building roof, building wall body and ground

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example

[0022] In this embodiment, we select the digital building model of Denver, Colorado, USA for experimental processing.

[0023] Step 1, collect real-time data, and calculate the solar altitude angle α and solar azimuth angle ρ at the desired time according to the geographic latitude of the digital building model, the solar declination and solar hour angle of the day.

[0024] The solar altitude angle α, solar azimuth angle ρ at any time and the local geographic latitude m1, the solar declination m2 of the day, and the local solar hour angle t satisfy the following relationship:

[0025] sin(a)=sin(m1)sin(m2)+cos(m1)cos(m2)cos(t) (1)

[0026]

[0027] The solar elevation angle α and solar azimuth angle ρ can be obtained from formulas (1) and (2).

[0028] Step 2, according to the solar altitude angle and solar azimuth angle determined in step 1, combine figure 2 The schematic diagram of can determine the boundary of the shadow area cast on the ground by the building being ...

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Abstract

The invention discloses a method for simultaneously detecting shadows of a building roof, a building wall and the ground. The method is implemented according to the following steps. The method comprises the following steps: firstly, calculating a solar altitude angle and a solar azimuth angle at the moment according to the geographic latitude of the place where the digital building model is located, the solar declination (which is an included angle between an equatorial plane of the earth and a connecting line of the sun and the center of the earth) of the day and a solar hour angle (which isan angular distance from a celestial meridian circle of an observation point to a time circle where the sun is located); secondly, calculating the boundary of a shadow area projected on the ground according to the solar altitude angle and the solar azimuth angle; secondly, determining a shadow area boundary projected on the roof by introducing vector data into the DBM; and finally, combining and analyzing the shadow area boundary on the ground and the shadow area boundary on the roof of the building to determine the shadow area boundary on the wall body of the building. According to the method, the relationship between the building and the building shadow can be restored more accurately and more specifically.

Description

technical field [0001] The invention relates to the field of three-dimensional data processing of geographic space data, in particular to a method for simultaneously detecting building roofs, building walls and ground shadows. Background technique [0002] As the demand for urban buildings and the utilization rate of buildings continue to increase, real-time realistic building shadows are attracting more and more attention. Therefore, how to efficiently and quickly visualize the shadows of buildings is of great significance in architectural design, urban planning, urban construction, and urban management. [0003] Existing detection methods for building shadows are mainly based on the geometric shape of the scene, the sun elevation angle, DSM or sensors and other parameters to establish a three-dimensional model to detect building shadows. For example, Zhang Heng et al. improved an automatic shadow detection method based on multi-band spectral differences. It uses the geom...

Claims

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Application Information

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IPC IPC(8): G06T15/60
CPCG06T15/60
Inventor 周国清沙洪俊
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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