Irregular urban heat island footprint extraction method based on angle segmentation
An angle segmentation and urban heat island technology, applied in temperature recording, image analysis, radiation pyrometry, etc., can solve the problem of inability to accurately extract irregular urban heat island footprints, and achieve the effect of reducing the impact
Pending Publication Date: 2022-07-29
NANTONG UNIVERSITY +1
View PDF0 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] In view of the above problems, the purpose of the present invention is to provide a method for extracting urban heat island footprints based on angle segmentation, to solve the problem that the current irregular urban heat island footprints cannot be accurately extracted
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0043] The present invention will be further described in detail by the following examples. The following examples are to explain the present invention and the present invention is not limited to the following examples.
[0044] A method for extracting urban heat island footprint based on angle segmentation of the present invention comprises the following steps:
[0045] Step 1: Obtain Landsat remote sensing image data and use the single-window algorithm to calculate the surface temperature (Tb is the TOA brightness temperature in the TIR channel, ε is the surface emissivity of the same channel. Algorithm coefficient A i , B i and C i Surface temperature was calculated from linear regression of radiative transfer simulations performed on 10 categories of atmospheric column water vapor totals (I = 1, . . . , 10).
[0046] Step 2: Obtain NPP-VIIRS images, and extract built-up areas based on dynamic threshold dichotomy. The formula is: (where H(i,j) is the pixel value of th...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides an irregular urban heat island footprint extraction method based on angle segmentation. Firstly, based on a multi-source remote sensing image, the surface temperature is inverted, a city built-up area is extracted by using a dynamic threshold dichotomy, and then the city form is measured and calculated. Secondly, a plurality of buffer rings with the interval of 1 km are drawn from the boundary of the urban built-up area, the built-up area and the buffer rings of the built-up area are divided into sixteen quadrants at equal angles, then the average temperature on each ring is counted, a temperature curve is drawn, and abnormal quadrants are removed; thirdly, integrating the residual quadrant temperature curves, and fitting a footprint extension distance and a background temperature value by using an exponential decay model; and finally, according to the extension distance obtained by fitting and the background temperature value, jointly constraining the heat island influence range, and obtaining the urban heat island footprint. According to the method, the influence of the urban form and the peripheral landscape of the built-up area is reduced to the maximum extent, the more accurate heat island footprint is obtained, and suggestions are provided for urban thermal environment research and urban planning management.
Description
technical field [0001] The invention relates to an urban heat island footprint extraction method based on angle segmentation, in particular to an urban heat island footprint extraction method for cities with irregular shapes. Background technique [0002] An urban heat island is a phenomenon in which the air and surface temperatures in urban areas are significantly higher than those in suburban areas. With the acceleration of urbanization, the surface urban heat island phenomenon has a negative impact on the health and comfort of urban residents, and greatly increases energy consumption, which has become an important research topic in various fields. Some scholars put forward the index of heat island footprint, which quantifies the area affected by the heat island effect, and comprehensively considers the size and spatial extent of the heat island effect. At present, the methods for determining heat island footprints are roughly divided into two categories. One uses Gaussia...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/00G01J5/48G06T7/10
CPCG01J5/007G01J5/48G06T7/10G01J2005/0077
Inventor 杨柯周侗陶菲韩琪乐王楚玲王瑜王子龙孙健
Owner NANTONG UNIVERSITY