Method for detecting land cover changes based on spectral slope differences
A technology for surface coverage and difference detection, applied in image data processing, instrumentation, computing, etc., can solve problems such as difficulty in distinguishing true changes from false changes
Active Publication Date: 2015-04-15
NAT GEOMATICS CENT OF CHINA
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Intrinsic noise usually affects the magnitude of the spectral curve. The traditional change detection method calculates the magnitude of the change intensity of the spectral value in the spectral space, which makes it difficult to distinguish between true changes and false changes.
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[0038] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific implementations of the present invention are now described.
[0039] The implementation steps and principles of a method for detecting land cover changes based on spectral slope differences according to the present invention will be described in detail below with reference to the accompanying drawings. The method is used to detect changes in land cover on Landsat images at two different times of the same location, thereby determining the range of the region where the change in land cover occurs at the location. The two different times are T1 and T2 respectively. The method includes the following steps,
[0040] Step A, connecting the spectral data of the six bands of the Landsat image at the same location into five spectral segments according to the spectrum, and calculating the slope of each spectral segment for each point of the Landsat image at ...
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The invention discloses a method for detecting land cover changes based on spectral slope differences. The method comprises the following steps of: A, connecting spectral data of six wave bands of a Landsat image of a same site into five spectral sections according to a wave spectrum, and respectively calculating the slope of each spectral section for each point location of the Landsat image at T1 time and T2 time; B, respectively calculating the slope of each wave band of each point location of the Landsat image at the T1 time and the T2 time to form a slope vector, and calculating a slope change magnitude according to the absolute distance of the slope vector; and C, determining a land cover changed region and a land cover unchanged region in the Landsat image according to a threshold set on the basis of the slope change magnitude calculation result obtained in the step B. The method for detecting the land cover changes based on the spectral slope differences solves the problem that the conventional change detection method is less prone to controlling the influence of endogenous noises during change detection.
Description
technical field [0001] The invention relates to a method for processing remote sensing images, in particular to a method for measuring land cover changes by comparing Landsat images in different periods. Background technique [0002] For a long time, in the field of remote sensing imaging, Landsat TM / ETM+ images have a large number of applications. The US Landsat has gone through three generations. The first generation is Landsat-1 satellite, Landsat-2 satellite and Landsat-3 satellite, and the second generation is Landsat-4 Satellites and Landsat-5 satellites, the third generation is Landsat-6 satellites and Landsat-7 satellites. TM refers to the multi-band scanning images obtained by the Thematic Mapper of the US Landsat 4~5 special mapper. The TM image has 7 bands, and its spectral range is: TM-1 is 0.45~0.52 microns, TM-2 is 0.52~ 0.60 microns, TM-3 is 0.63-0.69 microns, and the above is the visible light band; TM-4 is 0.76-0.90 microns, which is the near-infrared band;...
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IPC IPC(8): G06T7/00
Inventor 陈军陆苗陈利军
Owner NAT GEOMATICS CENT OF CHINA