2007
DOI: 10.14358/pers.73.2.133
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Geometric Correction and Digital Elevation Extraction Using Multiple MTI Datasets

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“…where h is the ground vertical extent, d is the footprint diameter, η is the estimated terrain slope, θ is the intersection angle between the terrain aspect and footprint orientation, and a and b are the semi-major and semi-minor axes of each footprint, respectively. The four threshold values of the intersection angle used for choosing the estimation method can be calculated by Equations (8)- (11). The left and right sides of each equation represented the theoretical absolute errors by two methods of the left and right sides of the threshold value in Figure 2, respectively.…”
Section: Terrain Slope Estimation Methodsmentioning
confidence: 99%
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“…where h is the ground vertical extent, d is the footprint diameter, η is the estimated terrain slope, θ is the intersection angle between the terrain aspect and footprint orientation, and a and b are the semi-major and semi-minor axes of each footprint, respectively. The four threshold values of the intersection angle used for choosing the estimation method can be calculated by Equations (8)- (11). The left and right sides of each equation represented the theoretical absolute errors by two methods of the left and right sides of the threshold value in Figure 2, respectively.…”
Section: Terrain Slope Estimation Methodsmentioning
confidence: 99%
“…Hence, we obtained the intersection angle as the difference of the terrain aspect from ASTER GDEM2 and the footprint orientation from GLAS data. Afterward, four threshold values were calculated by substituting the footprint major axis, minor axis, and ground extent into Equations (8)- (11). The optimal footprint diameter was determined by comparing the intersection angle with four threshold angles.…”
Section: Choice Of Footprint Diametermentioning
confidence: 99%
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