Table 5 Changes in standard deviation ellipse and centroid parameters of ESV in the study area.

From: Spatio-temporal distribution characteristics and driving factors of forest land in the Da-Xiao Liangshan mountains based on topographic gradient

Year

Standard deviation ellipse

Center of gravity

Azimuth angle /°

Major axis /km

Minor axis /km

Oblateness

Longitude (E)/°

Latitude (N)/°

1980

50.781

150.975

110.792

1.363

101.856

27.766

1990

50.749

150.921

110.868

1.361

101.857

27.767

2000

50.760

150.887

110.877

1.361

101.857

27.766

2010

50.752

150.788

110.459

1.365

101.862

27.771

2020

50.774

150.812

110.465

1.365

101.862

27.771

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