Table 3 The standard deviation ellipse parameter of China’s food security level.
From: Regional differences, spatial temporal evolution and dynamic evolution of food security in China
Year | Elliptical perimeter | Elliptical area | Elliptical center point | Elliptical angle | |
|---|---|---|---|---|---|
longitude | latitude | ||||
2011 | 71.957 | 383.858 | 113.478 | 34.799 | 65.320 |
2012 | 73.052 | 395.662 | 113.385 | 34.877 | 66.700 |
2013 | 72.078 | 388.548 | 113.117 | 34.648 | 69.740 |
2014 | 73.661 | 402.300 | 113.435 | 35.033 | 66.800 |
2015 | 73.038 | 398.579 | 113.162 | 34.796 | 69.480 |
2016 | 73.025 | 397.814 | 113.094 | 34.713 | 69.370 |
2017 | 73.783 | 404.552 | 113.317 | 34.944 | 67.030 |
2018 | 73.691 | 403.547 | 113.248 | 34.863 | 67.320 |
2019 | 73.537 | 403.126 | 113.002 | 34.684 | 68.780 |
2020 | 73.603 | 404.155 | 113.056 | 34.751 | 68.430 |
2021 | 73.766 | 406.441 | 112.916 | 34.759 | 69.300 |
