A Regionalized Study on the Spatial-Temporal Changes of Grassland Cover in the Three-River Headwaters Region from 2000 to 2016
Abstract
:1. Introduction
2. Study Area and Materials
2.1. Study Area
2.2. Data Source and Preprocessing
3. Methods
3.1. Area Division Process
3.2. Tabulate Area Method
3.3. Machine Learning Methods
4. Results
4.1. Overall Characteristics of the TRHR
4.2. Area with Significantly NTV Decrease
4.3. Areas with High NTVV Standard Deviation
4.4. Machine Learning Results Evaluation
4.5. Evaluation of Machine Learning Results without AD and TA Methods
4.6. Evaluation of Machine Learning Results without TA Method
5. Discussion
6. Conclusions
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Class | DEM (m) | TEM (°C) | PRE (mm) |
---|---|---|---|
A | <4400 | <−3.31 | <476.88 |
B | ≥4400 & <4900 | ≥−3.31 | ≥476.88 |
C | ≥4900 |
Study Areas * | Code Combination Definitions | ||
---|---|---|---|
1st Letter: DEM (m) | 2nd Letter: TEM (°C) | 3rd Letter: PRE (mm) | |
AAA | <4400 | <−3.31 | <476.88 |
AAB | <4400 | <−3.31 | ≥476.88 |
ABA | <4400 | ≥−3.31 | <476.88 |
ABB | <4400 | ≥−3.31 | ≥476.88 |
BAA | ≥4400 & <4900 | <−3.31 | <476.88 |
BAB | ≥4400 & <4900 | <−3.31 | ≥476.88 |
BBA | ≥4400 & <4900 | ≥−3.31 | <476.88 |
BBB | ≥4400 & <4900 | ≥−3.31 | ≥476.88 |
CAA | ≥4900 | <−3.31 | <476.88 |
CAB | ≥4900 | <−3.31 | ≥476.88 |
CBA | ≥4900 | ≥−3.31 | <476.88 |
CBB | ≥4900 | ≥−3.31 | ≥476.88 |
Study Areas | Area (km2) | NTVV (%) | Standard Deviation (%) |
---|---|---|---|
AAA | 7712 | −0.96 | 8.86 |
AAB | 4944 | −1.98 | 13.63 |
ABA | 19,551 | 2.34 | 10.71 |
ABB | 54,386 | 2.54 | 11.34 |
BAA | 70,579 | 0.82 | 9.24 |
BAB | 25,855 | 0.78 | 14.61 |
BBA | 34,092 | 0.66 | 9.7 |
BBB | 47,224 | 1.18 | 14.98 |
CAA | 48,276 | −0.15 | 5.19 |
CAB | 12,577 | −0.33 | 10.98 |
CBA | 1016 | 1.31 | 7.91 |
CBB | 8930 | −0.74 | 13.36 |
Study Areas | ML Method | R2 | RMSE (%) | MAE (%) |
---|---|---|---|---|
AAB | CART | 0.189 | 3.093 | 2.396 |
RF | 0.185 | 3.109 | 2.413 | |
BAYE | 0.000 | 2.189 | 1.813 | |
SVM | 0.425 | 1.947 | 1.574 | |
BAB(I) | CART | 0.809 | 3.878 | 3.083 |
RF | 0.808 | 3.890 | 3.094 | |
BAYE | 0.767 | 3.998 | 3.155 | |
SVM | 0.852 | 3.238 | 2.509 | |
BAB(II) | CART | 0.576 | 4.350 | 3.386 |
RF | 0.578 | 4.337 | 3.388 | |
BAYE | 0.721 | 2.976 | 2.276 | |
SVM | 0.781 | 4.672 | 4.128 | |
BAB(III) | CART | 0.940 | 0.949 | 0.595 |
RF | 0.942 | 0.928 | 0.598 | |
BAYE | 0.569 | 2.394 | 1.909 | |
SVM | 0.830 | 4.317 | 3.580 | |
BBB(I) | CART | 0.481 | 4.066 | 3.162 |
RF | 0.482 | 4.034 | 3.148 | |
BAYE | 0.032 | 4.368 | 3.409 | |
SVM | 0.785 | 2.504 | 2.076 | |
BBB(II) | CART | 0.728 | 1.846 | 1.462 |
RF | 0.727 | 1.856 | 1.465 | |
BAYE | 0.749 | 1.631 | 1.240 | |
SVM | 0.885 | 2.597 | 2.197 | |
BBB(III) | CART | 0.225 | 0.951 | 0.448 |
RF | 0.230 | 0.949 | 0.440 | |
BAYE | 0.302 | 0.692 | 0.458 | |
SVM | 0.070 | 2.469 | 2.366 | |
CAB | CART | 0.940 | 0.592 | 0.395 |
RF | 0.941 | 0.593 | 0.399 | |
BAYE | 0.852 | 0.903 | 0.784 | |
SVM | 0.849 | 1.280 | 1.116 | |
CBB | CART | 0.947 | 0.815 | 0.618 |
RF | 0.949 | 0.796 | 0.594 | |
BAYE | 0.949 | 0.821 | 0.707 | |
SVM | 0.969 | 1.347 | 1.161 |
Study Areas | W/WO TA Method | R2 | RMSE (%) | MAE (%) |
---|---|---|---|---|
AAB | W | 0.185 | 3.109 | 2.413 |
WO | 0.011 | 24.018 | 17.527 | |
BAB(I) | W | 0.808 | 3.890 | 3.094 |
WO | 0.075 | 23.858 | 18.076 | |
BAB(II) | W | 0.578 | 4.337 | 3.388 |
WO | 0.015 | 29.650 | 22.676 | |
BAB(III) | W | 0.942 | 0.928 | 0.598 |
WO | 0.013 | 27.222 | 20.774 | |
BBB(I) | W | 0.482 | 4.034 | 3.148 |
WO | 0.018 | 26.235 | 20.001 | |
BBB(II) | W | 0.727 | 1.856 | 1.465 |
WO | 0.008 | 25.233 | 19.003 | |
BBB(III) | W | 0.230 | 0.949 | 0.440 |
WO | 0.000 | 30.145 | 22.545 | |
CAB | W | 0.941 | 0.593 | 0.399 |
WO | 0.008 | 23.092 | 17.323 | |
CBB | W | 0.949 | 0.796 | 0.594 |
WO | 0.036 | 24.847 | 19.044 |
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Liu, N.; Yang, Y.; Yao, L.; Yue, X. A Regionalized Study on the Spatial-Temporal Changes of Grassland Cover in the Three-River Headwaters Region from 2000 to 2016. Sustainability 2018, 10, 3539. https://doi.org/10.3390/su10103539
Liu N, Yang Y, Yao L, Yue X. A Regionalized Study on the Spatial-Temporal Changes of Grassland Cover in the Three-River Headwaters Region from 2000 to 2016. Sustainability. 2018; 10(10):3539. https://doi.org/10.3390/su10103539
Chicago/Turabian StyleLiu, Naijing, Yaping Yang, Ling Yao, and Xiafang Yue. 2018. "A Regionalized Study on the Spatial-Temporal Changes of Grassland Cover in the Three-River Headwaters Region from 2000 to 2016" Sustainability 10, no. 10: 3539. https://doi.org/10.3390/su10103539