Vegetation Coverage Prediction for the Qinling Mountains Using the CA–Markov Model
Abstract
:1. Introduction
2. Materials and Methods
2.1. Research Area
2.2. Data Source
2.3. Data Processing
3. Methods
3.1. Calculation of Vegetation Coverage Degree
3.2. Classification of Vegetation Coverage Degree
3.3. Kappa Coefficient
3.4. Prediction of Vegetation Coverage Degree
- (1)
- The transition area between various vegetation coverage levels from 2008 to 2010 is used as the element of the Markov state transition probability matrix. Based on the probability transition matrix, the vegetation coverage grades in 2013 were predicted.
- (2)
- The 5 × 5 cell matrixes around each cell were used as the neighbor cells to form a 5 × 5 filter.
- (3)
- The Pearson test and the kappa accuracy test were performed on the predicted landscape types and the actual landscape types in 2013.
- (4)
- Based on the probability matrix of area transition from 2010 to 2013 and the actual vegetation coverage level in 2013, the grades of vegetation coverage in 2025 were predicated.
4. Results
4.1. Comparison of Three NDVI
4.2. Grading and Prediction of Vegetation Coverage Using MODIS NDVI
4.2.1. Grading of Vegetation Coverage Degree for MODIS NDVI
4.2.2. Prediction on Vegetation Coverage Using MODIS NDVI
4.3. Grading and Prediction of Vegetation Coverage Using SPOT NDVI
4.3.1. Grading of Vegetation Coverage Degree for SPOT NDVI
4.3.2. Prediction on Vegetation Using SPOT NDVI
5. Discussion
6. Conclusion
- (1)
- The correlation coefficients of GIMMS NDVI, SPOT NDVI, and MODIS NDVI between the values from April to September and the annual average value were calculated. Compared with GIMMS NDVI, the correlation coefficients of SPOT NDVI and MODIS NDVI in July, August, and September were greater than 80%. SPOT NDVI and MODIS NDVI were used for vegetation coverage grading.
- (2)
- SPOT NDVI and MODIS NDVI were used to grade the vegetation coverage in the Qinling Mountains. Furthermore, the two grading results were consistent. The results showed that the high vegetation coverage in the Qinling Mountains was more than 50% in area. The proportions of low vegetation coverage, middle vegetation coverage, and middle–high vegetation coverage were all above 10%. The proportion of middle–low vegetation coverage was less than 10%.
- (3)
- In the spatial scale, the vegetation coverage around urban built-up areas that are distributed in a stripe along the mountains is at the lowest level. In addition, the vegetation coverage in the southeast of the Qinling Mountains is dominated by mixed farmland and agroforestry vegetation. However, the vegetation coverage in the transition area between the urban built-up area and the mixed vegetation area in the southeast is relatively low, forming a transition zone. The vegetation coverage on the southern slope of the Qinling Mountains is relatively high, which is covered by temperate coniferous and broad-leaved mixed forests, subtropical deciduous broad-leaved forests, and evergreen broad-leaved mixed forests. In the time scale, the area ratio of vegetation coverage grade does not change much between years, which has a trend of conversion from low vegetation coverage to low–medium vegetation coverage. For MODIS NDVI, the low vegetation cover grade and the high vegetation cover grade decreases, while the middle vegetation cover grade and the middle–high vegetation cover grade increases.
- (4)
- The vegetation coverage maps of the Qinling Mountains in 2008 and 2010 were calculated by SPOT NDVI and MODIS NDVI. Based on the CA–Markov model, the predicted vegetation coverage of the Qinling Mountains in 2013 was simulated. By comparing with the actual vegetation coverage in 2013, the Pearson index and the kappa coefficient showed that the simulation result is reliable.
- (5)
- Based on the CA–Markov model, the predicted vegetation coverage of the Qinling Mountains in 2025 was simulated using the vegetation coverage maps in 2008, 2010, and 2013. The prediction results shows that the low vegetation coverage transits to middle–low vegetation coverage. The proportion of middle and middle–high vegetation coverage increases. The high vegetation coverage is stable.
- (6)
- The growth and distribution of vegetation are affected by many factors. The influence of atmospheric conditions and other environmental factors on the NDVI value is not considered in this study, and can therefore be further discussed in the future research process.
- (7)
- The data selected in this paper are from 2008, 2010, and 2013. The interval and span of time are small. Although the research results can show a certain trend of change, a longer time scale should be selected to achieve more obvious research effects in further work.
- (8)
- The resolution of remote sensing images is a key feature to affect the accuracy of prediction. Higher-resolution remote sensing images should be used in future research. The smaller the cellular scale, the higher the accuracy of the prediction results in quantity and space.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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No. | The Grade of the Vegetation Coverage | The Coverage of Vegetation | Landscape |
---|---|---|---|
1 | Low vegetation coverage | <15% | Habitat, water, bare, traffic, grass |
2 | Middle and low vegetation coverage | 15%–40% | Grass, woodland, farmland, sparse wood |
3 | Middle vegetation coverage | 40%–60% | Grass, woodland, other wood, farmland |
4 | Middle and high vegetation coverage | 60%–75% | Shrub, forest |
5 | High vegetation coverage | >75% | Shrub, forest |
Satellite | Sensor | Bandwidth | Spatial Resolution | Temporal Resolution | |
---|---|---|---|---|---|
GIMMS NDVI | NOAA-16 NOAA-17 NOAA-18 | AVHRR | RED: 0.585–0.680 μm NIR: 0.730–0.980 μm | 8 km | 15 days |
MODIS NDVI | TERRA | MODIS | RED: 0.620–0.670 μm NIR: 0.841–0.876 μm | 250 m | 1 month |
SPOT-VGT NDVI | SPOT-4 SPOT-5 | VEGETATION | RED: 0.61–0.68 μm NIR: 0.79–0.89 μm | 1 km | 10 days |
Month | GIMMS | SPOT | MODIS |
---|---|---|---|
4 | 0.29 | 0.43 | 0.60 |
5 | 0.44 | 0.79 | 0.66 |
6 | 0.32 | 0.43 | 0.79 |
7 | 0.28 | 0.87 | 0.93 |
8 | 0.82 | 0.90 | 0.94 |
9 | 0.33 | 0.93 | 0.80 |
Grade of Vegetation Coverage | 2008 | 2010 | 2013 | 2025 | ||||
---|---|---|---|---|---|---|---|---|
Area (km2) | Proportion (%) | Area (km2) | Proportion (%) | Area (km2) | Proportion (%) | Area (km2) | Proportion (%) | |
Low | 6490.94 | 11.73 | 6323.19 | 11.43 | 6138.31 | 11.10 | 1263.94 | 2.28 |
Middle and Low | 4102.25 | 7.42 | 4141.31 | 7.49 | 3892.06 | 7.04 | 7918.25 | 14.31 |
Middle | 5844.94 | 10.57 | 6413.44 | 11.59 | 6266.94 | 11.33 | 6745.80 | 12.19 |
Middle and High | 6937.50 | 12.54 | 7993.81 | 14.45 | 8071.81 | 14.59 | 11,239.21 | 20.32 |
High | 31,946.75 | 57.75 | 30,450.63 | 55.04 | 30,953.25 | 55.95 | 28,155.17 | 50.89 |
Grade of Vegetation Coverage | 2008 | 2010 | 2013 | 2025 | ||||
---|---|---|---|---|---|---|---|---|
Area (km2) | Proportion (%) | Area (km2) | Proportion (%) | Area (km2) | Proportion (%) | Area (km2) | Proportion (%) | |
Low | 6806.70 | 12.29 | 6181.78 | 11.17 | 5815.54 | 10.50 | 2173.64 | 3.93 |
Middle and Low | 4380.13 | 7.91 | 3612.34 | 6.52 | 3273.19 | 5.91 | 5442.73 | 9.83 |
Middle | 7508.80 | 13.56 | 6050.40 | 10.93 | 6055.32 | 10.94 | 7196.75 | 13.00 |
Middle and High | 10,042.94 | 18.14 | 8277.42 | 14.95 | 9210.27 | 16.64 | 11,865.94 | 21.43 |
High | 26,627.33 | 48.09 | 31,243.96 | 56.43 | 31,011.57 | 56.01 | 28,686.83 | 51.81 |
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Cui, L.; Zhao, Y.; Liu, J.; Wang, H.; Han, L.; Li, J.; Sun, Z. Vegetation Coverage Prediction for the Qinling Mountains Using the CA–Markov Model. ISPRS Int. J. Geo-Inf. 2021, 10, 679. https://doi.org/10.3390/ijgi10100679
Cui L, Zhao Y, Liu J, Wang H, Han L, Li J, Sun Z. Vegetation Coverage Prediction for the Qinling Mountains Using the CA–Markov Model. ISPRS International Journal of Geo-Information. 2021; 10(10):679. https://doi.org/10.3390/ijgi10100679
Chicago/Turabian StyleCui, Lu, Yonghua Zhao, Jianchao Liu, Huanyuan Wang, Ling Han, Juan Li, and Zenghui Sun. 2021. "Vegetation Coverage Prediction for the Qinling Mountains Using the CA–Markov Model" ISPRS International Journal of Geo-Information 10, no. 10: 679. https://doi.org/10.3390/ijgi10100679