Optimization of Rocky Desertification Classification Model Based on Vegetation Type and Seasonal Characteristic
Building a high-precision, stable, and universal automatic extraction model of the rocky desertification information is the premise for exploring the spatiotemporal evolution of rocky desertification. Taking Guizhou province as the research area and based on MODIS and continuous forest inventory dat...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-07-01
|
| Series: | Remote Sensing |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2072-4292/13/15/2935 |
| _version_ | 1827686390745268224 |
|---|---|
| author | Chunhua Qian Hequn Qiang Feng Wang Mingyang Li |
| author_facet | Chunhua Qian Hequn Qiang Feng Wang Mingyang Li |
| author_sort | Chunhua Qian |
| collection | DOAJ |
| description | Building a high-precision, stable, and universal automatic extraction model of the rocky desertification information is the premise for exploring the spatiotemporal evolution of rocky desertification. Taking Guizhou province as the research area and based on MODIS and continuous forest inventory data in China, we used a machine learning algorithm to build a rocky desertification model with bedrock exposure rate, temperature difference, humidity, and other characteristic factors and considered improving the model accuracy from the spatial and temporal dimensions. The results showed the following: (1) The supervised classification method was used to build a rocky desertification model, and the logical model, RF model, and SVM model were constructed separately. The accuracies of the models were 73.8%, 78.2%, and 80.6%, respectively, and the kappa coefficients were 0.61, 0.672, and 0.707, respectively. SVM performed the best. (2) Vegetation types and vegetation seasonal phases are closely related to rocky desertification. After combining them, the model accuracy and kappa coefficient improved to 91.1% and 0.861. (3) The spatial distribution characteristics of rocky desertification in Guizhou are obvious, showing a pattern of being heavy in the west, light in the east, heavy in the south, and light in the north. Rocky desertification has continuously increased from 2001 to 2019. In conclusion, combining the vertical spatial structure of vegetation and the differences in seasonal phase is an effective method to improve the modeling accuracy of rocky desertification, and the SVM model has the highest rocky desertification classification accuracy. The research results provide data support for exploring the spatiotemporal evolution pattern of rocky desertification in Guizhou. |
| first_indexed | 2024-03-10T09:10:32Z |
| format | Article |
| id | doaj.art-d15ebdbd191e4b5391f5814f584d9c0c |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T09:10:32Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-d15ebdbd191e4b5391f5814f584d9c0c2023-11-22T06:06:24ZengMDPI AGRemote Sensing2072-42922021-07-011315293510.3390/rs13152935Optimization of Rocky Desertification Classification Model Based on Vegetation Type and Seasonal CharacteristicChunhua Qian0Hequn Qiang1Feng Wang2Mingyang Li3School of Forestry, Nanjing Forestry University, Nanjing 210037, ChinaSchool of Smart Agricultural, Suzhou Polytechnic Institute of Agriculture, Suzhou 215008, ChinaSchool of Smart Agricultural, Suzhou Polytechnic Institute of Agriculture, Suzhou 215008, ChinaSchool of Forestry, Nanjing Forestry University, Nanjing 210037, ChinaBuilding a high-precision, stable, and universal automatic extraction model of the rocky desertification information is the premise for exploring the spatiotemporal evolution of rocky desertification. Taking Guizhou province as the research area and based on MODIS and continuous forest inventory data in China, we used a machine learning algorithm to build a rocky desertification model with bedrock exposure rate, temperature difference, humidity, and other characteristic factors and considered improving the model accuracy from the spatial and temporal dimensions. The results showed the following: (1) The supervised classification method was used to build a rocky desertification model, and the logical model, RF model, and SVM model were constructed separately. The accuracies of the models were 73.8%, 78.2%, and 80.6%, respectively, and the kappa coefficients were 0.61, 0.672, and 0.707, respectively. SVM performed the best. (2) Vegetation types and vegetation seasonal phases are closely related to rocky desertification. After combining them, the model accuracy and kappa coefficient improved to 91.1% and 0.861. (3) The spatial distribution characteristics of rocky desertification in Guizhou are obvious, showing a pattern of being heavy in the west, light in the east, heavy in the south, and light in the north. Rocky desertification has continuously increased from 2001 to 2019. In conclusion, combining the vertical spatial structure of vegetation and the differences in seasonal phase is an effective method to improve the modeling accuracy of rocky desertification, and the SVM model has the highest rocky desertification classification accuracy. The research results provide data support for exploring the spatiotemporal evolution pattern of rocky desertification in Guizhou.https://www.mdpi.com/2072-4292/13/15/2935rocky desertificationsupervised classification methodMODIS datafeature extractionspatial and temporal distribution |
| spellingShingle | Chunhua Qian Hequn Qiang Feng Wang Mingyang Li Optimization of Rocky Desertification Classification Model Based on Vegetation Type and Seasonal Characteristic Remote Sensing rocky desertification supervised classification method MODIS data feature extraction spatial and temporal distribution |
| title | Optimization of Rocky Desertification Classification Model Based on Vegetation Type and Seasonal Characteristic |
| title_full | Optimization of Rocky Desertification Classification Model Based on Vegetation Type and Seasonal Characteristic |
| title_fullStr | Optimization of Rocky Desertification Classification Model Based on Vegetation Type and Seasonal Characteristic |
| title_full_unstemmed | Optimization of Rocky Desertification Classification Model Based on Vegetation Type and Seasonal Characteristic |
| title_short | Optimization of Rocky Desertification Classification Model Based on Vegetation Type and Seasonal Characteristic |
| title_sort | optimization of rocky desertification classification model based on vegetation type and seasonal characteristic |
| topic | rocky desertification supervised classification method MODIS data feature extraction spatial and temporal distribution |
| url | https://www.mdpi.com/2072-4292/13/15/2935 |
| work_keys_str_mv | AT chunhuaqian optimizationofrockydesertificationclassificationmodelbasedonvegetationtypeandseasonalcharacteristic AT hequnqiang optimizationofrockydesertificationclassificationmodelbasedonvegetationtypeandseasonalcharacteristic AT fengwang optimizationofrockydesertificationclassificationmodelbasedonvegetationtypeandseasonalcharacteristic AT mingyangli optimizationofrockydesertificationclassificationmodelbasedonvegetationtypeandseasonalcharacteristic |