The Qinghai-Xizang Plateau contains the most typical and diverse types of alpine wetlands.In order to explore the degradation of alpine wetlands, it is necessary to extract accurate information of alpine wetlands.Research methods Selects growing season images of GF1-WFV in Maduo County and uses hierarchical classification method.Chose the 50-segmentation scale to segment the image, and then the wetlands are identified by means of single band threshold and slope threshold.Comprehensive uses of these methods, including spectral relation method, mixed water index method, normalized differential water index method and single band threshold method.Finally, the information and distribution status of the alpine wetland types in Maduo County, Qinghai Province were obtained, combines with non-growing season images, according to the class III classification standard of alpine wetland remote sensing classification system.Research results Firstly, the sample points were randomly selected and the accuracy of the image was evaluated by the method of confusion matrix.The classification accuracy of this study reaches 88.59%, and the Kappa coefficient is 0.8637, the classification accuracy passes the test.The classification results show that the hierarchical classification technique combining image texture features and spectral features is superior to other traditional methods in the extraction of alpine wetland information, and it is able to achieve Information extraction and analysis of alpine wetland refinement.Secondly, the area of alpine wetland in Maduo County is more in the east than in the west, more in the north and less in the south, and the main types of wetlands are concentrated in the central and northern regions.The largest area of the permanent freshwater lake is 1685.58 km2, accounting for 69.05% of the total alpine wetland area of Maduo County, followed by herbaceous swamps and permanent rivers/streams, with an area of 495.56 km2 and 94.81 km2, accounting for 20.34% and 3.88%, respectively.The wetland area of seasonal saltwater lakes, seasonal freshwater lakes, intermittent rivers/streams, flooded wetlands, mud marshes, scrub swamps, inland salt marshes and glacial snow cover wetlands is within 1.25~73.23 km2, accounting for less than 1%, of which seasonal saltwater lakes and seasonal freshwater lakes are the smallest.Thirdly, the high-score data is not affected by the high-altitude resolution in the information extraction of alpine wetland in Qinghai-Xizang Plateau, so it has more feasibility and application, especially choosing the image of growth season and non-growth season with different time resolution, which has more advantages in obtaining seasonal alpine wetland type information.Lastly, the classification result shows that among the types of alpine wetlands in Maduo County, the area of lakes tends to increase, but the area of rivers and flooded wetlands tends to decrease.If protective measures are not taken timely and effectively, the wetlands in Maduo County may continue to degrade.
Shuaiqi ZHANG
,
Bingrong ZHOU
,
Feifei SHI
,
Qi CHEN
,
Shulan SU
. Study on Information Extraction Method of Alpine Wetland in Qinghai- Xizang Plateau based on Remote Sensing Data of GF-1 Satellite[J]. Plateau Meteorology, 2020
, 39(6)
: 1309
-1317
.
DOI: 10.7522/j.issn.1000-0534.2019.00131
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