Soil erosion data set of Altun mountain national key prevention area in 2020

English name

CSTR

CSTR:11738.11.ncdc.HHSTBC.2021.248

Share type

offline

Category

Soil and Water Conservation

Datasets description

The data set of soil erosion in the national key prevention area of Altun Mountain in 2020 includes the statistical table of soil erosion in Ruoqiang county and Qiemo County of Xinjiang Uygur Autonomous Region in 2020, which is based on the processing of satellite remote sensing image with spatial resolution of 2m. The saved format is xlsx. The data is named in the form of "key control area + year + soil erosion statistical table", such as“ ×× Key governance areas ×× Statistical table of soil erosion in 2000. Soil erosion intensity can be divided into 6 grades: Micro erosion, light erosion, moderate erosion, strong erosion, very strong erosion and severe erosion

Base information

collect time	2020/01/01 - 2020/12/31
collect place	Altun mountain national key prevention area
data size	1.1 MB
data format
Coordinate system

Data source description

The data sources of land use are ZY-3 and Gao FEN-1 satellite images, which are mainly obtained from the information center of the Ministry of water resources. 2. Vegetation data sources are ZY-3 and Gao FEN-1 satellite images, which are mainly obtained from the information center of the Ministry of water resources. 3.1:50000 DEM is mainly obtained from the information center of the Ministry of water resources.

Data processing method

Based on the thematic maps of land use, vegetation coverage and slope, the soil erosion intensity was graded by ArcGIS software. 2. The land use processing method is based on ecognition software platform, using the method of object-oriented computer automatic classification and manual visual interpretation to extract the land use data of the study area year by year. Finally, three methods are used to verify the accuracy of the data: field sample point survey, high-resolution image recognition and Google Earth sample point recognition. 3. The processing method of vegetation coverage is based on remote sensing estimation, and the normalized vegetation index (NDVI) is used to estimate the vegetation coverage by pixel dichotomy model. First, the NDVI of each pixel is calculated by using the near-infrared and red band data of multispectral images. Then, the model is used to calculate the vegetation coverage of the whole region, and the vegetation coverage is classified according to the classification rules. Finally, the land use type data obtained from remote sensing interpretation and the vegetation coverage data obtained from remote sensing estimation are used for superposition operation, The vegetation coverage information of each pixel was obtained. 4. Slope data processing method is based on 1:50000 DEM extraction.

Data quality description

Remote sensing images are preprocessed by radiation correction, orthorectification, fusion and mosaic. 2. The actual surface area corresponding to the minimum spot area is not less than 0.1 h ^, the polygons have no overlap, no gap, and the spot attributes have no vacancy or redundancy. 3. Before the remote sensing image interpretation, the remote sensing image, typical investigation and field comparison methods are used to establish the remote sensing interpretation marks of forest and grass sample plots. 4. Based on remote sensing images, combined with interpretation marks, extract land use types. 5. Review of interpretation results: no less than 5% of the total map spots shall be selected for verification. 6. The number and results of field verification samples meet the requirements of technical specification for remote sensing monitoring of soil and water conservation (sl592-2012). For verification spots, 10% are selected as verification samples for field verification.

Citations and annotations

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For the achievements published in English, please refer to the following specifications： The dataset is provided by National Cryosphere Desert Data Center. (http://www.ncdc.ac.cn).

Data reference

Monitoring Center for ecological environment of soil and water conservation in the Yellow River Basin. Soil erosion data set of Altun mountain national key prevention area in 2020. National glacial and frozen desert scientific data center(http://www.ncdc.ac.cn/), 2021.

license agreement

This work is licensed under a Creative Commons Attribution 4.0 International License.

#	Dataset title

#	title	file size
1	2020年黄河流域（片）阿尔金山国家级重点预防区土壤侵蚀图.docx	1.1 MB
2	2020年黄河流域（片）阿尔金山国家级重点预防区土壤侵蚀面积统计表.xlsx	12.0 kB

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Theme:
Water erosion
Subject:
physical geography
Time:
2020
Place:
Ruoqiang County

east

west

south

north

Service information

contacts:: Min Yufang
phone:: 0931-4967596
mailbox:: ncdc@lzb.ac.cn

Contact information

contributors:: Monitoring Center for ecological environment of soil and water conservation in the Yellow River Basin
author:: Zhao Yan
manager:: Li Suya