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| 耕地“非粮化”遥感提取研究——以唐山丰南区为例 |
| Remote sensing extraction of cultivated land "non-grain"：a case study of Fengnan District，Tangshan City |
| 投稿时间：2024-10-30 |
| DOI：10.13254/j.jare.2024.0856 |
| 中文关键词: 耕地“非粮化”，GEE，物候特征，农作物时间序列检测器，丰南区 |
| 英文关键词: farmland "non-grain", GEE, phenological characteristic, crop time series detector, Fengnan District |
| 基金项目:国家自然科学基金面上项目（42071249）；河北省教育厅人文社会科学研究重大课题攻关项目（ZD202207） |
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| 中文摘要: |
| 为提高耕地“非粮化”图斑的提取效率和准确度，本研究以唐山市丰南区为例，基于谷歌地球引擎（GEE）平台，利用2019—2022 年耕地数据，结合农作物数据集、农作物物候特征和农作物时间序列检测器等获取农作物样本点，通过 Sentinel-2 和Sentinel-1长时序遥感数据构建农作物分类特征集，采用随机森林算法进行农作物分类后提取非粮作物图斑。结果表明：在进行农作物分类时，通过分析不同种类农作物NDVI和MNDWI时间序列差异，验证随机样本点，提取用于分类的样本集，最终得到了精度较高的农作物分类结果。研究期间农作物分类结果的总体精度均大于91%，Kappa系数均大于0.87，各年提取得到的非粮作物面积与统计数据的相对误差均小于1.5%，非粮作物提取精度较高。2019—2022年，丰南区西部乡镇非粮作物种植较多，且占比较高。研究方法对于无法获取实地样本点的历史年份，在提取非粮作物的种植范围时有较好适用性，且提取精度较高，可为耕地“非粮化”监管提供方法参考。 |
| 英文摘要: |
| In order to improve the extraction efficiency and accuracy of "non-grain" map spots of cultivated land, Fengnan District of Tangshan City was taken as an example. Based on Google Earth Engine（GEE）platform, cultivated land data, crop data sets, crop phenological characteristics of 2019-2022 and crop time series detector were used to collect crop sample points. Sentinel-2 and Sentinel-1 long time series remote sensing data were used to construct crop classification feature set, and random forest algorithm was used to classify crops and extract non-grain crop spots. The research findings were as follows：in crop classification, by analyzing the difference of NDVI and MNDWI time series of different types of crops, verifying random sample points, extracting sample sets for classification, we finally obtained crop classification results with high precision. During the study period, the overall accuracy of crop classification results was greater than 91%, Kappa coefficient was greater than 0.87, and the relative error between the extracted non-grain crop area and statistical data in each year was less than 1.5%, indicating high extraction accuracy of non-grain crops. During the study period, non-grain crops were widely planted in western towns of Fengnan District and accounted for a relatively high proportion. For the historical years in which field sample points cannot be obtained, the research method has good applicability in extracting the planting range of non-grain crops, and the extraction accuracy is high, which can provide method reference for the supervision of cultivated land "non-grain". |
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