Warning: file_put_contents(/www/wwwroot/ppbbu/80125.cn/cache/c55ec47252cdfea6e9b58ff43f47b267.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/80125.cn/index.php on line 58 thematic classification map例句_thematic classification map英汉例句_thematic classification map双解例句_食材铺反向词典
Based on the previous research of classification, stratified two-stage sampling is introduced into the accuracy assessment of thematic map. 在以上分类研究的基础上，引入分层二阶随机抽样方法改善专题图的精度评价效果。