visual estimation meaning in Chinese

目测
目估
外观评定

This method has four parts : data acquisition , image processing , pixel number extraction and coverage calculation . , based on the precision assessment , the error is very small , and it has advantages such as objectivity , consistency and high precision , compared with visual estimation methods
精度评价表明，该方法测定的绿色植被盖度误差很小，与目视估测方法比较，它具有客观、一致和精度高的优点。