Automated tree-crown and height detection in a young forest plantation using mask region-based convolutional neural network (Mask R-CNN)使用基于掩模区域的卷积神经网络 (mask r-cnn) 在年轻的人工林中自动检测树冠和高度ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSINGIF12.22021-08-01114PREAI