For rooftop structures only with either of the two conditions, auxiliary measurement and manually interpretation are used to make sure whether they are illegal.
For rooftop structures only with either of the two conditions, auxiliary measurement and manually interpretation are used to make sure whether they are illegal.
若建物仅符合其一条件，则辅以图象相对高度测量与人工判释，抽取其高度信息并比对建物使用许可高度，藉此判断是否有屋顶加盖物的发生。