Exploring the Use of Google Earth Imagery and Object-Based Methods in Land Use/Cover Mapping

Remote Sensing

Qiong Hu¹  Wenbin Wu¹  Tian Xia¹  Qiangyi Yu¹  Peng Yang¹  Zhengguo Li¹ 

[1] Key Laboratory of Agri-informatics, Ministry of Agriculture, Beijing 100081, China; E-Mails:

关键词: Google Earth;    QuickBird;    land use/cover;    object-based;    classification;   

DOI  :  10.3390/rs5116026

来源: mdpi

【 摘 要 】

Google Earth (GE) releases free images in high spatial resolution that may provide some potential for regional land use/cover mapping, especially for those regions with high heterogeneous landscapes. In order to test such practicability, the GE imagery was selected for a case study in Wuhan City to perform an object-based land use/cover classification. The classification accuracy was assessed by using 570 validation points generated by a random sampling scheme and compared with a parallel classification of QuickBird (QB) imagery based on an object-based classification method. The results showed that GE has an overall classification accuracy of 78.07%, which is slightly lower than that of QB. No significant difference was found between these two classification results by the adoption of Z-test, which strongly proved the potentials of GE in land use/cover mapping. Moreover, GE has different discriminating capacity for specific land use/cover types. It possesses some advantages for mapping those types with good spatial characteristics in terms of geometric, shape and context. The object-based method is recommended for imagery classification when using GE imagery for mapping land use/cover. However, GE has some limitations for those types classified by using only spectral characteristics largely due to its poor spectral characteristics.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland