Ortho aerial photographs, GIS data layers and Google Earth Images were used as the main sources of data input for the updating procedure as shown in Table 1. In addition, Google Street View was used mainly for identifying building types, number of storeys and characteristics of buildings during the administration of this project. It is noted that most of input data was provided by DPT, Chiang Mai offi ce. Data preparation was mainly conducted by changing the format of GIS layers from the original format to the shape fi le format which is compatible with the GIS environment. Figure 3 represents some built-up areas, mainly housing estates, and road networks in a portion of the Ortho aerial photo, taken in 2013 in the studied area