Optimization for ground control points distribution with influence of surface variance in height : case study for Chiangmai Province, Thailand with very high and moderate resolution satellite imagery | |
| Author | Sudniran Phetcharat |
| Call Number | AIT Diss. no.RS-14-02 |
| Subject(s) | Ground controlled approach--Thailand --Chiangmai Remote-sensing images --Thailand--Chiangmai |
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Engineering in Remote Sensing and Geographic Information Systems |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. RS-14-02 |
| Abstract | The process of geometric correction of a satellite image requires a network of ground control points (GCPs), the density of which depends on the accuracy required. In this study, a novel approach to determining the distributions of the GCPs were uniformly distributed with area separated method and quadtree method. Comparative statistics were investigated to summarize the optimum number and distribution of the GCPs. For first proposed method, added 20% of GCPs in height variance in height area result to improve the accuracy 12%. However, there is no significant when GCPs added to low variance in height area. For second proposed method, using the principles of quadtree can be applied to determine the control point quickly by the level of quadtree, there will be more in areas of high variance in height and low level of quadtree in areas with low variance in height. Alternative GCPs selection is required to support quadtree method and radius ratio is also show maximum distant allowable for alternative GCP. Radius ratio analysis showed that the positions of the replacement should not be greater than 0.55. Moreover, THEOS Thailand satellite image is to be applied for validation and result show the same with WorldView-1 satellite image. Our results suggest that considers the variance in height of the surface could be applied to various types of images, such as satellite or aerial photography. |
| Year | 2014 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. RS-14-02 |
| Type | Dissertation |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Remote Sensing (RS) |
| Chairperson(s) | Nagai, Masahiko |
| Examination Committee(s) | Raravudh Tipdecho ;Sarawut Ninsawat |
| Scholarship Donor(s) | rinakharinwirot University, Thailand ;Royal Thai Government Fellowship, Thailand |
| Degree | Thesis (Ph. D.) - Asian Institute of Technology, 2014 |