TY - JOUR A1 - Lo, C. F. A1 - Tsai, M. L. A1 - Chiang, K. W. A1 - Chu, C. H. A1 - Tsai, G. J. A1 - Cheng, C. K. A1 - El-Sheimy, N. A1 - Ayman, H. T1 - THE DIRECT GEOREFERENCING APPLICATION AND PERFORMANCE ANALYSIS OF UAV HELICOPTER IN GCP-FREE AREA JO - Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci. J1 - ISPRS-Archives VL - XL-1/W4 SP - 151 EP - 157 Y1 - 2015/08/26 PB - Copernicus Publications SN - 2194-9034 UR - https://isprs-archives.copernicus.org/articles/XL-1-W4/151/2015/ L1 - https://isprs-archives.copernicus.org/articles/XL-1-W4/151/2015/isprsarchives-XL-1-W4-151-2015.pdf DO - 10.5194/isprsarchives-XL-1-W4-151-2015 ER -