Evaluation of Low Cost Digital Cameras for Producing Photogrammetric Output from UAV

Abstract

Recently there a lot of improvement in digital photogrammetry and this allow photogrammetry to become faster and cheaper . This study discuss about two type of low cost camera which is the compact camera (Canon Power Shot SX230 ) and action camera (Xiaomi yi) where both of them have different lens distortion. This study is conducted within UTM (Universiti Teknologi Malaysia) Skudai campus at Kolej Tun Razak. Both of the Canon Power Shot SX230 and Xiaomi yi camera would be attach to the UAV to take aerial photo with three different altitude which is 60 meter, 80 meter and 100 meter with a similar flight path. Check point (CPs) and Ground control point (GCPs) were also established using rapid static technique of Global Positioning System (GPS) and Total Station. The Canon Power Shot SX230 and Xiaomi yi camera is then calibrated using checkboard calibration this is done by using Agisoft Lens software. Then all of the pictures that been taken by the Canon Power Shot SX230 and the Xiaomi yi would be processed by using Agisoft Photoscan software to generate Digital Elevation Model (DEM), orthophoto and contour line. The accuracy of DEM was determined based on Root Mean Squared Error (RMSE) value. Both of the result is then analyze visually and statically. Overall both of the camera gives a slight different in accuracy.

NDVI Identification and Survey of a Roman Road in the Northern Spanish Province of Álava

“…The development of photogrammetry softwares, which are able to process pictures taken with general purpose cameras, has brought about a revolution in archaeological recording, which in conjunction with the appearance of UAVs (which can accurately follow pre-programed missions), has allowed archaeologists to produce accurate surveys and 3D models easily and quickly [11][12][13]. The high sensitivity of digital cameras to near infrared wavelengths makes them perfect for recording this part of the light spectrum [14][15][16][17]. The general development of Geographic Information System (GIS) allows the management of geographic information from old and new maps, aerial photographs, site surveys, orthomosaics, etc., making them easy to work with, and an invaluable tool in heritage protection and management [18].…”