Abstract

Abstract. In this paper,the aforementioned three major aspects related to the Unmanned Aerial Vehicles (UAV) system for low altitude aerial photogrammetry, i.e., flying platform, imaging sensor system and data processing software, are discussed. First of all, according to the technical requirements about the least cruising speed, the shortest taxiing distance, the level of the flight control and the performance of turbulence flying, the performance and suitability of the available UAV platforms (e.g., fixed wing UAVs, the unmanned helicopters and the unmanned airships) are compared and analyzed. Secondly, considering the restrictions on the load weight of a platform and the resolution pertaining to a sensor, together with the exposure equation and the theory of optical information, the principles of designing self-calibration and self-stabilizing combined wide-angle digital cameras (e.g., double-combined camera and four-combined camera) are placed more emphasis on. Finally, a software named MAP-AT, considering the specialty of UAV platforms and sensors, is developed and introduced. Apart from the common functions of aerial image processing, MAP-AT puts more effort on automatic extraction, automatic checking and artificial aided adding of the tie points for images with big tilt angles. Based on the recommended process for low altitude photogrammetry with UAVs in this paper, more than ten aerial photogrammetry missions have been accomplished, the accuracies of Aerial Triangulation, Digital orthophotos(DOM)and Digital Line Graphs(DLG) of which meet the standard requirement of 1:2000, 1:1000 and 1:500 mapping.

Highlights

  • UAV (Unmanned Aerial Vehicles) refers to the unmanned aircraft, including the fixed wing unmanned aircraft, the rotor unmanned aircraft and unmanned airship, etc.1.1 Why the Need for the UAV Systems (UAVS) for Low Altitude Aerial PhotogrammetryIn modern society, timely and fine surveying and mapping are needed, which need the help of UAVS for low altitude aerial photogrammetry.1) The Need of Timely Surveying and Mapping Nowadays satellite remote sensing and the general aviation remote sensing using the manned aircraft have been developed (National Remote Sensing Center, 2009), but there are many shortcomings in the timeliness for economic and social services

  • Timely and fine surveying and mapping are needed, which need the help of UAVS for low altitude aerial photogrammetry

  • The aerial photogrammetry software for the data obtained by the ordinary manned airplane has already been very mature (Yuan Xiuxiao, 2001), which cannot solve the problems meted by the low altitude aerial photogrammetry with UAV

Read more

Summary

INTRODUCTION

UAV (Unmanned Aerial Vehicles) refers to the unmanned aircraft, including the fixed wing unmanned aircraft, the rotor unmanned aircraft and unmanned airship, etc. Timely and fine surveying and mapping are needed, which need the help of UAVS for low altitude aerial photogrammetry. At 11:00 in this place an emergency happened, so it is no hope to use this satellite in this day Another example is that a road is planning to build with the length of 500km from east to west, so the images with 1m resolution for the engineering planning and design are urgently needed. The resolution of satellite remote sensing images has reached to 0.3 meter, but more highresolution is needed for the development of modern society, such as 5 centimeter (which matches to the map resolution of 1:500), and that the three-dimensional high resolution is asked for. Only UAVS for low altitude aerial photogrammetry is the advantage technical mean for the current development of three-dimensional fine mapping

The Advantage of UAVS for Low Altitude Aerial Photogrammetry
The Technical Requirements of UAV for Low Altitude Aerial Photogrammetry
Available Platform of the UAVS for Low Altitude Aerial Photogrammetry
The exposure equation
Optical Information Quantity
Combined Wide-angle Digital Cameras
The software named MAP-AT
Experiments
Findings
Conclusion
Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call