Camera Focal Length and Flight Altitude to Map with Intel® Insight Platform

เอกสาร

การติดตั้งและตั้งค่า

000028572

11/07/2019

Consider the following when you select the camera focal length and flight altitude:

  • At a defined altitude, increasing the focal length captures a smaller area.
    • The Ground Sampling Distance (GSD) value decreases. One pixel captures a smaller area and the image has a higher spatial resolution.
  • At a defined focal length, decreasing the altitude captures a smaller area.
    • The GSD value will decrease. One pixel captures a smaller area and the image has a higher spatial resolution.
Note The image rate needs to be increased to maintain a good overlap.

Terrains

  • Forest and dense vegetation: Flying higher helps for the reconstruction, but the spatial resolution will be lower.
  • Buildings: Flying higher reduces the artifacts at the building edges, but the spatial resolution will be lower.

    Low/High altitude

Overlap

  • Low altitude with big focal length requires a high image rate to maintain a good overlap.
  • For a given focal length and a given image rate, increasing the altitude will increase the overlap.

    Altitude/Image rate

Related topics
Image Acquisition and Flight Planning
Compute Flight Height for Ground Sampling Distance
Compute the Image Rate for Frontal Overlap

Copyright © 2018 Intel Corporation. Portions of these materials are copyright © Pix4D SA and used by permission. All rights reserved.