Synopsis of UAV Video Imagery

Dewi Kharismawati and Toni Kazic

2021-01-28

dek8v5@mail.missouri.edu, kazict@missouri.edu

Summary Metadata for Crop UAV Imagery,28 Jan 2021

Description

Video Imagery

The summary table below characterizes the raw video imagery in iplant/home/shared/tonikazic/cornet_data/images/. The imagery is mostly of maize fields.

All imagery was obtained with a DJI Phantom 4 freely flown over sites in Missouri, USA. No structural alterations to the vehicle or its camera were made; by 2019, the Phantom 4 had accumulated errors in its gimbal position. We used the AutoPilot app to fly and collect (relatively inaccurate) vehicle telemetry.

Trajectory components (altitudes, velocities, movements) and camera positions (nadir, several different oblique views) varied. All flights were at relatively low altitudes, ca. 25–100 ft above ground level (AGL). The vehicle was flown in relatively light winds, but occasionally experienced horizontal and vertical displacements due to air currents.

Video was collected at 24 frames/sec in 24-bit color depth on Secure Digital High Capacity (SDHC) cards inserted on the vehicle. The Phantom 4 can record a maximum of about 19 min 42 sec of video, providing about 30,000 frames of 4069 × 2160 pixels.

See reference [2] for detailed descriptions of movements.

Paths to the files are relative to this directory.

Dates are in ISO 8601 format, YYYY-MM-DD.

Imagery metadata

The subdirectory iplant/home/shared/tonikazic/cornet_data/metadata_imagery subdirectory contains some crude camera and vehicle metadata extracted from the imagery using ExifTool. Its organization follows that for the images, except that the metadata for an entire subdirectory of videos is concatenated into one file.

Summary Table

crop ref ref file trajectory movement camera pose imaging date imagery metadata
senesced maize 1   16r/barbara/10.7/DJI_0026.MOV parallel then perpendicular to row forward and backward with slide nadir 2016-07-10 16r/10.7_metadata
maize 1   16r/barbara/24.9/DJI_0003.MOV orbit mix (dominant forward, rotation, scale) nadir, oblique 2016-09-24 16r/24.9_metadata
maize   2 19r/barbara/23.7/DJI_0167.MOV parallel then perpendicular to row forward and backward with slide, left and right slide nadir 2019-07-23 19r/23.7_metadata
maize   2 19r/barbara/24.7/DJI_0170.MOV parallel then perpendicular to row forward, backward, right, and left slide andir 2019-07-24 19r/24.7_metadata
maize   2 19r/barbara/24.7/DJI_0171.MOV perpendicular to row forward, backward, right, and left slide nadir 2019-07-24 19r/24.7_metadata
maize   2 19r/barbara/24.7/DJI_0172.MOV perpendicular to row, straight on target left and right slide, scale nadir 2019-07-24 19r/24.7_metadata
maize   2 19r/barbara/24.7/DJI_0173.MOV straight scale nadir 2019-07-24 19r/24.7_metadata
maize 1 2 19r/barbara/24.7/DJI_0174.MOV parallel to row forward then backward nadir 2019-07-24 19r/24.7_metadata
maize   2 19r/barbara/24.7/DJI_0175.MOV perpendicular to row, straight on target right and left slide, rotation nadir 2019-07-24 19r/24.7_metadata
maize   2 19r/barbara/24.7/DJI_0176.MOV cruising all movements nadir 2019-07-24 19r/24.7_metadata
seedling maize   2 19r/barbara/24.7/DJI_0179.MOV parallel to row forward with rotation nadir 2019-07-24 19r/24.7_metadata
maize   2 19r/barbara/25.7/DJI_0201.MOV parallel and perp to row forward, backward, left, and right slide nadir 2019-07-25 19r/25.7_metadata
maize   2 19r/barbara/25.7/DJI_0202.MOV perpendicular to row forward, backward, left, right, rotation nadir 2019-07-25 19r/25.7_metadata
maize   2 19r/barbara/25.7/DJI_0203.MOV straight on target rotation, scale nadir 2019-07-25 19r/25.7_metadata
maize   2 19r/barbara/25.7/DJI_0205.MOV straight on target scale nadir 2019-07-25 19r/25.7_metadata
maize   2 19r/barbara/25.7/DJI_0206.MOV parallel to row forward with rotation oblique 2019-07-25 19r/25.7_metadata
maize   2 19r/barbara/25.7/DJI_0207.MOV perpendicular to row forward with rotation oblique 2019-07-25 19r/25.7_metadata
maize   2 19r/barbara/25.7/DJI_0213.MOV orbit right, anticlockwise rotation sharp oblique 2019-07-25 19r/25.7_metadata
maize   2 19r/barbara/3.8/DJI_0274.MOV orbit right and anticlockwise rotation sharp oblique 2019-08-03 19r/3.8_metadata
maize   2 19r/barbara/25.8/DJI_0360.MOV parallel to row forward backward slide sharp oblique 2019-08-25 19r/25.8_metadata
maize   2 19r/barbara/25.8/DJI_0362.MOV fixed scaling nadir 2019-08-25 19r/25.8_metadata
farm buildings   2 19r/barbara/27.8/DJI_0368.MOV cruising scaling, backward, left, forward, rotation, right, hover nadir 2019-08-27 19r/27.8_metadata
maize   2 19r/barbara/29.8/DJI_0413.MOV parallel to row forward and backward with slide nadir 2019-08-29 19r/29.8_metadata
summer forest   2 19r/barbara/4.10/DJI_0466.MOV cruising forward, rotation, hover oblique, nadir 2019-10-04 19r/4.10_metadata
fall forest   2 19r/barbara/5.11/DJI_0517.MOV cruising forward, rotation nadir, oblique 2019-11-05 19r/5.11_metadata
farm pond   2 19r/barbara/10.11/DJI_0520.MOV cruising forward, left, hover, right oblique 2019-11-11 19r/10.11_metadata

References

1. R. Aktar, D. E. Kharismawati, K. Palaniappan, H. Aliakbarpour, F. Bunyak, A. E. Stapleton, and T. Kazic. Robust mosaicking of maize fields from aerial imagery. Appl. Plant Sci., 8:e11387, 2020. doi: 10.1002/aps3.11387.

2. D. E. Kharismawati, H. Aliakbarpour, R. Aktar, F. Bunyak, K. Palaniappan, and T. Kazic. CorNet: unsupervised deep homography estimation for agricultural aerial imagery. In A. Bartoli and A. Fusiello, editors, /European Conference on Computer Vision 2020 Workshops, part VI: Computer Vision Problems in Plant Phenotyping (CVPPP 2020)/, number 12540 in Lec. Notes Comp. Sci., pages 402–419, Basel, 2020. Springer Verlag. doi: 10.1007/978-3-030-65414-6 28.