Difference between revisions of "UAS Phenotyping and Aerial Image Acquisition Procedures"

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   2.7. [[Preparing Data For Archiving]]
   2.7. [[Preparing Data For Archiving]]
1. Flight Checklists
  1.1. Preflight Checklist – Before Leaving for Field
      1.1.1. UAS accessory list
              ❏ Transmitter
              ❏ Radio with USB cable
              ❏ UAV batteries and battery chargers
              ❏ Propellers and extra propellers
              ❏ Tool kit (wrench set, propeller hex-key, camera mount screws and screw driver etc.)
              ❏ Gimbal
              ❏ Camera(s) with fully charged batteries
              ❏ SD cards with CHDK installed
              ❏ Voltmeter (optional)
              ❏ Calibration reference panel and metal stand (optional)
              ❏ Ground Control Points installed (optional)
      1.1.2. Things to check before leaving for field
              ❏ An updated version of Mission Planner Software is installed on the field laptop.
              ❏ Has the field map been cached in the Mission Planner program ? Details on map caching procedure are discussed below in section x.x.
                (Note: This step is required only once for each new phenotyping field.)
              ❏ Does RC Transmitter have enough voltage?  FrSky transmitter should have ≥ 9.4V charge. 
              ❏ Are UAV batteries charged? 3-cell batteries should charge to 12.6V.
              ❏ Is the laptop charged? Do you need/have a laptop charger?
              ❏ Ensure that you are familiar with the laws and regulations related to flying UAVs in your country/area. General laws in the United States
                require 400 Feet maximum height and within line-of-sight flying.
              ❏ Make sure you have watched all the UAV manufacturer recommended tutorials before your first flight. 
              ❏ When first flying your IRIS+, make sure to fly it away from people and in an open area. 
              ❏ Before the first flight make sure to perform a compass calibration otherwise this could lead to a bad behaviour in GPS enabled modes. You can
                perform the compass calibration through APM Planner or Mission Planner following these procedures https://www.youtube.com/watch?v=oD9Z9IR2TNU
      1.2.  Field Setup
            ❏ Early in the season, distribute at least ten ground control points (GCP) uniformly throughout the field. Four GCPs go in the field corners and rest
              are distributed inside the field, preferably in the alley ways for better visibility.  Survey the GCPs with either RTK or a DGPS GNSS systems,
              whichever available.
              Make sure the GCPs are not not disturbed once surveyed through the entire field season. That is why the choice of placement of the GCPs important to
              avoid any disturbance. 
              Generally the white color GCPs are easy to spot hence should be preferred.  Some photogrammetry softwares support automatic GCP detection. When
              available, customized GCPs can also be used.  Here are a few examples of GCPs that have worked well for us:
                  i. Color brick/pavers
                  ii. Metal sheets
                  iii. Plastic discs/frisbees
            ❏ Place the reference calibration panel on a fixed metal frame (or on a flat spot if frame is not available) close to the first mission waypoint at a
                fixed position (Figure 1.1)
              Note: The panel can also be utilized as a launchpad. Also, in order to minimize the variations due to varying sun illumination and overcast, maximum
              aerial shots of calibration panel at regular intervals are recommended. A 20% gradient grayscale calibration panel can be used. This can be achieved either
              by using multiple calibration targets or by capturing images of a target at every landing and takeoff event during the mission.
            ❏ Mark the four corners of calibration panel with flags and survey them with RTK or DGPS GNSS system, whichever available. 
              Fixed panel positions make the automatic extraction of individual color panels easier during the post-processing steps.
          '''Figure 1.1''': Example of a grayscale calibration panel attached on a metal frame.

Revision as of 18:55, 7 December 2015

Table of Contents

1. Flight Checklists

 1.1. Pre-Flight Guide – Before Leaving For Field
     1.1.1. UAS Accessory List
     1.1.2. Things to check before leaving lab
 1.2. Field-setup Guideline
 1.3. At-field- Pre-Flight Checklist 
     1.3.1. Camera settings
 1.4. At-Field- In-Flight Checklist
 1.5. Post-Flight Checklist
 1.6. Ground Truthing and Agronomic Notes (Optional)

2. How-to Guide

 2.1. CHDK Installation on SD Card
 2.2. Camera Settings
 2.3. Mission Planner Program and Driver Installation
 2.4. Ground Map Caching on Mission Planner
 2.5. Mission Planning 
 2.6. Downloading Data Flash Logs
 2.7. Preparing Data For Archiving