DJI P4 MULTISPECTRAL User guide

MULTISPECTRAL

User Manual

2019.12

v1.0

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Using This Manual

Legend

Warning Important Hints and Tips Reference

Before Flight

The following documents have been produced to help you safely operate and make full use of your aircraft:

1. In the Box

2. User Manual

3. Quick Start Guide

4. Disclaimer and Safety Guidelines

It is recommended to watch all tutorial videos on the ocial DJITM website and read the disclaimer and safety guidelines before rst time use. Prepare for your rst ight by reviewing the quick start

guide. Refer to this user manual for more details.

Video Tutorials

Go to the address below or scan the QR code on the right to watch the tutorial

videos, which demonstrate how to use the P4 Multispectral safely:

https://www.dji.com/p4-multispectral/video

Download DJI GS Pro App

The latest version of DJI GS Pro is required when using with the P4 Multispectral. Search for DJI GS Pro in App Store or scan the QR code to download the app on your iPad. Visit the ocial DJI website for more information about DJI GS Pro.

https://www.dji.com/ground-station-pro

Download DJI Terra

The multispectral images captured by the P4 Multispectral can be imported into DJI Terra for 2D multispectral map reconstructions. To download the latest version of DJI Terra and its user

manual, please visit: https://www.dji.com/dji-terra/info#downloads

The operating temperature of this product is 0° to 40° C. It does not meet the standard operating

temperature for military grade application (-55° to 125° C), which is required to endure greater

environmental variability. Operate the product appropriately and only for applications that it meets the

operating temperature range requirements of that grade.

Contents

Using This Manual

Legend

Before Flight

Video Tutorials

Download DJI GS Pro App

Download DJI Terra

Product Prole

Introduction

Feature Highlights

Preparing the Aircraft

Activating the Aircraft

Aircraft Overview

Remote Controller Overview

Aircraft

Prole

Flight Modes

Aircraft Status Indicators

Return to Home (RTH)

Aerial Photography Missions

RTK Functions

Vision System and Infrared Sensing System

Flight Recorder

Attaching and Detaching the Propellers

DJI Intelligent Flight Battery

Gimbal Cameras

Cameras

Gimbal

Remote Controller

Prole

Using the Remote Controller

Remote Controller Status LED

Linking the Remote Controller

Flight

Flight Environment Requirements

GEO (Geospatial Environment Online) System

Flight Restrictions

GEO Unlocking

PreightChecklist

Calibrating the Compass

Starting/Stopping the Motors

StoppingMotorsMid-ight

Flight Test

DJI Assistant 2 for Phantom

Installation and Launching

Using DJI Assistant 2 for Phantom

Appendix

Specications 51

Product Prole

This section introduces the and lists the components of the aircraft and remote controller.

P4 Multispectral

Product Prole

Introduction

The P4 Multispectral is a high-precision drone capable of multispectral imaging functions. The

imaging system contains six cameras with 1/2.9-inch CMOS sensors, capable of capturing both

color and narrow band images. The OCUSYNCTM HD image transmission built into both the

aircraft and remote controller ensures stable transmission. Using DJI GS Pro, users can view the normalized dierence vegetation index (NDVI) image in real time and gain insights into plant

health, understanding plant growth, soil conditions, and more. The images can also be used to

generate accurate multispectral index maps for detailed plant and soil status analyses, which

enable more precise agricultural operations. The aircraft has a built-in DJI Onboard D-RTKTM,

which provides precision data for centimeter-level positioning accuracy*.

Feature Highlights

The P4 Multispectral imaging system contains six cameras with 1/2.9-inch CMOS sensors, including an RGB camera and a multispectral camera array containing ve cameras for multispectral

imaging, covering the following bands: Blue (B): 450 nm ± 16 nm; Green (G): 560 nm ± 16 nm; Red

(R): 650 nm ± 16 nm; Red edge (RE): 730 nm ± 16 nm; Near-infrared (NIR): 840 nm ± 26 nm. The

spectral sunlight sensor on top of the aircraft detects the solar irradiance in real-time for image

compensation, maximizing the accuracy of collected multispectral data. The P4 Multispectral

uses a global shutter to avoid distortions that might be present when using a rolling shutter.

The P4 Multispectral aircraft has a built-in DJI Onboard D-RTK, providing high-precision data for centimeter-level positioning when used with Network RTK service or a DJI D-RTK 2. Raw satellite observations and exposure event records can be used for post-processed kinematic (PPK) dierential corrections (supported later).

The P4 Multispectral can hover and y in extremely low altitude and indoor environments, and

provides multi-directional obstacle sensing and vision positioning functions. Obstacles detection

and avoidance in large range and landing protection enhance ight safety.

Built into the remote controller is the latest DJI OcuSync technology with enhanced anti-

interference capability to deliver a more stable and smoother image transmission. When combined

with the receiver in the aircraft, the remote controller has a transmission range up to 4.3 mi / 7 km

(FCC-compliant version). Connect an iPad to the remote controller via the USB port to use DJI GS Pro app to plan and perform missions.

Import the image data into DJI GS Pro or DJI Terra to generate multispectral index maps** and

view the analysis.

* This should be used with Network RTK service, a DJI D-RTK 2 High-Precision GNSS Mobile Station

(purchased additionally) or post-processed kinematic (PPK) data (recommended when RTK signal is

weak during operation).

** Support for multispectral index maps in DJI GS Pro is coming soon.

P4 Multispectral User Manual

Preparing the Aircraft

1. Remove the gimbal clamp from the camera as shown in the gure.

2. Attaching the Propellers

Mount the propellers with black propeller rings to the motors with black dots. Mount the

propellers with sliver propeller rings to the motors without black dots. Press the propeller down

onto the mounting plate and rotate in the lock direction until it is secured.

3. Battery Installation

Slide battery into the battery compartment according to the arrow’s direction as shown below.

When the upper and lower buckles on the battery are in place, a click sound indicates the battery is

securely installed. Failure to do so may aect the ight safety of your aircraft.

P4 Multispectral User Manual

Preparing the Remote Controller

1. Tilt the mobile device holder or the display device on the remote controller to the desired

position, then adjust the antennas so they are facing outward.

2. Connecting your mobile device

Press the button on the top right side of the mobile device holder to release the clamp, then

adjust the clamp to t the size of your mobile device.

Secure your mobile device in the clamp by pressing down.

Plug one end of the cable into the mobile device, and the other end into the USB port on

the back of the remote controller.

Activating the Aircraft

When using your P4 Multispectral for the rst time, activate it using DJI GS Pro. Ensure that your iPad has access to the internet.

Aircraft Overview

P4 Multispectral User Manual

1. Gimbal Cameras

(with six cameras corresponding to the

wave bands below)

a. Red Edge (RE) b. Near-Infrared (NIR)

c. Green (G) d. Visible Light (RGB)

e. Red (R) f. Blue (B)

2. Downward Vision System

3. Micro USB Port

4. Camera/Linking Status Indicator and Link

Button

5. Camera microSD Card Slot

6. Forward Vision System

7. Infrared Sensing System

8. Front LEDs

9. Motors

10. Propellers

11. Aircraft Status Indicators

12. OcuSync Antennas

13. Onboard D-RTK Antenna

14. Spectral Sunlight Sensor

15. Rear Vision System

16. Intelligent Flight Battery

17. Power Button

18. Battery Level Indicators

P4 Multispectral User Manual

Remote Controller Overview

1819

1. Power Button Used to turn the remote controller on and o.

2. Return to Home (RTH) Button

Press and hold this button to initiate RTH.

3. Control Sticks

Controls aircraft movement. Can be set to

Mode 1, Mode 2, or Mode 3.

4. Status LED

Indicates whether the remote controller is

linked to the aircraft.

5. Battery Level LEDs

Displays the battery level of the remote

controller.

6. Power Port

Connect to the charger to charge the

battery of the remote controller.

7. Mobile Device Holder

Securely mounts your mobile device to the

remote controller.

8. Small Device Positioning Tabs (for mobile

phones)

9. Antennas

Relays aircraft control and image

transmission signals.

10. Handle Bar

11. Gimbal Dial

Use this dial to control the tilt of the

gimbal.

12. Reserved Dial

13. Video Recording Button Press to start recording video. Press again

to stop recording. (Video recording feature

available soon)

14. Flight Mode Switch

The P and S positions on the remote

controller are for P-mode, and the A position is for A-mode.

15. Shutter Button

Press to take a photo. Two-stage button.

Pictures will only be taken when the

shutter button is fully pressed.

16. Reserved Blank Button

17. C1 and C2 Buttons (customizable, custom

functions available soon)

18. USB Port (for mobile device connection) Connection to mobile device for DJI GS Pro.

19. Micro USB Port

Connects to a computer via a Micro USB

cable for conguration.

Aircraft

This section introduces the aircraft components, features and functions.

Aircraft

Profile

The P4 Multispectral aircraft includes a ight controller, a communication system, a positioning

system, a propulsion system and an Intelligent Flight Battery. This section describes the functions

of these components.

Flight Modes

The P4 Multispectral provides the following flight modes. Use the flight mode switch on the remote controller to switch between dierent ight modes. The P and S positions on the remote controller are for P-mode, and the A position is for A-mode.

P-mode (Positioning): P-mode works best when the GNSS signal is strong. The aircraft utilizes the GNSS / RTK module and Vision System to automatically stabilize itself and navigate between obstacles. When the GNSS signal is strong, the aircraft uses GNSS for positioning. When RTK

module is enabled and the differential data transmission is good, it provides centimeter-level

positioning. When the GNSS signal is weak and the lighting conditions are sucient, the aircraft uses Vision System for positioning. When the forward obstacle sensing is enabled and lighting conditions are sucient, the maximum ight attitude angle is 25° with a maximum ight speed of 31 mph (50 kph). When forward obstacle sensing is disabled, the maximum ight attitude angle is 35° and the maximum ight speed is 36 mph (58 kph).

A-mode (Attitude): GNSS is not used for positioning and the aircraft can only maintain altitude

using the barometer.

Attitude Mode Warning

The aircraft will enter A-mode in the following two instances:

Passive: When there is weak GNSS signal or when the compass experiences interference where the Vision System is unavailable.

Active: Users toggle the flight mode switch to A-mode.

In A-mode, the Vision System and some advanced features are disabled. Therefore, the aircraft cannot position or auto-brake in this mode and is easily affected by its surroundings, which may result in horizontal shifting. Use the remote controller to position the aircraft.

Maneuvering the aircraft in A-mode can be difficult. Before switching the aircraft into A-mode, make sure you are comfortable flying in this mode. DO NOT fly the aircraft too

far away as you might lose control and cause a potential hazard. Avoid ﬂying in conﬁned

spaces or in areas where the GNSS signal is weak. Otherwise, the aircraft will enter A-mode,

leading to potential ﬂight risks. Land the aircraft in a safe place as soon as possible.

P4 Multispectral User Manual

Aircraft Status Indicators

The P4 Multispectral has Front LEDs and Aircraft Status Indicators. The positions of these LEDs are shown in the gure below:

Front LEDs

Aircraft Status Indicators

The Front LEDs show the orientation of the aircraft. The Front LEDs glow solid red when the aircraft is turned on to indicate the front (or nose) of the aircraft. The Aircraft Status Indicators communicate the system status of the ight controller. Refer to the table below for more information about the Aircraft Status Indicators.

Aircraft Status Indicator Description

Normal

Alternate red, green and yellow ashing

Alternate green and yellow ashing Warming Up

Slow green ashing P-mode with GNSS or RTK

×2 Two green ashes P-mode with Vision System

Slow yellow ashing

Fast green ashing Braking

Warning

Fast yellow ashing Remote Controller Signal Lost

Slow red ashing Low Battery Warning

Fast red ashing Critical Battery Warning

Red ashing

— Solid red Critical Error

Alternate red and yellow ashing Compass Calibration Required

Turning On and Self Diagnostic

Testing

A-mode but No GNSS or Vision

System

Uneven Placement or Large Sensors

Bias

P4 Multispectral User Manual

Return to Home (RTH)

Return to Home (RTH) function brings the aircraft back to the last recorded Home Point. There are three types of RTH: Smart RTH, Low Battery RTH, and Failsafe RTH. This section describes

these three scenarios in detail.

GNSS

Description

If a strong GNSS signal was acquired before takeoff, the Home Point is the

Home

Point

location from which the aircraft launched. The GNSS signal strength is indicated by the GNSS icon ( Less than 4 bars is considered a weak GNSS signal).

The aircraft status indicators will blink rapidly when the home point is recorded.

The aircraft can sense and avoid obstacles when the Forward Vision System is enabled and lighting conditions are sucient. The aircraft will automatically climb up to avoid obstacles and descend slowly as it returns to the Home Point. To ensure the aircraft returns home forwards, it cannot rotate or y left and right during RTH while the Forward Vision System is enabled.

Failsafe RTH

The Forward Vision System allows the aircraft to create a real-time map of its ight route as it ies. If the Home Point was successfully recorded and the compass is functioning normally, Failsafe

RTH will be automatically activated if the remote controller signal is lost for more than three

seconds. The aircraft will plan its return route and retrace its original ight route home. During

RTH, if the remote controller signal is recovered, users can control the aircraft altitude and speed.

Press the RTH button once to cancel RTH.

Failsafe Illustration

1 Record Home Point

Blinking Green

Signal Lost Lasts (after 3 sec.)

>3S

× ×

Fast Blinking Yellow

2 Conrming Home Point

Blinking Green

RTH (adjustable altitude)

Height over HP>Failsafe Altitude

Elevate to Failsafe Altitude

Failsafe Altitude

Fast Blinking Yellow

Height over HP<=Failsafe Altitude

3 Remote Controller Signal Lost

Fast Blinking Yellow

6 Landing (after hovering for 5 secs)

Fast Blinking Yellow

Smart RTH

Use the RTH button on the remote controller when GNSS is available to initiate Smart RTH. The

aircraft will then automatically return to the last recorded Home Point. Use the remote controller to control the aircraft’s speed or altitude to avoid a collision during the Smart RTH process. As

the aircraft returns, it will use the primary camera to identify obstacles as far as 300m in front,

allowing it to plan a safe route home. Press and hold the Smart RTH button once to start the

process, and press the Smart RTH button again to terminate the procedure and regain full

control of the aircraft.

P4 Multispectral User Manual

Low Battery RTH

The low battery level failsafe is triggered when the DJI Intelligent Flight Battery is depleted to a point that may aect the safe return of the aircraft. The user can cancel the RTH procedure

by pressing the RTH button on the remote controller. The thresholds for these warnings are

automatically determined based on the aircraft’s current altitude and distance from the Home

Point. The Low Battery RTH will only be triggered once during the same ight.

The aircraft will land automatically if the current battery level can only support the aircraft long

enough to descend from its current altitude. The user cannot cancel the auto landing but can use

the remote controller to alter the aircraft’s orientation during the landing process.

The Battery Level Indicator is displayed in DJI GS Pro, and is described below:

Critical Low battery level warning

(Red)

Low battery

level warning (Yellow)

Sucient battery

level (Green)

Remaining ight time

Battery Level

Warning

Low battery

level warning

Critical Low

battery level warning

Estimated

remaining ight

time

Power requires to return home

Remark

Battery power is low. Fly the aircraft back.

The aircraft must land immediately.

Estimated remaining flight based on current battery level.

12:29

Battery level Indicator

Aircraft

Status

DJI GS Pro Flight Instructions

Indicator

The aircraft will return to the

Home Point automatically and

Aircraft

status indicator blinks RED slowly.

N/A

hover at 2 meters above the

Home Point. Users can also

cancel the RTH process and

land manually. Note: The Low Battery Level Warning will not

prompt after users cancel RTH and regain control.

DJI GS Pro

display will

ash red and

Aircraft

status indicator blinks RED

quickly.

the aircraft will start to descend. The remote controller will sound an

Allow the aircraft to descend

and land automatically.

alarm.

N/A N/A N/A

P4 Multispectral User Manual

When the Critical low battery level warning is triggered and the aircraft begins to land automatically,

push the left stick upward to make the aircraft hover at its current altitude, giving you an opportunity to navigate to a more appropriate landing location.

The colored zones and markers on the battery level indicator bar reect the estimated remaining

ight time. They are automatically adjusted according to the aircraft’s current location and status.

The Low Battery Warning threshold set in the Aircraft Battery settings page in the app is only for an

alert and will not trigger RTH.

Precision Landing

The aircraft automatically scans and attempts to match the terrain features underneath during

Return to Home. When current terrain matches home point terrain, the aircraft will start landing

immediately to achieve precision landing.

Landing Protection is active during precision landing. Precision Landing performance is subject to the following conditions:

a) Home point is recorded upon take o, and cannot not be refreshed during ight.

b) Aircraft must take o vertically. Take o altitude must be greater than 7 meters. c) Home point terrain features remain largely unchanged. d) Home point terrain with no distinctive features will aect the performance. e) Lighting conditions cannot be too light nor too dark.

The following actions are available during landing:

a) Pull throttle down to accelerate landing. b) Moving the control sticks in any other direction will stop Precision Landing. The aircraft will descend

vertically and Landing Protection will remain active.

RTH Safety Notices

20m

The aircraft cannot avoid obstruction during RTH when the Forward

Vision System is disabled. Users can use the remote controller to

control aircraft altitude and speed. It is important to set a suitable

Failsafe altitude before each flight. Go to Camera View in DJI GS Pro, tap the text under the Smart RTH button to set an RTH

altitude.

If the aircraft is ying under 65 feet (20 meters) and RTH (including Smart RTH, Low Battery RTH and Failsafe RTH) is triggered, the aircraft will rst automatically ascend to 65 feet (20 meters) from the

current altitude. You can only cancel the ascending by exiting the RTH.

The aircraft will automatically descend and land if RTH is triggered

when the aircraft ies within a 16-feet (5 meters) radius of the Home Point and when the aircraft altitude is under 98 feet (30 meters), or

if the obstacle sensing function is disabled. The aircraft will not as-

cend, and will land immediately at the current location.

+ 38 hidden pages

DJI P4 MULTISPECTRAL User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Using This Manual

Legend

Before Flight

Video Tutorials

Download DJI GS Pro App

Download DJI Terra

Introduction

Feature Highlights

Preparing the Aircraft

Activating the Aircraft

Aircraft Overview

Remote Controller Overview

Aircraft

Profile

Flight Modes

Aircraft Status Indicators

Return to Home (RTH)