DJI P4 MULTISPECTRAL User guide

MULTISPECTRAL

User Manual v1.0

2019.12

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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 official DJITM website and read the disclaimer and safety guidelines before first time use. Prepare for your first flight 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 official 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	2
Legend	2
Before Flight	2
Video Tutorials	2
Download DJI GS Pro App	2
Download DJI Terra	2
Product Profile	6
Introduction	6
Feature Highlights	6
Preparing the Aircraft	7
Activating the Aircraft	8
Aircraft Overview	9
Remote Controller Overview	10
Aircraft	12
Profile	12
Flight Modes	12
Aircraft Status Indicators	13
Return to Home (RTH)	14
Aerial Photography Missions	18
RTK Functions	19
Vision System and Infrared Sensing System	20
Flight Recorder	23
Attaching and Detaching the Propellers	23
DJI Intelligent Flight Battery	24
Gimbal Cameras	31
Cameras	31
Gimbal	32
Remote Controller	34
Profile	34
Using the Remote Controller	34
Remote Controller Status LED	39
Linking the Remote Controller	39

Flight	41
Flight Environment Requirements	41
GEO (Geospatial Environment Online) System	41
Flight Restrictions	42
GEO Unlocking	43
Preflight Checklist	44
Calibrating the Compass	44
Starting/Stopping the Motors	45
Stopping Motors Mid-flight	46
Flight Test	46
DJI Assistant 2 for Phantom	49
Installation and Launching	49
Using DJI Assistant 2 for Phantom	49
Appendix	51
Specifications	51

Product Profile

This section introduces the P4 Multispectral and lists the components of the aircraft and remote controller.

Product Profile

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 difference 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 five 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) differential corrections (supported later).

The P4 Multispectral can hover and fly 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 flight safety.

Built into the remote controller is the latest DJI OcuSync technology with enhanced antiinterference 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 figure.

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 affect the flight 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

1Press the button on the top right side of the mobile device holder to release the clamp, then adjust the clamp to fit the size of your mobile device.

2Secure your mobile device in the clamp by pressing down.

3Plug 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 first time, activate it using DJI GS Pro. Ensure that your iPad has access to the internet.

P4 Multispectral User Manual

Aircraft Overview

	9	10
14	9
14
	13	8
	13

			6	7
			6
				5	4
					4
					3
		c		2
a	b	c		1
12		e	f
	d		f
	d

	18
15	16	17
15

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

7
8	9
	9

		3
	1					17	17
						19	18
4		2		10
		2			11			12
	5


			6		13	14	15	16
			6

1.Power Button

Used to turn the remote controller on and off.

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 configuration.

Aircraft

This section introduces the aircraft components, features and functions.

Aircraft

Profile

The P4 Multispectral aircraft includes a flight 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 different flight 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 sufficient, the aircraft uses Vision System for positioning. When the forward obstacle sensing is enabled and lighting conditions are sufficient, the maximum flight attitude angle is 25° with a maximum flight speed of 31 mph (50 kph). When forward obstacle sensing is disabled, the maximum flight attitude angle is 35° and the maximum flight 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 figure 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 flight controller. Refer to the table below for more information about the Aircraft Status Indicators.

Aircraft Status Indicator Description

Normal
	Alternate red, green and yellow flashing	Turning On and Self Diagnostic
	Alternate red, green and yellow flashing	Testing
		Testing
	Alternate green and yellow flashing	Warming Up
	Slow green flashing	P-mode with GNSS or RTK
×2	Two green flashes	P-mode with Vision System
	Slow yellow flashing	A-mode but No GNSS or Vision
	Slow yellow flashing	System
		System
	Fast green flashing	Braking
Warning
	Fast yellow flashing	Remote Controller Signal Lost
	Slow red flashing	Low Battery Warning
	Fast red flashing	Critical Battery Warning
	Red flashing	Uneven Placement or Large Sensors
	Red flashing	Bias
		Bias
— Solid red		Critical Error
	Alternate red and yellow flashing	Compass Calibration Required

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	location from which the aircraft launched. The GNSS signal strength is indicated
Point	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 sufficient. 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 fly 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 flight route as it flies. 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 flight 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

4 Signal Lost Lasts (after 3 sec.)

>3S

Fast Blinking Yellow

2 Confirming Home Point

Blinking Green

5 RTH (adjustable altitude)

×		Height over HP>Failsafe Altitude
×		Elevate to Failsafe Altitude
		Failsafe Altitude

Height over HP<=Failsafe Altitude

Fast Blinking Yellow

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 affect 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 flight.

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			Sufficient battery
Critical Low battery level warning			level (Green)
(Red)	Low battery		level (Green)
(Red)	Low battery			Remaining flight time
	level warning (Yellow)			Remaining flight time
	level warning (Yellow)

	Power requires to return home
	Power requires to return home			12:29
				12:29
		Battery level Indicator

Battery Level

Warning

Low battery level warning

Critical Low battery level warning

Estimated remaining flight time

Remark	Aircraft	DJI GS Pro
Remark	Status	DJI GS Pro
	Indicator
Battery	Aircraft	N/A
power is	status
low. Fly	indicator
the aircraft	blinks RED
back.	slowly.
		DJI GS Pro
		display will
		flash red and
The aircraft	Aircraft	the aircraft
must land	status	will start to
immediately.	indicator	descend.
	blinks RED	The remote
	quickly.	controller will
		sound an
		alarm.
Estimated
remaining
flight based	N/A	N/A
on current	N/A	N/A
on current
battery
level.

Flight Instructions

The aircraft will return to the

Home Point automatically and 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.

Allow the aircraft to descend and land automatically.

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 reflect the estimated remaining flight 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 off, and cannot not be refreshed during flight. b) Aircraft must take off vertically. Take off altitude must be greater than 7 meters. c) Home point terrain features remain largely unchanged.

d) Home point terrain with no distinctive features will affect 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

		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 flying under 65 feet (20 meters) and RTH (including
20m		Smart RTH, Low Battery RTH and Failsafe RTH) is triggered, the
		aircraft will first 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
5m		when the aircraft flies within a 16-feet (5 meters) radius of the Home
H		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.

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