MicaSense Altum Guía de configuración rápida
MicaSense Altum™ and DLS 2
Integration Guide
Revision 10
June 2020
Seattle, WA
© 2020 MicaSense, Inc MSPN 900-00021-01
June 2020
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Table of Contents
Table of Contents 1
Introduction2
Firmware 2
What’s Included? 2
Lens and Imager Information 3
Center wavelengths and bandwidth 4
Cameras with serial number AL05 or higher 4
Cameras with serial number AL04 or lower 5
Imager/band number and output 5
Measurements and Attachment Points 5
Recommendations for Installation 7
Configuration Options 8
Default + Overlap mode 8
Default + trigger by HTTP API 9
MAVLink with PixHawk or similar flight controller 9
DLS 2 with Aircraft GPS 10
HTTP Connection 10
Serial Connection 10
Input and Output 11
Host Interface Connector (Power and Data I/O) 12
Power supply specifications 12
Input and Output 13
USB Storage and Ethernet 13
Capture Rate 14
Accessory Port (ACC) 14
Automatic Capture/Triggering 14
Overlap (recommended) 14
Timer 15
External Triggering 15
External Trigger 15
HTTP API (Ethernet and Wi-Fi) 15
Serial API 16
© 2020 MicaSense, Inc
June 2020
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Disabled 16
Thermal Non-Uniform Calibration (NUC) 16
Downwelling Light Sensor 2 (DLS 2) 17
Measurements and Attachment Points 18
DLS 2 Connectors and Buttons 18
DLS 2 Installation Guidelines 20
Fixed-wing 20
Multirotor 20
Example Integration 21
Introduction
MicaSense Altum provides multiple options for integration - from stand-alone (where you only
provide power to the sensor) to fully customized integrations. Advanced integrations take
advantage of flexible interfaces including Ethernet, serial, and PWM/GPIO trigger, for seamless
integration with any aircraft.
Firmware
It is important to have the latest version of firmware installed on your sensor. Please see the
following page to get the latest version and learn how to update your firmware:
https://www.micasense.com/firmware-updates
What’s Included?
For the most up-to-date information on what’s included with the Altum sensor kit, please see
the Altum packing list.
© 2020 MicaSense, Inc
June 2020
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Lens and Imager Information
Multispectral
Thermal
Pixel size
3.45 μm
12 μm
Resolution
2064 x 1544 px
(3.2 MP x 5 imagers)
160 x 120 px
(0.01 K)
Aspect ratio
4 : 3
4 : 3
Sensor size
7.12 x 5.33 mm
(8.9 mm diagonal)
1.92 x 1.44 mm
Focal length
8 mm
1.77 mm
Field of view (h x v)
48º x 36.8º
57º x 44.3º
Thermal sensitivity
n/a
< 50 mK
Thermal accuracy
n/a
+/- 5 K
Output bit depth
12-bit
14-bit
GSD @ 120 m (~400 ft)
5.2 cm
81 cm
GSD @ 60 m (~200 ft)
2.1 cm
41 cm
© 2020 MicaSense, Inc
June 2020
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Center wavelengths and bandwidth
Cameras with serial number AL05 or higher
Name
Center
Bandwidth
Blue
475 nm
32 nm
Green
560 nm
27 nm
Red
668 nm
16 nm
Red edge
717 nm
12 nm
Near infrared
842 nm
57 nm
Thermal
11 μm
6 μm
© 2020 MicaSense, Inc
June 2020
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Cameras with serial number AL04 or lower
Name
Center
Bandwidth
Blue
475 nm
20 nm
Green
560 nm
20 nm
Red
668 nm
10 nm
Red edge
717 nm
10 nm
Near infrared
840 nm
40 nm
Thermal
11 μm
6 μm
Imager/band number and output
1
Blue
2
Green
3
Red
4
NIR
5
Red edge
6
Thermal
Measurements and Attachment Points
There are four M3 screw holes at 60 mm x 35 mm on-center. The sensor can be attached to
the host aircraft using at least two of the four provided threaded mounting points and M3 x 0.5
screws. If using only two mounting points, it is important to choose two threaded points
opposite of each other.
© 2020 MicaSense, Inc
June 2020
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Length
82 mm
Width
67 mm
Height
64.5 mm
Weight
357 g
© 2020 MicaSense, Inc
June 2020
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Recommendations for Installation
The Altum should be installed such that it has a clear view of the area directly below the
aircraft. The “cone” of the lenses, especially thermal, which has the widest field of view (57º
HFOV), should be considered in the process of deciding where to mount the sensor on the
aircraft or payload bay.
Avoid putting windows or covers in front of the thermal sensor. Many materials that are
transparent in visible bands are opaque in LWIR (thermal), so any coverings may prevent data
collection. Even materials that are mostly transparent in LWIR will negatively affect the
radiometric accuracy of the sensor output.
The multispectral sensors feature a global shutter and can withstand some vibration without
degrading image quality; nevertheless, we recommend vibration isolation between the sensor
mounting platform and the aircraft.
Make sure the sensor points straight down (with respect to the earth) at all times during flight.
The best way to ensure this is to use a gimbal.
Airflow over all surfaces of the sensor is necessary for proper heat dissipation. Do not run Altum
on the bench or in the field for extended periods of time without airflow. Do not completely
cover or insulate the back surface of the sensor.
Normally, the sensor should be in landscape orientation. If you plan to mount the sensor in a
portrait orientation, remember to swap the vertical and horizontal parameters in your mission
planner.
Ensure that the sensor is completely protected during landing. Note that we do not
recommend using a lens cover during flight as it can filter the wavelengths that the sensor
measures. Instead, protect the sensor with a recessed installation or by using landing gear.
Use the provided lens cover when storing Altum, and do not set Altum lens-side-down as it will
rest on and scratch the lenses.
More integration guidelines for the DLS 2 are in the DLS 2 section of this guide.
© 2020 MicaSense, Inc
June 2020
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Configuration Options
There are many ways to configure Altum. The following summaries will help you choose the
one that meets your needs. Many other options are possible. If you have any questions about
your integration, please contact [email protected]
Default + Overlap mode
The default configuration uses the DLS 2’s integrated GPS. Use the provided cable to connect
the DLS 2 to the DLS 2 board on the HOST connector. Ensure the DLS 2’s physical installation
meets the requirements outlined later in the DLS 2 section of this guide. Connect a compatible
power supply to pins 1 and 2 on the HOST connector. For more details about power, see the
Input and Output section of this guide.
Once attached to the aircraft, use the Flight Calculator to determine the necessary overlap
percentage for your desired Ground Sample Distance and Target Altitude, then input the
parameters into the Overlap settings, outlined in the Triggering section in this guide. The
sensor will begin capturing once it is within the Target Altitude Tolerance of your Target
Altitude. It will capture often enough to maintain your overlap percentage at your desired
altitude. This will ensure enough coverage to create a mosaic of your flight area with your
preferred photogrammetry software.
© 2020 MicaSense, Inc
June 2020
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Default + trigger by HTTP API
With this configuration, instead of automatically capturing with an automatic triggering mode,
the HTTP API (see below) is used with an onboard computer to trigger the camera at intervals
determined by your computer. See examples of the HTTP API here: Integration examples for
MicaSense sensors.
MAVLink with PixHawk or similar flight controller
The Altum can be triggered with a PixHawk flight control system using the serial API.
MicaSense cameras currently use the MAVLink v1.0 messaging protocol for the serial API,
which the camera uses to interact with PixHawk. You can read more detailed information here:
Guide for MicaSense Sensors and PixHawk.
© 2020 MicaSense, Inc
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