Pix4Dreact - FAQ

What is Pix4Dreact?

Pix4Dreact is a fast-mapping desktop software that allows you to rapidly process drone-captured images into accurate 2D maps when time is of the essence and internet connectivity is not available. Pix4Dreact is designed for public safety, emergency management, humanitarian and disaster relief to improve situational awareness and provide critical information.

How does Pix4Dreact work?

Pix4Dreact turns drone images into a 2D map. To achieve that, the software uses a direct-to-orthomosaic photogrammetry pipeline optimized for fast processing of mostly flat terrain from drone imagery. By focusing on this specific output, we can provide high-quality maps processed in a fraction of time, providing you with immediate situational awareness while still on-site using a laptop.

How do I try Pix4Dreact?

Every Pix4D account comes with a 30-day subscription of Pix4Dreact.

Simply download Pix4Dreact from the download page.

What hardware specifications do you need to run Pix4Dreact?

You can review the hardware requirements here.

Will my hardware affect the quality of my maps?

The image processing speed is directly correlated with the performance of your hardware. The quality of the generated map will not be affected by different hardware configurations.

How can I download Pix4Dreact?

Click here to download the latest release of Pix4Dreact.

How many computers can be used with the same account?

Each Pix4Dreact license is linked to a Pix4D account. Pix4Dreact can run on one computer at a time, but the license is floating and can be used to log in on any number of computers.

Does Pix4Dreact process the data on the cloud or locally?

Pix4Dreact fast processing engine processes the data locally on your computer and does not need cloud or any internet connection, other than to activate the license for the first time.

Can I use Pix4Dreact with no internet connection?

Yes, Pix4Dreact is specifically developed to convert images into high-resolution maps, with no cloud or internet connection required. However, before using it on a new computer, you will need to activate your license. While connected to the internet, log into your Pix4D account (or create a new one) and select a license so that you can use Pix4Dreact. The software will store this license on your computer until it expires, so you can work offline.

Which drones are compatible with Pix4Dreact?

Pix4Dreact will process imagery from the most popular drone models on the market today. We are actively working on supporting more RGB cameras in Pix4Dreact, and subsequent updated versions will have more camera model support. The list below contains most of the supported cameras:

DJI Phantom series
DJI X3S, X4S
DJI Mavic 1 Series
DJI Mavic 2 Pro
Aeryon SkyRanger RGB Cameras
senseFly RGB Cameras
Wingtra RGB Cameras
Parrot Anafi RGB 

For adding a new camera model in the Pix4Dreact database, contact support sending a good image dataset for the calibration. A good dataset needs to have the following properties:

  • Enough images (50 - 150 images).
  • High overlap and rich texture.

What are the inputs and outputs of Pix4Dreact?

Pix4Dreact allows the import of JPEG images, as well as .p4r files. The full list of input and output files is available in this article.

What’s the difference between a 2D map generated in Pix4Dmapper and Pix4Dreact?

To create an orthomosaic map, Pix4Dmapper takes into account fine-grained local variations in altitude, whereas Pix4Dreact uses a coarser ground model. If you have a lot of 3D structures in your maps, Pix4Dmapper will give more accurate results for the areas with the 3D structure. However, Pix4Dreact will still give good results on any surrounding flat area.

  1. Pix4Dreact can operate with lower overlap requirements compared to Pix4Dmapper. An image overlap of 60% is our minimum recommended value.
  2. Pix4Dreact operates a lot faster than Pix4Dmapper.

What is the difference between the Digital Surface Model (DSM) generated in Pix4Dreact and Pix4Dmapper?

With the DSM generated in Pix4Dmapper, you can get the accurate elevation value of each pixel, with or without above-ground objects, ready for your preferred GIS/CAD workflow.

DSMs generated in Pix4Dreact capture major ground shapes but are less sensitive to small structures. The absolute altitude of the DSM generated in Pix4Dreact will depend on the quality of the GPS information from the image acquisition.

What coordinate system is used by Pix4Dreact?

With Pix4Dreact, the coordinate system is the corresponding Universal Transverse Mercator (UTM) zone (datum WGS84).

Does Pix4Dreact support Ground Control Points (GCPs)?

Pix4Dreact does not support GCPs. If you need to use GCPs for improved accuracy and reconstruction, we recommend that you use Pix4Dmapper.

Can Pix4Dreact process oblique imagery?

Pix4Dreact supports processing nadir images captured with a drone camera pointing straight down. If you want to process oblique images, we recommend that you use Pix4Dmapper.

My map doesn’t look great. Why?

The quality of your map can be affected by factors such as reflective surfaces in the area (water or glass), or large areas of the same color or texture (snow, skies). Please reach out to Support if you are encountering such issues, we can identify the cause and provide some recommendations for your future flights.

Can I edit my maps in Pix4Dreact?

Not currently. If you would like to edit the map, you can export it and edit in a third-party application. Future versions will give more fine-grained control.
You can combine multiple flights into one map, as long as the maps are adjacent and have enough overlap. To combine multiple flights you have to simultaneously process all images taken during each flight into a single project.

Can I use non-aerial images with Pix4Dreact?

No, Pix4Dreact can only be used with aerial images, ideally captured by drones.

Does Pix4Dreact process thermal imagery?

Support for camera rigs combining RGB and thermal cameras will be added in a future release.

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