Acquisition modes

Learn about mono, stereo, and tri-stereo acquisition modes.


Overview

Optical imagery can be captured in a variety of acquisition modes. These modes have varying levels of complexity and can be used for different purposes.

Types of acquisition modes

Optical collections offer imagery that is captured in three primary acquisition modes: mono, stereo, and tri-stereo.

Mono

Mono or monoscopic acquisition mode is when an imaging system captures a single image of an area of interest (AOI). This is a relatively simple acquisition mode and can be used to obtain imagery for general visualization, mapping, and basic analysis.

Stereo

Stereo or stereoscopic acquisition mode is when, during the same or subsequent pass, an imaging system captures at least two images of an AOI, with different viewing angles. The different viewpoints will still be in the same orbit. Stereo pairs provide depth information that can be used to produce digital elevation models and derive terrain elevation information.

Tri-stereo

Tri-stereo acquisition mode is a more complex type of stereo mode, where a third additional image is captured of the AOI in a near-vertical position. Tri-stereo triplets can be used for dense urban or mountainous areas, where elevation may block the line of sight of the sensor to the AOI.

Tri-stereo acquisition modes can minimize the risk of blind spots in mountainous regions

Availability

Tasking collections

CollectionMonoStereoTri-stereo
AxelGlobeSupported inline-icon-large
Mono
Not supported inline-icon-largeNot supported inline-icon-large
Beijing-3ASupported inline-icon-large
Mono
Supported inline-icon-large
Stereo
Not supported inline-icon-large
Beijing-3NSupported inline-icon-large
Mono
Supported inline-icon-large
Stereo
Supported inline-icon-large
Tri-stereo
BlackSkySupported inline-icon-large
Standard
Supported inline-icon-large
Stereo
Burst
Area Coverage
Not supported inline-icon-large
EROS-BSupported inline-icon-large
Basic
Supported inline-icon-large
Stereo
Supported inline-icon-large
Triplet
EROS-CSupported inline-icon-large
Basic
Supported inline-icon-large
Stereo
Supported inline-icon-large
Triplet
KOMPSAT-3Supported inline-icon-large
Mono
Supported inline-icon-large
Single Pass Stereo
Multi Pass Stereo
Not supported inline-icon-large
KOMPSAT-3ASupported inline-icon-large
Mono
Supported inline-icon-large
Single Pass Stereo
Multi Pass Stereo
Not supported inline-icon-large
Near Space LabsSupported inline-icon-large
Mono
Not supported inline-icon-largeNot supported inline-icon-large
PléiadesSupported inline-icon-large
Mono
Supported inline-icon-large
Stereo
Supported inline-icon-large
Tri-stereo
Pléiades NeoSupported inline-icon-large
Mono
Supported inline-icon-large
Stereo
Supported inline-icon-large
Tri-stereo
SatellogicSupported inline-icon-large
Mono
Not supported inline-icon-largeNot supported inline-icon-large
SPOTSupported inline-icon-large
Mono
Supported inline-icon-large
Stereo
Supported inline-icon-large
Tri-stereo
TripleSatSupported inline-icon-large
Mono
Not supported inline-icon-largeNot supported inline-icon-large
Vision-1Supported inline-icon-large
Mono
Not supported inline-icon-largeNot supported inline-icon-large

Catalog collections

Mono imagery is available on the console, but the availability of stereo and tri-stereo may differ depending on the collection. Some imagery is only available upon request.

CollectionMonoStereoTri-stereo
Beijing-3ASupported inline-icon-large
Mono
Supported inline-icon-large
Stereo
Not supported inline-icon-large
EROS-BSupported inline-icon-large
Basic
Not supported inline-icon-largeNot supported inline-icon-large
EROS-CSupported inline-icon-large
Basic
Not supported inline-icon-largeNot supported inline-icon-large
HexagonSupported inline-icon-large
Mono
Not supported inline-icon-largeNot supported inline-icon-large
Landsat 8Supported inline-icon-large
Mono
Not supported inline-icon-largeNot supported inline-icon-large
Near Space LabsSupported inline-icon-large
Mono
Not supported inline-icon-largeNot supported inline-icon-large
PléiadesSupported inline-icon-large
Mono
Supported inline-icon-large
Stereo (upon request)
Supported inline-icon-large
Tri-stereo (upon request)
Pléiades NeoSupported inline-icon-large
Mono
Supported inline-icon-large
Stereo (upon request)
Supported inline-icon-large
Tri-stereo (upon request)
Sentinel-2Supported inline-icon-large
Mono
Not supported inline-icon-largeNot supported inline-icon-large
SPOTSupported inline-icon-large
Mono
Supported inline-icon-large
Stereo (upon request)
Supported inline-icon-large
Tri-stereo (upon request)
TripleSatSupported inline-icon-large
Mono
Not supported inline-icon-largeNot supported inline-icon-large
Vexcel AerialSupported inline-icon-large
Mono
Not supported inline-icon-largeNot supported inline-icon-large

Troubleshooting

What is the optimal B/H ratio?

Base/height ratio refers to how close apart stereo or tri-stereo images are taken relative to the height of the passing imaging system. It’s an important parameter for imagery that is going to be used to generate elevation models.

For automated elevation model generation, the optimum B/H ratio is 0.25. Otherwise, follow these guidelines:

  • For flat regions, use a higher B/H ratio.
  • For mountainous or dense urban areas, use a lower B/H ratio.

An image showing that lower B/H ratio can minimize risk of blind spots in mountainous regions

Can I create stereo pairs out of mono imagery?

If single-pass image pairs or triplets aren’t available, mono imagery with similar inclination angles over the same AOI can be used. This will require additional co-registration steps to ensure images align correctly for any subsequent analysis. This approach is not suited for AOIs with vegetation cover, and cannot be used for subsequent vegetation management analysis.

Artificial stereo pairs can be ordered using the Python SDK. For more information, see the Searching for real and false stereo Jupyter notebook.

Why do stereo and tri-stereo acquisitions take longer?

Stereo and tri-stereo acquisitions require imaging systems to reorient their sensors on the fly to capture images from different angles. Executing these maneuvers may not be successful on the first attempt. As a result, these types of acquisitions can take longer than a simpler mono acquisition. For more information on how order parameters affect the timeframe of your tasking order, see Tasking acquisition.

Learn more