Scenario

Introduction

The scenario is the only mandatory parameter when creating a SURE project. Its role is to make sure that all internal algorithms are optimized for the input data given to the project.

The scenario parameter selection consists of 3 possible choices:

  • Aerial Nadir

  • Aerial Oblique

  • Default

Each scenario is configured to guarantee an automatic parametrization of the project, which fits a certain flight configuration and camera.

The default values for the processing parameters are chosen considering the particularities of the input data while ensuring an optimal process for the minimum hardware requirements and obtaining the best quality results. Please find further instructions on how to adapt the default values to specific hardware or project requirements below.

Choosing the Scenario

Scenario Aerial Nadir

The Aerial Nadir scenario is suitable for projects where the image acquisition is performed with large photogrammetric camera systems for which:

  • image resolution is ≥ 60MP

  • imagery type: Nadir (RGB, PAN, RGBI, NIR)

It is designed for handling large scale production. 

This scenario will handle regular flight patterns having an overlap from 60/30 up until 80/80, as well as mixed flight overlaps or single flight strips (representative for corridor mapping).

The Aerial Nadir scenario in SURE implies:

  • Automatic handling of the stereo-model selection for various nadir flight patterns

  • Product output by default: 

    • DSM

    • True Ortho

  • Default tile size: 2000 GSD

  • Default processing quality level: Ultra

Scenario Aerial Nadir allows for specifying the amount of overlap between consecutive frames in-strip direction and in cross-strip direction.

For the cases with mixed overlap, it is recommended to specify the maximum overlap in-strip and in cross-strip direction.

The minimum value for the sideward overlap is 30%, according to the photogrammetric requirements of a flight. This value should be specified also for the case of corridor mapping projects (i.e. single strip projects).

In the cases of low overlap flights (less than 75% forward overlap and less than 50% sideward overlap) a GSD multiplicator of 2 will be applied to the size of the DSM/True Ortho raster cell. This is automatically applied to guarantee the completeness of results.

Supported flight patterns:

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Aerial: Regular Chessboard (Grid) Flight Pattern

 Aerial: Regular Non-Grid Flight Pattern


Aerial: Mixed Flight Overlaps

Aerial: Mixed Flight Overlaps and Flying Heights

Aerial: Mixed Flight Directions

Aerial: Single Strips of Flights for Corridor Mapping

For projects having completely unstructured or circular flight patterns, the Default Scenario should be used for processing. 

Scenario Aerial Oblique

The Aerial Oblique scenario is intended for projects where oblique camera systems have been used for the image acquisition.

  • image resolution is  ≥ 60MP

    • imagery type: Nadir mixed with Oblique frames (RGB, PAN, RGBI, NIR)

It is designed for handling large scale production.

The Aerial Oblique scenario in SURE implies:

  • Automatic handling of the stereo-model selection for various oblique flight patterns. Images are paired within the same viewing direction (e.g Nadir, Oblique East, Oblique South, etc.).

  • Product output by default: 

    • Point Cloud

    • Mesh

  • Default tile size: 2000 GSD

  • Default processing quality level: Ultra

Supported flight patterns:

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Aerial Oblique: Regular

Aerial Oblique: Mixed Flight Overlaps

Scenario Default

The Default scenario is intended for projects where drones or terrestrial camera setups have been used during the image acquisition

  • image resolution: various

The Default scenario in SURE implies:

  • Automatic handling of the stereo-model selection for any image acquisition pattern

  • Product output by default: 

    • Point Cloud

    • Mesh

  • Default tile size: 1000 GSD

  • Default processing quality level: High

Supported flight patterns or camera stations:

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Default: Structured

Default: Circular

Default: Unstructured Terrestrial

Default: Unstructured UAV

The presets that are mentioned for each scenario choice (e.g. tile size, enabled workflow, processing quality, etc.) can be optionally changed, using the SURE Interface (GUI or CLI). When doing this, the user should take into account the available hardware, as well as the project's requirements. Consider also performance optimization measures.

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