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ANDORRE : Instant
automatic orthorectification

You need
- You need to receive frequently and quickly up-to-date and precise cartographic data covering large areas.

You are :
  • Ministries of Agriculture, Defence and the Environment,
  • Mapping agencies and land planning departments,
  • Research organizations...
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User of large volumes of geographic information, you have to ensure the monitoring of your area of interest. You need high-accuracy products quickly without the need for specialist mapping knowledge.
  • SPOT receiving station operators
You wish to enlarge your product range with automatic production of orthoimages (level 3 - SPOTView) and DEMs.

We offer
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ANDORRE
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- Instant automatic rectification process -
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Instant automatic rectification process

- ANDORRE (for Atelier Numérique D’ORthoREctification) in French, is a digital orthorectification shop designed to support automatic production of:
  • Orthoimages,
  • Colour images, level 1A and 2A at 2.5 m and 5 m resolution,
  • Digital Elevation Models (DEMs).
Orthoimages are produced using Reference3D tiles to orthorectify SPOT level 1A scenes automatically.

Reference3D data are stored as one-degree-square tiles containing three layers of information:
  • HRS orthoimages, used by ANDORRE to extract ground control points (GCPs),
  • an HRS DEM, used after that to correct distortions due to relief,
  • Quality and traceability data pointing to source imagery and DEMs.
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ANDORRE products
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The images
The data processed by ANDORRE are level 1A SPOT Scenes , from SPOT 1 to 5 satellites, in DIMAP or CEOS format .

The generated images (X) are:

2.5 m 5 m 10 m 20 m ANDORRE
B&W C B&W C B&W C C
SPOT Scene 1A - X - X - - - Merging
2A - X - X - - -
SPOTView 3 X X X X X X X Orthorectification



DEMs
ANDORRE extracts DEMS from Reference3D tiles covering the area of interest.
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ANDORRE technical data
Hardware architecture The ANDORRE hardware architecture supports:
  • supervision of the production shop,
  • Reference3D tile archiving and management (of up to 2,000 tiles),
  • orthorectification and merge processing,
  • quality control of produced images,
  • production on media or over a network.
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- ANDORRE hardware architecture
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- Performances
Performance will depend on the system hardware configuration and on product type and coverage.
In standard configuration, the following performance levels can be expected:



Products Source ANDORRE process Daily production volume
Images* SPOT 1 to 5 Orthorectification Up to 40
SPOT 5 Merging
DEM Reference3D Extraction Up to 20**

*A SPOT scene covers 60 km x 60 km = 3,600 km²
**For areas of interest of about 40,000 km²
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Associated services
- Training
Spot Image offers a training plan tailored to ANDORRE operators’ needs. Training includes theoretical and practical work, focusing on image processing, geometry, Reference3D, and management and maintenance of the automatic orthorectification shop.

3 years’ technical assistance and support
  • on-line support,
  • software upgrades once or twice a year,
  • sharing and exploitation of experience acquired by a network of operators,
  • development of new solutions.
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Key benefits
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Remarkable location accuracy with no need for GCPs
Thanks to Reference3D, ANDORRE products offer exceptional accuracy:
  • planimetric accuracy better than 15 metres (CE90),
  • elevation accuracy better than 10 metres (LE90).
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Perfectly uniform data
Because data are tied to a single reference system (Reference3D), ANDORRE offers temporally and spatially uniform products covering large areas.

A fully automatic and autonomous process
ANDORRE is an automatic production shop designed chiefly to reduce orthoimagery costs and lead times. What’s more, it needs no extra personnel or mapping specialists to operate in routine configuration.
Users can also work in manual mode for greater control over the production process or to check product quality. In this case, some basic knowledge of cartography may be needed to interpret image quality data.

Orthoimage in less than 2 hours
Results obtained so far indicate that ANDORRE takes less than 2 hours to produce a 2.5-m colour, full-scene orthoimage (60 km x 60 km = 3,600 km²).

The same production line as Spot Image
  • Guaranteed quality,
  • The advantage of sharing experience and proposed improvements among an established user community.
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