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Change Detection

This is a processing block that detects changes on 512x512 GeoTIFF images

Description

Infrastructure Change Detection, based on SPOT or Pléiades imagery, detects changes in man-made infrastructures such as roads, buildings and houses, earthworks, etc. It is intended for urban development monitoring.

Technical description

Assuming tiled SPOT or Pléiades images as an input, the Change Detection algorithm uses models based on deep learning methods to automatically provide a binary change / no change report as an output.

Use cases

The main objective of change detection is to help image analyst to focus on specific location and thus prioritize their activities and deliver faster reports. It can also be used to measure the surface that has changed and thus provide statistics at the level of a county or city. Possible use cases: urban development, maps/databases update, conflict areas monitoring, illegal activities monitoring, etc.

Note: This block currently fails if less or more than two images are given. Set the following parameters to run it successfully with Pléiades / SPOT:

  • limit set to 2
  • contains filter instead of intersects or bbox
  • match_image_extents (tiling) set to True
General InformationDescription
Supported input dataInput tile size between 256x256 and 1024x1024 pixels. Compatibility with jpg, png, 3 or 4 bands, tif 3 or 4 bands (8 bits RGB), Resolution 2.4 m, Image padding 32
Output data formatGeoJSON vector file in geographic projection containing all changes as polygons
PerformanceAlgorithm qualified on a large set of data encompassing different types of landscapes worldwide by Airbus R&D and operational team, with a high level of recall performance. High recall but low precision, so results might contain a significant amount of over detections. Works better with images of the same season, no snow and restrained angles on dense cities and high buildings.
Machine TypeGPU

Capabilities

Input Capabilities

raster
custom
match_extents
true
up42_standard
dtype
uint8
format
{
  "or": [
    "GTiff",
    "PNG",
    "JPEG"
  ]
}
tile_width
{
  "or": [
    256,
    512,
    768,
    1024
  ]
}
tile_height
{
  "or": [
    256,
    512,
    768,
    1024
  ]
}

Output Capabilities

vector
custom
object_type
change
up42_standard
format
GeoJSON
geometry_type
Polygon

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