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If you want to understand the Dimensionally Extended nine-Intersection Model (DE-9IM) or Clementini Matrice, read Christian Stobl Dimensionally Extended Nine-Intersection Model (DE-9IM)(pdf). You can also read the explications in PostGIS: 4.3.6. Dimensionally Extended 9 Intersection Model (DE-9IM) The method allows to create spatial filters to find ...

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