Difference between revisions of "IRAP grid"

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Revision as of 15:33, 8 January 2021

This article is about Petrel's version of the IRAP ASCII grid data format. These usually have the extension .fgr or .dat but this is not diagnostic.

The raster format describes a regularly sampled grid, representing a map for example.

Structure

This is currently a guess; if you have better information please edit this article.

  UNKNOWN NROWS  DY    DX
  XMIN    XMAX   YMIN  YMAX
  NCOLS   ROTATION?    ROTX?   ROTY?
  0   0   0   0   0   0   0
  DATA1   DATA2   DATA3   DATA4   DATA5   DATA6
  DATA7   DATA8   DATA9   DATA10  DATA11  DATA12
  DATA13  DATA14  DATA15  DATA16  DATA17  DATA18
  ⋮

Unknown elements are marked as such; a ? means this interpretation is uncertain.


Example

  -996   321     12.500492     12.500015
   440949.280762   447949.556152  6468415.483154  6472415.488037
   561       89.147209   440949.280762  6468415.483154
     0     0     0     0     0     0     0
    1886.1649    1886.1562    1886.1442    1886.1310    1886.1180    1886.1094
    1886.1006    1886.0881    1886.0730    1886.0573    1886.0337    1885.9985
    1885.9467    1885.8665    1885.7692    1885.6562    1885.5387    1885.4366
    1885.3225    1885.1807    1885.0006    1884.7522    1884.4805    1884.2197
    1883.9696    1883.7412    1883.5377    1883.3629    1883.2299    1883.1602
    1883.1271    1883.1204    1883.1174    1883.0812    1883.0444    1883.0229


See also