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Question

what does mean _cell_origin_x 0.5 in raster information

  • March 14, 2013
  • 3 replies
  • 15 views

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Hi,

 

 

Does some people know what does mean _cell_origin_x = 0.5 in raster information?

 

 

This is not the pixel size because the pixel size of my image is 0.2.

 

 

Thank for your help
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3 replies

fmelizard
Safer
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  • Safer
  • March 14, 2013
Hi,

 

The pdf from this article explains most of the FME terms use with rasters, the _x_spacing and _y_spacing correspond to pixel size.

 

Hope this helps 

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  • March 15, 2013
Directly from the FME Advanced Course:

 

 

Raster Origins and Extents For an entire raster dataset, the origin point is the upper left corner (A). The extents of a raster are the lower left X and Y of the lower left cell, to the upper right X and Y of the upper right cell (B) . For individual cells, 0.0, 0.0 is the lower left corner of the cell, and 1.0, 1.0 is the upper right corner. The origin point is usually the cell centre; 0.5, 0.5 (C). This is the cell origin that FME uses.

 

 

There's a pretty picture accompanying the description too but I hope this by itself helps.

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  • Author
  • March 15, 2013
Thanks Itay and Kathy for your answer