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GeorefWrither

Related products:Integrations
  • January 12, 2017
  • 2 replies
  • 38 views
M

Hi,

It is often necessary to convert tif with tfw to geotif. Currently FME creates a new image. This is not a problem when there are only a few. It would be a great saving of time and disk space, however, when there are so many, that FME places the tfw information in the tif to make it geotif without rewriting gigabytes (even tera) of data.

The reverse operation: creating worldfiles or georeferencing .tab files without rewriting the images that do not want to duplicate would also be appreciated.

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2 replies

redgeographics
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I'd love to see this too. There used to be a free tool called GeoTiffExaminer that was able to do this. It was developed by a company that got bought out (many years ago) by I believe Autodesk, after that it was sadly discontinued.

For the 2nd part of your suggestion, the structure of a .tfw world file is very simple. Plain text, 6 lines:

  • Line 1: A: pixel size in the x-direction in map units/pixel
  • Line 2: D: rotation about y-axis
  • Line 3: B: rotation about x-axis
  • Line 4: E: pixel size in the y-direction in map units, almost always negative[3]
  • Line 5: C: x-coordinate of the center of the upper left pixel
  • Line 6: F: y-coordinate of the center of the upper left pixel

FME rocks! \m/
M
  • marcandre
  • Author
  • January 18, 2018

GeoTiffExaminer translates the coordination parameters but does not take into account those of the projection. If you open a geotif done in this way, Qgis, for example, will prompt the user to choose in which projection to display this image.

The possibility of assigning a projection to a tif in FME seems to me to be very relevant.

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