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.coo file extension

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.coo
(Bounding) Coordinates file. Contains information to geo-code an image (showing where the image exists in Cartesian space.)

.coo files are generated and used by AutoCAD, and are also known as cookie files where each cookie file will relate to a single raster file.

A .coo file is a text editable file, and contains the bounding coordinates for a geocoded image/raster file in Cartesian space (for use when for example loading into a mapping system.)

A coo file contains 9 lines, such as:

File name: 5154.tif
File type: TIFF B&W PACKBITS
LLX:       96000
LLY:       133000
URX:       100000
URY:       136000
Resolution 0.2
Columns    20000
Lines      15000

Each line provides the following information:

Line 1: File name The name of the image/raster file. In the example above the image file is a .tif file but it could be other types of image file or a .dwg file.
Line 2: File type  
Line 3: LLX X-Coordinate (or Easting) of the pixel at the lower left corner.
Line 4: LLY Y-Coordinate (or Northing) of the pixel at the lower left corner.
Line 5: URX X-Coordinate (or Easting) of the pixel at the upper right corner.
Line 6: URY Y-Coordinate (or Northing) of the pixel at the upper right corner.
Line 7: Resolution Scale, indicating the effective height/width of each pixel in physical units. In the example above, each pixel corresponds to an area of 0.2m2
Line 8: Columns The width of the image in pixels.
Line 9: Lines The height of the image in pixels.

Can you add to this? Do you know of any applications not already listed which will work with .coo files, view .coo files or open .coo files? Are you able to contribute any additional reference information or file format information about .coo files or have you spotted any errors or omissions? If so please let us know by emailing us at feedback@cryer.co.uk - Thank you.