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CAD tip CAD tip # 3515:

Question CAD 
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Q - question

What are the .TFW, .JGW or .PGW files?

A - answer TFW, JGW, PGW, BPW, EWW, SDW, etc. are the georeference ('World') files for raster images in TIFF (.TIF), JPEG (.JPG), PNG (.PNG), BMP (.BMP), ECW (.ECW or SID (.SID) file formats.

Autodesk Map (or Raster Design or the GeoRefImg AutoCAD utility) can use these 'World' files directly to place the inserted raster images automatically.

A TFW/JGW file has the same filename as the main image file. It uses a textual (ASCII) format - e.g.:

  
1.50000000000000 (X scale, pixel size in meters)  
0.00000000000000 (affinity - Y-scale in X dir.)  
0.00000000000000 (affinity - X-scale in Y dir.)  
-1.50000000000000 (Y scale)  
1934001.50000000000000 (X coordinate of the upper left pixel)  
1187698.50000000000000 (Y coordinate of the upper left pixel)  
TFW file can be created also automatically - see the IWORLDOUT command in Autodesk Raster Design product or the latest versions of GeoRefImg.
MapCO
100% *  CAD 
5.1.2004    64530x  
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applies to: AutoCAD Map · Raster Design ·

See also:
Tip 9564:What are the .TFWX world files?
Tip 9255:Align image, change width/height independently.
Tip 9139:How to place GeoTIFF images automatically to right positions?
Tip 7087:How to reconstruct a world file from a raster image?
Tip 6802:Draping an aerial image on a Civil 3D terrain surface.


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