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CAD tip CAD tip # 3515:

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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.
100% *  CAD 
5.1.2004    92095×  
applies to: AutoCAD Map 3D · Raster Design ·

See also:
Tip 12914:Geo2GPS - web map from any coordinate of an AutoCAD DWG.
Tip 12881:How to attach multiple raster images to my DWG in one go?
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?

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