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.
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