Raster/ESRI Worldfile
A file format for associating geographical point data with bitmapped image files, allowing assignment of geo-coordinate information to a map or other image file.
- World files consist of sets of point data consisting of six lines each, denoting the following:
- Line 1: (size in pixels in x direction)
- Line 2: (rotation term for row)
- Line 3: (rotation term for column)
- Line 4: (size in pixels in y direction)
- Line 5: (x coordinate of centre of upper left pixel in map units)
- Line 6: (y coordinate of centre of upper left pixel in map units)
- The World file format is always associated with a bitmap or raster image file. There are many of these image formats and all will be supported by NADCON, since processing is identical for all. The image file itself is unchanged. The text file containing the geographic coordinate data is assigned a new file extension, depending on the original file type.