.JGW File Extension
What is a JGW file?
Georeference file used by GIS products such as ESRI ArcGIS Desktop; stored in plain text and contains the coordinates for a corresponding raster .JPG image; used for referencing the location of aerial view maps; can be tiled with other JPEG world images.
JGW files specify the scale of the image per pixel as well as the (X,Y) coordinate of the upper left pixel. Using this information, the actual geographical area of the image can be reconstructed.