*.aoi.
An Area of Interest file. Used to hold a point, line, or polygon that is selected as a training sample or as the image area to be used in an operation.

*.blk.
An IMAGINE OrthoBASE block file. An IMAGINE OrthoBASE block file can contain only one image. A block file that contains two or more images with approximately 60% overlap can be viewed in stereo in other applications such as Stereo Analyst.

*.cam.
An ASCII file with a fixed structure. Provides camera information such as focal length and principal point.

*.dat.
An ASCII file. In IMAGINE OrthoBASE, exterior orientation parameters are often contained in a .dat file. Typically, this data comes from the airborne GPS or INS used during image capture. See also: Airborne GPS; Inertial Navigation System

*.img.
An ERDAS IMAGINE image file. Data in the .img format are tiled data, which can be set to any size. A file containing raster image data. An .img file contains data such as sensor information, layer information, statistics, projection, pyramid layers, attribute data, etc.

*.shp.
An ESRI shape file. Shape files are in vector format, and can store attribute data.

*.txt.
An ASCII text file. Frequently used as an input GCP reference source for 2- and 3-dimensional control point and check point coordinates.

*.tif.
Tagged-Image File Format (TIFF) is used mainly for exchanging documents between different applications and different computer platforms.

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