Raw DIDSON files are stored in DDF format. DIDSON owners can read and analyze these files using Sound Metrics software (DIDSON Control and Display; http://www.soundmetrics.com/products/didson-sonars/software). Matlab users can read and analyze DDF files using non-proprietary scripts from Sound Metrics to import raw DIDSON data (http://www.soundmetrics.com/support/forums/software-questions). Each DIDSON image frame is stored as a Matlab array for further processing. Echoview (http://www.echoview.com/) software can also be used to read and analyze DDF files.