Title Description Size Download British Freedom Shipwreck near Halifax, Nova Scotia. Data provided courtesy of the Ocean Mapping Group, University of New Brunswick. 0.2 MB small.zip Oahu A scene consisting of two DTMs used in a geological survey - one showing part of a volcano and the other showing the sea floor. From Oahu, Hawaii. Data provided courtesy of Dr. Jim Gardner (USGS). 3.3 MB usgs_oahu.zip Feature Scene containing a DTM of Portsmouth harbor, New Hampshire. Overlaid on the surface are a number of small DTMs created from sidescan sonar images. Data courtesy of the Shallow Survey Conference Common Data Set 2001 (CCOM - UNH). 7.1 MB feature.zip Three Three DTMs of the same region placed side by side in a scene. One DTM is colored by height, one using a backscatter image, and one using the gradient of the surface. Data courtesy of the Shallow Survey Conference Common Data Set 2001 (CCOM - UNH). 9.1 MB three.zip Shorecam Large scene of the area around Portsmouth Harbor, New Hampshire. Shows a height-mapped DTM of the harbour surrounded by a DTM consisting of a high-resolution aerial photograph draped onto a low-resolution terrain. Also contains two vertical images which show views of the harbour as seen from a ship (ShoreCam). Data courtesy of the Shallow Survey Conference Common Data Set 2001 (CCOM - UNH). 18.2 MB shorecam.zip