Archaeology Underwater: The NAS Guide to Principles and Practice
POSITION-FIXING 95 If several GPS points are laid over a site-plan, for exam- ple, errors may be encountered over and above the ...
the selected area. Unfortunately 100 per cent is difficult to define in this context due to the varying degrees of efficiency fo ...
UNDERWATERSEARCH METHODS 97 could include carrying out a dry run (plate 12.1) to help perfect diver positioning, communications ...
98 UNDERWATERSEARCH METHODS Many dive-computers have audible alarms to alert the diver in the event of a rapid ascent. In condit ...
UNDERWATERSEARCH METHODS 99 Plotting the position of observations during the search can be achieved in the same way as described ...
100 UNDERWATERSEARCH METHODS extend the length of these with about 2 m (6 ft) of elas- tic cord (‘shock cord’ or ‘bungee-cord’). ...
UNDERWATERSEARCH METHODS 101 replaced by letters to help those inexperienced in the use of coordinates as a way of expressing a ...
102 UNDERWATERSEARCH METHODS Hand-held metal-detectors must be used systemat- ically if they are to be an effective search tool. ...
summarizes a range of geophysical instruments and techniques that can be useful in an underwater archae- ological project, inclu ...
104 GEOPHYSICAL AND REMOTE-SENSINGSURVEYS deployed and the nature of the sea-bed and environ- mental factors. For instance, in 1 ...
GEOPHYSICAL AND REMOTE-SENSINGSURVEYS 105 visually monitored and readings noted manually. Alter- natively, sophisticated instrum ...
106 GEOPHYSICAL AND REMOTE-SENSINGSURVEYS perhaps cover a track 55 m wide. When coupled with the exceptionally good vertical acc ...
GEOPHYSICAL AND REMOTE-SENSINGSURVEYS 107 (sea-bed discrimination) systems. Most are based on single-beam ‘profile’ technology a ...
108 GEOPHYSICAL AND REMOTE-SENSINGSURVEYS and metals are better reflectors than finer grained sedi- ments and will therefore be ...
GEOPHYSICAL AND REMOTE-SENSINGSURVEYS 109 many archaeological sites coincide with areas of high sedimentation. This can result i ...
110 GEOPHYSICAL AND REMOTE-SENSINGSURVEYS Figure 13.4 A two-dimensional profile and interpolated timeslice of the Grace Dieu(143 ...
GEOPHYSICAL AND REMOTE-SENSINGSURVEYS 111 material or by comparison with standard empirically derived values), this cross-sectio ...
112 GEOPHYSICAL AND REMOTE-SENSINGSURVEYS anchors, chains, cables and ordnance with large magnetic signatures can effectively ma ...
GEOPHYSICAL AND REMOTE-SENSINGSURVEYS 113 300 m (975 ft). AUVs, as their name suggests, are autonomous systems that function wit ...
Types of Survey Surveys on archaeological sites can broadly be divided into four types: 1 assessment survey; 2 recording survey ...
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