89
Data will be acquired utilising the Grad601 gradiometers over a series of 30m x 30m survey grids. Separation between lines will be 1m, and data will be collected along line at no greater than 0.25m intervals.
90
The survey will be conducted within a discrete parcel of land. Data will not be collected whilst crossing field boundaries. Where survey grids would cross a field boundary or other obstruction, partial grids will be used.
91
Coloured flags may be used to mark the locations of completed grids. Once all data has been collected and quality checks performed any markers will be removed from the field and all equipment and personnel will leave the working area. Wooden pegs/canes and coloured flags may remain on the site for a few days, depending upon the time required to collect and review the data in each section.
Data processing 92 93
Field processing will be performed on the data at the end of each day of field survey. This processing is undertaken primarily to check data quality.
Data will be sent from the field team for full office-based processing. Processing will be undertaken using, but not limited to Geoplot, ArcheoSurveyor or Geosoft’s Oasis Montaj software.
94 Processing involves:
• • • • •
95
De-stagger to correct positional offsets De-spiking, and removing anomalous values Filtering to enhance signals of interest in the data Heading error corrections (de-striping as required) Edge Matching, Merging sensors, and datasets.
Data images are exported from processing software and imported into CAD for reporting and visualisation purposes. The objective account of the evidence will be clearly distinguished from its archaeological interpretation.
Outline Written Scheme of Investigation: Archaeology and Cultural Heritage (Onshore) Rev 01
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