The gradiometric data was collected in 4 different field days.  The first days data had several horizontal lines through it.  Various theories to explain the reason for this include, change in rate of data collection speed and temperature induced drift.  The temperature changed quite a bit and rather rapidly that morning so we were inclined to blame it on drift. The remaining three grids were more consistent throughout.

Data Processing: Magnetometry

Study Area, Hopewell?: | The Geology of the Site | The Archaeology We are Looking For | Data Collection: Magnetometry | Data Collection: Resistivity | Data Processing: Magnetometry | Data Processing:Resistivity | Data Collection: Soil Sampling | Conclusions and Recommendations | Archaeo-Geo Links

GeoPlot (tm)

Each dataset was downloaded in the field and reviewed for consistency before the next grid was collected.  Back in the lab all four grids were downloaded and combined. We ran ‘zero mean traverse’ on the first grid then clipped and despiked the whole set.  Then we began processing to transform our raw data into information by the use various filters provided in ‘GeoPlot’ from Geoscan Research.

There were two kinds of anomalies that we wanted to bring out during processing.  A large positive anomaly in the northeastern portion of our survey area and a number of smaller positive anomalies or ‘spots’ scattered around the eastern half of the survey area.  The spots seem to be arranged in a somewhat circular or arc pattern which might suggest rather large post molds or pits.