Spinning our wheel

Jon Wimhurst and Jim West turned out on the wet and drizzly morning to continue our survey of Verulamium Park.  Luckily, the weather cheered up as promised and by the afternoon it was pleasantly sunny if a little windy.

Two other thanks are due.  Firstly, to Roger Miles for making our “wheel spinner”, see the image below.  One of the annoying quirks of the Foerster system is the lack of an “end line” command for partial grid squares.  In order to get around that we have to spin the odometer wheel and fool it into thinking we have gone the distance.  We can then replace those values in TerraSurveyor with dummy readings.

Using the new wheel spinner.

Using the new wheel spinner.

Mention of TerraSurveyor brings up the second set of thanks.  David Wilbourn has modified his program so that we can have absolute cut-off values in the destriping routine which makes dealing with the dreaded pipeline much easier.  Thanks David!  (The images below were created with the older version of the program.)

We managed 11 grid squares today, although one of those was a 10 x 40m sliver to replace the part of the grid with the frozen sensors from Tuesday.  Now that the red herring of the vanishing goal posts has been dispensed with, we have filled in the gaps and made the whole thing look a little more sane.  I’ve been a bit lazy in the image below and haven’t yet masked off the stripy bits from our wheel spinning exercise,

The survey as of 9th August 2013.

If we zoom into the south-eastern area more closely we can see the detail a little better,  The road shows up nicely, as does the 1955 ditch which interestingly hardly shows to the east of Watling Street.  The famous triangular temple just shows as a triangle of noise.  I guess that is the impact of the backfilled excavation.  I wonder what Sir Mortimer did differently there as the other trenches aren’t quite so opaque?

The south eastern area near the London Gate.

The south eastern area near the London Gate.

Lastly, the same image but with Ralph’s scan overlaid on it.  The registration between the plan and the archaeology isn’t perfect but it is useful nonetheless.

The same image as above but with the plan of Verulamium overlain on it.

The same image as above but with the plan of Verulamium overlain on it.

We’re out in the Park again tomorrow.  We may be moving on to another site next week depending on the crops.

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