It was a hot and sunny day in Verulamium Park, but we had a good turn out with John Dent, Jon Wimhurst, Mike Smith, Jim West, Sarah Adamson and Jean Savigar. It was a day of fiddly partial grid squares which are much slower than simple whole ones, and a lot of grid laying-out ready for Saturday when we will be surveying while the Magna Carta celebrations go on in the next field.
Unfortunately, this is the area where the 12″ gas main cuts across the site. Something that big not only blitzes the results, but also has an impact on the destriping process in the software. I have, therefore, taken the ugly but expedient step of just replacing all the very high and very low values with dummy readings. It makes for an ugly looking map but it works for now.
As you can see, the biggest and clearest feature on our map is Watling Street, running into the forum which lies under the church, vicarage and school playing field. Ralph Potter has helpfully scanned one of the maps of Verulamium and created a kmz file that I can overlay on the geophysics results. The fit isn’t perfect, as the original map was a small scale illustration, but it is good enough as a guide to what is happening.
As you can see the GPR timeslice doesn’t appear to show the road after all. I wonder what that feature is? It is useful to zoom in a little.
This image shows just how much we have added to the plan of Verulamium. The plan of Insula XXIV only shows two small fragments of buildings, whereas the survey has helped add many more buildings to that plan.
We will be in the Park on Saturday. Come and join in, or least come and say hello!