In 2006 a grid system was established for the excavations and surveying in Vescvado di Murlo. An origin point (0 north-south, 0 east-west) was placed and marked within the exposed forno features by the center support; likewise the absolute elevation of this area was established relative to its height above sea level (ASL). In 2015, and again this season in 2016, the areas being excavated will continue to use these points.
As in 2015 note that the trenches this season are also situated on a disused tennis court and have been laid out parallel and perpendicular to the boundaries of the court; consequently, they are not perfectly parallel or perpendicular to the areas investigated in 2006 and not set at right angles to north-south/east-west lines, or at perfect meter-marks.
Consequently the following formula was employed to calculate the coordinates of the trenches in 2016. These were based on the pre-known points of the trenches established in 2015 with a Total Station.
Where E and F are known points and X and Y are known distances. To find D.
D= (E-F) x X + E
In order to take coordinates for finds a north-south baseline at 18W and east-west baseline at 9S was laid out by site surveyor, Andrew Carroll. The same datum point as 2015 is being employed; it is 306.21m A.E./A.S.L.
Using the southern baulk of VT 13 a hard tape was pulled between the 2 corners and a nail was placed 2 \xbd meters from the center point of all the trenches. Using the western baulk of VT-12 a hard tape was pulled between these 2 points and a nail was placed 3 \xbd meters from the center point. The coordinates of VT-14 were found using the 2 baselines. The northeast corner was established using the above formula.
NW= 21.59 W, 4.64 S
NE= 19.15 W, 4.91 S
SE- 18.40 W, 7.53 S
SW- 20.84 W, 8.05 S
E= (-19.35+19.96/3) *1 -19.35= -19.15
N= (-3.74+.22/3) *1 -3.74= -4.91
|Property or Relation||Value(s)|
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