Montoito, Portugal

Montoito, Portugal

Fig. 1: Satellite images of Montoito – the site is visible in soil marks (?) and mainly situated in a former wine-yard (historical images of Google earth from 22/6/2003). 

 

Fig.2a:  Magnetogram of Montoito 12/2013; line-mean for correction of external geomagnetic noise; spatial data               

correction by destaggering and manual corrections; dynamics -+30 nT in 256 greyscale (white / black); 40m-grids; North upwards.

Fig.2b: Magnetogram of Montoito 12/2013; highpass filter with 10x5 pixel matrix; dynamics -/+ 20 nT in 256 greyscale (withe/black); 40m-grids

Fig.2c: Montoito 12/2013 final Magnetogram; overlay of highpass-filtered data on total field data from Fig.2a with transparency of 36 %; dynamics -/+ 30 nT in 256 greyscale (withe/black), 40m-grids, North upwards

Fig.3: Reconstruction of the ellipse of Montoito with Azimuth = 120°on the basis of the historical Google earth image from 22/6/2003.

Fig.4: Reconstruction of the ellipse of Montoito and the directions (Azimuth) of several sight lines on the base of the final magnetogram from Fig.2c