Hi,
Best bet here is seek advice from EH's aerial survey team and how they
index 'morphed' records interpreted from aerial photos into the National
Monuments Record. I'm sure they must have gone through the various
possibilities.
cheers
Simon Walton
>>> Alison Bennett AAG SMRO ES <[log in to unmask]> 04/12/06
>>>
We do not interpret our cropmarks beyond their form, unless excavation
or
finds have in some way provided some interpretation. So for any area
of
cropmarks which visually are in close proximity, we will record them
using
types such as linear feature, circular enclosure, rectilinear
enclosure,
trackway, and ring ditch; evidence as cropmark; and dating as unknown.
Regards,
Alison Bennett
Team Leader
Essex Historic Environment Record
tel. 01245 437637
e-mail: [log in to unmask]
-----Original Message-----
From: Issues related to Historic Environment Records
[mailto:[log in to unmask]] On Behalf Of Bryant, Victoria (ACS,
Archaeology Unit)
Sent: 04 December 2006 13:51
To: [log in to unmask]
Subject: A general approach to air photo evidence?
Dear All
Please can I have some advice on the best way to record monuments based
on
air photos within the HER/SMR. We have transcriptions of the air
photos
within our GIS but how do we best enter what we see into the record?
The
problems we face are
1. A few cropmarks are distinctive and can be fairly accurately given a
form
and date (for example a Roman fort) but what do you do about circular
features which, whilst they could be prehistoric burials, could also
be
windmill features or search light batteries? Given that most of these
have
no other associated evidence do you make an educated guess or date them
all
from the Bronze Age to the present?
2. Do you separate out types of monuments you can recognise, eg a
circular
ditch, from a maze of otherwise undated and undefined features such as
trackways, blobs and half seen "enclosures"?
3. Do you map cropmarks to the field pattern visible on the air photo,
or
the field pattern now visible, or to the observed extent of the
cropmark?
Any tips on how to produce a clear, consistent index which is useful to
the
general enquirer would be gratefully received
Thanks
Victoria
Victoria Bryant MA MIFA
HER Manager
Worcestershire Historic Environment and Archaeology Service
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