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Archaeological Prospection
Title
The title of the publication or report
Title:
Archaeological Prospection
Series
The series the publication or report is included in
Series:
Archaeological Prospection
Volume
Volume number and part
Volume:
18 (4)
Publication Type
The type of publication - report, monograph, journal article or chapter from a book
Publication Type:
Journal
Year of Publication
The year the book, article or report was published
Year of Publication:
2011
Source
Where the record has come from or which dataset it was orginally included in.
Source:
BIAB (biab_online)
Relations
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Relations:
URI:
http://onlinelibrary.wiley.com/doi/10.1002/arp.v18.4/issuetoc
Created Date
The date the record of the pubication was first entered
Created Date:
03 Aug 2012
Please click on an Article link to go to the Article Details.
Article Title
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Page
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Abstract
Balancing on the Borderline '“ a Low-cost Approach to Visualize the Red-edge Shift for the Benefit of Aerial Archaeology
Geert Verhoeven
Michael Doneus
267 - 278
Scientists from different research disciplines have provided essential information that relates the biophysical characteristics of plants to their spectral reflectance. This fundamental understanding has facilitated the development of various non-destructive sensing methods for detecting vegetation stresses, monitoring plant growth and calculating crop yield. Aerial archaeologists flying in small aeroplanes have only partially exploited this knowledge. Instead of basing archaeological interpretation on only direct visual inspection of the conventionally acquired colour photographs, this contribution briefly reviews the reflectance properties of plants and uses them to present a new low-cost imaging technique beneficial for the detection of (faint) archaeologically induced vegetation marks. The new approach consists of three simultaneously operated digital still cameras, each of them capturing information in a different spectral waveband: the visible, near-infrared and red-edge spectral region. The latter two bands are used in the calculation of a R700/R800 vegetation index. Besides a theoretical underpinning, real-world examples will assess the potential of this new approach in detection of vegetation marks and prove that this low-cost, multispectral method might be beneficial in identifying and enhancing weak crop stresses that are lost when taking only the broad visible spectrum into account. In the final discussion, some thoughts on future archaeological aerial research are given.
A Generic Toolkit for the Visualization of Archaeological Features on Airborne LiDAR Elevation Data*
Keith C Challis
Paolo P Forlin
M Kincey
279 - 289
A range of techniques have become established for the visualization and analysis of airborne LiDAR elevation data within the field of archaeology. In this paper we discuss the visualization of test data representing archaeological features in a variety of terrains using a suite of techniques, all available through generic geographical information system or image processing software. These comprise elevation shading using constrained colour ramps, slope analysis, hill-shading, principal component analysis of multi-azimuth hill-shading, local relief models and solar insolation modelling. The strengths and weaknesses of each technique are discussed and a generic toolkit, suited to the visualization of airborne LiDAR data for archaeological purposes, is presented.
Problems and Solutions with GPR Data Interpretation; Depolarization and Data Continuity
J Leckebusch
303 - 308
When interpreting large area ground-penetrating radar (GPR) surveys it has been found that the depolarization of electromagnetic waves affects the reflectivity of some subsurface features, which has a larger effect on detectability than previously thought. This depolarization can make some archaeological structures almost invisible using standard processing steps including reflection profiles and energy slice maps. Only recording data with orthogonal antenna orientation will eliminate this problem. After three-dimensional interpretation of three-dimensional volumes of GPR reflections a variable width gap between floors and their bounding walls has been repeatedly observed. This newly detected problem is clearly visible in a number of surveys conducted at a Roman town in Switzerland. It is explained by the distorted geometry of the sides of the floors common in the Roman Empire, resulting in a reflection surface that reflects most energy away from the surface antennae and only limited energy is recorded, making portions of the floors invisible.