Providing an archaeological bird's‐eye view – an overall picture of ground‐based means to execute low‐altitude aerial photography (LAAP) in Archaeology

Verhoeven, Geert

doi:10.1002/arp.354

Cited by 132 publications

(101 citation statements)

References 51 publications

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“…As such, the current method enables the discrimination between leaves and other objects by simultaneous binarization of multiple digital photographs multi-temporally acquired under different brightness levels. In this context, other related gadgets such as balloons may offer practical alternatives for the consecutive quantification of leaf area in agricultural fields and other areas (Verhoeven, 2009;Zhang & Kovacs, 2012). Thus, the use of R/G and a* as the indices for the determination of plant leaf area is worthy of consideration.…”

Section: Discussionmentioning

confidence: 99%

Detection of Cassava Leaves in Multi-Temporally Acquired Digital Images of a Cassava Field Under Different Brightness Levels by Simultaneous Binarization of the Images Based on Indices of Redness/Greenness

Srisutham¹,

Doi²,

Polthanee³

et al. 2014

MAS

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Plant leaf area reveals various types of abnormalities which can enable appropriate plant/crop management actions. The quantification of plant leaf area is now feasible using commonly available digital photographing tools. Changes in brightness, however, make it difficult to compare leaf areas in digital photographs acquired at multiple time points. This difficulty could be overcome by employing an index of redness/greenness (R/G), which was suggested to be one of the best indices to discriminate between plant leaves and other objects such as soils. R/G and other indices were examined when discriminating cassava leaves from other objects in a field. A surveillance camera captured digital photographs on a daily basis. Of these, 183 photographs were stored. They were pasted into a single image file and simultaneously analyzed. The International Commission on Illumination color model's a* was the best index in the discrimination, with a distinctiveness score of 1.36. R/G was the second best, with a distinctiveness score of 0.70. The percentage of leaf-likely pixels followed sigmoidal patterns with time, resulting in great coefficients of determination of 0.981 (a*) and 0.965 (R/G). The percentage of leaf-likely pixels and cassava leaf weight had a real-time response relationship. The range of the 95% confidence limit was narrowed from -16 to +14% of a predicted value of 98% leaf-likely pixels for R/G to ±12% for a*. Thus, the simultaneous binarization and the detection of leaf-likely pixels in the photographs acquired under different brightness levels was enabled with improved discrimination accuracy by employing a*.

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Section: Discussionmentioning

confidence: 99%

Detection of Cassava Leaves in Multi-Temporally Acquired Digital Images of a Cassava Field Under Different Brightness Levels by Simultaneous Binarization of the Images Based on Indices of Redness/Greenness

Srisutham¹,

Doi²,

Polthanee³

et al. 2014

MAS

View full text Add to dashboard Cite

show abstract

“…Also, a uav can be very costly compared with the other platforms. Though, uav's have been proven to work very well in other parts of the world (Verhoeven, 2009;Hendrickx et al, 2011).…”

Section: Uavmentioning

confidence: 99%

“…One only needs photographs of the site with ample ground resolution, which in general means that the photographs have to be taken from a low altitude above the ground. In archaeology there are various platforms in use such as balloons, kites and unmanned aerial vehicles (uav's) from which low altitude aerial photographs can be taken that have been proven to work (Verhoeven, 2009). All have their specific advantages above others in different circumstances, mainly dependent on wind conditions and the platforms' logistical needs.…”

Section: Introductionmentioning

confidence: 99%

Low cost 3D-modelling of a complex archaeological site using aerial photography in the hinterland of Petra, Jordan

Emaus

Goossens

2015

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Individual archaeological sites can sometimes show a complex morphology. One such site is the Roman quarries located one kilometre northwest of the Roman fortress at Udhruh, in the hinterland of Petra. In archaeology there are various platforms such as balloons, kites and unmanned aerial vehicles (uav's) from which low altitude aerial photographs can be taken that have been proven to work. All with their specific advantages above others in different circumstances. By designing a very distinct setup for the kite and optimizing the workflow accordingly, an effective and steady platform for the camera was created. The Quarries were photographed from the air and the images then provided enough material to accurately create a 3D model of the site.

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“…Some applications of these include monitoring archaeological sites (Verhoeven, 2009), coral aerial photography (Scoffin, 1982), humanitarian emergency mapping (Sklaver et al, 2006), mapping intertidal landscapes (Bryson et al, 2013), and an intelligent kite aerial platform (Murray et al, 2013), etc.. While balloons operate well under low wind conditions, the kites are usually flown in windy conditions, thus offering a complimentary use in varying weather.…”

Section: Introductionmentioning

confidence: 99%

A Low Cost Rokkaku Kite Setup for Aerial Photogrammetric System

Khan

Khurshid

Yousuf

2015

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Orthogonally Projected Area (OPA) of a geographical feature has primarily been studied utilizing rather time consuming field based sampling techniques. Remote sensing on the contrary provides the ability to acquire large scale data at a snapshot of time and lets the OPA to be calculated conveniently and with reasonable accuracy. Unfortunately satellite based remote sensing provides data at high cost and limited spatial resolution for scientific studies focused at small areas such as micro lakes micro ecosystems, etc. More importantly, recent satellite data may not be readily available for a particular location. This paper describes a low cost photogrammetric system to measure the OPA of a small scale geographic feature such as a plot of land, micro lake or an archaeological site, etc. Fitted with a consumer grade digital imaging system, a Rokkaku kite aerial platform with stable flight characteristics is designed and fabricated for image acquisition. The data processing procedure involves automatic Ground Control Point (GCP) detection, intelligent target area shape determination with minimal human input. A Graphical User Interface (GUI) is built from scratch in MATLAB to allow the user to conveniently process the acquired data, archive and retrieve the results. Extensive on-field experimentation consists of multiple geographic features including flat land surfaces, buildings, undulating rural areas, and an irregular shaped micro lake, etc. Our results show that the proposed system is not only low cost, but provides a framework that is easy and fast to setup while maintaining the required constraints on the accuracy.

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Providing an archaeological bird's‐eye view – an overall picture of ground‐based means to execute low‐altitude aerial photography (LAAP) in Archaeology

Cited by 132 publications

References 51 publications

Detection of Cassava Leaves in Multi-Temporally Acquired Digital Images of a Cassava Field Under Different Brightness Levels by Simultaneous Binarization of the Images Based on Indices of Redness/Greenness

Detection of Cassava Leaves in Multi-Temporally Acquired Digital Images of a Cassava Field Under Different Brightness Levels by Simultaneous Binarization of the Images Based on Indices of Redness/Greenness

Low cost 3D-modelling of a complex archaeological site using aerial photography in the hinterland of Petra, Jordan

A Low Cost Rokkaku Kite Setup for Aerial Photogrammetric System

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