Creation of Three-dimensional Crop Maps based on Aerial Stereoimages

Rovira-Más, Francisco; Zhang, Q.; Reid, John F.

doi:10.1016/j.biosystemseng.2004.11.013

Cited by 55 publications

(20 citation statements)

References 4 publications

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“…Other authors have presented the development of a remote-sensing aerial platform for general mapping purposes [19]. 3D-GIS map generation employing UAVs have also been discussed in [20,21]. Furthermore, cooperative remote sensing for real-time water management and irrigation control with small UAV is proposed in [22].…”

Section: Introductionmentioning

confidence: 99%

An Air-Ground Wireless Sensor Network for Crop Monitoring

Valente

Sanz

Barrientos

et al. 2011

Sensors

151

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This paper presents a collaborative system made up of a Wireless Sensor Network (WSN) and an aerial robot, which is applied to real-time frost monitoring in vineyards. The core feature of our system is a dynamic mobile node carried by an aerial robot, which ensures communication between sparse clusters located at fragmented parcels and a base station. This system overcomes some limitations of the wireless networks in areas with such characteristics. The use of a dedicated communication channel enables data routing to/from unlimited distances.

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Section: Introductionmentioning

confidence: 99%

An Air-Ground Wireless Sensor Network for Crop Monitoring

Valente

Sanz

Barrientos

et al. 2011

Sensors

151

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“…D may be obtained through simple geometric calculations, based on direct measurements, or using aerial photographs and geographical information systems (Rovira-Más et al, 2005).…”

Section: Crop and Crop Growth Coefficientsmentioning

confidence: 99%

Computer-assisted sizing of photovoltaic systems for drip irrigation of olive orchards in semi-arid climate

Moral

Rodríguez

Cuadrados

et al. 2009

Span. j. agric. res.

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One of the most promising applications of photovoltaic solar power, especially in areas which have high levels of solar radiation, is for pumping the water needed to irrigate the existing crops. However, it is absolutely necessary to accurately dimension the installations due to the high prices of photon capture devices. In this paper, a simple method, implemented in a spreadsheet, to calculate the design requirements of a photovoltaic system to power the drip irrigation of a field is proposed. The methodology is based on the link between the existing photovoltaic pumping techniques and the procedure to determine the crop water requirements. In the case study, 10 ha of olive grove, a photovoltaic field with 18 solar panels for 1.43 kWp is required. Besides the advantages for the environment, since it uses a renewable energy, a study on the economic viability of a photovoltaic system shows that it is similar to conventional systems which use a generator unit (twice the net present value for the photovoltaic system). Moreover, the high price of fossil fuels guarantees a progressive advantage of photovoltaic systems.Additional key words: crop water requirements, irrigation scheduling, renewable energies, solar panels, spreadsheet. ResumenDimensionamiento asistido por ordenador de sistemas fotovoltaicos para riego por goteo de olivares en climas semiáridos Una de las aplicaciones más prometedoras de la energía solar fotovoltaica, especialmente en áreas con niveles elevados de radiación solar, es el bombeo del agua necesaria para regar los cultivos. Sin embargo, es absolutamente necesario dimensionar de forma precisa las instalaciones, debido al alto precio de los sistemas de captura fotónica. En este trabajo se propone un método simple, implementado en una hoja de cálculo, para calcular los parámetros de diseño de un sistema fotovoltaico capaz de suministrar la energía que precise un sistema de riego por goteo de una parcela agrícola. El método se basa en la unión de las técnicas conocidas para el bombeo fotovoltaico y para el cálculo de las necesidades hídricas de un cultivo. En el caso estudiado, con 10 ha de olivar, es necesario un campo fotovoltaico con 18 paneles solares para 1,43 kWp. Aparte de las ventajas medioambientales, ya que se emplea energía renovable, un estudio adicional demuestra la viabilidad económica de un sistema fotovoltaico, con unos costes similares a los sistemas convencionales consumidores de combustibles fósiles (más del doble de valor actualizado neto para el sistema fotovoltaico). Además, el precio cada vez más elevado de los combustibles hace que los sistemas fotovoltaicos sean una opción cada vez más ventajosa.Palabras clave adicionales: energías renovables, hoja de cálculo, necesidades hídricas de un cultivo, paneles solares, programación del riego.

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“…For in-field operations, it has been successful for imaging at larger scales, for example Kise and Zhang (2008) and Blas (2010) used it for guidance and navigation in the fields. Rovira-Más et al (2005) used aerial stereo images for growth estimation. Use of stereo vision for corn plant space sensing both indoor and outdoor has been demonstrated by Jin and Tang (2009).…”

Section: Stereo Vision In Agriculturementioning

confidence: 99%

Indoor and outdoor depth imaging of leaves with time-of-flight and stereo vision sensors: Analysis and comparison

Kazmi

Foix

Alenyà

et al. 2014

ISPRS Journal of Photogrammetry and Remote Sensing

115

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In this article we analyze the response of Time of Flight cameras (active sensors) for close range imaging under three different illumination conditions and compare the results with stereo vision (passive) sensors. Time of Flight sensors are sensitive to ambient light and have low resolution but deliver high frame rate accurate depth data under suitable conditions. We introduce some metrics for performance evaluation over a small region of interest. Based on these metrics, we analyze and compare depth imaging of leaf under indoor (room) and outdoor (shadow and sunlight) conditions by varying exposures of the sensors. Performance of three different time of flight cameras (PMD CamBoard, PMD CamCube and SwissRanger SR4000) is compared against selected stereo-correspondence algorithms (local correlation and graph cuts). PMD CamCube has better cancellation of sunlight, followed by CamBoard, while SwissRanger SR4000 performs poorly under sunlight. stereo vision is more robust to ambient illumination and provides high resolution depth data but it is constrained by texture of the object along with computational efficiency. Graph cut based stereo correspondence algorithm can better retrieve the shape of the leaves but is computationally much more expensive as compared to local correlation. Finally, we propose a method to increase the dynamic range of the ToF cameras for a scene involving both shadow and sunlight exposures at the same time using camera flags (PMD) or confidence matrix (SwissRanger).

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Creation of Three-dimensional Crop Maps based on Aerial Stereoimages

Cited by 55 publications

References 4 publications

An Air-Ground Wireless Sensor Network for Crop Monitoring

An Air-Ground Wireless Sensor Network for Crop Monitoring

Computer-assisted sizing of photovoltaic systems for drip irrigation of olive orchards in semi-arid climate

Indoor and outdoor depth imaging of leaves with time-of-flight and stereo vision sensors: Analysis and comparison

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