Assessment of a ground-based weed mapping system in maize
Weed spatial distribution was measured with a ground-based weed mapping system. The system consists of three different components: i) weed detection by optoelectronic sensors; ii) weed geopositioning by DGPS receiver; and iii) a data acquisition and processing system. Three optoelectronic modules we...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2009 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/243586 |
| Acceso en línea: | http://hdl.handle.net/10261/243586 |
| Access Level: | acceso abierto |
| Palabra clave: | Weed detection Optoelectronic sensors Sampling resolution |
| Sumario: | Weed spatial distribution was measured with a ground-based weed mapping system. The system consists of three different components: i) weed detection by optoelectronic sensors; ii) weed geopositioning by DGPS receiver; and iii) a data acquisition and processing system. Three optoelectronic modules were mounted on the front of a tractor at a 0.75 cm distance between them and at 60 cm height above ground level. Consequently, the system was able to explore a 2.25 m band [isn't that more than one row? This is with all three sensors?], corresponding to three crop rows, detecting the vegetation present in the middle of the inter-rows maize area. The working capacity of the system was higher than 1 ha h-1. The weed mapping system was evaluated in three maize fields during spring, when the crop was [in/at] 4-to-6 leaves stage. In order to verify the system with highly reliable data, digital images were obtained in random geo-referenced points distributed throughout the three fields. Three experienced observers rated these images for weed presence/absence, using a presence threshold of 15% weed cover. The comparison between the data obtained with the ground-weed mapping system and from the values derived from visual assessments of the digital images indicated a good agreement (84% on average) between the two sets of data. The comparison among the results obtained with various simulated distances between sensors (from 1.5 m to 6.0 m) indicated that the ground-based system could construct weed maps accurately using a distance between optic sensors of 4.5 m. |
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