Difference between revisions of "Productivity Maps"

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(New page: == Management Zones == === Overview === Management Zones maps are generated based on the combination of Vegetation Index maps, through a process called 'cluster analysis'. It's also pos...)
 
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== Management Zones ==
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=== Overview ===
  
=== Overview ===
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Management Zones maps are generated based on the combination of Vegetation Index maps, through a process called 'cluster analysis'. It's also possible to include information from previous yield monitor maps if available. 
  
Management Zones maps are generated based on the combination of Vegetation Index maps, through a process called 'cluster analysis'. It's also possible to include information from previous yield monitor maps if available. 
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This is a procedure relatively simple, automated and objective, that allows to compare the field production and variability in different times, in a single map. Remote sensing imagery is selected in key dates, when crops are vigorous, and Vegetation Index (NDVI) maps are generated on those dates. These layers are then normalized, and integrated in the management zone map.  
  
This is a procedure relatively simple, automated and objective, that allows to compare the field production and variability in different times, in a single map. Remote sensing imagery is selected in key dates, when crops are vigorous, and Vegetation Index maps are generated on those dates. These layers are then normalized, and integrated in the management zone map.
 
  
=== Methodology - Cluster analysis ===
 
  
Se entiende por cluster a una unidad de superficie predeterminada, que sirve de base para un análisis estadístico. Se puede tomar como cluster, por ejemplo, el píxel de una imagen satelital, siendo para las Landsat 30 x30 mts, para las Aster 15 x 15 mts, para las Spot 10 x 10 mts.
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=== Methodology - Cluster analysis  ===
  
Una vez definida la superficie del Cluster, se generan mapas de NDVI normalizados (cuya grilla tenga el mismo tamaño que los píxeles de las imágenes satelitales). Las capas de NDVI son creadas a partir de imágenes seleccionadas de acuerdo a fechas claves, donde los cultivos reflejan vigorosidad.  
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A cluster is a predefined area, for statistical analysis purposes. For instance a cluster could be the pixel of a satellite image, such as 30x30 mts for Landsat images, 15 x 15 mts for Aster images, or 10 x 10 mts for Spot images. Once the Cluster area is defined, a normalized NDVI map is generated, with a grid with the cluster size.  
  
<br>Este es un procedimiento que realizamos exclusivamente a nivel de lote.
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the following sample images and corresponding NDVI illustrate the process:
  
<br>En el siguiente ejemplo se muestras las imágenes utilizadas:
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'''//insert images in the table'''
  
<br>Image:IMAGEN_1.jpg Imagen Landsat 25-01-2006  
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[[Image:IMAGEN 1.jpg|Image:IMAGEN_1.jpg]] Imagen Landsat 25-01-2006  
  
<br>Imagen Landsat 06-01-2005  
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[[Image:IMAGEN 2.jpg|279x200px]] Imagen Landsat 06-01-2005  
  
<br>Imagen Landsat 08-03-2004  
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[[Image:IMAGEN 3.jpg|300x200px]] Imagen Landsat 08-03-2004  
  
<br>
 
  
A partir de las imagenes anteriores se realizan sus correspondientes indices verdes
 
  
Image:NDVI_1.jpg NDVI Landsat 25-01-2006
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These images are integrated by analyzing each cluster, defining homogeneous production areas, and obtaining the management zones map.
  
<br>NDVI Landsat 06-01-2005
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'''//insert Image:'''Mapa_productividad3.jpg
  
<br>NDVI Landsat 08-03-2004
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<br>
 
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<br>Al tener listas todas las capas de NDVI necesarias, se analizan por cluster, lo que permite definir zonas homogéneas y obtener como resultado un mapa de productividad.
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Image:Mapa_productividad3.jpg
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<br>Category:Servicios <br>
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Revision as of 22:29, 24 August 2009

Overview

Management Zones maps are generated based on the combination of Vegetation Index maps, through a process called 'cluster analysis'. It's also possible to include information from previous yield monitor maps if available. 

This is a procedure relatively simple, automated and objective, that allows to compare the field production and variability in different times, in a single map. Remote sensing imagery is selected in key dates, when crops are vigorous, and Vegetation Index (NDVI) maps are generated on those dates. These layers are then normalized, and integrated in the management zone map.


Methodology - Cluster analysis

A cluster is a predefined area, for statistical analysis purposes. For instance a cluster could be the pixel of a satellite image, such as 30x30 mts for Landsat images, 15 x 15 mts for Aster images, or 10 x 10 mts for Spot images. Once the Cluster area is defined, a normalized NDVI map is generated, with a grid with the cluster size.

the following sample images and corresponding NDVI illustrate the process:

//insert images in the table

Image:IMAGEN_1.jpg Imagen Landsat 25-01-2006

279x200px Imagen Landsat 06-01-2005

300x200px Imagen Landsat 08-03-2004


These images are integrated by analyzing each cluster, defining homogeneous production areas, and obtaining the management zones map.

//insert Image:Mapa_productividad3.jpg