Research Article
Monitoring of Damage in Sunflower and Maize Parcels Using Radar and Optical Time Series Data
Table 15
Characterization of weed maps derived from radar and optical satellite data for sunflower parcels.
| | Basis of weed map | Type | #dates | Last date | Conditions for identification of weed infection | Overall (%) |
| | RS2, 17/6/2012 | Radar | 1 | 17/6/2012 | SE < −1 | 61.1 | | SPOT4, 28/7/2012 | Optical | 1 | 28/7/2012 | NDVI > 60 | 72.8 | | LISS, 5/8/2012 | Optical | 1 | 5/8/2012 | NDVI > 50 | 78.4 | | SPOT5, 20/8/2012 | Optical | 1 | 20/8/2012 | NDVI > 35 | 83.0 | | SPOT4, 28/7/2012 + LISS, 5/8/2012 | Optical | 2 | 5/8/2012 | NDVI1 > 60 and NDVI2 > 50 | 78.8 | | RS2_17/6/2012 + RS2_11/7/2012 | Radar | 2 | 11/7/2012 | SE1 < −1 and SE2 < −1 | 78.9 | | RS2_17/6/2012 + RS2_11/7/2012 + SPOT4, 28/7/2012 + LISS, 5/8/2012 | Radar + optical | 2-2 | 5/8/2012 | SE1 < −1 and SE2 < −1 and
NDVI1 > 60 and NDVI2 > 50 | 89.7 | | RS2_17/6/2012 + SPOT4_28/7/2012 | Radar + optical | 1-1 | 28/7/2012 | SE < −1 and NDVI > 60 | 83.9 | | RS2_17/6/2012 + LISS_5/8/2012 | Radar + optical | 1-1 | 5/8/2012 | SE < −1 and NDVI > 50 | 86.7 | | RS2_17/6/2012 + SPOT5_20/8/2012 | Radar + optical | 1-1 | 20/8/2012 | SE < −1 and NDVI > 35 | 91.3 |
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