A Vegetation Greenness "Difference" Map
| Throughout the growing season, farmers and crop producers need to understand how their crops are progressing. This helps them make important decisions about when to irrigate the fields, when to apply fertilizer, and when they may need to apply pesticides. To show how crops compare to the previous week, special mathematical models are used to compare crop conditions (NDVI values) with conditions from the week earlier. This produces a map called Greenness Difference Map 1 that helps to monitor crop progress. In this example, crop conditions from mid-July 2000 are compared to crop conditions from early-July 2000. Areas in dark green illustrate crops that have grown the most during this period, while yellow areas show vegetation that is not as green as the previous period. In this map, corn and soybeans in area 2 showed the most progress while crops in areas 1 and 4 showed more moderate progress. |
Credit: Kansas Applied Remote Sensing/NASA
For more info: http://www.kars.ukans.edu/products/greenreport.htm