I have a NDVI map from MODIS data for my AOI. When classified, i noticed that few of the pixels appear in " white" color and show no value. How do i classify these pixels and attache an appropriate / logical value to these pixels?
You can use the Spatial Analyst
Con tool to convert NoData to another value. For example, here is a raster calculator expression:
Esri has a technical article on the subject: