Land Cover Mapping Resource Mapping -- Remote Sensing and GIS for Conservation

Estimating Crop Production of Small Land-holder Farmers with Large-scale Multispectral Surveys

Spectral response of crop types Large field monocrop

Large single-crop fields can be flown and monitored with small-scale calibrated multispectral imagery ...

The shift in fractional reflectance between the red and infrared wavelengths is distinctive between different crops and can be used to identify large homogeneous fields in calibrated small-scale multispectral coverage or satellite imagery. However, much of the food in developing countries is grown on small plots that are less than ¼ hectare in size and configured with several different crops.

This type of widely distributed and undocumented crop production is easier to identify and assess with the multi-scale transect approach. A geographically distributed grid of large-scale coverage can be used to either identify different crop mixtures in a region and link them to smaller scale imagery, or directly estimate the production of those crops with the statistical point sampling approach developed and used by Dr. Norton-Griffiths (Norton-Griffiths, 1988).

... but small land-holder plots may be configured with several different crops, such as the mixture of cacao, bananas, and vegetables on the right below, or deliberately kept small and isolated like the coca field being harvested on the left below.

Small land holder crops