| Rice Mapping
A set of four ERS images of the Demak area of Java were
collected in 1994; the first and third of these are shown on the
next 2 pages.
The changes between images can be used to identify the presence
of rice, and to distinguish between early and late crops. This is
typically carried out using a fixed (eg 3*3) filter as classifier;
but substantially better sensitivity is achieved by using an
adaptive filter (segmentation) prior to classification of the
segmented image. We carry
out a joint unsupervised segmentation of all four images,
providing a common set of field boundaries, and then classify the
segmented images with the results shown below. The accuracy and
sensitivity achieved is superior to that obtained by alternative
approaches.
|
