By using the minimum intensity it is often possible to help give the water bodies a blue colour. The resulting ILU image is useful for quickly assessing the suitability of an interferometric pair for discrimination between different land use types. In addition, this particular RGB combination has been chosen so that the land-use types are coloured in a manner which might be found in a photographic image. This can often be an important consideration when presenting SAR data to audiences who are not SAR experts. Red areas correspond to bare rock and stable agricultural fields.
Yellow areas correspond to urban centres.
The IBP image shows the interferometric phase projected on a colour wheel in those regions where the coherence is higher than 0.2 and the average intensity image on a grey-scale elsewhere. In general, one of the main advantages of using interferometric techniques for land classification tasks is that the coherence provides an extra valuable feature, which can help to separate regions of forest from agricultural land cover. These are classes which are difficult to separate using SAR intensity alone. Therefore, the Indonesia project provides a good example of a large scale project where the IQL system has provided valuable information. In figure 1 another example of deforestation is shown.