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Relative time NDVI mosaics are proposed as a tool for crop growth monitoring and yield forecasting.The mosaics are constructed for the region of interest for a given phenological phase of crop development (for example, flowering). Mosaics for different years, craeted for the same characteristic time of crop development, are used for crop growth monitoring and yield forecasting.
The approach is illustrated through two case studies:

• forecasting of wheat yield in the countries of Northern Africa (relative time NDVI mosaics are constructed for the flowering stage of crop development).
• assessing winter crop status in southern areas of Russia after the winter season (mosaics are constructed two dekads before the establishment of snow cover and two dekads after its disapperance).

NDVI values, calculated from SPOT4-Vegetation data, were used in both cases. Dates of crop phenological phases were determined applying the WOFOST crop growth model and ECMWF-derived meteorological grid data. Results demonstrate the validity of the approach and the improvement obtained as compared with traditional methods.

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