Integrating Landsat with MODIS Products for Vegetation Monitoring - Satellite-based Applications on Climate Change - page 250

Landsat and MODIS are consistent in the test. The accuracy of normalization
approach depends on the data qualities of Landsat surface reflectance and
MODIS data products. Well-distributed high-quality samples across the full range
of data product values can help to reduce the variability.
The MODIS data products are the appropriate data sources for use as a reference
for Landsat since (1) MODIS has similar bandwidth to medium resolution data
sources, (2) MODIS provides daily global coverage data, (3) MODIS products have
been validated in transparent validation exercises and provide comprehensive pixel
level quality control flags, and (4) MODIS products are freely available online and
easy to access. Other consistent coarse-resolution data sources can also be used as
reference. When MODIS data products are utilized as references, the results will be
limited to the MODIS era.
Different from other data fusion approaches such as the STARFM and the
STAARCH, the normalization approach only requires one target MODIS data
and thus simpler and faster. However, it assumes that land cover types do not
change and split to 1-to- n relation between medium spatial resolution sensor and
target MODIS acquisition date. Ideally, the medium spatial resolution data and
MODIS data should be acquired from the same season in similar phenology stage.
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