Levels
of Processing
Three levels of processing are available to the public
for Landsat 7 ETM+ data: Level 0R (raw uncorrected),
Level 1R (radiometrically corrected), and Level 1G
(radiometrically and geometrically corrected). This
page provides a detailed explanation and illustration
of each level of correction.
LPGS vs.
NLAPS Comparison
Two separate processing systems are used to generate
USGS Landsat 7 Level 1 products. While the products
generated by these two systems are very similar, there
are several differences. This page provides a comparison
of the two processing systems and their products.
MTFC Parameters
The new Modulation Transfer Function Compensation
(MTFC) parameters for the Landsat 7 Calibration Parameter
File (CPF) were submitted for inclusion in the 4Q2001
CPF release. The new coefficients used in the CPF
are derived from on-orbit estimates of the ETM+ along-
and across-scan MTF and replace the previous coefficients,
which were based on prelaunch MTF measurements in
the along-scan direction only.