Research Methodology - Historical Land Use/Land Cover Classification Using Remote Sensing - page 78

LANDSAT-TM - August -

LANDSAT-MSS-June-1975

2007

P173-r034
P172 -
r035/Master
scene

P186-r034

P171- r035

P185 -
r035/Master
scene

P184- r035

P173-r035

P186-r035

P171-r036

P184- r036 P172-r037

P185- r036

No atmospheric correction/no atmospheric parameters
Only relative radiometric normalization /iMAD

Atmospheric correction/ATCOR -2 +
Relative radiometric normalization /iMAD

Mosaic /Ma
ster scene

Mosaic iMAD

Fig. 5.9 Radiometric normalization between the two data-sets, which were used for change

detection

master scene has been selected in each data set to which all other scenes have been
adjusted. LANDSAT-MSS scene (p185r035) and LANDSAT-TM scene
(p172r035) were selected as master scenes for each data set, as each was in the
center of the study area and covered the greater part of it. Atmospheric conditions/
illumination were the same overall in each scene (e.g., no dust, no haze, etc.), and
they had no cloud cover. All other scenes in each data set were radio-metrically
adjusted based on the two master scenes. Regions in the image overlap areas of the
bordering scenes were used to calculate regression coefficients, which were
applied in a second phase to the complete sub-scene. The overlapping areas were
selected to represent the variability of surface across the scenes. Finally, after
mosaicking the images of each data set, the TM-Mosaic-Image was chosen as a
master scene to normalize the MSS-Mosaic-Image radio-metrically (Fig. 5.9 ).
Figure 5.10 provides the results of the radiometric normalization using iMAD.
MSS-1975-Mosaic/before (iMAD) MSS-1975-Mosaic/after (iMAD) TM-2007-
Mosaic/Master scene.

Basic Stats Stdev Stdev Stdev

Band 1 24.345611 53.79413 66.910881

Band 2 39.756239 38.173823 42.59285

Band 3 41.205301 63.594957 62.193548

Band 4 31.961721 60.645272 59.189952

Fig. 5.10 iMAD results for the two data sets MSS-1975 and TM-2007. We can notice that the
basic statistics (e.g., Stdev) of the radiometric normalized image are more similar to the master
scene than the unnormalized image