EFFECTS OF RESAMPLING SCHEMES ON THE GROUND ALBEDO MAPPING
OF LANDSAT MSS DATA
Sueo Ueno
Kanazawa Institute of Technology,P.0.Kanazawa-
South, Nonoichimachi,Ishikawa 921,Japan
ABSTRACT
In 300 square kilometer test area located within Kanazawa re
gion in Hokuriku district of Japan, the study was performed
such that the original multispectral scanner system (MSS)
data and three sets of resampled data are independently cla
ssified with (or without) deblurring, and are displayed in
eleven land use classes, allowing for the mean values and
covariance. Some of these studies on the resampled, classi
fied, and deblurred (or blurred) data sets are as follows:
(1) For all land use classes in training areas the nearest
neighbor assignment offers the best preservation of original
mean grey levels (or shapes),mean surface albedos, and their
covariances in spectral band 4,5, and 6. (2) In training sam
ples of coastal zone waters and broad-leaved trees both of
the bilinear and cubic convolution resampled data showed no
ticeable anomaly as compared to the nearest neighbor resam
pled ones in band 4,5, and 6. (3)There seems to be no signi
ficant difference between the quadratic discriminant classi
fication results of the three resampling schemes.
PREPROCESSING
In general, preprocessing includes the operations of sensor
calibration, scene or radiometric calibration, and the cor
rection of geometric inaccuracies of the scanning process.
In what follows, for the sake of simplicity, the preproces
sing of MSS data is confined to the radiometric and geometric
corrections.
Preliminary Data Handling
The Landsat data in digital format handled by us is the th
ree Computer Compatible Tapes (CCT) with identification and
annotation records. The annotation record contains informa
tion regarding the condition of exposure such as the date
(11SEP75),SUN EL(48°),AZ(131°),C(N35-56/E137-22), and ID(22
32-00470). The annotated and corrected 185km square ground
scene on the CCT is a final product of MSS. A scene is made
up of 2340 parallel scan lines, each containing approximately
3264 data samples. Our study for the estimation of resampling
effects on Landsat imagery was made on 256X256 pixels three
bands images of a region containing Kanazawa city and its
outskirts.
Radiometric Correction
On making use of CCT in the linear mode, the scene radiance
R(mw/cm ,sr,ym) in each band can be evaluated from the cor
rected linear digital value x by means of the expression
