A study of land cover classification accuracy for MOS-1 MESSR high and low gain data.
Yukio Mukai, yasunori Nakayama
Remote Sensing Technology center of Japan.
Korehiro Maeda
National Space Development Agency of Japan
Abstract
MOS-1 MESSR has a two-gain mode of high and low and is normally operated in low gain mode. This study examined the accuracies in land cover classification for both high and low gain mode data of MOS -1 MESSR An area within a side lap region between two paths is selected as a test site and two MESSR data which observed the test site only one day a part in high and normal gain were collected these two MESSR data covering the test site were registered using ground control points supervised maximum likelihood classifications were performed for both gain data selecting training areas at same cases using the confusion matrices of the training data. Percents correctly classified in the confusion matrix were higher for most of categories in high gain than in normal gain and the average values of the percents correctly classified for all categories were 97% in high gain and 95% in normal gain it van be seen from this study that the land cover classification accuracy is better in high gain than in normal gain..
Introduction
Japanese Marine observation satellite (MOS) was launched in Feb 1987 and it mounts three kinds of sensor MESSR (Multi spectral ) electronic self scanning radiometer VTIR visible and thermal infrared self scanning Radiometer 0m VRTIR scanning Radiometer ) MOS -1 is now successfully collecting the earth observation data and in Feb. 1990 MOS 1b mounting the same sensors as MOS-1 was launched which enabled to increase the chances to observe the earth by MOS stores.
MESSR has two gain modes of high and low and in normally in the low gain mode,. Therefore low gain is called normal gain. This study investigated the land cover classification accuracies of high and normal gain data.
The outlines of MESSR.
There are two systems in MOS-1 MESSR and they are mounted parallel to the direction of movement of the space craft as shown parallel to the direction of movement of the space craft as shown in fig 1 the system mounted in the east and west side is called each system 1 and system 2 the swath of each system is 100 km and their overlaps about 10 km the two systems are operated alternatively in normal operation mode but can be operated simultaneously in special mode MESSR data have four bands and the range of wave length and the spatial resolution of each band are shown in table 1
Fig. 1 Observation by System I and II of MESSR
Fig. 2 Input-Output characteristics of high and normal gain of MESSR
| Band |
Range of wavelength
(mm) |
Spatial
Resolution
(m) |
1
2
3
4 |
0.51~0.59
0.61~0.69
0.72~0.80
0.80~1.10 |
50
50
50
50 |
The input out put characteristics of high and normal gain of MESS Rare shown in fig 2 the A/D converter output is from 0 to63 DN (digital number) for the input level from o to 100% in normal gain mode and the conversion characteristics of bands 1,2 are non linear but bands 3,4 are linear in high gain mode the coefficients of A/D conversion increase three times in band 1,2 and twice in band 4 compared to the normal gain mode there is no high gain mode in band 3.
