quicklook images include area, season, time and so forth. Fig-
ure 3 shows a home page of this site on WWW.
4) CRISP-ERS Catalogue Browse (http://www.crisp.nus.sg/
crisp.html)
Satellite images from SPOT and ERS over Indochina penin-
sula area are offered by Centre for Remote Imaging, Sensing
and Processing National University of Singapore. About
four hundred ERS scenes are catalogued and clickable image
map for browsing ERS data is available. Figure 4 shows
CRISP-ERS catalogue browse over Indochina area.
station. Although above some satellite data catalogue systems have
hecked advantages in search of required data , respectively, it seems
for the to be better to have a feature that plural thumbnail images
"sh and which match the retrieval condition can be displayed on the
window at the same time. Besides the linkage of the retrieval
Figure 3 Home page of the site for. search for Quicklook system to database management system might be required for
AIntTo- images more powerful and effective search of vast satellite data.
LANDSAT/TM, SPOT/PLA & MLA, and NOAA/AVHRR. We'll discuss features of our proposed satellite data retrieval
http:// Figure 2 shows one of the WWW pages at CCRS catalogue Sysent ine nei section.
system.
klooks 3) satellite images and news (http://www.tkl.iis.u-tokyo.ac.jp/ 2 PROPOSED SATELLITE DATA RETRIEVAL
e 1978 SatIAN/Welcome.html) SYSTEM
nap of Quicklook images from NOAA environmental satellites are
archived for over about decade. Retrieval conditions for the Sere FeAUIes Such. as an excellent sraphical user interfaee
http:// and good connectivity to the WWW service through Internet
re essential to the retrieval system for end-users. The excel-
Table 1 Premise amount of thumbnail and detailed images
from ASTER
Sensor type Original Imageg Thumbnail Images | Detailed Images
VNIR 4100 x 4200 x 136 x 140 x 273 x 280 x
(777scene/day) 4B 3C 3C
SWIR 2048 x 2100 x | 128x131x3C 256 x 262 x
(777scene/day) 6B x 28 3C x 28
TIR 708 x 700 x 141 x 140 x 3C 236 x233 x
(1554scene/day) 5B x28 AC x28
C: Channels S: Scenes
ency in operation of the retrieval can be achieved by adopt-
ng the present prevailed WWW browser technique. To
make appropriate and reduced thumbnail images out of vast
digital satellite data plays an important role in construction of
he better retrieval system. Let us estimate approximate data
size of thumbnail and detailed images which will be received
from ASTER(Advanced Spaceborne Thermal Emission and
Reflection Radiometer) which is supposed to be launched in
7 d + 1998. Table 1 shows the premise amount of thumbnail and
: UD | hd p | © . : detailed images from ASTER. The size of thumbnail and de-
1 at the ; HUE ailed images are estimated by considering the displayed size
ls SyS- | of those images on end-users's CRT display of the computer.
atellite Figure 4 CRISP-ERS catalogue browse over The size of 140x140[pixels*lines] for thumbnail images is
ed for Indochina area appropriate for checking the quality of original satellite data
151
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B1. Vienna 1996
