International Archives of Photogrammetiy and Remote Sensing. Vol. XXXII Part 7C2, UNISPACE III. Vienna. 1999
74
I5PR5
UNISPACE III - ISPRS Workshop on
“.Resource Mapping from Space”
9:00 am -12:00 pm, 22 July 1999, VIC Room B
Vienna, Austria
ISPRS
elements (written in the image file header) every time the image
is loaded into the application. The georeference correction is
carried out in terms of the satellite orbital parameters and
orientation (roll and yaw).
'ScanEx Catalogue Manager' application (Windows
95/NT). After an image file is ready it is passed to the Catalogue
Manager application which:
reads the file header and creates a record containing a
set of basic image characteristics (the date, time,
satellite name, type of a sensor, spectral channels,
dimensions, geographical borders, brief text comment)
and a description of the image file location (hard disk
directory or CD volume label),
creates a copy of the image (sampled with an
appropriate step) in JPEG format for quick-look
purposes.
The records and image copies are organized as a data base
supported by the Catalogue Manager. A user can enter any
combination of requirements to images (time interval, satellite,
sensor type, geographical region, comment keywords) into the
application and get a list of image files which meet the
requirements. Afterwards, he can immediately get the file
annotation and the image reduced copy. If the user is interested in
the image details the application asks to insert a CD with the
specified volume label and calls ScanViewer.
The Catalogue Manager also provides support for remote users.
They can work with the catalogue in the same manner as local
users do. To keep their local copies up-to-date catalogue
manager can synchronize data bases through the Internet. On our
Home Page http://scanex.ss.msu.ru All who can be interested to
get the information from Resurs-Ol satellite can do the order
through Remote ScanEx Catalog: to select the images by date,
region, quality (looking through the quicklooks) and then to fill
in the query form.
“Image Transformer” application (Windows 95/NT).
Performs the geographical transformation into geographical
projections (Longitude/Latitude, Merkator, Lambert, Polar-
Stereographic. Gauss-Kruger, UTM on the basis of Krassovsky-
1942 and WGS84 ellipsoids) and precise georeference
correction of images and exporting images into GIS formats
(BIL Raster (*.bil) format, Maplnfo Raster (*.tab) format.
RasterX Raster (*.bgp) format, BMP).
The application Image Transformer give the possibility of the
wide range of users to transform the images, received from
Resurs-0 into geographic projections, to perform th e precise
georeference correction of images and to export images into GIS
format.
“ScanEx NeRIS” application for thematic raster
image processing (Windows 95/NT). The newest
software development of R&D Center ScanEx is the
application for thematic image interpretation ScanEx
NeRIS, based on neural networks.
Capabilities of the ScanEx NeRIS software:
assessment the number of classes (clusters), required
for thematic description and thematic map
development;
estimation of internal heterogeneity of thematic
objects;
distribution of object’s features in model feature space;
estimation of the probability of thematic object
presence in selected scene’s area (classify ing of
scene’s area in three categories: optimistic, realistic
and pessimistic);
hierarchic classification and estimation of interclass
(cluster) distance (user-friendly interface for distance
tree processing) for correction of legend and
geographic content of thematic map;
developing of thematic-oriented neural networks for
raster processing and thematic object identification;
merging (graphic overlay) of data from different
scenes;
image re-digization for resolution improvement and
better visualization;
vectorization of intraclass (intraclaster) processing
results;
software products are compatible with coordinate
system of basic map projections;
export of raster covers and vector layers in exchange
format of well-known GIS.
The advantages of neural-based algorithm over a classical raster
processing algorithm:
it is ready against feature space changes in scene
(scene’s area and scale changes);
it is tolerant to standardization requirements (sun
angle, atmospheric aberration);
it is easy to correct in case of task changes;
it is simple for further application as a standard for
object identification.
And the main ScanEx NeRIS application advantage is an
interpreter can assess the results at all phases of automatic image
processing. Thanks to a simple user-friendly interface the
software package can be operated by geographer, geologist,
ecologist-thematic map specialist, and not only by interpreter-
specialist in digital image analysis.
A technological chain of creating and pre-processing satellite
images with ScanEx ground stations
Besides ScanER, Research and Development Center ScanEx
produces also personal stations for conventional (for personal
systems) data formats and satellite series, and among others -
ScanEX station for NOAA HRPT.
Of course, parameters of these systems - a carrier frequency,
signal bandwidth, modulation type, data rate, antenna beam
