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What is the News?
Here we
present the differences, improvements and new tools that were
implemented in the 5.2 SPRING Version.
In
order to improve the geometric correction of the images used in the SPRING
5.2, it
was added a tool for image orthorectification. The
orthorectification,
also called 3D geometric correction, aims to reduce distortions,
introduced by the attitude of the sensor during the image acquisition,
as well as errors due to relief displacement. The
orthorectification tool available in
the SPRING
5.2 is
based on the Model of Rational Functions and uses information contained
in RPC (Rational Polynomial Coefficients) files and a Digital Elevation
Model, to remove systematic errors caused by the platform, terrain and
sensor. The
orthorectification procedure allows to obtain an image in orthogonal
perspective that has better accuracy and provides better results when
it is used as a data source to derive cartographic documents. It
was developed, for SPRING
5.2 a vectorization tool that enables a
semi-automatic, or automatic, extraction of a vector data from an input
image. This
tool can assist the user in the process of vector editing, optimizing
working time. The user can, for example, automatically obtain the
vector information from a raster topographic map from the Brazilian
Institute of Geography and Statistics (IBGE). Two
options are available for vectorization: automatic and
semi-automatic. In automatic mode the vectorization process occurs
without user intervention. In the semi-automatic, available only inside
the Vector Edit tool, you can perform a partial image vectorization. With
SPRING
version5.2 internet online maps
can be displayed in its main visualization window. For
this, it was deployed two modules in the system that allows to access,
or to provide, remote data available from WMS (OpenGIS Web Map
Service) and WFS (Open Geospatial
Consortium Web Feature Service Interface Standard),making the
SPRING 5.2
client toWMS
and
WFS servers. The
SCARTA,module was
restructured for this SPRING
new
version. Now the user can access charts, or its frames, directly from
the system interface in order to display or to edit them. The
new SCARTA allows access to its
all functions in a practical way. It allows also using the various
tools built into
SPRING in
its updating processes as, for example, the new control panel and
automatic display of information layers. The
plug-in echnology allows
external software developers to create new tools for a software system
providing to it new specific functionalities. In
the SPRING
5.2 was
developed a function that allows the user to add plugins. Therefore the user
now will be able to add new functionalities to the SPRING according to
his needs. Any user also will be able to turn available in the system
new functionalities that he seems it is important to share with other
SPRING users. As
an example for this new version, we have a plug-in hat makes it
possible to access or provide remote data available from WMS and WFS
services. The
database manager SQLITE was incorporated
into SPRING with the aim of
replacing the database manager Dbase, because it had such
limited support for 64 bit and it is not freeware. The
SQLITE operation is similar
to the Dbase. Among its main features are: Thinning
- Implementation of thinning tool for raster data. Raster
maps resulting from a scanner process, over a map sheet, frequently
present lines with widths larger than one pixel. This, of course,
depends on the resolution of the scanner being used. In automatic
vectorization process from raster data, this thick, (“fat”), lines are
transformed in misleading polygons. This leads to a further forced
vector edition task to have better line representations. To avoid this
type of errors, the thinning process thin the thick lines trying to
maintain their widths equal 1 pixel. The thinning process can be used
as a preprocessing to create more reliable vector representations of
scanned raster maps. Assistant
Database -
Wizard for database creation add in the plug-in technology. This
tool was developed to assist the user in creating a database on SPRING
5.2, making this task easier and more intuitive. Restoration
of CBERS 2B The
image restoration is a radiometric correction technique used to correct
distortions inserted by the optical sensor during the process of
digital images acquisition. In order to keep the SPRING 5.2 updated,
the Restore tool was modified to process images of the available
sensors on the satellite CBERS 2B. A
tool for resampling image was added in order to generate, in a simple
way, an output image with a different pixel size value, defined by the
user, of the input image. Line
Simplification A
line simplification tool was added to the models of SPRING vector 5.2.
The process of line simplification, previously available only through
mosaic tool, is now available in the menu of vector data models. |
