| Information
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| Online Access
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| Support
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| Participation
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| Related Links
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| Technologies
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GSAC Final Report:
First Generation GSAC Report On-Line
(2003-12-22)
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The final report for the development of GSAC is available. Work includes the development of the first generation of GSAC software funded by UNAVCO.
Download
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GSAC Wholesaler:
GSAC Wholesaler Kit 1.6 released -
(2003-09-02)
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Some of the upgrades/changes made in this version include:
- Support for Oracle 9i databases, with Spatial extension
for production GSAC Wholesaler schema use.
- Extensions to GSAC schema tables monument_catalog and data_holding.
- Increased GSAC conf file flexibility.
- Functional improvements to gsac-wadmin and the inclusion of
gsac-pubd and gsac-pubs wholesaler utilities.
Download
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SOPAC Online Map Interface....For GSAC Exploration :
Now available!(2003-04).
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SOPAC now has a version of it's Online Map Interface serving the entire
set of published GSAC monuments as context layers for the user to explore, print,
and query. GPS monument layers for this interface are created nightly
using metadata services available through SOPAC's GSAC Retailer Interface.
To launch this map interface visit Maps.
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GSAC Web Client :
Upgraded to Wizard Interface(2002-12).
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The GSAC Web Client
has been upgraded to a more advanced interface using a Wizard theme where
the user is walked through various stages of search criteria, output configuration
and user preferences. In this new format the user can jump from stage to stage
if they wish, or follow the Wizard's lead through a GSAC search. All major features
of the previous Web Client have been retained, while additional new features, such
as Printable Pages, Configuration Summary and Retailer Designation
have been added. To see what else has changed, or to try the Web Client for the first
time, click here.
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New basic Wholesaler Strategy developed -
(2002-10-02)
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In an effort to help relieve some of the burdon and complexity involved with
joining the GSAC as an active Wholesaler there now exist binary executables
one can use to participate in the GSAC with minimal effort. Combined with a valid
configuration file and a visible FTP tree these utilities (gsac-pubs, gsac-pubd
and gsac-wadmin) can be used almost immediately by both new and existing GSAC
Wholesalers! Absolutely no experience with any particular programming language is
assumed, you don't need a database, and you have a choice of supported operating systems and
hardware platforms to choose from (currently Linux and Solaris only).
For more information on this topic
click here.
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GSAC Wholesaler:
GSAC Wholesaler Kit 1.5 released! -
(2002-09-20)
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Underlying Perl library improvements to better support future exception-handling
and automated Retailer-Wholesaler feedback/awareness in the event of persistent
problems or irregularities with a Wholesaler.
Added support for new proximity querying feature in GSAC::Agent::Postgres.
Added first-level of support for new Retailer-Wholesaler interaction bypassing FTP and
traditional flat-files through use of HTTP GSAC Services (e.g a Retailer-like
service provided by a Wholesaler). Using the new gsac-sync-ng
utility a Retailer will be able to interact directly with a Wholesaler's GSAC database
via the Wholesaler's HTTP GSAC Service. This new means of communication
will eventually render the traditional FTP flat-file GSAC tree unnecessary
for those Wholesalers with a GSAC database. Currently this strategy is still under
development....as "delete" functionality has not yet been completed.
Download
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Command Line Client
updated to version 1.24 (2002-09-06) 
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Recent improvements to the Command Line Client include support for a proximity
constraint as part of a user's query restrictions, uncompress support for removing
.gz or .Z compression from compressed files (requires gzip utility), and an
option for allowing duplicate files to be downloaded with the same filename from
more than one archive.
Get the latest version from here
Being evaluated : Support for hatanaka compression removal from RINEX observation
files.
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GSAC Web Client :
Upgraded(2002-08).
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The GSAC Web Client
has received another major batch of upgrade work. A major redesign of the interface
and improved Javascript support have enhanced the Bounding Box and Timespan for Data
components of the Search Criteria section of GSAC.cgi. To see what else has changed, or to
try the Web Client for the first time, click here.
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Command Line Client
updated to version 1.21 (2002-08-15).
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Recent improvements to the Command Line Client include a seamless retailer failover
support such that requests from the client are automatically submitted to the next
available/preferred retailer in the event of query failure or temporary Retailer maintenance.
Also included is support for char_id argument usage...allowing users to include one
or more (site-based) four-character identifiers as part of their criteria.
Get the latest version from here
Coming soon : Support for a proximity constraint in query restrictions, which will
allow a user to specify a point (in latitude, longitude decimal degrees) anywhere on the face
of the earth, plus a radius in meters, to help them construct their query.
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SOPAC GSAC Database:
Software Upgraded(2002-08-15).
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SOPAC uses the PostgreSQL database for GSAC Retailing. The PostgreSQL database
was upgraded to version 7.2.1 which includes a Statistics Collector to help
with performance tuning. The upgrade also includes PostGIS 0.7.1 which
provides some additional GIS functionality.
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GSAC Development :
Several GSAC components upgraded (2002-07).
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In an effort to help spur interest in the GSAC, as well as make preparations for the upcoming
Boulder GSAC Workshop (July 23 & 24) GSAC development has focused on polishing several
different components of the GSAC software. From a user's standpoint, both the
Web Client and the Command Line Client have received
minor improvements in their interfaces and support for GSAC Retailer directives (# lines with
information about query results, server status, etc). From a wholesaler's perspective we hope
the much-needed improvements in the
GSAC Wholesaler Kit will simplify the installation
process and provide clearer instructions on how to incorporate use of the kit into regular
archiving activities.
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GSAC Web Client :
Upgraded and integrated into main web site (2002-05).
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In an ongoing development effort for the GSAC the Web Client
has received some much-needed attention and integration work. On the surface the changes
are minimal, however, there have been several improvements made to the underlying GSAC Service at
SOPAC, making both the Web Client and the Command Line Client easier to work with.
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IGS Ottawa Workshop:
GSAC Presentation by Michael Scharber -
(2002-04-09)
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During the Data Center session of the recent IGS Workshop in Ottawa, Canada
a basic overview of the GSAC, it's status, architecture and development plans were
outlined to an international constituency from the GPS community. A copy of the
presentation media is available here for your reference.
Formats available for download :
PDF
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GSAC Wholesaler:
GSAC Wholesaler Kit 1.3 Beta released! -
(2002-03-16)
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Easier and more flexible installation.
Centralized configuration. No more hand editing multiple files.
New file system layout.
Bug fixes
Download
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GSAC Command Line Client:
GSAC Command Line Client Released!
(2002-03-01)
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Clients for multiple platforms.
Command line queries of GSAC retailers.
Collection of data from GSAC wholesalers.
Clients currently available :
Perl Source
Linux (x86)
Solaris (sparc)
Windows (win32)
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