• XML sample (two sites)
• Large xml files for western North America sites, and global sites, are generated daily and are available from the SOPAC http archive. We recommend using the "save target as" option, since the files are quite large. Note: SOPAC-processed sites only.
• Generate XML for your site(s) and date of interest. This sample link returns an xml file containing metadata for sites pin1 and trak for 01/01/2003. Date (YYYYMMDD) is optional and the utility will return all historical site equipment informaton if it is not included. The key-value pair "model_terms=false", can be used to stop model terms for the site from being returned. The key-value pair "format=station_info" can be used to produce output in the GAMIT station.info format (default is xml).
  • optional key-value pairs:
    • site=wwww;
    • date=YYYYMMDD;
    • model_terms=true|false
    • format=xml|station_info

  • This utility can be used from the command line, using wget, to obtain xml for the site(s) and date required, e.g., to obtain an xml file and write it to "pin1.xml", for date 20030101:

    -> wget "http://sopac.ucsd.edu/cgi-bin/procInputMetadata.cgi?site=pin1&date=20030101" -O pin1.xml

  • To produce a station.info file for the same:

    -> wget "http://sopac.ucsd.edu/cgi-bin/procInputMetadata.cgi?site=pin1&date=20030101&format=station_info" -O station.info

• The procInput.xsd xml schema that the above xml files conform to
• station.info, the GAMIT processing software metadata setup file, is created daily from the above global site xml file. Note: SOPAC-processed sites only.
• The xslt stylesheet used to create station.info from the xml file
• Up-to-date IGS antenna and receiver code xsd schemas. These are also generated daily, and are used as part of the main xml schema above.
• Site offset xml file available. This contains all site offsets (jumps) identified in REASoN GPS site processing. Each offset contains model-estimated offset magnitudes and sigmas (north/east/up components) and the cause of the offset, when known.

• siteOffsets.xml file.
• siteOffsets.txt file. This is created via:
• an xslt stylesheet

Resources

java org.apache.xalan.xslt.Process -in (xml input file) -xsl http://sopac.ucsd.edu/ns/geodesy/reason/procInput/2005/03/stationInfo.xsl

(Note: a perl wrapper script is used in addition to the stylesheet, for gamit firmware translation only.)

Overview

The REASoN SCIGN project is developing xml schemas and files to coordinate metadata exchange between SOPAC and JPL's GPS processing groups. This is required for production of consistent GPS site positions at both agencies, leading to an improved official SCIGN combination time series.

xml files containing site equipment and position metadata are now available. These are generated from the SOPAC database and refined model, respectively, and can be used as input to various types of GPS processing software. For example, an xslt stylesheet was developed to create the GAMIT station.info file. These files are available in "Products" below.

Site position metadata include site motion model terms. Users can calculate site positions at any epoch by entering these terms into the refined model algorithm (available soon). While this resource is available online as the SECTOR utility, it may be possible in the near future to submit these terms to a web service, thereby providing epoch-specific coordinates directly to a user's command-line, or program.

Goals of this GPS processing xml development include: