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2. XML input data format for gama-local

The input data format for a local geodetic network adjustment (program gama-local) is defined in accordance with the definition of Extended Markup Language (XML) for description of structured data. The XML definition can be found at

http://www.w3.org/TR/REC-xml

Input data (points, observations and other related information) are described using XML start-end pair tags <xxx> and </xxx> and empty-element tags <xxx/>.

The syntax of XML gama-local input format is described in XML schema (XSD), the file gama-local.xsd is a part of the GNU gama distribution and can formally be validated independently on the program gama-local, namely in unit testing we use xmllint validating parser, if it is installed.

For parsing the XML input data, gama-local uses the XML parser Expat copyrighted by James Clark which is described at

http://www.jclark.com/xml/expat.html

Expat is subject to the Mozilla Public License (MPL), or may alternatively be used under the GNU General Public License (GPL) instead.

In the gama-local XML input, distances are given in meters, angular values in centigrades and their standard deviations (rms errors) in millimeters or centigrade seconds, respectively. Alternatively angular values in gama-local XML input can be given in degrees and seconds (see section Angular units). At the end of this chapter an example of the gama-local XML input data object is given.

2.1 Angular units  
2.2 Prologue   XML declaration
2.3 Tags <gama-local> and <network>  
2.4 Network description   Tag <description>
2.5 Network parameters   Tag <parameters />
2.6 Points and observations   Tag <points-observations>
2.7 Points   Tag <point />
2.8 Set of observations   Tag <obs>
2.9 Directions   Tag <direction />
2.10 Horizontal distances   Tag <distance />
2.11 Angles   Tag <angle />
2.12 Slope distances   Tag <s-distance />
2.13 Zenith angles   Tag <z-angle />
2.14 Azimuths   Tag <azimuth />
2.15 Height differences   Tag <height-differences>
2.16 Control coordinates   Tag <coordinates>
2.17 Coordinate differences (vectors)   Tag <vectors>
2.18 Attribute extern  
2.19 Example of local geodetic network   A complete example of a network
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