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<html>
<head>
<title>SNAP help</title>
<link rel="stylesheet" href="css/helpapp.css">
<style media="print">#menu { display: none }</style>
<script src="js/jquery.min.js" ></script>
<script src="js/jquery.min.js" ></script>
<script src="js/helpapp.js" ></script>
<script src="js/wordindex.js" defer></script>
<script src="js/helpapp.js" ></script>
</head>
</body>
<div class="container">
<div id="menu">
<div class="menu_header"><div id="show-contents-button" class="menu-button">Contents</div><div id="show-search-button" class="menu-button">Search</div></div><div class="menu_area"><div id="contents" class="contents">
<div class="contents-level level-1">
<div class="contents-item"><a href="snap.html">SNAP overview</a></div>
</div>
<div class="contents-level level-1">
<div class="contents-item"><a href="programs/index.html">SNAP programs</a></div>
<div class="contents-level level-2">
<div class="contents-item"><a href="programs/snap_manager/index.html">snap_manager - environment for running adjustments</a></div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snap_manager/script.html">snap_manager scripting</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snap_manager/script_ui.html">snap_manager scripting user interface components</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snap_manager/script_functions.html">snap_manager scripting system functions and variables</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snap_manager/resyntax.html">Regular expression syntax</a></div>
</div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="programs/snap/index.html">SNAP - network adjustment program</a></div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snap/snap_proc_basic.html">Basic adjustment procedure</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snap/topic_input_files.html">Creating input files</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snap/topic_adjustment_outputs.html">Reviewing adjustment results</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snap/snap_common_problems.html">Common problems in SNAP adjustments</a></div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snap/snap_prob_converge.html">The adjustment does not converge</a></div>
</div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snap/snap_prob_format.html">Format errors in the input files</a></div>
</div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snap/snap_prob_singularity.html">The adjustment fails with a singularity</a></div>
</div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snap/snap_prob_memory.html">There is not enough memory for the program.</a></div>
</div>
</div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="programs/snapplot/index.html">Snapplot - graphical view of adjustments</a></div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snapplot/starting.html">Starting snapplot</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snapplot/configuration.html">Snapplot configuration</a></div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snapplot/configcmd.html">Snapplot configuration commands</a></div>
</div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snapplot/sp_commandfile.html">Snapplot commands in the command file</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snapplot/map_window.html">The map window</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snapplot/key_window.html">The key</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snapplot/station_window.html">The stations list</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snapplot/obs_window.html">The observations list</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snapplot/details_window.html">The details window</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item">Dialog boxes</div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snapplot/dlg_highlight_stations.html">The highlight stations dialog</a></div>
</div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snapplot/dlg_hideshow_stations.html">The hide stations dialog</a></div>
</div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snapplot/dlg_find_station.html">The find station dialog</a></div>
</div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snapplot/dlg_obs_display_options.html">The observation display options dialog</a></div>
</div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snapplot/dlg_highlight_observations.html">The highlight observations dialog</a></div>
</div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snapplot/dlg_obs_listing_options.html">The observation listing options dialog</a></div>
</div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snapplot/dlg_error_options.html">The error options dialog</a></div>
</div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snapplot/dlg_stdres_pens.html">The standardised residuals colours dialog</a></div>
</div>
<div class="contents-level level-4">
<div class="contents-item"><a href="programs/snapplot/dlg_redundancy_pens.html">The redundancy colours dialog</a></div>
</div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snapplot/background.html">Background graphics</a></div>
</div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="programs/dat2site/index.html">Dat2site - calculate trial coordinates</a></div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/dat2site/example.html">Example of dat2site</a></div>
</div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="programs/snapconv/index.html">Snapconv - changing coordinate systems</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="programs/snapgeoid/index.html">Snapgeoid - Calculate geoid heights</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="programs/site2gps/index.html">site2gps - calculate dummy GPS data files</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="programs/snapmerge/index.html">Snapmerge - merging coordinate files</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="programs/snapspec/index.html">Snapspec - calculate coordinate orders</a></div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snapspec/algorithm.html">Snapspec order calculation algorithm</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/snapspec/configuration.html">Snapspec configuration file</a></div>
</div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="programs/snaplist/index.html">snaplist - list adjustment results</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="programs/concord/index.html">concord - coordinate conversion program</a></div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/concord/error.html">Concord error messages</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="programs/concord/example.html">Examples of concord</a></div>
</div>
</div>
</div>
<div class="contents-level level-1">
<div class="contents-item"><a href="files/cmdcfg/index.html">Command files</a></div>
<div class="contents-level level-2">
<div class="contents-item"><a href="files/cmdcfg/cfg_file.html">Configuration files</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="files/cmdcfg/csv_format_definition.html">CSV format definition files</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="files/cmdcfg/cmd_syntax.html">Command file syntax</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="files/cmdcfg/cmd_adjustment_mode.html">Adjustment mode</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="files/cmdcfg/cmd_station_options.html">Using stations in adjustments</a></div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_stn_list.html">Station lists</a></div>
</div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="files/cmdcfg/cmd_additional_parameters.html">Additional adjustment parameters</a></div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_additional_parameter_commands.html">Additional parameter commands</a></div>
</div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="files/cmdcfg/cmd_def_res_format.html">Defining the residual listing format</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="files/cmdcfg/cmd_function_summary.html">Summary of commands by function</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="files/cmdcfg/cmd_alphabetic_summary.html">Alphabetical list of commands</a></div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_reject.html">accept</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_add_residual_column.html">add_residual_column</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_additional_parameter_commands.html">bearing_orientation_error</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_classification.html">classification</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_configuration.html">configuration</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_convergence_tolerance.html">convergence_tolerance</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_coordinate_file.html">coordinate_file</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_coordinate_precision.html">coordinate_precision</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_data_file.html">data_file</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_default_refraction_coefficient.html">default_refraction_coefficient</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_define_residual_format.html">define_residual_format</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_deformation.html">deformation</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_error_type.html">error_type</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_file_location_frequency.html">file_location_frequency</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_fix.html">fix</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_flag_significance.html">flag_significance</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_float.html">float</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_free.html">free</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_geoid.html">geoid</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_gps_antenna_height.html">gps_antenna_height</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_gps_vertical.html">gps_vertical</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_horizontal_float_error.html">horizontal_float_error</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_reject.html">ignore</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_ignore_missing_stations.html">ignore_missing_stations</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_include.html">include</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_list.html">list</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_magic_number.html">magic_number</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_max_adjustment.html">max_adjustment</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_max_iterations.html">max_iterations</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_mde_power.html">mde_power</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_min_iterations.html">min_iterations</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_mode.html">mode</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_number_of_worst_residuals.html">number_of_worst_residuals</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_output.html">output</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_output_csv.html">output_csv</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_output_precision.html">output_precision</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_plot.html">plot</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_list.html">print</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_proj_bearing_use_datum.html">proj_bearing_use_datum</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_recode.html">recode</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_redundancy_flag_level.html">redundancy_flag_level</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_reference_frame.html">reference_frame</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_additional_parameter_commands.html">reference_frame_scale_error</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_additional_parameter_commands.html">refraction_coefficient</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_reject.html">reject</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_reorder_stations.html">reorder_stations</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_set_observation_option.html">set_observation_option</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_sort_observations.html">sort_observations</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_spec_test_options.html">spec_test_options</a></div>
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<div class="contents-item"><a href="files/cmdcfg/cmd_specification.html">specification</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_station_code_width.html">station_code_width</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_station_offset_file.html">station_offset_file</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_summarize_errors_by.html">summarize_errors_by</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_additional_parameter_commands.html">systematic_error</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_test_specification.html">test_specification</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_title.html">title</a></div>
</div>
<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_topocentre.html">topocentre</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_use_distance_ratios.html">use_distance_ratios</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/cmdcfg/cmd_vertical_float_error.html">vertical_float_error</a></div>
</div>
</div>
</div>
<div class="contents-level level-1">
<div class="contents-item"><a href="files/crd/index.html">Station coordinate file</a></div>
<div class="contents-level level-2">
<div class="contents-item"><a href="files/crd/stn_code.html">Station codes</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="files/crd/stn_file_format.html">SNAP Station coordinate file format</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="files/crd/csv_stn_files.html">CSV format station coordinate files</a></div>
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<div class="contents-level level-2">
<div class="contents-item"><a href="files/crd/stn_crd_file_example.html">Examples of station coordinate files</a></div>
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<div class="contents-level level-2">
<div class="contents-item"><a href="files/crd/stn_offset_file_format.html">Station offset file format</a></div>
</div>
<div class="contents-level level-2">
<div class="contents-item"><a href="files/crd/stn_recode_file.html">Station recode file</a></div>
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</div>
<div class="contents-level level-1">
<div class="contents-item"><a href="files/data/index.html">Observation files</a></div>
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<div class="contents-item"><a href="files/data/obs_data_types.html">Data types</a></div>
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<div class="contents-item"><a href="files/data/obs_azimuth_data.html">Azimuth observations (AZ)</a></div>
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<div class="contents-item"><a href="files/data/obs_distance_ratios.html">Distance ratio observations (DR)</a></div>
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<div class="contents-item"><a href="files/data/obs_distance_data.html">Distance observations (SD, HD, ED)</a></div>
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<div class="contents-item"><a href="files/data/obs_gps_data.html">GPS observations (GB or GPS)</a></div>
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<div class="contents-item"><a href="files/data/obs_gx_data.html">Point coordinate observations (GX)</a></div>
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<div class="contents-item"><a href="files/data/obs_height_differences.html">Height difference observations (LV)</a></div>
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<div class="contents-item"><a href="files/data/obs_height_data.html">Orthometric and ellipsoidal height observations (OH, EH)</a></div>
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<div class="contents-item"><a href="files/data/obs_horizontal_angles.html">Horizontal angle observations (HA)</a></div>
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<div class="contents-item"><a href="files/data/obs_latlon_data.html">Latitude and longitude observations (LT, LN)</a></div>
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<div class="contents-item"><a href="files/data/obs_projection_bearings.html">Projection bearing observations (PB)</a></div>
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<div class="contents-item"><a href="files/data/obs_ref_coeff.html">Refraction coefficients</a></div>
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<div class="contents-item"><a href="files/data/obs_zenith_distances.html">Zenith distance observations (ZD)</a></div>
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<div class="contents-level level-2">
<div class="contents-item"><a href="files/data/obs_rejecting_data.html">Rejecting observations</a></div>
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<div class="contents-item">Observation attributes</div>
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<div class="contents-item"><a href="files/data/obs_classifications.html">Observation classifications</a></div>
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<div class="contents-item"><a href="files/data/obs_example_classification.html">Example of data classification</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/data/obs_bearing_error.html">Bearing orientation errors</a></div>
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<div class="contents-item"><a href="files/data/obs_dist_scale_errors.html">Distance scale errors</a></div>
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<div class="contents-item"><a href="files/data/obs_gps_ref_frames.html">GPS reference frames</a></div>
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<div class="contents-item"><a href="files/data/obs_refframe_scale_error.html">Reference frame scale error</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/data/obs_user_errors.html">User defined systematic errors</a></div>
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<div class="contents-level level-2">
<div class="contents-item"><a href="files/data/obs_file_format.html">SNAP observation file format</a></div>
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<div class="contents-item"><a href="files/data/obs_format_line.html">Line observation format</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/data/obs_format_grouped.html">Grouped observation format</a></div>
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<div class="contents-item"><a href="files/data/obs_format_covar.html">Grouped observations with covariance format</a></div>
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<div class="contents-item"><a href="files/data/obs_format_point.html">Point observation format</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/data/obs_gps_err_format.html">GPS error formats</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/data/obs_gx_err_format.html">Point coordinate error formats</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_hazdaz_error.html">Angle observation errors</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_ltln_error.html">Latitude and longitude observation errors</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_oheh_error.html">Orthometric and ellipsoidal height errors</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_by_func.html">Data definition commands by function</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_alphabetically.html">Data definition commands alphabetically</a></div>
<div class="contents-level level-4">
<div class="contents-item"><a href="files/data/obs_ddc_bearing_orientation_error.html">The #bearing_orientation_error command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_classification.html">The #classification command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_classify.html">The #classify command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_data.html">The #data command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_date.html">The #date command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_distance_scale_error.html">The #distance_scale_error command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_ds_error.html">The #ds_error command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_gps_enu_error.html">The #gps_enu_error command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_gps_error_type.html">The #gps_error_type command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_gx_enu_error.html">The #gx_enu_error command</a></div>
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<div class="contents-level level-4">
<div class="contents-item"><a href="files/data/obs_ddc_angles.html">The #hp_angles, #deg_angles, and #dms_angles commands</a></div>
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<div class="contents-level level-4">
<div class="contents-item"><a href="files/data/obs_ddc_lv_error.html">The #lv_error command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_note.html">The #note command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_projection.html">The #projection command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_ref_coeff.html">The #refraction_coefficient command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_reference_frame.html">The #reference_frame command</a></div>
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<div class="contents-item"><a href="files/data/obs_ddc_time.html">The #time command</a></div>
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<div class="contents-level level-3">
<div class="contents-item"><a href="files/data/obs_data_file_errors.html">Troubleshooting data file errors</a></div>
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<div class="contents-item"><a href="files/data/obs_example_file.html">Example data file</a></div>
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<div class="contents-item"><a href="files/data/csv_obs_files.html">CSV observation file format</a></div>
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<div class="contents-item"><a href="files/data/sinex_obs_files.html">SINEX observation files</a></div>
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<div class="contents-item"><a href="coordsys/index.html">Coordinate systems in SNAP</a></div>
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<div class="contents-item"><a href="coordsys/whatiscoordsys.html">What is a coordinate system</a></div>
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<div class="contents-item"><a href="coordsys/crdsys_file_format.html">Coordinate system file format</a></div>
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<div class="contents-item"><a href="coordsys/crdsys_ellipsoid_def.html">Ellipsoid definition format</a></div>
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<div class="contents-item"><a href="coordsys/crdsys_refframe_def.html">Reference frame definition format</a></div>
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<div class="contents-item"><a href="coordsys/crdsys_crdsys_def.html">Coordinate system definition format</a></div>
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<div class="contents-item"><a href="coordsys/crdsys_em.html">Equatorial Mercator projection definition format</a></div>
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<div class="contents-item"><a href="coordsys/crdsys_gn.html">Gnomic projection definition format</a></div>
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<div class="contents-item"><a href="coordsys/crdsys_lcc.html">Lambert Conformal Conic projection definition</a></div>
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<div class="contents-item"><a href="coordsys/crdsys_nzmg.html">New Zealand Map Grid definition format</a></div>
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<div class="contents-item"><a href="coordsys/crdsys_ps.html">Polar Stereographic projection definition format</a></div>
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<div class="contents-item"><a href="coordsys/crdsys_tm.html">Transverse Mercator projection definition format</a></div>
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<div class="contents-item"><a href="coordsys/crdsys_file_notes.html">Coordinate system notes format</a></div>
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</div>
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<div class="contents-item"><a href="coordsys/crdsys_standard_list.html">Standard coordinate systems provided with concord</a></div>
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<div class="contents-item"><a href="coordsys/geoid.html">Geoid grid files</a></div>
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<div class="contents-item"><a href="coordsys/gridfile_s.html">Grid file format</a></div>
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<div class="contents-item"><a href="coordsys/linzdefmodel.html">LINZ deformation model</a></div>
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<div class="contents-item"><a href="coordsys/linzdeffile.html">LINZ deformation file format</a></div>
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<div class="contents-item"><a href="coordsys/trigfile.html">Triangulated data file format</a></div>
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<div class="contents-item"><a href="adjustment/index.html">Adjustment strategies</a></div>
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<div class="contents-item"><a href="adjustment/topic_strategy_gross_errors.html">Minimum constraints adjustment to find gross errors</a></div>
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<div class="contents-item"><a href="adjustment/topic_strategy_obs_errors.html">Improving estimates of observation errors</a></div>
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<div class="contents-item"><a href="adjustment/topic_fitting_control.html">Fitting existing control</a></div>
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<div class="contents-item"><a href="adjustment/topic_strategy_gps_surveys.html">Adjusting GPS surveys</a></div>
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<div class="contents-item"><a href="adjustment/topic_strategy_eccentric_stations.html">Handling eccentric stations</a></div>
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<div class="contents-item"><a href="programs/snap/snap_proc_preanalysis.html">Network preanalysis</a></div>
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<div class="contents-item"><a href="programs/snap/snap_proc_vertical.html">Vertical adjustments</a></div>
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<div class="contents-item"><a href="programs/snap/snap_proc_accspec.html">Testing accuracy specifications</a></div>
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<div class="contents-item"><a href="files/index.html">Files used by SNAP</a></div>
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<div class="contents-item"><a href="general/changelog.html">Change log</a></div>
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