Bearing Distance To Line

Summary

Creates a new feature class containing geodetic line features constructed based on the values in an x-coordinate field, y-coordinate field, bearing field, and distance field of a table.

Illustration

Bearing and distance construction parameters

Usage

• If you use text files and .csv (comma-separated value) files as input, make sure that they follow the file structure specified in About tabular data sources.

• Each geodetic line is constructed using a particular set of field values representing the x and y coordinates of a starting point, distance from the starting point, and bearing angle measured from North. These fields and values will be included in the output.

• A geodetic line is a curve on the surface of the earth. However, a geodetic line feature is not stored as a parametric (true) curve in the output, but as a densified polyline representing the path of the geodetic line. If the length of a geodetic line is relatively short, it may be represented by a straight line in the output. As the length of the line increases, more vertices are used to represent the path.

• When the output is a feature class in a file geodatabase or a personal geodatabase, the values in the Shape_Length field are always in the units of the output coordinate system specified by the Spatial Reference parameter; and they are the planar lengths of the polylines. To measure a geodesic length or distance, use the ArcMap Measure tool; make sure to choose the Geodesic, Loxodrome, or Great Elliptic option accordingly before taking a measurement.

Syntax

BearingDistanceToLine_management (in_table, out_featureclass, x_field, y_field, distance_field, {distance_units}, bearing_field, {bearing_units}, {line_type}, {id_field}, {spatial_reference})

Parameter	Explanation	Data Type
in_table	The input table that can be a text file, CSV file, Excel file, dBASE table, or geodatabase table.	Table View
out_featureclass	The output feature class containing densified geodetic lines.	Feature Class
x_field	A numerical field in the input table containing the x coordinates (or longitudes) of the starting points of lines to be positioned in the output coordinate system specified by the spatial_reference parameter.	Field
y_field	A numerical field in the input table containing the y coordinates (or latitudes) of the starting points of lines to be positioned in the output coordinate system specified by the spatial_reference parameter.	Field
distance_field	A numerical field in the input table containing the distances from the starting points for creating the output lines.	Field
distance_units (Optional)	The units for the values in the distance_field. METERS KILOMETERS MILES NAUTICAL_MILES FEET US_SURVEY_FEET	String
bearing_field	A numerical field in the input table containing bearing angle values for the output line rotation. The angles are measured clockwise from North.	Field
bearing_units (Optional)	The units of the values in the bearing_field. DEGREES —Values in decimal degrees; this is the default. MILS —Values in mils. RADS —Values in radians. GRADS —Values in gradians.	String
line_type (Optional)	The type of geodetic line to construct. GEODESIC — A type of geodetic line which most accurately represents the shortest distance between any two points on the surface of the earth. The mathematical definition of the geodesic line is quite lengthy and complex and therefore omitted here. This line type is the default. GREAT_CIRCLE —A type of geodetic line which represents the path between any two points along the intersection of the surface of the earth and a plane that passes through the center of the earth. Depending on the output coordinate system specified by the Spatial Reference parameter, in a spheroid-based coordinate system, the line is a great elliptic; in a sphere-based coordinate system, the line is uniquely called a great circle—a circle of the largest radius on the spherical surface. RHUMB_LINE —A type of geodetic line, also known as a loxodrome line, which represents a path between any two points on the surface of a spheroid defined by a constant azimuth from a pole. A rhumb line is shown as a straight line in the Mercator projection. NORMAL_SECTION —A type of geodetic line which represents a path between any two points on the surface of a spheroid defined by the intersection of the spheroid surface and a plane that passes through the two points and is normal (perpendicular) to the spheroid surface at the starting point of the two points. Therefore, the normal section line from point A to point B is different from the one from point B to point A.	String
id_field (Optional)	A field in the input table; this field and the values are included in the output and can be used to join the output features with the records in the input table.	Field
spatial_reference (Optional)	The spatial reference of the output feature class. You can specify the spatial reference in several ways: By entering the path to a .prj file, such as C:/workspace/watershed.prj. By referencing a feature class or feature dataset whose spatial reference you want to apply, such as C:/workspace/myproject.gdb/landuse/grassland. By defining a spatial reference object prior to using this tool, such as sr = arcpy.SpatialReference("C:/data/Africa/Carthage.prj"), which you then use as the spatial reference parameter.	Spatial Reference

Code sample

BearingDistanceToLine example (stand-alone script)

Converts bearing and distance info into a line.

# Import system modules
import arcpy
from arcpy import env

# Local variables
input_table = r"c:\workspace\LOBtraffic.dbf"
output_fc = r"c:\workspace\SOPA.gdb\lob_traf001"

#BearingDistanceToLine
arcpy.BearingDistanceToLine_management(input_table, output_fc, "X", "Y", 
"NAUTICAL_MILES", "azim", "DEGREES", "GEODESIC","recnum")

Environments

• Current Workspace
• Scratch Workspace

Licensing information

• ArcGIS for Desktop Basic: Yes
• ArcGIS for Desktop Standard: Yes
• ArcGIS for Desktop Advanced: Yes