With this knowledge and with triangle trigonometry, we can calculate the length of the hypotenuse of this upper right triangle with the formula abs(r/cos(theta/2)). We know the length of the radius because it's just the length of the outer radius of the wedge. We know the size of the angle formed by the line of bearing and the radius: it's simply (theta/2) because we deliberately chose this radius because it bisects theta. Now consider just the upper of the two right triangles in the graphic. Note that the angle between the radius and the tangent line is a right angle, meaning that the large clip triangle can be split into two smaller right triangles. Finally, draw lines from the origin point of the circle that extend along the lines of bearing of the wedge until they intersect the line that is tangent to the circle. Next, draw a line that is tangent to the circle at the point where the radius intersects the circle. Draw a radius of the circle such that it bisects the angle theta. First, call the angle between the first and second lines of bearing theta. To do so, we'll construct the clip triangle in such a way that it will have the properties we need.
Arcmap buffer full#
If the user provides an inner radius field, the user may still leave some entries in the inner radius field blank, in which case a full wedge will be created for that row.įor each input point, the tool reads the point's coordinates and attributes. If the user provides an inner radius field, then input rows that contain an entry in that field will be made into an arcband shape by creating the full wedge shape and then erasing from the center of the wedge outward by the distance specified in the inner radius field.
For example, "5 MILES", "3.41 kilometers", or "23 NauticalMiles". The entries in the radius field(s) must be in the format required by ESRI's ArcGIS Buffer tool. Optionally, the name of the field that contains the inner radius of each arcband.The name of the field that contains the outer radius of each wedge.The names of the fields that specify either the two lines of bearing or the bearing and swath that define the angular extent of the wedges.After opening either tool in ArcGIS, the user specifies the following: The different tools allow the user to specify either the two lines of bearing or the line of bearing and swath that will help define each wedge/arcband. The user chooses one of the two tools within the ArcGIS toolbox. The Wedge Maker for ArcGIS is an ArcGIS tool that allows the user to create wedge and arcband (a wedge with a part of the cone of the wedge erased) shapes.