3D Analyst Tools ArcToolbox

Create Thiessen Polygons, Generate Near Table Tools

Create Thiessen Polygons

How to use Create Thiessen Polygons Tool in ArcToolbox ArcMap ArcGIS??

Create Thiessen Polygons Tool

Create Thiessen Polygons Tool, Proximity Toolset, Analysis Toolbox

Create Thiessen Polygons

Creates Thiessen polygons from point features.

Each Thiessen polygon contains only a single point input feature. Any location within a Thiessen polygon is closer to its associated point than to any other point input feature.

1.  Input Features

The point input features from which Thiessen polygons will be generated.

2.  Output Feature Class

The output feature class containing the Thiessen polygons that are generated from the point input features.

3.  Output Fields (optional)

Determines which fields from the input features will be transferred to the output feature class.

1. ONLY_FID—Only the FID field from the input features will be transferred to the output feature class. This is the default.
2. ALL—All fields from the input features will be transferred to the output feature class.

Generate Near Table

How to use Generate Near Table Tool in ArcToolbox ArcMap ArcGIS??

Generate Near Table Tool 

Generate Near Table Tool, Proximity Toolset, Analysis Toolbox

Generate Near Table

Calculates distances and other proximity information between features in one or more feature class or layer. Unlike the Near tool, which modifies the input, Generate Near Table writes results to a new stand-alone table and supports finding more than one near feature.

1.  Input Features

The input features that can be point, polyline, polygon, or multipoint type.

2.  Near Features

One or more layer of feature class containing near feature candidates. The near features can be of point, polyline, polygon, or multipoint. If multiple layers or feature classes is specified, a field named NEAR_FC is added to the input table and will store the paths of the source feature class containing the nearest feature found. The same feature class or layer may be used as both input and near features.

3.  Output Table

The output table containing the result of the analysis.

4.  Search Radius (optional)

The radius used to search for near features. If no value is specified, all near features will be candidates. If a distance is entered, but the unit is left blank or set to Unknown, the units of the coordinate system of the input features are used. If the Geodesic option is used in the Method parameter, a linear unit such as Kilometers or Miles should be used.

5.  Location (optional)

Specifies whether x- and y-coordinates of the input feature's location and nearest location of the near feature will be written to FROM_X, FROM_Y, NEAR_X, and NEAR_Y fields.

1. Unchecked—Locations will not be written to the output table. This is the default.
2. Checked—Locations will be written to the output table.

6.  Angle (optional)

Specifies whether the near angle will be calculated and written to a NEAR_ANGLE field in the output table. A near angle measures direction of the line connecting an input feature to its nearest feature at their closest locations. When the Planar method is used in the Method parameter, the angle is within the range of -180° to 180°, with 0° to the east, 90° to the north, 180° (or -180°) to the west, and -90° to the south. When the Geodesic method is used, the angle is within the range of -180° to 180°, with 0° to the north, 90° to the east, 180° (or -180°) to the south, and -90° to the west.

1. Unchecked—NEAR_ANGLE will not be added to the output table. This is the default.
2. Checked—NEAR_ANGLE will be added to the output table.

7.  Find only closest feature (optional)

Specifies whether to return only the closest features or multiple features.

1. Checked—Only the closest near feature will be written to the output table. This is the default.
2. Unchecked—Multiple near features will be written to the output table (a limit can be specified in the Maximum number of closest matches parameter).

8.  Maximum number of closest matches (optional)

Limit the number of near features reported for each input feature. This parameter is disabled if Find only closest feature is checked.

9.  Method (optional)

Determines whether to use a shortest path on a spheroid (geodesic) or a flat earth (planar). It is strongly suggested to use Geodesic method with data stored in a coordinate system which is not appropriate for distance measurements (for example, Web Mercator and any geographic coordinate system), or any dataset which spans a large geographic area.

1. PLANAR—Uses planar distances between the features. This is the default.
2. GEODESIC—Uses geodesic distances between features. This method takes into account the curvature of the spheroid and correctly deals with data near the dateline and poles.