Create Spatial Reference, Define Projection and Project Tools
Create Spatial Reference
How to Create Spatial
Reference Tool in Arc Toolbox ArcMap ArcGIS??
Create Spatial Reference
Path to access the tool
:
Create
Spatial Reference Tool, Projections
and Transformations Toolset, Data
Management Tools Toolbox
Create
Spatial Reference
Creates a spatial
reference for use in ModelBuilder.
1. Spatial Reference (optional)
The name of the spatial
reference to be created.
2. Spatial Reference Template (optional)
The feature class or
layer to be used as a template to set the value for the spatial reference.
3. XY Domain (optional)
The allowable coordinate
range for x,y coordinates.
4. Z Domain (min max) (optional)
The allowable coordinate
range for z-values.
5. M Domain (min max) (optional)
The allowable coordinate
range for m-values.
6. Template XYDomains (optional)
The feature classes or
layers that can be used to define the XY Domain.
7. Grow XYDomain By Percentage (optional)
The percentage by which
the XY Domain will be expanded.
Define Projection
How to Define Projection Tool
in Arc Toolbox ArcMap ArcGIS??
Define Projection
Path to access the tool
:
Define
Projection Tool, Projections and Transformations Toolset, Data Management Tools Toolbox
Define
Projection
Overwrites the
coordinate system information (map projection and datum) stored with a dataset.
This tool is intended for datasets that have an unknown or incorrect coordinate
system defined.
All geographic datasets
have a coordinate system that is used throughout ArcGIS to display, measure,
and transform geographic data.
If the coordinate system for a dataset is
unknown or incorrect, you can use this tool to specify the correct coordinate
system. You must know the correct coordinate system of the dataset before using
this tool.
1. Input Dataset or Feature Class
Dataset or feature class
whose projection is to be defined.
2. Coordinate System
The coordinate system to
be applied to the input. The default value is set based on the Output
Coordinate System environment setting.
Project
How to Project Tool in Arc
Toolbox ArcMap ArcGIS??
Project Tool
Path to access the tool
:
Project
Tool, Projections and Transformations Toolset, Data Management Tools Toolbox
Project
Projects spatial data
from one coordinate system to another.
1. Input Dataset or Feature Class
The feature class,
feature layer, or feature dataset to be projected.
2. Input Coordinate System (optional)
The coordinate system of
the input feature class or dataset. This parameter becomes active when the
input has an unknown, or unspecified, coordinate system. This allows you to
specify the data's coordinate system without having to modify the input data
(which may not be possible if the input is in read-only format).
3. Output Dataset or Feature Class
The output dataset to
which the results will be written.
4. Output Coordinate System
The coordinate system to
which the input data will be projected.
5. Vertical (optional)
The option is only
active when the input and output coordinate systems have a vertical coordinate system,
and the input feature class coordinates have z-values. Also,
many vertical
transformations require additional data files that must be installed on the
computer using the ArcGIS Coordinate Systems Data installation package.
When Vertical is
checked, the Geographic Transformation parameter can include ellipsoidal
transformations and transformations between vertical datums. For example,
“~NAD_1983_To_NAVD88_CONUS_GEOID12B_Height + NAD_1983_To_WGS_1984_1” transforms
geometry vertices that are defined on NAD 1983 datum with NAVD 1988 heights
into vertices on the WGS 1984 ellipsoid (with z-values representing ellipsoidal
heights). The tilde (~) indicates the reversed direction of transformation.
This option is not compatible with the Preserve Shape parameter.
- Unchecked—Z-values of geometry coordinates will be ignored. The z-values will not be modified. This is the default.
- Checked—The transformation specified in the Geographic Transformation parameter is applied. The Project tool transforms x-, y-, and z-values of geometry coordinates.
6. Geographic Transformation (optional)
This method can be used
for converting data between two geographic coordinate systems or datums. This
optional parameter may be required if the input and output coordinate systems
have different datum.
The tool automatically
selects a default transformation. You can choose a different transformation
from the drop-down list. Transformations are bidirectional. For example, if
you're converting data from WGS 1984 to NAD 1927, you can choose a
transformation called NAD_1927_to_WGS_1984_3, and the tool will apply it
correctly.
The parameter provides a
drop-down list of valid transformation methods. See the usage tips for further
information on how to choose one or more appropriate transformations.
7. Preserve Shape (optional)
Specifies whether vertices will be added to the output lines or polygons so their projected shape is more accurate.
- Unchecked—Extra vertices are not added to the output lines or polygons. This is the default.
- Checked—Extra vertices are added to the output lines or polygons, as needed, so their projected shape is more accurate.
8. Maximum Offset Deviation (optional)
Determines how far a projected line or polygon can deviate from its exact projected location when the Preserve Shape parameter is checked. The default is 100 times the xy tolerance of the spatial reference of the output dataset.
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