3D Analyst Tools ArcToolbox

Change Terrain Resolution Bounds, Create Terrain

Change Terrain Resolution Bounds

How to Use Change Terrain Resolution Bounds Tool in ArcToolbox ArcMap ArcGIS ??

Change Terrain Resolution Bounds

Change Terrain Resolution Bounds Tool, Terrain Dataset Toolset, Data Management Toolset, 3D Analyst Toolbox:

Change Terrain Resolution Bounds

Changes the pyramid levels at which a feature class will be enforced for a given terrain dataset.

1. Input Terrain

The terrain dataset to process.

2. Input Feature Class

The feature class referenced by the terrain that will have its pyramid-level resolutions modified.

3. Lower Pyramid Resolution (optional)

The new lower pyramid-level resolution for the chosen feature class.

4. Upper Pyramid Resolution (optional)

The new upper pyramid-level resolution for the chosen feature class.

5. Contributes to Overview (optional)

Specifies whether the feature class will contribute to the overview of the terrain dataset.

• Checked—Enforces the feature class at the overview display of the terrain dataset. This is the default.
• Unchecked—Omits the feature class from the overview display of the terrain dataset.

 Create Terrain

How to Use Create Terrain Tool in ArcToolbox ArcMap ArcGIS ??

Create Terrain

Create Terrain Tool, Terrain Dataset Toolset, Data Management Toolset, 3D Analyst Toolbox

Create Terrain

Creates a new terrain dataset.

Create Terrain Dataset:

1. Input Feature Dataset

The feature dataset that will contain the terrain dataset.

2. Output Terrain

The name of the terrain dataset.

3. Average Point Spacing

The average horizontal distance between the data points that will be used in modeling the terrain. Sensor based measurements, like photogrammetric, lidar, and sonar surveys, typically have a known spacing that should be used. The spacing should be expressed in the horizontal units of the feature dataset's coordinate system.

4. Maximum Overview Size (optional)

The terrain overview is akin to the image thumbnail concept. It is the coarsest representation of the terrain dataset, and the maximum size represents the upper limit of the number of measurement points that can be sampled to create the overview.

5. Config Keyword (optional)

The configuration keyword for optimizing the terrain's storage in an enterprise database.

6. Pyramid Type (optional)

The point thinning method used to construct the terrain pyramids.

• WINDOWSIZE—Thinning is performed by selecting data points in the area defined by a given window size for each pyramid level using the criterion specified in the Window Size Method parameter.
• ZTOLERANCE—Thinning is performed by specifying the vertical accuracy of each pyramid level relative to the full resolution of the data points.

7. Window Size Method (optional)

The criterion used for selecting points in the area defined by the window size. This parameter is only applicable when Window Size is specified in the Pyramid Type parameter.

• ZMIN—The point with the smallest elevation value.
• ZMAX—The point with the largest elevation value.
• ZMEAN—The point with the elevation value closest to the average of all values.
• ZMINMAX—The points with the smallest and largest elevation values.

8. Secondary Thinning Method (optional)

Specifies additional thinning options to reduce the number of points used over flat areas when Window Size pyramids are being used. An area is considered flat if the heights of points in an area are within the value supplied for the Secondary Thinning Threshold parameter. Its effect is more evident at higher-resolution pyramid levels, since smaller areas are more likely to be flat than larger areas.

• NONE—No secondary thinning will be performed. This is the default.
• MILD—Works best to preserve linear discontinuities (for example, building sides and forest boundaries). It is recommended for lidar that includes both ground and nonground points. It will thin the fewest points.
• MODERATE—Provides a good trade-off between performance and accuracy. It does not preserve as much detail as mild thinning but comes nearly as close while eliminating more points overall.
• STRONG—Removes the most points but is less likely to preserve sharply delineated features. Its use should be limited to surfaces where slope tends to change gradually. For example, strong thinning would be efficient for bare-earth lidar and bathymetry.

9. Secondary Thinning Threshold (optional)

The vertical threshold used to activate secondary thinning with the Window Size filter. The value should be set equal to or larger than the vertical accuracy of the data.

The point features that represent the LAS points detected within the specified proximity of the input features.

Output Geometry Type (optional)

Specifies the geometry of the output point features that represent the LAS points found within the specified proximity of the input features.

·MULTIPOINT—Multipoint features that will have multiple points in each row.

·POINT—Single-point features that will have a unique row for each identified LAS point.

New Class Code (optional)

The class code value that will be used to reclassify the points found within the search radius of the input features.

Compute Statistics (optional)

Specifies whether statistics should be computed for the LAS files referenced by the LAS dataset. Computing statistics provides a spatial index for each LAS file, which improves analysis and display performance. Statistics also enhance the filtering and symbology experience by limiting the display of LAS attributes, like classification codes and return information, to values that are present in the LAS file.

·Checked—Statistics will be computed.

·Unchecked—Statistics will not be computed. This is the default.