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GIS Analysis

3D Analysis Tools in GIS – Bend It in 3D

By: GIS Geography · Last Updated: November 10, 2020

3D Analysis Tools

3D analysis has been a growing trend in GIS because it’s a better representation of the real world.

It’s not only for a pretty picture. For some types of problems, 3D analysis is sometimes the only way you can solve it.

There has also been an explosion in 3D data types that’s driving this demand. For example, LiDAR, BIM, UAV, textured meshes, photogrammetry, boreholes, IoT, augmented reality, inSAR, space-time cubes are examples of 3D data.

But what kind of tools are available? Here are some of the common types of 3D analysis in GIS:

3D Geometric Analysis

These 3D tools perform overlay and proximity analysis in 3D based on the geometry of the features.

Buffer 3D

Buffer 3D

Builds a 3-dimensional buffer around points, polylines, or polygons.

Intersect 3D

Intersect 3D

Performs the intersection of 3-dimensional features maintaining overlapping features.

Near 3D

Near 3D

Measures the distance in three dimensions from each input feature to the nearest feature.

Inside 3D

Inside 3D

Identifies any features that are inside or partially inside a 3D feature class.

Union 3D

Union 3D

Combines input data layers into a single composite layer, preserving the boundaries and attributes from all input features

Visibility and Points of observation

This group of 3D tools focuses on what’s visible from an observer’s point of view. These tools are common in miliary, city planning and

Line of Sight

Line of Sight

Identifies obstruction and non-obstruction parts of a straight from an observer.

Shadow Analysis

Shadow Tool

Evaluates the amount of shadow and impact for the proposed building in an urban setting.

Skyline

Skyline Tool

Displays visible and obstructed areas like a 3D fan pointing towards from an observer point of view.

Viewshed

Viewshed

Determines locations visible to an observer in all directions with the output as a visibility raster.

Surface and Area Calculations

This group of 3D analysis tools focuses on measurements of surfaces and volumes.

Volume

Volume Tool

Calculates the amount of space above or below a reference

Surface Area

Surface Area

Calculates the total area of the surface of a three-dimensional object

Cut/Fill

Cut/Fill Analysis

Identifies the areas and volume of the surface that have been modified by the removal or addition of surface material.

3D Interpolation

3D Interpolation

3D Interpolation

Interpolates surface estimates unknown values by adding a third dimension in its analysis such as kriging, IDW and spline.

3D Analysis Tools

Although 3D analysis adds an extra level of complexity, it’s a better representation of reality.

But it’s not just for its powerful visualizations, 3D analysis adds the third dimension.

By adding 3D data, you can explore visibility, viewsheds, skylines, and all sorts of neat geometrical analysis tools.

How do you use 3D in GIS? What types of 3D analysis do you perform? Please let us know with a comment below.

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