Grid of points

Pix4Dsurvey distant outlier filter icon

Distant Outlier Filter

Pix4Dsurvey terrain filter feature icon

Terrain filter

Pix4Dsurvey grid of points feature icon

Grid of points

Pix4Dsurvey TIN feature icon

TIN

The Grid of points tool helps to automate the creation of spot elevations and allow drastic simplification of the number of point cloud points. No new points are created, only existing points from the input data are used. 

Two types are available:

  • Regular grid is generated based on the selected sampling distance between points.
  • Smart grid creates points only where changes in terrain occur.
 
Example: Comparison of the results of Regular and Smart grid of points process. Notice how the Smart option generates points only where changes in terrain occur. Despite using the same Sample distance, the Smart grid generated significantly fewer points which makes the output files lighter and easier to import into CAD or GIS software. 

Pix4Dsurvey_grid_of_points_regular_points.jpg

Regular grid (293.290 points)
Sample distance: 1 m

Pix4Dsurvey_grid_of_points_regular_points_TIN.jpg

Regular grid and TIN

 

Pix4Dsurvey_grid_of_points_regular_TIN.jpg

TIN

 

Pix4Dsurvey_grid_of_points_smart_points.jpg

Smart grid (15000 points)
Minimum grid spacing: 1 m
Maximum number of grid points: 15000
Maximum elevation variation: 1 m

Pix4Dsurvey_grid_of_points_smart_points_TIN.jpg

Smart grid and TIN



Pix4Dsurvey_grid_of_points_smart_TIN.jpg

TIN



 
Access:
  • Click Process Pix4Dsurvey process icon or,
  • on the Menu bar, click Process > Grid of points or,
  • on the Content panel, click Grid of points > Pix4Dsurvey_processes_button.png.

Processing options

Input point cloud

Defines the point clouds used for the Grid of points process:

  • All: All point clouds in the Content > Point clouds are used for processing. 
  • Only visible - default. Only visible point clouds in the Content > Point clouds and Terrain classes are used for processing.
  • Terrain - default if Terrain points are available: All points in the Terrain class are used for processing. Only available after the Terrain filter is processed.
  • Non-terrain: All points in the Non-terrain class are used for processing. Only available after the Terrain filter is processed.
 
Example: When the Terrain option is selected, only points classified as terrain class are used for processing.

Pix4Dsurvey_terrain_filter_input.jpg

Only the Terrain class is used for processing.

Regular grid of points

A Regular grid is a simple rectangular grid that is decimated based on the selected Sample distance between points.

  • Sample distance [units]: Determines the grid size:
    • 0.1 m - 30 m, 2.5 m - default.
    • 0.3 ft - 100 ft, 8 ft - default.

Smart grid of points

A Smart grid attempts to generate just the most important points that define the terrain.

Based on the grid spacing, the number of grid points, and elevation variations the algorithm avoids creating redundant points on planar areas and focuses on generating points only where changes in terrain occur.

The following parameters can be adjusted: 

  • Minimum grid spacing [units]: The initial grid spacing that is used as a starting point for finding the most important points.
    • 0.1 m - 30 m, 2.5 m - default.
    • 0.3 ft - 100 ft, 8 ft - default.
  • Maximum number of grid points: The maximum possible number of grid points in the final result.
    • 3 - 500000, 1000 -  default
  • Maximum elevation variation [units]: The maximum elevation variation from neighboring points.
    • 0.01 m - 5 m, 0.05 m - default
    • 0.03 ft - 16 ft, 0.15 ft - default

Results

 
Access: Results of the Grid of points process are available in the Content - Pix4Dsurvey_grid_of_points.png Grid of points panel.

Pix4Dsurvey_grid_of_points_results.jpg

A regular grid of points (yellow points) generated only using the terrain points with a sample distance of 2.5 m.

 
Tip: Significantly fewer points are included in the results of the Grid of points process than in the input point clouds. We recommend right-clicking on the Grid of Points in the Content panel and increase the size of points for better visibility.

Export

The result of the Grid of Points process can be exported in .dxf and .shp format. More in the Export article.

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