This page of the sample design dialog controls how samples are placed on the map.
This design page contains the following controls:
(Note: Not all of these controls will be active or visible for every sampling design.)
Sample Type |
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Point Samples |
Use sampling locations that represent a single point. |
Grid Cell Samples |
Use sampling locations that represent a square area (grid cell). |
Size of Grid Cell |
Length of side of square grid cell. |
Grid Cell Units |
Units associated with the size of the grid cell. |
Placement Method |
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Simple random sampling |
Places samples in sample areas in a random arrangement using the selected random number generator. |
Systematic grid sampling |
Places samples in sample areas in a systematic grid arrangement. |
Places a square grid over the entire site and randomly places samples within the square grids. |
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Places a rectangular grid over the entire site and places samples at an offset within the grids. |
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Check this box if you want to include existing sample locations as part of this sample design. |
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Grid Type |
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Square |
Use a square grid pattern for systematic grid placement. |
Triangular |
Use a triangular grid pattern for systematic grid placement. |
Rectangular |
Use a rectangular grid pattern for systematic grid placement. |
Rectangle Width/Height |
When using a rectangular grid pattern for systematic grid placement, this input specifies the width to height ratio of the rectangular grid. |
Z Placement |
When placing samples in a 3D sample area: |
Random |
Use a random Z coordinate. |
Random on Layers |
Randomly choose a Z coordinate from the Layer Z grid. |
On Each Layer |
Place one sample at each Z coordinate in the Layer Z grid at each location. |
3D Square Grid |
Arrange samples in a (X, Y, Z) square grid throughout the entire 3D space. |
Surface Only |
Place samples only on the top surface of the 3D space. (Most useful for sample areas with mapped elevations.) |
Layer Z grid |
Enter Z coordinates to be used for Z placement options 2 and 3. |
Surface Selection |
Use these options to choose surface types for sample placement: |
All Surfaces |
Default option. Choose this option to place samples on all surfaces, regardless of surface type. Will also place samples on surfaces that do not have a defined surface type. |
Specific Surfaces |
Choose this option to place samples on only selected surface types (see list below). |
Surface Type List |
Use this list to select which surface types to place samples. Any combination of surfaces can be selected. |