Sensors & Software Noggin 100, User Manual, Page: 121 / 162

Noggin 13-Survey & Map Mode
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13.3.4 Grid Parameters
The Grid Parameters settings allow the user to view and modify settings specific to collecting
data in organized grids. This includes the grid dimensions, line spacing, grid type and survey
format.
Data are normally collected on a grid if the user is interested in displaying the data as a 3D
volume (using the EKKO_Mapper 3D software) or as a plan map (using the EKKO_Mapper
software). Producing accurate 3D volumes or plan maps is easier if the field survey is properly
designed and data are collected correctly.
Positional accuracy of each line is vital if the user wants to be able to relocate targets of interest
after the data have been processed.
For linear targets like pipes and utilities, the best GPR response occurs when the GPR survey
line crosses the target at right angles. If possible, it is always best to run GPR survey lines
perpendicular to the direction of linear targets.
For inexperienced surveyors, laying out a grid with straight lines and all corners at 90
degree angles can be difficult. Sensors & Software provides a product called EasyGrid to
make laying out an accurate grid simple. Contact Sensors & Software for more details.
13.3.4.1 Grid Type
The Grid Type asks specifically the way that the area of the grid is to be covered by the survey
lines. Survey lines can be either a set of parallel lines in the X axis direction (
Figure 13-10 ), a set
of parallel lines in the Y axis direction ( Figure 13-11 ), or, for complete coverage, parallel lines in
both the X and Y direction ( Figure 13-12 ).