pplications
ENVI-MAG Manual B3-1
Chapter
Example
3
Survey procedures and
a sample survey
Introduction
B
Once you have considered all the factors as to the type of magnetometer survey
required, then you are ready to design and lay out a grid to cover the area of
interest. This chapter will cover some aspects of laying out a grid and actually
conducting a survey. Finally, a brief discussion of an actual survey undertaken of the
Columbia test site at the University of Waterloo in Ontario, Canada, will be
presented.
Survey do’ s and don’ ts
Laying out the grid
A survey grid usually consists of a base line and one or several tie lines. The base
line serves as a zero reference line for the grid, and the tie lines serve to correct
the skewness of the survey lines. From the base line are drawn survey lines
perpendicular to the base line.
With a square survey grid, the station separation on each line is identical to the
line separation.Therefore, every data point collected is on a corner of a square.
Typical environmental grids consist of survey lines spaced every metre or two,
with data points every metre. The following figure (Figure B-18), illustrates a
typical survey grid, with base lines at 0 and 40 and survey lines every two metres.
To Next Page
Loading...
Need help?
General