Environmental Engineering Reference
In-Depth Information
Fig. 2.4 Field topic example. Note the descriptive details and map to help interpret how the
survey was completed and where the benchmark (BM) is located
include, shot number (a number 1 through n), X coordinate (easting), Y coordinate
(northing), Z coordinate (elevation), and a comment column where notes about
each shot can be recorded. See Figs.
2.4
and
2.5
for field topic examples.
The units of measurement used in each column should be explicitly noted in the
column heading, and the units should not change within a column. The numerical
values in the columns should reflect the precision of the measurement. For
elevations, we commonly read to the millimeter, so an elevation entry might be
3.235 or 4.210, using the zero as a placeholder to show that we are still reading
to the millimeter. Harrelson et al. (
1994
) is an excellent reference for standard
environmental survey notes and abbreviations.
2.3.2 Surveying in the Field
Bathymetric survey design is driven by the goals and the available survey tools.
Based on the available equipment (Table
2.1
) and desired products (Table
2.2
), the
appropriate survey methods can be selected. For example, if the site is large, but
