em38_surveyline | R Documentation |
This function processes an EM38 survey line into a data frame, which may be spatial.
em38_surveyline(
survey_line = NULL,
hdop_filter = NULL,
time_filter = NULL,
fix_filter = NULL
)
survey_line |
a decoded survey line from |
hdop_filter |
Numeric, discard GPS data where the Horizontal Dilution of Precision is greater than this number. Defaults to 3 metres. Set to NULL to keep all readings. |
time_filter |
Numeric, discard readings taken more than |
fix_filter |
Select readings with a minimum quality of GPS fix. Options are:
To filter on multiple options, supply a vector e.g. |
If valid GPS data is present, an 'sf' data frame with sfc_POINT geometry. Otherwise, if valid instrument data is present, a data frame. Otherwise, a string explaining failure to process.
Inclusion of comments is yet to be implemented.
data('n38_demo')
n38_chunks <- n38_chunk(n38_demo)
n38_decoded <- n38_decode(n38_chunks)
demo_line_1 <- em38_surveyline(n38_decoded[[2]], 3)
demo_line_2 <- em38_surveyline(n38_decoded[[2]], 3, 0.2)
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