This function converts w80-files, an ascii-format with 80 characters per line for spatial point data used by the German Waterways and Shipping Administration (WSV). Every single row codes for one point:
|_1_|2_|_3______|4|____________5______________|_______6_______|_____7___|_8_|
W0701 55 2594611 1330938065557502425901108035 5795591108035 Bu.15 01
W0701 57 2594611 7330932961457502484041108035 5538181108035 Bu.15 01
Within each row very specific sections code for specific attributes:
| section | column(s) | attribute | column name in result |
| 1 | 1 | state id, here W=WSV | sid |
| 1 | 2-5 | Federal Waterway ID | fwid |
| 2 | 6-8 | WSV point type | wsvpt |
| 3 | 9 | blank | - |
| 3 | 10-15 | river station (km) | station |
| 4 | 16 | bank: 1 left, 2 right | bank |
| 4 | 17-20 | continuous id | id |
| 5 | 21-30 | easting in GK-coordinates | x |
| 5 | 31-40 | northing in GK-coordinates | y |
| 6 | 41-46 | datum of measurement | date_coor |
| 6 | 47 | accuracy | acc_coor |
| 6 | 48-54 | elevation | z |
| 6 | 55-60 | date of the elevation measurement | date_z |
| 6 | 61 | accuracy of the elevation measurement | acc_z |
| 6 | 62-64 | type of measurement | tom |
| 7 | 65-84 | comment | comment |
| 8 | 85-86 | point status | status |
In a second step these points are aggregated to a
sfc_LINESTRING using the grouping column id.
Usage
w80ToSFL(
filename,
crs,
id = c("sid", "fwid", "wsvpt", "station", "bank", "id", "x", "y", "date_coor",
"acc_coor", "z", "date_z", "acc_z", "tom", "comment", "status", "lat", "lon",
"station_int", "station_c")
)Examples
options("hydflood.datadir" = tempdir())
library(hydflood)
c <- st_crs("EPSG:25833")
filename <- tempfile(fileext = ".w80")
# write temporary w80 file
cat("W0701 55 2594611 1330938065557502425901108035 5795591108035 Bu.15 01\n",
file = filename)
cat("W0701 57 2594611 7330932961457502484041108035 5538181108035 Bu.15 01\n",
file = filename, append = TRUE)
# import temporary w80 file as sf LINESTRING
sl <- w80ToSFL(filename, c, "station_int")