qc_coord_sign_test: Coordinates sign test

In sapfluxnet/sapfluxnetQC1: Package with functions related to sapfluxnet project data

Description

qc_coord_sign_test is an internal function to test if site coordinates signs are interchanged. It's needed by qc_fix_latlong_errors function.

Usage

qc_coord_sign_test(data, maps_folder = getwd(), special_countries = FALSE,
  parent_logger = "test")

Arguments

data	Data frame with data coming from qc_check_coordinates (with latitude, longitude, country and is_inside_country variables).
maps_folder	Folder route where the maps are stored, by default the working directory. It must be a character object and it must end without /.
special_countries	Logical indicating if the special approach to countries having positive and negative coordinates must be used. See Special countries section for details.

Details

Country coordinates sign is established by this function and testing if provided site coordinates are correct is made.

Value

Same data frame provided, with a two new columns, lat_changed and long_changed, two logicals indicating if the coordinates are sign exchanged

Special countries

There are special countries where border coordinates for longitude, latitude or both have negative and positive values. In this case, the normal approach of qc_coord_sign_test is not appropriate, and several tests involving the internal use of qc_check_coordinates must be made. If special_countries = TRUE is specified, then tests are made trying to dilucidate if only a change in the sign of one, latitude or longitude, is needed or, in the contrary, changing both of them is needed. There is one case that can not be covered by this approach: when changing sign of one of the coordinates AND changing both coordinates seem to fix the issue, as the correct option can not be assured.

See Also

Other Quality Check Functions: qc_check_coordinates, qc_download_maps, qc_fix_latlong_errors

sapfluxnet/sapfluxnetQC1 documentation built on May 29, 2019, 1:50 p.m.