Online-only Table 1.

Table of added columns.

variable added	to years
gps_altitude	2006
lu1_type	2006, 2009, 2012
lu1_perc	2006, 2009, 2012
lu2_type	2006, 2009, 2012
lu2_perc	2006, 2009, 2012
inspire_plcc1	2006, 2009, 2012
inspire_plcc2	2006, 2009, 2012
inspire_plcc3	2006, 2009, 2012
inspire_plcc4	2006, 2009, 2012
inspire_plcc5	2006, 2009, 2012
inspire_plcc6	2006, 2009, 2012
inspire_plcc7	2006, 2009, 2012
inspire_plcc8	2006, 2009, 2012
nuts3	2006, 2009, 2012, 2015
office_pi	2006, 2009, 2012
ex_ante	2006, 2009, 2012, 2015
car_latitude	2006, 2009, 2012, 2015
car_ew	2006, 2009, 2012, 2015
car_longitude	2006, 2009, 2012, 2015
gps_ew	2009, 2012, 2015
tree_height_maturity	2006, 2009
lm_plough_slope	2006, 2009, 2012, 2015
lm_plough_direct	2006, 2009, 2012, 2015
lm_stone_walls	2006, 2009, 2012, 2015
lm_grass_margins	2006, 2009, 2012, 2015
special_status	2006, 2009
lc_lu_special_remark	2006, 2009
cprn_cando	2006, 2009, 2012, 2015
cprn_lc	2006, 2009, 2012, 2015
cprn_lc1n	2006, 2009, 2012, 2015
cprnc_lc1e	2006, 2009, 2012, 2015
cprnc_lc1s	2006, 2009, 2012, 2015
cprnc_lc1w	2006, 2009, 2012, 2015
cprn_lc1n_brdth	2006, 2009, 2012, 2015
cprn_lc1e_brdth	2006, 2009, 2012, 2015
cprn_lc1s_brdth	2006, 2009, 2012, 2015
cprn_lc1w_brdth	2006, 2009, 2012, 2015
cprn_lc1n_next	2006, 2009, 2012, 2015
cprn_lc1e_next	2006, 2009, 2012, 2015
cprn_lc1s_next	2006, 2009, 2012, 2015
cprn_lc1w_next	2006, 2009, 2012, 2015
cprn_urban	2006, 2009, 2012, 2015
cprn_impervious_perc	2006, 2009, 2012, 2015
eunis_complex	2006, 2009, 2012, 2015
grassland_sample	2006, 2009, 2012, 2015
grass_cando	2006, 2009, 2012, 2015
erosion_cando	2006, 2009, 2012, 2015
bio_sample	2006, 2009, 2012, 2015
soil_bio_taken	2006, 2009, 2012, 2015
bulk0_10_sample	2006, 2009, 2012, 2015
soil_blk_0_10_taken	2006, 2009, 2012, 2015
bulk10_20_sample	2006, 2009, 2012, 2015
soil_blk_10_20_taken	2006, 2009, 2012, 2015
bulk20_30_sample	2006, 2009, 2012, 2015
soil_blk_20_30_taken	2006, 2009, 2012, 2015
standard_sample	2006, 2009, 2012, 2015
soil_std_taken	2006, 2009, 2012, 2015
organic_sample	2006, 2009, 2012, 2015
soil_org_depth_cando	2006, 2009, 2012, 2015
crop_residues	2006, 2009, 2012, 2015
obs_radius	2018
soil_taken	2018
soil_crop	2018
transect	2006, 2018
letter_group	ALL
file_path_thumb_n	ALL
file_path_thumb_s	ALL
file_path_thumb_w	ALL
file_path_thumb_e	ALL
file_path_thumb_p	ALL
year	ALL