Reference

All functions
cc876	Migrate Technology Ltd demo data
land	Land area polygon
likelihood()	Log likelihood cost function
log_lux()	Simulate illuminance value
read_deg_lux()	Read lux and deg files
skytrackr()	Sky (illuminance) location estimation routine
stk_cluster()	Cluster geolocator co-variates
stk_fit()	Fit illuminance (lux) profile
stk_map()	Plot skytrackr results
stk_mask()	Generate a land surface mask
stk_profile()	Plot seasonal profiles
stk_read_glf()	Read Swiss Ornithology institute GLF files
stk_read_lux()	Read Migrate Technology .lux files
stk_screen_twl()	Twilight screening routine