I have a list of
proj4 calls. Some of them have one format and some have another, I've been told they are equivalent. Is that so? If so, which one should I use?
for example, for
ETRS89 / UTM zone 20N:
+proj=utm +zone=20 +ellps=GRS80 +towgs84=0000000 +units=m +no_defs +proj=utm +zone=20 +ellps=WGS84 +datum=WGS84 +units=m +no_defs