[Proj] What is the difference between proj and cs2cs command?

kochizufan kochizufan at gmail.com
Tue Feb 18 11:52:27 EST 2014


I've believed for a long time that,

proj +proj=some_definition


cs2cs +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs +to

is same meaning.

But I tried this:

proj -f %.6f +proj=tmerc +lat_0=0 +lon_0=-62 +k=0.9995000000000001
+x_0=400000 +y_0=0 +ellps=clrk80 +towgs84=725,685,536,0,0,0,0 +units=m
-61.35 15.42 0
469737.400664	1704564.737169 0

cs2cs -f %.6f +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs +to
+proj=tmerc +lat_0=0 +lon_0=-62 +k=0.9995000000000001 +x_0=400000 +y_0=0
+ellps=clrk80 +towgs84=725,685,536,0,0,0,0 +units=m +no_defs
-61.35 15.42 0
468774.391590	1704156.539473 14.452425

These cases return different results.

And, I used pj_transform C function directly, from WGS84 to target
projection, it returns same result
with proj. 
(469737.400664  1704564.737169)

What is the difference between proj and cs2cs? 
My task is making test case of pj_transform function, which result I should


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