[Proj] invgeod results for small distances
Hermann Peifer
peifer at gmx.eu
Wed Feb 22 23:59:09 EST 2012
Hi All,
I am wondering if I am the only one who is somewhat puzzled with
invgeod's results for small distances. If not: would it be worth fixing
for the upcoming release?
Hermann
# This looks reasonable for a difference in the 6th decimal
[peifer at whitefish:~]> echo 0 0 0 .000001 | invgeod +ellps=WGS84
90d -90d 0.134
# This should then be 0.013 for the 7th decimal, but it isn't :-(
[peifer at whitefish:~]> echo 0 0 0 .0000001 | invgeod +ellps=WGS84
-2147483648d-2147483648'-nan" -2147483648d-2147483648'-nan" -nan
# This isn't true in real life, but at least better than Not-A-Number
[peifer at whitefish:~]> echo 0 0 0 .0000001 | invgeod +ellps=sphere
90d -90d 0.000
More information about the Proj
mailing list