latitude error when converting ESPG:3857 to ESPG:4326 with proj4js about proj4js

[calvinmetcalf]

first off you can rewrite that as

var firstProjection = "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +units=m +k=1.0 +nadgrids=@null +no_defs"
proj4(firstProjection).inverse([4156404,7480076.5])

as for why ... so far I've ruled out issues with sphere vs ellipses as it is too small a difference to account for that.

[calvinmetcalf]

oh right ESPG:3857 is the projection that every uses a different number for. For parsing it from WKT I seem to remember having to put a manual fix in related to it claiming to be a sphere abut also having a reverse flattening specified.

[ql]

Um, I'm not that good in projections =
Did you mean fix in the library code or just setting proper Proj.4 string?

[calvinmetcalf]

sorry for the confusion I haven't figured out the what the issue yet is, in the first comment I was telling you an easier way you could specify the exact same thing, in the second comment I was more or less thinking out loud,

[madair]

The issue has to do with parsing the nadgrids parameter correctly to set datumCode=none. I have a fix for this, is there a way to make a pull request and associate it with this issue? GIthub aways seems to want to create a new issue for me.

[calvinmetcalf]

@madair create a new issue, and reference this one in it by mentioning it's number (#65) pulls are always separate from the issues in case we need to close the pull for reasons unrelated to the issue.

[calvinmetcalf]

looks like #66 closes this one