Release announcement: PROJ 5.1.0

Downloads are here:

Thanks to everyone who contributed to this release.

The PROJ dev team

Function proj_errno_string() added to proj.h API (#847)
Validate units between pipeline steps and ensure transformation sanity (#906)
Print help when calling cct and gie without arguments (#907)
CITATION file added to source distribution (#914)
Webmercator operation added (#925)
Enhanced numerical precision of forward spherical Mercator near the Equator (#928)
Added –skip-lines option to cct (#923)
Consistently return NaN values on NaN input (#949)
Removed unused src/org_proj4_Projections.h file (#956)
Java Native Interface bindings updated (#957, #969)
Horizontal and vertical gridshift operations extended to the temporal domain (#1015)

Handle nan float cast overflow in PJ_robin.c and nad_intr.c (#887)
Avoid overflow when Horner order is unreasonably large (#893)
Avoid unwanted NaN conversions in etmerc (#899)
Avoid memory failure in gie when not specifying x,y,z in gie files (#902)
Avoid memory failure when +sweep is initialized incorrectly in geos (#908)
Return HUGE_VAL on erroneous input in ortho (#912)
Handle commented lines correctly in cct (#933)
Avoid segmentation fault when transformation coordinates outside grid area in deformation (#934)
Avoid doing false easting/northing adjustments on cartesian coordinates (#936)
Thread-safe creation of proj mutex (#954)
Avoid errors when setting up geos with +lat_0!=0 (#986)
Reset errno when running proj in verbose mode (#988)
Do not interpolate node values at nodata value in vertical grid shifts (#1004)
Restrict Horner degrees to positive integer values to avoid memory allocation issues (#1005)