PROJ/src/transformations, branch 6.0

Helmert: avoid potential division by zero

2019-03-17T07:11:34+00:00

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=11893
Credit to OSS Fuzz

Use 1st eccentricity instead of 2nd eccentricity

2019-03-16T13:04:13+00:00

By mistake the second eccentricity was used in a few places in the
Molodensky transform. According to the literature the first eccentricity
should always be used in the eccentricity.

This only affects the output slightly. Reported test coordinates
differed by less than a millimeter.

Fixes #1321

Molodensky: avoid division by zero

2019-03-15T10:44:49+00:00

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=13069
Credit to OSS Fuzz

Apply multiplier in proj_vgrid_value()

2019-02-20T12:21:15+00:00

vgridshift: propagate multiplier to avoid false-positive detection of nodata values in the grids with US VERTCON grids that are in millimeters

2019-02-20T10:02:53+00:00

deformation: Replace +t_obs with +dt

2019-02-14T13:55:23+00:00

The +t_obs parameter was confusing for users since it effectively
overwrote the observation time in input coordinates. To make it more clear
what is the operation is doing, users are now required to directly specify
the time span for which they wish to apply a given deformation. The parameter
+dt has been added for that purpose. The new parameter is mutually
exclusive with +t_epoch. +dt is used when deformation
for a set amount of time is needed and +t_epoch is used (in
conjunction with the observation time of the input coordinate) when
deformation from a specific epoch to the observation time is needed.

Reverse direction of deformation operations/transformations/deformation

2019-02-14T11:00:45+00:00

Changed the direction of dt-calculation to follow the same convention as
helmert. Changed from dt = t_c - t_obs to dt = t_obs - t_c, which
effectively reverses the direction of the operation. Existing projstrings
using deformation can simply reverse the direction of the operation to
achieve the same results as before this commit.

Remove +t_obs parameter from helmert operation

2019-02-01T11:59:44+00:00

Rename PJ_IO_UNITS_ANGULAR to PJ_IO_UNITS_RADIANS

2019-01-03T14:31:38+00:00

This communicates better what the unit actually is. It also opens the
door for potentially adding PJ_IO_UNITS_DEGREES in the future in order
to coordinates in degrees correctly as well.

Merge projects.h into proj_internal.h

2018-12-30T20:48:56+00:00