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| author | Kristian Evers <kristianevers@gmail.com> | 2018-04-11 23:58:42 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2018-04-11 23:58:42 +0200 |
| commit | 75f8841fcab60ee9c0c15e135ec3ebd10fc46d18 (patch) | |
| tree | e8fb5199327097bc6280099a4983d78a82374a22 | |
| parent | cb376cb8172896553d3d5b5d0995873264eaf64e (diff) | |
| parent | 38443f7545dad1d849a889921976fa94e9b76264 (diff) | |
| download | PROJ-75f8841fcab60ee9c0c15e135ec3ebd10fc46d18.tar.gz PROJ-75f8841fcab60ee9c0c15e135ec3ebd10fc46d18.zip | |
Merge pull request #929 from kbevers/nsper-updates
Nsper updates
| -rw-r--r-- | docs/source/operations/projections/nsper.rst | 23 | ||||
| -rw-r--r-- | test/gie/builtins.gie | 54 |
2 files changed, 76 insertions, 1 deletions
diff --git a/docs/source/operations/projections/nsper.rst b/docs/source/operations/projections/nsper.rst index 4a8651fc..3f46f2b4 100644 --- a/docs/source/operations/projections/nsper.rst +++ b/docs/source/operations/projections/nsper.rst @@ -4,7 +4,28 @@ Near-sided perspective ******************************************************************************** +The near-sided perspective projection simulates a view from a height +:math:`h` similar to how a satellite in orbit would see it. + ++---------------------+-------------------------------------------------------------+ +| **Classification** | Azimuthal. Neither conformal nor equal area. | ++---------------------+-------------------------------------------------------------+ +| **Available forms** | Forward and inverse spherical projection | ++---------------------+-------------------------------------------------------------+ +| **Defined area** | Global, although for one hemisphere at a time. | ++---------------------+-------------------------------------------------------------+ +| **Options** | ++---------------------+-------------------------------------------------------------+ +| `+h` | Height of the view point above the Earth and must be in | +| | the same units as the radius of the sphere. Required. | ++---------------------+-------------------------------------------------------------| +| `+lat_0` | Latitude (in degrees) of the view position. Defaults to 0. | ++---------------------+-------------------------------------------------------------+ +| `+lon_0` | Longitude (in degrees) of the view position. Defaults to 0. | ++---------------------+-------------------------------------------------------------+ + + .. image:: ./images/nsper.png :scale: 50% - :alt: Near-sided perspective + :alt: Near-sided perspective diff --git a/test/gie/builtins.gie b/test/gie/builtins.gie index 4f6d6a44..fb8a53c3 100644 --- a/test/gie/builtins.gie +++ b/test/gie/builtins.gie @@ -3347,6 +3347,60 @@ expect -0.001790493 0.000895247 accept -200 -100 expect -0.001790493 -0.000895247 +------------------------------------------------------------------------------- +Test north polar aspect +------------------------------------------------------------------------------- +operation +proj=nsper +R=1 +h=3 +lat_0=90 +------------------------------------------------------------------------------- +tolerance 0.1 mm +accept 0 90 +expect 0 0 +accept 45 45 +expect 0.4555 -0.4555 +roundtrip 100 +accept 0 0 +expect failure errno tolerance_condition + +direction inverse +accept 0 0 +expect 0 90 +accept 0 2 # projected coordinate is outside the sphere +expect failure errno tolerance_condition + +------------------------------------------------------------------------------- +Test south polar aspect +------------------------------------------------------------------------------- +operation +proj=nsper +R=1 +h=3 +lat_0=-90 +------------------------------------------------------------------------------- +tolerance 0.1 mm +accept 0 -90 +expect 0 0 +accept -45 -45 +expect -0.4555 0.4555 +roundtrip 100 +accept 0 0 +expect failure errno tolerance_condition + +------------------------------------------------------------------------------- +operation +proj=nsper +R=1 +h=3 +lat_0=45 +------------------------------------------------------------------------------- +tolerance 0.1 mm +accept 0 45 +expect 0 0 +accept 0 90 +expect 0 0.6442 +accept 0 0 +expect 0 -0.6442 +accept 45 45 +expect 0.4767 0.1396 +roundtrip 100 + + +------------------------------------------------------------------------------- +operation +proj=nsper +R=1 +h=0 +------------------------------------------------------------------------------- +expect failure errno h_less_than_zero + =============================================================================== New Zealand Map Grid |