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Diffstat (limited to 'docs/source/operations/projections/ccon.rst')
| -rw-r--r-- | docs/source/operations/projections/ccon.rst | 48 |
1 files changed, 39 insertions, 9 deletions
diff --git a/docs/source/operations/projections/ccon.rst b/docs/source/operations/projections/ccon.rst index 8a858e38..f5ceed67 100644 --- a/docs/source/operations/projections/ccon.rst +++ b/docs/source/operations/projections/ccon.rst @@ -4,8 +4,10 @@ Central Conic ******************************************************************************** -This is central (centrographic) projection on cone tangent at ``lat_0`` latitude, -identical with ``conic()`` projection from ``mapproj`` R package. +.. versionadded:: 5.0.0 + +This is central (centrographic) projection on cone tangent at :option:``lat_1`` +latitude, identical with ``conic()`` projection from ``mapproj`` R package. +---------------------+----------------------------------------------------------+ | **Classification** | Conic | @@ -14,13 +16,16 @@ identical with ``conic()`` projection from ``mapproj`` R package. +---------------------+----------------------------------------------------------+ | **Defined area** | Global, but best used near the standard parallel | +---------------------+----------------------------------------------------------+ -| **Implemented by** | Lukasz Komsta | +| **Alias** | ccon | ++---------------------+----------------------------------------------------------+ +| **Domain** | 2D | +---------------------+----------------------------------------------------------+ -| **Options** | +| **Input type** | Geodetic coordinates | +---------------------+----------------------------------------------------------+ -| `+lat_1` | Latitude of standard parallel. | +| **Output type** | Projected coordinates | +---------------------+----------------------------------------------------------+ + .. image:: ./images/ccon.png :scale: 50% :alt: Central Conic @@ -44,13 +49,38 @@ The ATPOL coordinates can be achieved with with the following parameters: :: - +proj=ccon +lat_1=52 +lat_0=52 +lon_0=19 +axis=esu +a=6390000 +x_0=330000 +y_0=-350000 + +proj=ccon +lat_1=52 +lon_0=19 +axis=esu +a=6390000 +x_0=330000 +y_0=-350000 For more information see [Komsta2016]_ and [Verey2017]_. +Parameters +################################################################################ + +Required +------------------------------------------------------------------------------- + +.. option:: +lat_1=<value> + + Standard parallel of projection. + +Optional +------------------------------------------------------------------------------- + +.. include:: ../options/lon_0.rst + +.. include:: ../options/R.rst + +.. include:: ../options/x_0.rst + +.. include:: ../options/y_0.rst + + +Mathematical definition +################################################################################ + Forward projection -================== +------------------------------------------------------------------------------- .. math:: @@ -66,7 +96,7 @@ Forward projection Inverse projection -================== +------------------------------------------------------------------------------- .. math:: @@ -81,7 +111,7 @@ Inverse projection \lambda = \frac{\tan^{-1} \sqrt{x^2+y^2}}{\sin \phi_0} Reference values -================== +################################################################################ For ATPOL to WGS84 test, run the following script: |