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Update usage of false_easting and false_northing in projections #225

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Merged
erget merged 3 commits into from
Jan 28, 2020
Merged

Update usage of false_easting and false_northing in projections #225

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d970ee0
false easting and northing are optional (=0); fixed #212
Jan 7, 2020
4e15e9f
correct one type
Jan 7, 2020
da4a7a8
modified line breaks as requested by @erget
Jan 8, 2020
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64 changes: 33 additions & 31 deletions appf.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -31,8 +31,8 @@ __Map parameters:__::
* **`standard_parallel`** - There may be 1 or 2 values.
* **`longitude_of_central_meridian`**
* **`latitude_of_projection_origin`**
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)

__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular coordinates are identified by the **`standard_name`** attribute values **`projection_x_coordinate`** and **`projection_y_coordinate`** respectively.

Expand All @@ -52,8 +52,8 @@ grid_mapping_name = azimuthal_equidistant
__Map parameters:__::
* **`longitude_of_projection_origin`**
* **`latitude_of_projection_origin`**
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)

__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular coordinates are identified by the **`standard_name`** attribute values **`projection_x_coordinate`** and **`projection_y_coordinate`** respectively.

Expand All @@ -74,8 +74,8 @@ __Map parameters:__::
* **`latitude_of_projection_origin`**
* **`longitude_of_projection_origin`**
* **`perspective_point_height`**
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)
* **`sweep_angle_axis`**
* **`fixed_angle_axis`**

Expand Down Expand Up @@ -104,8 +104,8 @@ grid_mapping_name = lambert_azimuthal_equal_area
__Map parameters:__::
* **`longitude_of_projection_origin`**
* **`latitude_of_projection_origin`**
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)

__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular coordinates are identified by the **`standard_name`** attribute values **`projection_x_coordinate`** and **`projection_y_coordinate`** respectively.

Expand All @@ -127,8 +127,8 @@ __Map parameters:__::
* **`standard_parallel`** - There may be 1 or 2 values.
* **`longitude_of_central_meridian`**
* **`latitude_of_projection_origin`**
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)

__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular coordinates are identified by the **`standard_name`** attribute values **`projection_x_coordinate`** and **`projection_y_coordinate`** respectively.

Expand All @@ -150,8 +150,8 @@ grid_mapping_name = lambert_cylindrical_equal_area
__Map parameters:__::
* **`longitude_of_central_meridian`**
* Either **`standard_parallel`** or **`scale_factor_at_projection_origin`** (deprecated)
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)

__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular coordinates are identified by the **`standard_name`** attribute values **`projection_x_coordinate`** and **`projection_y_coordinate`** respectively.

Expand Down Expand Up @@ -188,8 +188,8 @@ grid_mapping_name = mercator
__Map parameters:__::
* **`longitude_of_projection_origin`**
* Either **`standard_parallel`** (EPSG 9805) or **`scale_factor_at_projection_origin`** (EPSG 9804)
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)

__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular coordinates are identified by the **`standard_name`** attribute values **`projection_x_coordinate`** and **`projection_y_coordinate`** respectively.

Expand Down Expand Up @@ -219,8 +219,8 @@ __Map parameters:__::
* **`latitude_of_projection_origin`**
* **`longitude_of_projection_origin`**
* **`scale_factor_at_projection_origin`**
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)

__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular coordinates are identified by the **`standard_name`** attribute values **`projection_x_coordinate`** and **`projection_y_coordinate`** respectively.

Expand All @@ -242,8 +242,8 @@ grid_mapping_name = orthographic
__Map parameters:__::
* **`longitude_of_projection_origin`**
* **`latitude_of_projection_origin`**
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)

__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular coordinates are identified by the **`standard_name`** attribute values **`projection_x_coordinate`** and **`projection_y_coordinate`** respectively.

Expand Down Expand Up @@ -271,8 +271,8 @@ __Map parameters:__::
* **`straight_vertical_longitude_from_pole`**
* **`latitude_of_projection_origin`** - Either +90. or -90.
* Either **`standard_parallel`** (EPSG 9829) or **`scale_factor_at_projection_origin`** (EPSG 9810)
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)

__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular coordinates are identified by the **`standard_name`** attribute values **`projection_x_coordinate`** and **`projection_y_coordinate`** respectively.

Expand All @@ -294,7 +294,7 @@ grid_mapping_name = rotated_latitude_longitude
__Map parameters:__::
* **`grid_north_pole_latitude`**
* **`grid_north_pole_longitude`**
* **`north_pole_grid_longitude`** - This parameter is option (default is 0).
* **`north_pole_grid_longitude`** - This parameter is optional (default is 0).

__Map coordinates:__:: The rotated latitude and longitude coordinates are identified by the **`standard_name`** attribute values **`grid_latitude`** and **`grid_longitude`** respectively.

Expand All @@ -312,8 +312,8 @@ grid_mapping_name = sinusoidal

__Map parameters:__::
* **`longitude_of_projection_origin`**
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)

__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular coordinates are identified by the **`standard_name`** attribute values **`projection_x_coordinate`** and **`projection_y_coordinate`** respectively.

Expand All @@ -336,8 +336,8 @@ __Map parameters:__::
* **`longitude_of_projection_origin`**
* **`latitude_of_projection_origin`**
* **`scale_factor_at_projection_origin`**
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)

__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular coordinates are identified by the **`standard_name`** attribute values **`projection_x_coordinate`** and **`projection_y_coordinate`** respectively.

Expand All @@ -360,8 +360,8 @@ __Map parameters:__::
* **`scale_factor_at_central_meridian`**
* **`longitude_of_central_meridian`**
* **`latitude_of_projection_origin`**
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)

__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular coordinates are identified by the **`standard_name`** attribute values **`projection_x_coordinate`** and **`projection_y_coordinate`** respectively.

Expand All @@ -384,8 +384,8 @@ __Map parameters:__::
* **`latitude_of_projection_origin`**
* **`longitude_of_projection_origin`**
* **`perspective_point_height`**
* **`false_easting`**
* **`false_northing`**
* **`false_easting`** - This parameter is optional (default is 0)
* **`false_northing`** - This parameter is optional (default is 0)

__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular
coordinates are identified by the **`standard_name`** attribute value
Expand Down Expand Up @@ -433,7 +433,8 @@ to a reference direction.
| Applied to all abscissa values in the rectangular
coordinates for a map projection in order to eliminate negative numbers. Expressed in
the unit of the coordinate variable identified by the
standard name **`projection_x_coordinate`**.
standard name **`projection_x_coordinate`**.
If **`false_easting`** is not provided it is assumed to be 0.
The formula to convert from the coordinate value as written in the **`projection_x_coordinate`**
(xf) to a value (x0) used in a transformation without **`false_easting`**, i.e. **`false_easting`**= 0, is:
x0 = xf -**`false_easting`**
Expand All @@ -444,7 +445,8 @@ to a reference direction.
| Applied to all ordinate values in the rectangular
coordinates for a map projection in order to eliminate negative numbers. Expressed in
the unit of the coordinate variable identified by the
standard name **`projection_y_coordinate`**.
standard name **`projection_y_coordinate`**.
If **`false_northing`** is not provided it is assumed to be 0.
The formula to convert from the coordinate value as written in the **`projection_y_coordinate`**
(yf) to a value (y0) used in a transformation without **`false_northing`**, i.e. **`false_northing`**= 0, is:
y0 = yf -**`false_northing`**
Expand Down