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Diffstat (limited to 'docs/source')
| -rw-r--r-- | docs/source/projections/merc.rst | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/docs/source/projections/merc.rst b/docs/source/projections/merc.rst index a1361e45..9357fc03 100644 --- a/docs/source/projections/merc.rst +++ b/docs/source/projections/merc.rst @@ -20,7 +20,9 @@ The projection is conformal which makes it suitable for navigational purposes. +---------------------+----------------------------------------------------------+ | **Options** | +---------------------+----------------------------------------------------------+ -| `+lat_ts` | Latitude of true scale. Defaults to 0. | +| `+lat_ts` | Latitude of true scale. Defaults to 0.0 | ++---------------------+----------------------------------------------------------+ +| `+k_0` | Scaling factor. Defaults to 1.0 | +---------------------+----------------------------------------------------------+ @@ -40,11 +42,19 @@ Often inappropriately used for world maps since the regions near the poles cannot be shown [Evenden1995]_. -Example:: +Example using latitude of true scale:: $ echo 56.35 12.32 | proj +proj=merc +lat_ts=56.5 - 3470306.37 759599.90 + 3470306.37 759599.90 + +Example using scaling factor:: + + echo 56.35 12.32 | proj +proj=merc +k_0=2 + 12545706.61 2746073.80 + +Note that ``+lat_ts`` and ``+k_0`` are mutually excusive. +If used together, ``+lat_ts`` takes precedence over ``+k_0``. Mathematical definition ####################### |