aboutsummaryrefslogtreecommitdiff
path: root/docs/source/operations/options
diff options
context:
space:
mode:
authorKristian Evers <kristianevers@gmail.com>2018-05-24 15:22:43 +0200
committerGitHub <noreply@github.com>2018-05-24 15:22:43 +0200
commit0b5c3622e37dcf697db45e8db05fd4ebf045674b (patch)
tree691d5f68186dd80c0d197ad5b9b862f113ea042f /docs/source/operations/options
parent019360766a3d654d8626a3b6470f2a39364f7f97 (diff)
downloadPROJ-0b5c3622e37dcf697db45e8db05fd4ebf045674b.tar.gz
PROJ-0b5c3622e37dcf697db45e8db05fd4ebf045674b.zip
Temporal gridshifting (#1015)
Temporal gridshifts allow [h|v]gridshift operations to be used as step functions in a pipeline. This is useful in transformations dealing with deformations caused by earthquakes. See the included documentation for details.
Diffstat (limited to 'docs/source/operations/options')
-rw-r--r--docs/source/operations/options/t_epoch.rst3
-rw-r--r--docs/source/operations/options/t_final.rst7
2 files changed, 10 insertions, 0 deletions
diff --git a/docs/source/operations/options/t_epoch.rst b/docs/source/operations/options/t_epoch.rst
new file mode 100644
index 00000000..76a4473a
--- /dev/null
+++ b/docs/source/operations/options/t_epoch.rst
@@ -0,0 +1,3 @@
+.. option:: +t_epoch=<time>
+
+ Central epoch of the transformation.
diff --git a/docs/source/operations/options/t_final.rst b/docs/source/operations/options/t_final.rst
new file mode 100644
index 00000000..37908209
--- /dev/null
+++ b/docs/source/operations/options/t_final.rst
@@ -0,0 +1,7 @@
+.. option:: +t_final=<time>
+
+ Final epoch that the coordinate will be propagated to after transformation.
+ The special epoch *now* can be used instead of writing a specific period in
+ time. When *now* is used, it is replaced internally with the epoch of the
+ transformation. This means that the resulting coordinate will be slightly
+ different if carried out again at a later date.