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| author | Kristian Evers <kristianevers@gmail.com> | 2018-03-26 23:36:15 +0200 |
|---|---|---|
| committer | Kristian Evers <kristianevers@gmail.com> | 2018-03-27 11:37:13 +0200 |
| commit | 234eba764d7fea67b597d8f9ed5225e651f4a945 (patch) | |
| tree | 21895b6b3c38a93c2cb2dbe17f19115d22129587 /docs/source/operations/pipeline.rst | |
| parent | 0962d1ecf116e2eeeccfa6ce5c9613407691f38c (diff) | |
| download | PROJ-234eba764d7fea67b597d8f9ed5225e651f4a945.tar.gz PROJ-234eba764d7fea67b597d8f9ed5225e651f4a945.zip | |
Validate that units match between pipeline steps
As suggested in [0], steps in a pipeline are now checked for compliance.
If the right side units in step n differ from the left side units in
step n+1 the pipeline can't be constructed and an error is raised.
[0] https://lists.osgeo.org/pipermail/grass-dev/2018-March/088123.html
Diffstat (limited to 'docs/source/operations/pipeline.rst')
| -rw-r--r-- | docs/source/operations/pipeline.rst | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/docs/source/operations/pipeline.rst b/docs/source/operations/pipeline.rst index d7694041..abe98776 100644 --- a/docs/source/operations/pipeline.rst +++ b/docs/source/operations/pipeline.rst @@ -95,4 +95,17 @@ In the following the GRS80 ellipsoid will be applied to all steps. +step +proj=cart +inv +step +proj=merc +**5. Units of operations must match between steps.** + +.. versionadded:: 5.1.0 + +The output units of step *n* must match the expected input unit of step *n+1*. E.g., you can't +pass an operation that outputs projected coordinates to an operation that expects angular units +(degrees). An example of such a unit mismatch is displayed below. + +:: + + +proj=pipeline + +step +proj=merc # Mercator outputs projected coordinates + +step +proj=robin # The Robinson projection expects angular input |