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switching between (sub)grids (fixes #1663)
Given in.txt with
53.999759140 5.144478208 252.6995
Before the fix,
cct -t 0 -d 4 +proj=pipeline +step +proj=axisswap +order=2,1,3,4 +step +proj=hgridshift +inv +grids=rdtrans2018.gsb +step +proj=vgridshift +grids=naptrans2018.gtx +step +proj=sterea +lat_0=52.156160556 +lon_0=5.387638889 +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel in.txt
returned:
139079.8814 668306.0302 212.1724 0.0000
It now returns:
139079.8850 668306.0458 212.1724 0.0000
which meets with the 1mm accuracy the expected result of test point
```
30010049 53.999759140 5.144478208 252.6995 139079.8850 668306.0460 212.1723
```
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- Tests should use unified diff with expected results
- Show CMake build compile commands (VERBOSE=1)
- Travis CI only has two cores, so "-j2" is sufficent
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All other tests use PROJ_LIB, and allow it to be overridden from the
command-line, so do the same here.
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