cs suggestion: Outside bounds warning
Hello A strange rotation was encountered relative to the grid, when playing with cs OSGB:SN and cs EPSG:27700 In the end this was tracked down to the fact that the 300000 400000, was still within all the fixes, which is wrong, but this put it well outside the SN area, and hence the rotation. (or that is what we think) Which lead me to the thought, maybe therion should warn, but continue if it finds an co-ordinate outside the area covered by the cs selected? Not sure if this is possible (easy) to do, but in this case would have saved lots of head scratching. Andrew
Which led me to the thought, maybe therion should warn, but continue if it finds an co-ordinate outside the area covered by the cs selected?
I'll second that. A couple of years ago I was trying to work out why north became south! It was a cs out of range error due to a mistyped digit. Bruce
Which led me to the thought, maybe therion should warn, but continue if it finds an co-ordinate outside the area covered by the cs selected?
I'll second that. A couple of years ago I was trying to work out why north became south! It was a cs out of range error due to a mistyped digit.
It is not trivial for projected coordinate systems. It would be necassary to specify the range for each CS used. Valid ranges for some (not all) EPSG codes are listed at http://spatialreference.org/. Perhaps the realistic implementation would be to let the user specify valid range for any CS he defines (CS definition is not supported yet, but planned). Then if you want to be sure with your coordinates, just define custom CS by copying EPSG definition and add valid range from http://spatialreference.org/. Martin
Thought that might be the case, but always worth a quick question, some think I think are really difficult seem to get done very swiftly thanks Andrew On 14/02/11 12:56, Martin Budaj wrote:
Which led me to the thought, maybe therion should warn, but continue if it finds an co-ordinate outside the area covered by the cs selected?
I'll second that. A couple of years ago I was trying to work out why north became south! It was a cs out of range error due to a mistyped digit.
It is not trivial for projected coordinate systems. It would be necassary to specify the range for each CS used. Valid ranges for some (not all) EPSG codes are listed at http://spatialreference.org/.
Perhaps the realistic implementation would be to let the user specify valid range for any CS he defines (CS definition is not supported yet, but planned). Then if you want to be sure with your coordinates, just define custom CS by copying EPSG definition and add valid range from http://spatialreference.org/.
Martin _______________________________________________ Therion mailing list Therion@speleo.sk http://mailman.speleo.sk/mailman/listinfo/therion
participants (3)
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Andrew Atkinson -
Bruce -
Martin Budaj