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etiennesky / profiletool

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Warning if canvas projection differs from data #22

Open borysiasty opened 8 years ago

borysiasty commented 8 years ago

Issue moved from hub.qgis.org Feature request #9452 Added by Joshua Arnott (@snorfalorpagus I guess it could be you?) 2014-01-29

It appears that the profile tool uses the current map canvas projection for calculations of length, rather than the projection of the data when using an existing polyline. This is a useful feature, but I think it needs to be more clear that this is happening.

I've just had to correct a whole batch of data, because I added an OpenLayers basemap in before running the tool. I expected that because both datasets (raster and vector) were in the same projection it would use that.

Discussion

@etiennesky:

I see it as rather obvious that calculations are done using the map/project projection. Anyway, how do you suggest this warning/information would be displayed to the user?

[waiting for a feedback]

snorfalorpagus commented 8 years ago

@borysiasty Yes that's me.

My confusion came from the fact that most other geoprocessing tools function using the data as it is stored, generally not accounting for projection at all. I just see the map canvas as a view into the data and not something that should affect calculation.

borysiasty commented 7 years ago

@snorfalorpagus: maybe #34 would be better?

snorfalorpagus commented 7 years ago

I think that #34 would be a useful feature, but I would still have use for cartesian measurements for consistency with other analysis.