[Qgis-developer] QGIS Crash - Serious problem in 2x

[Bernhard Ströbl]

Hi,

IMHO a scale bar in degrees doesn't make sense at all apart from being 
unused to readers of the map. Because one degree in latitude is always 
(uhmm if I recall correctly) 110 km, in longitude this is only true for 
the equator, the closer you get to the poles the less km per degree in 
longitude (until 0 at the pole itself). If you display only a small part 
of the earth you migth manage with two scale bars (lon/lat) but how 
would you imagine a scale bar for e.g. north America?

Bernhard

Am 24.06.2014 10:07, schrieb Jorge Tornero - Listas:
> Hi, Ted, Matthias and all,
>
> If you enable CRS transform on-the-fly, meter/feet/NM scales can be
> shown in WGS84 projects.
>
> About what Matthias said in
>
>> Concerning the scale-bar issue. I think, that one should always be
>> allowed to show a scale-bar, but that the units need to match with the
>> one in the projection, so in the case of WGS84, the units should be
>> degrees.
>
> In my opinion, despite this is completely true from a formal point of
> view, sometimes you need scales in 'real world' units just to make
> possible for people to understand your maps. For the most of the people
> I know that see my little work it makes no sense a scale in degrees (in
> fact, they could have it in the grid labels) but a scale in nautical
> miles (or whatever) makes sense inmediatly for them, even if it is not
> accurate. So, providing that the person who is making the map should
> know what he/she is doing, it is nice for the user to have the
> possibility to show the scale in whatever units he wants. Maybe it could
> be corrected just using a projection (I guess that's the proper way),
> but sometimes it leads to "weird" (in the sense of people is used to see
> *their geography* in a determinate way) maps which somehow annoy people.
>
> All the best,
>
> Jorge Tornero
>
>
>
>
> El 24/06/14 08:59, Matthias Kuhn escribió:
>> Hi Ted,
>>
>> I don't get a crash here (Linux/latest prerelease). It would be much
>> appreciated if you could follow Richards advice for testing/reporting.
>>
>> Concerning the scale-bar issue. I think, that one should always be
>> allowed to show a scale-bar, but that the units need to match with the
>> one in the projection, so in the case of WGS84, the units should be
>> degrees.
>>
>> Regards,
>> Matthias
>>
>> On 24.06.2014 08:29, Richard Duivenvoorde wrote:
>>> Hi Ted,
>>>
>>> I'm not on Win, but if possible can you test this with latest release
>>> candidates, see
>>>
>>> http://qgis.org/en/site/getinvolved/development/index.html#location-of-prereleases-nightly-builds
>>>
>>>
>>> and if that one is crashing, please file an issue:
>>>
>>> http://qgis.org/en/site/getinvolved/development/index.html#bugs-features-and-issues
>>>
>>>
>>> Current dev version has a lot of changes under the hood, but also an
>>> awfull lot of fixes!
>>> So please test the latest version and let us know if that crashes also
>>>
>>> Regards,
>>>
>>> Richard Duivenvoorde
>>>
>>>
>>>
>>> On 24-06-14 01:30, Ted wrote:
>>>> forgot,
>>>>
>>>> using Windows OS
>>>>
>>>> Win 7 Professional x64
>>>>
>>>>
>>>> Thanks
>>>>
>>>> Ted
>>>>
>>>>
>>>>
>>>>
>>>> On Tue, Jun 24, 2014 at 7:27 AM, Ted <tiruchirapalli at gmail.com
>>>> <mailto:tiruchirapalli at gmail.com>> wrote:
>>>>
>>>>      Hi Developers
>>>>
>>>>      Encountered a very serious problem, looks like this issue is there
>>>>      in 2.x
>>>>
>>>>      Ways to reproduce;
>>>>
>>>>      1. Add a world boundary shp file in wgs84 (you can use other
>>>> files too)
>>>>      http://thematicmapping.org/downloads/world_borders.php
>>>>
>>>>      2. Open the print composer, add a new map
>>>>
>>>>      3. add scale bar
>>>>
>>>>      4. close the composer, return back
>>>>
>>>>      5 remove the layer from layer list
>>>>
>>>>      6. boom, qgis crash
>>>>
>>>>
>>>>      hope you can fix this soon, thanks
>>>>
>>>>
>>>>      The scale bar issue
>>>>
>>>>      1. When a file is degree (wgs84), the scale-bar in print
>>>> composer is
>>>>      useless since its trying to use the map unit.
>>>>
>>>>      2. Its logical that, in map composer its always linear map unit as
>>>>      in meter, feet, km, etc
>>>>
>>>>      3. using qgis in schools and this pose a serious issue, since the
>>>>      users dont understand projection etc.
>>>>
>>>>      4. the expected behavior is, immaterial of underlying
>>>> projection the
>>>>      scale-bar should have the option to use linear map unit, specially
>>>>      meters, km, mile
>>>>
>>>>      5. read in stackexchange, this is a known issue. hope the dev
>>>>      community can help to fix this one.
>>>>
>>>>
>>>>      thanks a lot.
>>>>
>>>>      hurt my fingers, not able to type proper :(
>>>>
>>>>
>>>>      cheers
>>>>      ted
>>>>


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