[Qgis-user] [Qgis-developer] Projection of ESPG/ESRI

[Randal Hale]

I'll double check the settings because it isn't saying a word with an 
undefined projection. I hate extra menus/windows coming up just for the 
sake of warnings - but having one in this case would be a good thing.

It's probably somewhere in the settings - or at least I hope it is. 
Lemme look.....aaaaannnnnnddddd you are correct sir.

Under Settings -> Options -> CRS you can choose default behavior for 
undefined data.

Well - I've learned something new. I owe you an adult beverage of your 
choice.

Randy

-----------------
Randal Hale, GISP
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 rjhale at northrivergeographic.com
<mailto:rjhale at northrivergeographic.com>
twitter:rjhale
http://about.me/rjhale

On 11/27/2013 02:48 PM, Alex Mandel wrote:
> Right, that's because they have on the fly projection turned ON by
> default. I thought at some point QGIS added a warning if it can't read
> the existing proj, maybe you have to toggle it in your settings.
>
> If we don't have that we probably should add it.
>
> Like you though, I follow a general rule: Before doing any analysis
> always convert everything to the same projection.
>
> Projection on the fly is for data exploration and occasionally
> cartography (though it can slow cartographic rendering and sometimes has
> rendering errors when compared to reprojected data).
>
> Enjoy,
> Alex
>
> On 11/27/2013 11:36 AM, Randal Hale wrote:
>> Yeah - that's how I do it in ESRI but it tends to scream more with a
>> undefined projection. QGIS just accepted it and moved onward - Luckily I
>> haven't had any undefined things show up until I started deleting prj
>> files trying to figure out what was going on with the EPSG:102667
>> incident last night.
>>
>> I appreciate the help.
>>
>> randy
>>
>>
>> -----------------
>> Randal Hale, GISP
>> North River Geographic Systems, Inc
>> http://www.northrivergeographic.com
>> 423.653.3611 rjhale at northrivergeographic.com
>> <mailto:rjhale at northrivergeographic.com>
>> twitter:rjhale
>> http://about.me/rjhale
>>
>> On 11/27/2013 02:31 PM, Alex Mandel wrote:
>>> On 11/27/2013 11:18 AM, Randal Hale wrote:
>>>> Awesome - OK - I didn't know project on the fly would assign a
>>>> projection. I usually leave it off - All the data needs to be in one
>>>> projection anyway.
>>>>
>>> No it's not that it assigns a projection, it's that it ignores the
>>> projection and just operates on pure coordinates. So if you bring 2
>>> things in that are different projections (ie a UTM layer and an unknown)
>>> then unless they are actually the same projection they won't line up at
>>> all.
>>>
>>> If you were to turn projection on the fly on, then the auto guess
>>> incorrect WGS84 would do way screwy stuff even if both layers were the
>>> same projection.
>>>
>>>
>>> So basically, load up your unknown layer. Then load a known reference
>>> layer. If it matches you have a winner, if it doesn't drop it and try a
>>> different reference layer (different projection), and so on till you
>>> find the match.
>>>
>>> Enjoy,
>>> Alex
>> _______________________________________________
>> Qgis-user mailing list
>> Qgis-user at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/qgis-user