[Qgis-user] Is location info included in metadata when save an image file?

[Alex M]

The QGIS Developer list might be the better place to get confirmation.

For the Save as Image I think this is the code, starting around line 106
https://github.com/qgis/QGIS/blob/736e8cbbc34ef8ea4ec935851766dd295a365b1a/src/core/qgsmaprenderertask.cpp#L106

Which appears to render an image, and save. If it was geographic it
would use the ogr based data writing method.

I did not go looking for the SVG export which is Qt based.

Enjoy,
Alex

On 5/31/19 06:32, Ert Four wrote:
> Thank you, I didn't know SVG was XML/text based, I will check that out.
> 
> Sometimes I will need to export a PNG or JPG. Sorry, I need to be really careful, have you or has anyone reading this read the relevant parts of the code, by chance?
> 
> For now I'm taking screenshots to be sure nothing is transmitted, but that has limitations.
> 
> Thanks.
> 
> 
>> On May 30, 2019 at 5:47 PM Alex M <tech_dev at wildintellect.com> wrote:
>>
>>
>> On 5/30/19 08:09, Ert Four wrote:
>>> Does any coordinate or location data get embedded in the image file if I use Project > Save as Image or Composer > Export as Image/PDF/SVG?
>>>
>>> I'm using QGIS version 2.14.3 Essen, although I would like to know about more recent versions, too, for when I upgrade later.
>>>
>>> (I'm aware of the option to check "World file on" and create a separate world file. What I need is to make sure there is no identifying info whatsoever from the project file in the image file itself.)
>>>
>>> Eg, say I have a basemap like OpenStreetMap open for a country and I load points in another layer that are inside that country. Then I zoom in on a group of points from my data layer, I turn off the basemap layer, and make a map with just my data points. I want to preserve the relative spatial relationships between my points but not reveal where in the world the map came from. If I publish this image file, might the metadata reveal the location?
>>>
>>> For the work we do, it's critically important we not unknowingly publish specific locations.
>>>
>>> Thank you, first time posting, very much appreciate QGIS and its community!
>>>
>>>
>>
>> Save Image should be safe for this use if you do not include the world
>> file with a png or jpg.
>>
>> I believe this is also true for Composer exports to the formats you
>> mention, but could easily be checked by exporting and SVG and then
>> viewing the SVG (XML) in a text editor.
>>
>> Thanks,
>> Alex
>>
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