Hi Ert:
You can save locational data in jpg and pdf files from within the Print
Composer window. Under composition tab on the right hand side of the
window, scroll down and check the Save World File checkbox. Export your
map/composition as a jpg or pdf and the geolocation data will be written
to a world file for a jpg and internally for a pdf.
Good luck
Kirk Schmidt
On 6/2/2019 4:26 AM, Ert Four wrote:
Thank you Alex and Roxo for your replies.
From what I can tell the SVG and JPG files probably don't have location info
in them, but it's also hard to tell what exactly the data is in some places,
especially in the SVG.
It looks like qgsmaprenderertask.cpp was written two years ago, which was after
2.14 came out.
I will post on the developer list per Alex's suggestion. All of this is trying
to prove that something doesn't exist -- which is always hard.
Thanks again.
On June 1, 2019 at 4:41 PM "Fernando M. Roxo da Motta" <pe...@roxo.org> wrote:
On Thu, 30 May 2019 17:09:59 +0200 (CEST), Ert Four <4...@mailbox.org>
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.
AFAIK, if you save in PNG or JPEG format no coordinate information is
stored in metadata of the image:
$ exiftool Inhambu.jpg
ExifTool Version Number : 10.80
File Name : Inhambu.jpg
Directory : .
File Size : 49 kB
File Modification Date/Time : 2019:06:01 11:37:04-03:00
File Access Date/Time : 2019:06:01 11:37:04-03:00
File Inode Change Date/Time : 2019:06:01 11:37:24-03:00
File Permissions : rw-r--r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
JFIF Version : 1.01
Resolution Unit : inches
X Resolution : 96
Y Resolution : 96
Image Width : 917
Image Height : 665
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2)
Image Size : 917x665
Megapixels : 0.610
$ exiftool Inhambu.png
ExifTool Version Number : 10.80
File Name : Inhambu.png
Directory : .
File Size : 47 kB
File Modification Date/Time : 2019:06:01 11:37:04-03:00
File Access Date/Time : 2019:06:01 11:37:04-03:00
File Inode Change Date/Time : 2019:06:01 11:37:44-03:00
File Permissions : rw-r--r--
File Type : PNG
File Type Extension : png
MIME Type : image/png
Image Width : 954
Image Height : 652
Bit Depth : 8
Color Type : RGB with Alpha
Compression : Deflate/Inflate
Filter : Adaptive
Interlace : Noninterlaced
Significant Bits : 8 8 8 8
Pixels Per Unit X : 3780
Pixels Per Unit Y : 3780
Pixel Units : meters
Image Size : 954x652
Megapixels : 0.622
If you save as geotiff the positioning information should be written
in metadata. I don't know about the PDF format. In any case, all
informations, except the CRS, will be written to the world file.
HTH
Thank you, first time posting, very much appreciate QGIS and its
community!
Roxo
--
---------------- Non luctari, ludare -------------------+ WYSIWYG
Fernando M. Roxo da Motta <pe...@roxo.org> | Editor?
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------------ Quis custodiet ipsos custodes?-------------+ I get text!
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