Imagine going on a trip somewhere for the first time and, while on this trip, you encounter some fascinating and interesting things. So like most people, you pull out your phone and start taking photos of all the stuff that interest you (e.g. famous landmarks, buildings, etc.). You return from your trip with a bunch of fond memories, a bucket of experiences, and a phone full of photographs. You then choose the best photographs and think of what to do with them – you can upload them on social media, you can send them to friends, or you can make a map. Thankfully, you had your phone’s geolocation on while taking the photographs so you don’t just have photographs but geotagged photographs.
A geotagged photograph is a photograph with an associated geographic location added to it by a process called geotagging. The geographic information (latitude, longitude, and optionally altitude, bearing, and others) are stored in the image’s EXIF header. Most modern smartphones have the option of geotagging the photos they take. Geotagged photographs are geospatial data that you can play around with in something like QGIS.
Prior to QGIS 3.4, importing geotagged photos in QGIS was done via a plugin. If you’re still using QGIS version lower than 3.4 (but why?), you can use the ImportPhotos plugin to import geotagged photos in QGIS.
With QGIS 3.4 onwards, importing geotagged photos is now a core processing algorithm which can be found in the Processing Toolbox under Vector creation → Import geotagged photos.
The processing algorithm scans a given directory/folder for images and imports the geotagged images to QGIS as a point layer.
- Input folder - the location of the images/photographs
- Photos - the name of the file to be created/loaded in QGIS
- Invalid photos table - a table of unreadable or non-geotagged photos
After successfully running the algorithm, a point layer will be added in QGIS.
Let’s add a basemap to add some flavor to the map.
The attribute table of the point layer will contain the file location of the photo as well as the corresponing geographic information.
Congratulations on importing your geotagged photos in QGIS but what now? It’s a bit boring if the photos just appear as points on the map. What else can we do with our geotagged photos?
IMPORTANT: The next steps on Viewing and Displaying the geotagged photos depend on QGIS knowing the file location of the photographs (i.e. the photo, filename, and directory fields of the point layer). If you move the location of the photographs, change their name, or change the name of the folder/directory of the photographs, you also need to edit the values of the fields to correspond to these changes.
If you simply want to see what photos are on what points, you can use the eVis Event Browser. eVis is a core plugin in QGIS that you can activate under the Manage and Install Plugins dialog.
The eVis Event Browser can be found in Database → eVis → eVis Event Browser. Run eVis Event Broswer while the point vector is selected in the Layer Panel.
This will open the Event Browser window that you can use to view the photos.
The Event Browser shows the information (including the photo) correponding to the point highlighted in the Map Canvas.
Map Tips are awesome. It allows you to define what to display when hovering over a feature – sort of like pop-ups in web-maps (scratch that, exactly like pop-ups in web-maps).
To define the map tips to be shown, we first activate the Map Tips button found in the Attribute toolbar.
Afterwards, go to the Display tab of the layer’s Properties (right click on layer → Properties → Display). Here, we can define what’s to be displayed when hovering over the points. Map Tips accept HTML code so we can use HTML tags in creating our map tips. If we just want to show an image, we can use:
- file:// informs your machine that your image is a local file located at [% “photo” %]
- [% “photo” %] is the value of the photo field in the attribute table
- height and width define the dimensions of the photo in the map tip
After clicking OK, you should now be able to see the photos when hovering over the points.
That’s all fine and good but what if I want to show the images on the map and not need to hover over them? Well, you’re in luck because QGIS gotchu fam.
QGIS 3.6 came with a new symbology for points know as Raster image marker. Basically, you can now use rasters (read: images) as markers for your points which is perfect when we want to display geotagged photos in QGIS.
To use Raster image markers:
- Choose Single Symbol
- Change Symbol label type from Simple marker to Raster image marker
- Use a Data-defined override for the file location
- Field type: string → photo (string)
After clicking Apply, the photos should now appear as markers on the map.
You can now use this to create a printable/shareable map in the Print Layout. Enjoy! :)
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