Drone photos from Klix.ba

michalfabik 于 2017年四月 1日以 English 发布

Some time ago, I noticed that the Bosnian news portal Klix.ba sometimes use drone photos to accompany their news articles. I contacted the company and the author, their staff photographer Edin Hadžihasić, and they have kindly given their permission (in Serbo-Croatian) to use the pictures for tracing.

I aligned the photos with existing map data using Map Warper:

My workflow was as follows:
- pick control points recognizable in both Bing imagery and the drone pictures
- map the control points in OSM as accurately as possible (or adjust position of existing OSM objects)
- align the drone photo with the updated OSM map using Map Warper

Sure you can see how inefficient and error-prone this method is but I couldn’t find a way of aligning the drone photos with Bing directly, say by zooming and rotating a semi-opaque copy of the drone photo to fit with the corresponding part of Bing imagery. Any ideas?

Another problem is that there’s a lot of distortion in places with sloping terrain - this can be best seen in the picture with Žuta Tabija.

The results aren’t the most accurate thing in the world but as of now, there is no accurate imagery offset info available for the areas in question anyway, so I guess I didn’t break stuff more than it already was. After tracing the photos in JOSM, the results are quite pretty, I dare say:

Before:
Before

After:
After

There’s still stuff to be done of course. I plan on mapping driving lanes but I want to fix a couple of major intersections first and I need to do some on-site survey for that.

位置： Socijalno, Željeznička, Novo Sarajevo Municipality, City of Sarajevo, Sarajevo Canton, Federation of Bosnia and Herzegovina, 71000, Bosnia and Herzegovina