Most areas need a comparably big alignment of the image.
Right now we miss reference points on the ground that have a precise known position and are clearly visible on the aerial images.
For the Chiang Mai areas search for “Wat Doi Saket” and align the buildings with the aerials. Johnny Carlsen and I both independently aligned the aerials according to existing GPS tracks and got a matching building outline.
If you align try to use GPS tracks as reference on an area with open sky, so not downtown city. Try to align against multiple tracks from different users to average out errors.
Adjust using Potlatch2 (hold space and align) or JOSM Imagery plugin (adjustment icon in sidebar)
Great, I didn’t expect this in the near future. Most of Khon Kaen Province up to zoom level 18. Same as Google, but newer, 2008 or even 2009. The shift differs already within the city. But many highways are already in OSM based on GPS traces for adjusting the images. Time to start rethinking about my mapping methods and projects.
I can’t get Bing to work at all at the moment.
First time I’ve tried, but all I get is a white background.
Is there any set-up I need to do?
I kinda thought it should just “work” according to the wiki entry on it.
Thanks for any help.
Should have been more specific, Bing in JOSM…
Found my problem.
Both the max and min zoom were set to 2 in the wms plugin preferences…
I had to download and debug the source to work that one out, it’s not something I’ve ever changed, god knows why it was set like that.
Important thing is it’s ok now.
do not worry so much about that misalignment. Looks like less than 10 meters to the West and 5 meters to the North.
True, it is disturbing when tracing. But on your GPS you will hardly ever see it: at common resolution, the lines used for showing the roads are bigger than that!
Consequently, let us continue tracing their images, as most areas of Thailand are still hardly mapped at all. Meanwhile I have traced most roads between Ranong and Krabi along the Andaman coast, try it on your GPS, and tell me how much you were disturbed by the Bing offset…
Have a lot of fun!
The misalignment varies. Some times you can see the result of the aerial image stitching and rectification process. Just try to be as accurate as possible. This saves a lot of time later.
Even when you don’t see the accuracy on your unit, the mapmatching engine inside will give a lot better results when the underlying data is more accurate.
Looking at this area: There are hardly names or highway numbers. The highway classification is based on what. A lot of data, few information. I’m wondering for which purpose somebody might use such a map. The blank satellite images contain more information.
Imho, more information, not more data is needed. I worry about that much more.