Changeset: 58492444
Tweaks to 100 Islands coastlines
Closed by Paverne
Tags
changesets_count | 1041 |
---|---|
created_by | iD 2.8.1 |
host | https://www.openstreetmap.org/edit |
imagery_used | Bing aerial imagery;OpenStreetMap GPS traces;DigitalGlobe Standard Imagery |
locale | en-AU |
source | aerial imagery;gps |
Discussion
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Comment from GOwin
Please note that there are various variances with imagery alignments, depending on the provider and even between provider's own imagery releases. Please cross reference with SatNav tracks
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Comment from Paverne
Yes I notice there are considerable differences between satellite images, in a number of respects - time and geometric linearity - even in non-coastal areas geometries vary between image sources (not just the time-based man-made variability). It's a bit of a guessing game - generally I've tended to use Bing for geometry and Digitalglobe for the most current man-made features. For the 100 Islands I've been trying to update the coastline to add more detail as some of the islands were very chunky. The main motivation was for appearance rather than for precision, though I've been trying to get them as good as I can given the image variances. As 100 Islands is the major tourist attraction for the municipality I wanted to get them to look better! I was hoping the GPS traces - both existing ones and the ones I gathered in March would help resolve image offsets, they may have contributed, but not with sufficient accuracy to be 100% certain on Island location and hence offsets. This is a best effort. For this particular island there are no GPS traces. Cheers
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Comment from GOwin
Your effort is appreciated. Thank you, @paverne.
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