Over the last days i added a number of images to the OSM images for mapping produced from Sentinel-2 and Landsat data.
There are three new images for the Antarctic:
McMurdo Bay area
This image covers the McMurdo Sound, McMurdo Dry Valleys and Ross island. Data is from February 2017 – end of summer, but with quite a bit of seasonal sea ice cover still present.
There is a lot that can be mapped from this image in terms of topography, glaciers and other things. It can also be used to properly locate features where you only have an approximate position from other data sources. If you compare the image with existing data in OSM you will also see that there is significant mismatch in many cases. Positional accuracy of the image – like the other Antarctic images – is good but not great. In mountainous areas at the edge of the image swath (here: in the northwest) errors can be more than 50m probably on occasion but otherwise will usually be less.
Another part of the East Antarctic coast. This requires a bit of experience to distinguish between permanent and non-permanent ice. But existing mapping in the area is poor so there is a lot of room for improvement.
Larsen C ice shelf edge
This is an image for updating the ice shelf edge after the iceberg calving in 2017. The current mapping in OSM here is very crude since based on low resolution images.
Western Alps autumn colors
And then there is another image which is more of an experiment. This is an autumn image from the western Alps that shows autumn colors and could be helpful for leaf_cycle mapping. I am not quite sure how well this works. You probably need some level of local knowledge to be able to interpret the colors correctly. The red-brown colored forested areas are usually deciduous broadleaved forest, in many cases beeches. Larches are more yellow in color and are often mixed with other types of trees which makes them more difficult to identify. Also the different types of trees change their colors at different times – also depending on the altitude – so a single image does not really cover everything and a solid local knowledge is probably important not to misinterpret the colors.
I would be interested in feedback about to what extent this image is useful for mapping leaf_cycle.