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Use OpenStreetMap as a source for the land-sea-mask#31

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LucasChollet wants to merge 1 commit intoVBoulenger:masterfrom
LucasChollet:osm_data
Draft

Use OpenStreetMap as a source for the land-sea-mask#31
LucasChollet wants to merge 1 commit intoVBoulenger:masterfrom
LucasChollet:osm_data

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@LucasChollet
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This is an alternative solution to the issue #29 tries to solve, only one of both solution should be merged.

It is a draft for now, as we should retrieve the source file automatically and not hardcode the path.

The mask comes from OpenStreetMap is much more accurate than SRTM. But, when using another source, the Land-Sea-Mask operator does not consider shorelineExtension. Which mean that we are stuck with any issue that the new mask has.

On the same tile as #29, the number of detection drops to 490 (330 fewer detections):
osm

The mask:
mask

This mask is much more accurate than SRTM. But, when using another
source the Land-Sea-Mask operator does not consider shorelineExtension.
Which mean that we are stuck with any issue that the new mask has.
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