On Sep 24, 2020, at 2:53 PM, Joseph Eisenberg <joseph.eisenb...@gmail.com> wrote: > Most large wildfires do not burn the canopy (the tallest trees) in forests > with trees over 10 meters in height.
Noted, thank you. > The perimeter of the wildfire, shown commonly on public maps, does not > determine which areas have been burned. Often there are large areas of > vegetation along canyon bottoms and streambeds which are unburned, within the > perimeter. Something I already DID know, also noted, thank you. > You will need new aerial imagery or detailed on-the-ground survey to > determine the surviving areas of vegetation. Something I have anticipated (apparently correctly), yet which isn't available now (though I assume will be, in the regular course of imagery being updated), so also noted, thank you. > I would not recommend attempting to map the current official perimeter of the > fire, since this changes on a daily or hourly basis: it is a temporary event > which is not really verifiable from the standpoint of an OpenStreetMap > volunteer mapper. It isn't anticipated, it was completed about a month ago, containing only two versions, creation with start_date and one a couple days ago to add the end_date tag. It is a lightweight data structure: one polygon with three tags. I don't intend to delete it, as it marks a distinct boundary in the real world regarding real world components (like landuse and land cover) that OSM already maps — indeed which OSM already 100% maps in the area noted —yet these (existing landuse and land cover) polygons may have their nature / character quite substantially altered from the fire. The event WAS temporary (and determinable from start_date and end_date keys), the aftermath will indisputably last years, perhaps decades. OSM will be mapping in the area during the meantime. > Database users who need these perimeters should download the latest version > from the official sources. Yes, AND OSM users who map in areas affected by the fire want (likely need) fire perimeter data to delineate where substantial "re-mapping" almost certainly must take place. Thank you for your quick reply! SteveA _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
