Right Phil, thanks for this remark.
Tides are rather short-term and more predictable water table variations.
As such, seldom marked with physical signs. In Poland we found 0 within
262.
High water mark (boundary) is probably more legal term - demarcation of
water/land mainly in coastal zones. It can be found in US, GB, AU and
probably many other countries [1][2].
Big problem is very wide (misleading) meaning of "high water mark" [3].
regards,
Robert
[1]
http://www.valuergeneral.nsw.gov.au/__data/assets/pdf_file/0008/216980/Valuation_of_land_below_high_water_mark_commercial_waterfront_occupancies_July_2017.pdf
[2] http://cromersurveyors.com.au/blog/high-water-mark-title
[3] http://www.mikelynaugh.com/MalvernHill/images/IMG_2341.jpg
W dniu 25.07.2018 o 14:21, Philip Barnes pisze:
High water is commonly used in terms of tides.
Phil (trigpoint)
On 25 July 2018 13:05:56 BST, Robert Szczepanek <rob...@szczepanek.pl>
wrote:
Hi all,
We work on flood marks project [13] and your opinion on proper tagging
is crucial for us, as database of existing features is based on OSM
records. We have identified probably most of existing marks in Poland,
but would like to finally unify tagging within OSM project.
Both terms (flood mark and high water mark) can be treated as synonyms
[1][2].
High water mark is more popular in USA [3][4], while flood mark in
Europe [5][6]. But this is not a rule [7].
Why "flood mark" term is better in our opinion?
1. "Flood" term is shorter and easier to understand worldwide compared
to "high water".
2. Flood mark is more popular in scientific publications [8, 9, 10].
References are from "Hydrology and Earth System Sciences", one of the
best hydrological journals [11].
3. "High-water mark" term is used also in economy and has another
meaning [12].
4. All additional keys usually contain "flood", not "high water" term.
Like "flood_date". It will be more consistent.
In OSM database there are now:
- 262 features with flood_mark=yes [14]
- 80 features with historic=highwater_mark [16]
- 20 features with high_water_mark=yes [15]
Question 1:
a/ flood_mark
b/ high_water_mark
c/ highwater_mark
Question 2:
Which tagging convention should we follow:
a/ flood_mark=yes + historic=memorial + memorial:type=flood_mark
b/ historic=flood_mark + flood_mark:type=(plaque, painted, ...)
c/ historic=highwater_mark
Not every flood mark is a memorial, so probably 2.a/ is not the optimal
option. Short discussion about this can be found here [17].
Thank you for help,
Robert
References
[1]http://floodlist.com/dealing-with-floods/flood-high-water-marks
[2]
https://theconversation.com/historical-record-shows-these-floods-are-no-high-water-mark-23266
[3]https://www.weather.gov/gld/1935flood-hwmarks
[4]https://www.fema.gov/high-water-mark-initiative
[5]
https://www.ceh.ac.uk/news-and-media/news/ceh-experts-contribute-environment-agency-report-feh-local-flood-frequency-estimation
[6]
http://www.studia.photos/england/oxford-oxfordshire-england-uk/attachment/flood-marks-osney-lock-river-thames-oxford-oxfordshire-england-uk/
[7]
https://www.alamy.com/stock-photo-flood-level-hight-marks-on-st-margarets-church-porch-kings-lynn-norfolk-11448961.html
[8]https://www.hydrol-earth-syst-sci.net/19/3517/2015/hess-19-3517-2015.pdf
[9]
https://www.hydrol-earth-syst-sci-discuss.net/12/6541/2015/hessd-12-6541-2015.pdf
[10]
https://www.hydrol-earth-syst-sci.net/18/4029/2014/hess-18-4029-2014.pdf
[11]https://www.scimagojr.com/journalsearch.php?q=hydrology
[12]https://www.investopedia.com/terms/h/highwatermark.asp
[13]http://openhydrology.org/maps/flood_mark/
[14]https://wiki.openstreetmap.org/wiki/Key:flood_mark
[15]https://wiki.openstreetmap.org/wiki/Key:high_water_mark
[16]https://wiki.openstreetmap.org/wiki/Tag:historic%3Dhighwater_mark
[17]https://wiki.openstreetmap.org/wiki/Talk:Tag:historic%3Dhighwater_mark
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