Tree Inventory is a dataset containing approximately 149,000 trees owned by the City of Ottawa
This dataset is available on the City of Ottawa's open data portal, as part of a government initiative for open data.
The availability of this data on OSM could benefit users in searching for or creating a map of trees within the city. For example, fruit-bearing trees that can be harvested for consumption.
From the dataset source page "This data was collected in the field using GPS software on handheld computers"
The data being used is a .osm file that has been modified from provided source data. The one that is being used is the KMZ format as is was already in WGS84 projection.
The KMZ format had tags that are not usable in an OSM format and thus had to be cleaned and modified with proper OSM tags.
Entries without OSM tags were removed from the source data.
Entries with only OSM tags were manually added based on research (meaning a quick Wikipedia search)
|Original Key||OSM Tag||Example||Description|
|source||City of Ottawa|
|SPECIES||species:en||Ash Green||What species is the tree|
|DBH||dbh||9||The diameter of the tree (Diameter at breast height)|
|ADDNUM||40||Civic number associated with the trees location|
|ADDSTR||ROYAL FIELD CRES||Street name associated with the trees location|
|RDLOCATION||Boulevard||Is the tree located in a Median, Boulevard etc|
|LTLOCATION||Rear||Is the tree located on the side/front of the parcel|
|DEDTAGNUMB||0||Tag number associated with Elm trees involved in the DED injection program|
|EABTAGNUMB||0||Tag number associated with Ash trees involved in the EAB injection program|
|WARD||3||What ward is the tree located in|
The process will be dealt with using the osm-ca Tasking Manager to ease the work flow as there is a lot of data to be added.
The time frame can expect to be only a couple days at most after getting approval from the community.
Use of new tag
The biggest issue I can see with this data is the use of the DBH tag. The suggested OSM tag to use is circumference, however DBH is a much more common measurement in botany.
Current Trees in OSM
There are about 6,021 trees in OSM within the area of the dataset. Of those, only 3 have anything more that
natural=tree and neither of them overlap with what is being imported. If any of the remaining 6,018 trees are overlapping with the data set, simply using the
m key to merge the existing node to the new one will fix this and retain history of said node.