The data available gives the location of Tree Preservation Orders issued within the Sedgemoor District area only.
The co-ordinates are for British National Grid [epsg:27700]
The data was extracted 27th July 2017.
What does each column mean?
For the main file(tpo.csv) contains TPO spatial data:
Id - Unique identifier for record in GIS layer (generated from RowId)
REFERENCE - Identifier for TPO record.
Obj_type - Type of spatial object. In the layer there are currently 300 Region objects and 1768 Point objects.
Obj_centroid_X - Easting for the centre of the object. (Please note, for a Region object this may fall outside of the actual spatial object)
Obj_centroid_Y - Northing for the centre of the object. (Please note, for a Region object this may fall outside of the actual spatial object)
Obj_npolygons - A Region object may be comprised of more than one polygon. (This is the number of polygons for the particular TPO record. If it is a Point object, the value will be 0)
Polygon1_nodes - The number of nodes that comprise the first polygon.
Polygon2_nodes - The number of nodes that comprise the second polygon. This is 0, if there is only one polygon.
The second file (tpo_polygon_nodes.csv) contains TPO spatial data (This only relates to TPO records in the main file which have Region objects. The file lists all the co-ordinates for all the nodes within a polygon. The co-ordinates for the first and last node will be the same):
Id - Link to record in tpo.csv extract
Polygon - The polygon identifier for a Region object. One TPO record has two polygons