Table 4 Wetlands in object-lifelines (Wetlands.shp).

From: Spatiotemporal historical datasets at micro-level for geocoded individuals in five Swedish parishes, 1813–1914

Attributes Type Description
FID Integer Shapefile automatic identifier.
Shape Geometry Geometry of the object (polygon).
wetlandId String Unique identifier of the wetland. The same identifier is assigned to those overlapping historical and modern wetland polygons that represent the same wetland (but with different geometric shapes because of, e.g., drainage). Created by the authors.
sDateMin Integer The earliest start date (usually only the year), which represents an uncertainty interval of the object’s lifeline. That is, the object may exist as early as indicated in this attribute.
sDate Integer Specific start date (usually only the year). Almost always used when a joint drainage unit explicitly determines the start date of a modern wetland. E.g., a wetland was partially drained in 1889, and an overlapping, smaller, wetland can be observed in the modern data, this wetland is assigned the start date of 1890.That is, we assume that at this point in time, the modern wetland got its present geometric shape.
The value ‘9999’ indicates that the wetland start within the interval that is defined by the sDateMin and sDateMax.
sDateAvg Integer An approximate start date for the wetlands observed in the modern data (usually only the year). Calculated as sDateMin+(eDateMin−sDateMin)/2. E.g., if a wetland observed in the modern data can earliest start in 1821, and earliest end at 2007 (the year it was digitized), its sDateAvg=1914.
sDateMax Integer The latest possible start date. Most often the year when the wetland was observed in the map.
eDateMin Integer The earliest possible end date (usually only the year), which represents an uncertainty interval of the object’s lifeline. That is, the object exists to at least the date indicated in this attribute. This date correspond often to the observation in the map. E.g., if a wetland was digitized from the MTSM map in 1820, eDateMin is set to 1820.
eDate Integer A specific date which most often indicate the year when a joint drainage was carried out on the wetland (usually only the year). The value ‘9999’ means that no joint drainage has been observed and that the wetland therefore stops to exist within the interval eDateMin and eDateMax.
eDateAvg Integer Used mostly for the historical wetlands observed in the 1820 MTSM map (usually only the year). Calculated as: sDateMax+(eDateMin−sDateMax)/2. If eDate is a specific date, eDateAvg is assigned the value of eDate.
eDateMax Integer The latest possible end date (usually only the year). The value ‘9999’ is used for the wetlands observed in the modern data and means ‘and onwards’ (i.e., it still exist and we do not know when it will stop existing).
obsDate Integer Date of observation (=date of the map from which the wetland was digitized) (usually only the year).
Source String The source of the wetland object.
wLandType String Type of wetland (only for wetlands observed in the modern data). Marshy or Very marshy.
Note String Note about the wetland object. This information is mainly relevant if the lifeline estimation were to be improved.
drainName String Name of the joint drainage related to the wetland.