Spiders in Biodiversity Map Database

Accuracy of source data in the database (records)

• text only: mainly legacy data, described generally; not displayed on maps, sometimes imanently imprecise
• area - polygon): many of older data, described at a level of an administration unit; also grid coordinates (mostly UTM squares 10×10 km)
• point - majority of records; a default form of contemporary data, often recorded directly by GPS receivers; for older data point coordinates are acquired from maps

Data presentation

• form
  • ⚬static maps, used in the text application baza.biomap.pl, p. example
  • ⚬dynamic maps, used in the interactive mapping application gis.biomap.pl
  • ⚬text: original data of a record, area names; the only presentation form for imprecise data
• map detail level
  • ⚬point: for point data
  • ⚬area: for data described as such; for points and smaller areas as a generalization method (eg. provinces for data from districts or nature reserves, UTM squares for points); a default form of vizualization for sensitive data (protected, threatened species etc.)