Pablo Sastre Olmos HerpNet/GBIF Georeferencing Workshop 2006 Georepresenting.

Pablo Sastre Olmos

HerpNet/GBIF Georeferencing Workshop 2006

Georepresenting

Spain / Europe

GIS Layer “Country-polygon”: Num. / Cont-Ocea / Country Europe / Spain Collection Database: Num. / Sps / … / Cont-Ocea / Country

Canary Islands / Spain / Africa

GIS Layer “Archipielago-circle”: Num. / Archipielago Africa / Spain / Canary Islands

Collection Database: Num. / Sps / … / Cont-Ocea / Country / Archipielago

Madrid / SpainExtent

GIS Layer “Provinces-Spain-polygon”: Num. / State-Province Spain / MadridCollection Database: Num. / Sps / … / Country / State-Province

Madrid / SpainUncertainity

GIS Layer “Provinces-Spain-polygon”: Num. / State-Province (=Madrid)

GIS Functions / Distance operators / Buffer

Triturus pygmaeus Patella ferruginea

Muros / A Coruña / Galicia Tres Cantos / Madrid

Named places - County

A Coruña / GIS Layer “Counties-Spain-polygon”: Num. / County Madrid / Muros Tres Cantos

Collection Database: Num. / Sps / … / State-Province / County

Birds Colection – Spanish Museum of Natural Sciences (MNCN-CSIC)

Genus ParusForest

Genus CircusAgriculture

Madrid /Counties

Tres Cantos / Madrid

Circles or Squares ?

GIS Layer “Counties-Spain-UTMx10”: Num. / UTMx10 / County Madrid / Tres Cantos Collection Database: Num. / Sps / … / State-Province / County

... or Points ?

Centroid (averagepolygon coordinates)

Geometric centre(coordinates of the furthestpoint from polygon border)

Urban centre(coordinates of themain city centre)

GIS Layer “Counties-Spain-GeometricPoint”: Num. / … / State-Province / County

Collection Database: A Coruña / MurosNum. / Sps / … / State-Province / County

Muros / A Coruña /

Galicia / Spain

Closer to Louro

Named places - Specific locality Louro / Muros / A Coruña / Galicia / Spain

A Coruña / Muros /Louro

Muros county

Localities nearby

Thiessenpolygons(Voronoi)

Collection Database: Num. / Sps / ... / Cont-Ocea / ... / Locality

GIS Layer “DetailedLocalities”: Num. / Locality

Generalization

5 Km (±0.5) from Muros

Offsets5 Km North from Muros (Muros / A Coruña / Galicia / Spain)

5 Km Northfrom Muros

Aspect

Muroscounty

North from Muros

Distance

Generalization

Collection Database: Num. / Sps / ... / Cont-Ocea / ... / Offset

GIS Layer “Offsets”: Num. / Offset