Closest observation method
\[\hat{Z}(s_0) = Z(s_{closest})\]
## class : SpatVector
## geometry : polygons
## dimensions : 575, 7 (geometries, attributes)
## extent : 472365.2, 481469.4, 4199888, 4209186 (xmin, xmax, ymin, ymax)
## coord. ref. : GGRS87 / Greek Grid (EPSG:2100)
## names : id size price prpsqm age dist_metro vble
## type : <chr> <int> <int> <num> <num> <num> <num>
## values : 1935 62 79000 1274 8 586.2 1274
## 1460 92 115000 1250 13 692.1 1250
## 1509 82 200000 2439 12 593.3 2439