rasterandmestiku aegrida; tüüpiliselt rakslite 3D (x,y,t) andmekogum, mille elemendiks on tiksel, andmekogum, miille elementidel on nii aega kui ka ruumi kajastavad atribuudid, a mapping technique introduced in 1970 by Swedish geographer Torsten Hägerstrand to study the social interaction and movement of individuals in space and time. This technique adds time as a z-axis to the familiar x, y map coordinates used by mapmakers