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| Areal Interpolation× | Dasymetric Mapping× | |
|---|---|---|
| Ämnesområde | Human Geography | Human Geography |
| Familj | Process / pipeline | Process / pipeline |
| Ursprungsår≠ | 1979 | 2003 |
| Upphovsperson≠ | Waldo Tobler (pycnophylactic) and Michael Goodchild & Nina Lam (areal weighting) | J. K. Wright (introduced 1936); modern surface method by Jeremy Mennis |
| Typ≠ | Method for transferring attribute data between incompatible sets of areal units | Cartographic areal-interpolation technique using ancillary data |
| Ursprungskälla≠ | Tobler, W. R. (1979). Smooth pycnophylactic interpolation for geographical regions. Journal of the American Statistical Association, 74(367), 519–530. DOI ↗ | Mennis, J. (2003). Generating surface models of population using dasymetric mapping. The Professional Geographer, 55(1), 31–42. DOI ↗ |
| Alias≠ | Cross-Areal Estimation, Zone-to-Zone Interpolation, Spatial Data Transfer | Dasymetric Map, Dasymetric Interpolation, Ancillary-Based Areal Interpolation, Population Surface Mapping |
| Närliggande | 4 | 4 |
| Sammanfattning≠ | Areal interpolation is the family of methods for transferring attribute data — populations, counts, rates — from one set of areal units (the source zones) onto a different, incompatible set (the target zones). The need arises constantly in geography because census tracts, postal zones, electoral districts, and grid cells rarely align, yet analysts must combine data reported on mismatched geographies. The methods range from simple area-proportional weighting through ancillary-informed dasymetric refinement to Waldo Tobler's 1979 volume-preserving pycnophylactic smoothing, each trading simplicity for accuracy. | Dasymetric mapping is a cartographic and areal-interpolation technique that redistributes data reported for arbitrary administrative zones — such as census counts — onto more meaningful boundaries derived from ancillary information about where the phenomenon actually occurs. Instead of pretending population is spread evenly across a census tract, it uses land cover or land use to push people into the residential parts and out of lakes, parks, and industry, producing a far more realistic population surface while preserving each zone's reported total. |
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