Keep your face always toward the sunshine - and shadows will fall behind you. Walt Whitman
Idea Transcript
Dasymetric mapping using high resolution address point datasets address point datasets Paul A. Zandbergen Paul A. Zandbergen Department of Geography University of New Mexico
Outline • • • • •
Mismatched spatial boundaries Mismatched spatial boundaries Dasymetric mapping Ancillary data sources ill d Performance of address points Future directions
Mismatched Sets of Boundaries Mismatched Sets of Boundaries
Dasymetric Mapping Dasymetric Mapping Units
Land cover
Population classes
3
2
1 4
Unit
% of area
Areal weighting
Land cover
1
11.5%
418
898
2
8.8%
319
858
3
75.6%
2,741
1,488
4
4.1%
145
397
Total
100%
3,623
3,623
Ancillary data sources Ancillary data sources • • • •
Land cover Land cover Imperviousness Road networks Road networks Parcels
Address Point Datasets Address Point Datasets How well do address points perform as a source of ancillary data for dasymetric mapping to support ancillary data for dasymetric mapping to support small area population estimates?
Methodology • Counties in Ohio (12 total) ( ) – Address point data available – Population change 2000‐2008