Maps by Computer – Part 2 GEOG 3530/8535 University of Nebraska at Omaha.

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Presentation transcript:

Maps by Computer – Part 2 GEOG 3530/8535 University of Nebraska at Omaha

Slivers

Accuracy: 0.001” Repeatability: 0.003” Impossible to hold hand steady at that degree of resolution. Digitizer x coordinate y coordinate

Arc Begin Node End Node Right Poly Left Poly 1 I II A 0 2 II III B 0 3 III IV C 0 4 V I B 0 5 III V B C 6 IV V D C 7 I IV D A 8 II IV A B Arc/Node Topology

Slivers make polygons Simple PolygonArc/node Polygon Conversion Expected 200 polygons After conversion, we had over 10,000 polygons Solution: Deleted smallest polygons and merged with surrounding polygon.

Merging Polygons

Redistricting – electoral, congressional

Coordinate Transformations 2x transformation 2,2 becomes 4,4 4,4 becomes 8,8

Rotation u = cos (radang) v = sin (radang) for i = 1, n tempx = x(i) * u + y(i) * v y(i) = -x(i) * v + y(i) * u x(i) = tempx next i

Interpolation What does squaring the distances do? What would the value be if distances cubed?

Object Graphics - Illustrator

Coordinates

Raster Overlay How many commercial/100 year flood pixels?

Overlay

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