User`s guide

20-3
If you have vector map data sets that violate these conditions, the map display functions
geoshow, mapshow, and mapview might not be capable of rendering them as filled
polygons. To determine the directionality of polygon vertices, use the logical function
ispolycw, which returns a separate result for each NaN-delimited polygon in an
array of vertices. If you find inner rings which are clockwise or outer rings which are
counterclockwise, use the utility functions poly2ccw or poly2cw, respectively, to
reverse the direction of those rings.
Map Viewer Now Georeferences Images It Saves
When the Map Viewer saves the visible or selected area as a raster map (an image file), it
now also writes a worldfile to georeference the image.
TIGER/Line File Support Upgraded
Function tgrline now supports the most recent (2003/2004) TIGER/Line data sets from
the U.S. Bureau of the Census.