Figure 2From: Using GIS for spatial analysis of rectal lesions in the human bodyBounding coordinates and polygons for anatomic regions. Distance and position on the rectal wall were entered into the GIS and plotted as points on a two-dimensional plane. The x-axis represents position on the rectal wall, measured in either radial degrees, centimeters, clock-face position, or quadrant. The y-axis represents distance from the dentate line measured in centimeters. Polygons were then created by digitizing from bounding coordinates.Back to article page