find and set point in the center of an ellipse

ZarzuraMeyer

Dear Forum,

does anyone have an idea how to find the coordinates in the center of an ellipse an set a point there? I have a file with 8 ellipses in the area that i examine. (produced with the drawing function and converted to polygons)Now i want to get out the center coordinates of every ellipse and then the result should be a point file with these centerpoints. I have no idea and hope you'll help

thank you

Chris

KarlOrmer

For part a) of your task (find center of an ellipse) i got a solution for a circle which should be the same for an ellipse:

import arcgisscripting
gp = arcgisscripting.create(9.3)
print 'Geoprocessor initialised'
circle_path = ur'c:/test/circles.shp'

cursor = gp.SearchCursor(circle_path)
center_points = list()

# let's iterate over all rows in the circle shape
for row in iter(cursor.next, None):
    # get the circle polygon
    circle = row.shape
    # get xmin, xmax etc.
    x_min = circle.extent.XMin
    y_min = circle.extent.YMin
    x_max = circle.extent.XMax
    y_max = circle.extent.YMax
    center_x = x_max - x_min
    center_y = y_max - y_min
    center_points.append((center_x, center_y))

print center_points

If that works you only need a solution for b)