在python中转换坐标

Question

I have one coordinate system 4.3, 50.8, 4.4, 50.9 and I want to convert points in that box to a box that is 4800X4800 pixels. Is there anything in the python language that can help do these conversions or do I have to write the math myself?

Answer 1

You could write something like this:

def remap_coords(x, y, x_min=4.3, y_min=50.8,
                 x_max=4.4, y_max=50.9, width=4800, height=4800):
    new_x = (x - x_min) / (x_max - x_min) * width
    new_y = (y - y_min) / (y_max - y_min) * height
    return (int(round(new_x)), int(round(new_y)))

Answer 2

If I have understood what you require, then I would recommend numpy for this: http://www.numpy.org/

Here are the methods I would use:

y = numpy.linspace(50.8,50.9,4800)
x = numpy.linspace(4.3,4.4,4800)
x,y = numpy.meshgrid(x,y)

linspace will generate, in this instance, 4800 values linearly interpolated between 50.8 and 50.9 for y and 4.3 and 4.4 for x. meshgrid is then employed to form these 1D coordinate arrays into two 2D coordinate arrays (both of size 4800 by 4800 pixels) for both the x and y values.