Plot on a figure generated with imagesc()

[José Luis García Pallero]

Hello,
I have a digital elevation model as a matrix that I plot via imagesc()
function. Later I need to plot some coastlines on the previous plot.
As the axis of coordinates generated with imagesc() account for the
pixel index I don't know how can I plot the coastline without
transform the coordinates to the limits defines by the rows and
columns of the image. Exists any function to plot with imagesc and
produce a "referenced" (other coordinates different of the rows and
columns) image?

Thanks

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José Luis García Pallero
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