An algorithm is described designed to locate and connect linear features with identical characteristics on multispectral images. The input is a map of magnitudes (PM(i,j)) and line orientations (PR(i,j)) produced by an edge and curve detection algorithm which uses a window of 5x5 pixels centered at every pixel belonging to an edge and looks for a preferred line in that pixel along 0°, 45°, 90° or 135° (PR=1,2,3,4,. PR=5 means indetermined orientation). Noisy results coming from the local line detection operation are avoided using a radiometric corrected input image on a combination of bands together with an appropriate threshold.
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