I'm trying to find thinned forest stands by creating a model in Modelbuilder. Thinned stands can be identified in aerial photos by having parallell lines. For example stands 238907, 238865 in screenshot below have been thinned, and stands 239116 and 238864 have not been thinned. The avaiIible data is aerial photos (raster data) and the stand borders (polygon layer). Anyone have any ideas how this can be done?