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Try "STATEFIPS = 1 OR STATEFIPS = 12". Your current expression is effectively "(STATEFIPS = 1) or (12)", and since "12" will always evaluate to true this results in all features being selected.


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To help with the "proper definition" part of your question; you have looked at https://en.wikipedia.org/wiki/Convex_hull and gotten what could well be considered a "proper" definition but found it lacking, so perhaps a more "useful" definition For every point inside a convex hull, a straight line to any point not within the hull will only intersect the hull ...


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Vince's comments led me to look again at Shapely in Python, and it can do it. In short, the method I used was: get the bounding box of the page/object you want calculate the diagonal of this box, as this will be the minimum length your hatch lines need to be draw a square array of horizontal lines centred on the bounding box's centre, each spaced suitably ...


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I think this post in the SAGA GIS forum might prove useful in answering your question about how slope is calculated: https://sourceforge.net/p/saga-gis/discussion/354013/thread/27ecdc6b/ Also, based on my understanding of TWI (as a PhD hydrology student involved in hydrologic modeling), the D-Inf (Tarboton), MFD-md (Qin), DEMON (Costa-Cabral), and MFD ...



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