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Identifying depression contours for symbolization

Question asked by jlandwehr on Jan 10, 2019

We have contour data and I am looking to reclassify all the depression lines so they can be symbolized with hachured edges. I haven't been able to find a good way to search for all descending elevations and select them for reclassification. I've seen the raster answer, which identifies the sinks but that requires a manual process. I'm looking for an expression or some sort of automated way to achieve this.