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Nor does it need one. Every zonal calculation employs two grids: one, which must have an attribute table, designates the zones. The other contains the values to be summarized by zone. It does not need to have an attribute table (and often does not). In this case the RegionGrouped grid plays the former role (and it will have an attribute table) and the Euclidean distance grid plays the latter role. Your comment suggests you just need to get clear about which grid is which. Thank you for your help, Bill! I have got the result I want
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03-29-2012
08:23 AM
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Thank you for the clarification: you seek the point furthest within the interior of each region. (It's related to the old joke about how far can a person go into the woods. Answer: halfway; after that, they are going out again.) Perhaps surprisingly, my previous solution applies after some preparation: RegionGroup the grid to obtain zones. Compute the Euclidean Distance grid for the complementary region (presumably, the one indicated by zeros). The values in the zonal maximum grid give, region by region, the "deepest" interior distance. Comparing the zonal max to the euclidean distance, as I described earlier, produces a binary grid identifying all the deepest points in all the regions. Thank you Bill! Logically, this should work. But the result of Euclidean Distance doesn't have a attribute table. So that it is not allowed to be used to compute the zonal maximum grid. What is the result of regiongroup used for in the preparation?
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03-15-2012
11:13 AM
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Compare the original grid to the zonal minimum grid: the places of equality are the deepest within their regions. Thank you Bill for your reply! I think I didn't make myself clear. my original grid is a binary grid,only have value 0 or 1. And I want to get the morphological deepest point of the area with value 1.picture below shows the deepest point I want. [ATTACH=CONFIG]12665[/ATTACH]
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03-14-2012
09:37 AM
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Hi, I have a raster in which each region represents a settlement. I want to get the deepest point of each region. But in zonal geometry, the thickness tool is to give each cell the max_thick value, though it uses the deepest point to calculate. How can I get the deepest point data from this tool?
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03-13-2012
10:48 AM
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