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Yes, I've set the option to INTEGER in the lower portion of the tool's dialog box.
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05-04-2018
09:54 AM
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Thanks Chris for the process diagram! I am using ArcMAP (desktop). I started a depressionless DEM, and then proceeded to executethe Hydro Arctoolbox algorithms to generate FILL.img (input raster set to original depressionless DEM.img, FLOWDIRECTION.IMG (input raster set to FILL.img), and then finally FLOWACC.IMG (input raster set to FLOWDIRECTION.img). In other threads I heard that there is a maximum size for a DEM after which the classes become too many and count be counted, thus the greying out of the attribute table of this raster layer. I am trying to calculate the total accumulation of water (in acres or sq miles) overlayed on top of 5 separate Landsat scenes I have loaded in the .mxd. Thanks!
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05-04-2018
09:42 AM
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I have 2 DEMs of a portion of Eastern PA in ArcMap: one is a large area in Pennsylvania another DEM is a smaller clipped polygon within the larger one. When I try to conduct Hydrology Tool analysis (Fill, Flow, and accumulation) the raster I generate in the TOC for the larger polygon area does not allow me to access an attribute table. For the flow accumulation raster I selected INTEGER not FLOAT per my lab instructions. My project requires me to access the table to calculate the number of cells accumulating to a surface area. I read on another thread that ArcGIS will grey out the attribute table if the raster accumulation tool has too many classes to calculate. I am attempting to try the process on the smaller polygon to access the attribute table. What is the class number cutoff that ArcMAP has for prohibiting access to the attribute table? Is there a threshold area for a polygon after which it becomes disabled?
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05-04-2018
06:29 AM
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