For Output raster, specify an output name in the desired geodatabase location.Updating the properties of the AnimatedFlowRenderer. In this example, the input is FlowAcc_Flow1. AnimatedFlowRenderer visualizing wind direction with default values applied. For Input accumulation raster, select the raster output from Step 3.In this example, the input is Pour_point. For Input raster or feature pour point data, select the feature output from Step 4.Refer to ArcGIS Pro: Point for steps to do so.Дetermine the location of the pour point on the map using the flow accumulation raster layer as reference. In this example, the point feature class Name and Alias are PourPoint and Pour_point, respectively. Refer to ArcGIS Pro: Create a feature class for steps to do so. Create a point feature class with the same coordinate system as the DEM layer in Step 1.Create a point feature representing the pour point of the watershed.For every cell in the surface grid, the ArcGIS grid processor finds the direction of steepest downward descent. For more information, refer to ArcGIS Pro: How Flow Accumulation works. This is accomplished with the Calculate Flow Direction menu choice. Yellow 128 direction grids from fdr show through where fac is NoData.ДЇourth Image - portion of third image showing results of the identify tool click on circled grid cell.The Flow Accumulation tool calculates the accumulated flow into each cell, as determined by the accumulated weight of cells that flow into each downslope cell. The direction of the flow out of each cell is shown as a raster in the map. Specify the location of the Output flow direction raster. Use the output from Step 1 as the Input surface raster. Third Image - facВ turned on over the fdr grid. Navigate to Spatial Analyst Tools > Hydrology > Flow Direction.

For more information, refer to ArcGIS Pro: How Flow Direction works. Second Image - fdr with the 128 valued cells in yellow to highlight them. Note: The Flow Direction tool using the D8 flow method aligns flow direction to the steepest downslope neighbor.

It is not being created as a signed grid.Д¬an anyone shed light on why this is happening?ДЇirst Image - fdr grid and some flow path tracing lines. In an older 'successful' hydrology effort the fdr grid was an unsigned grid. So, in an 8 bit signed integer raster, there can be no +128 which would make the 'D8' flow direction type, it would make sense to use -128 for a signed integerВ grid (and the flow pathВ tracing tool works with it). A search confirms that in an 8 bit systemВ 8-BIT UNSIGNED: 0 to 256 8-BIT SIGNED : -128 to 127. The resulting fdr grid is a 'signed integer' which means it can have +/- values. My expectation was that the fdr value would be a positive 128, and the fac would be ever increasing. The forth image is a portion of the third image showing the identify tool results on the right and the yellow cell that was selected circled with a blue line as well as the results circled on the right. It should continue and the cells should get darker along the flow direction (having higher and higher accumulation). When this happens the flow accumulation starts over. You see the yellow cells вЂњshowing throughвЂќ b/c the fac grid shows NoData. The first image shows the fdr grid and some flow pa. For some reason, the flow direction grid (fdr) has the north east direction as -128 instead of +128 as I assume it should be. In the third image, I show the flow accumulation grid ( fac) turned on over the fdr grid. Arc Hydro v10.8.0.34, ArcGIS Desktop v10.8.1 (both 32 bit) My flow accumulation grid (fac) is not being created correctly. They are 128 in the table of contents, but using the i tool they show as -128. In the second image, I show the fdr with the 128 valued cells in yellow to highlight them. I have deleted and repeated the creation of the fdr grid using SA and Arc Hydro tools. This may not be an issue, but all the examples have 128 instead of -128. Flow d rection Flow direction grid Grid datasset Feature class dataset Function Legend Optional Function Bowling lakes Fencing Co n tiu e dr c processing with flow accumulation function A l t e r n a t i v e P r o c e s s i n g Fill sinks DEM grid HydroDEM (1) grid Adjust flow direction in lakes Flow direction Grid (2) Start DEM. These are correct event thought the value of the fdr grid is -128. The first image shows the fdr grid and some flow path tracing lines. For some reason, the flow direction grid ( fdr) has the north east direction as -128 instead of +128 as I assume it should be. My flow accumulation grid ( fac) is not being created correctly.

Flow direction arcgis