Use the flow_direction_type parameter to specify which method was used when the flow direction raster was created. Output cells with a high flow accumulation are areas of concentrated flow and can be used to identify stream channels. The Flow Accumulation tool calculates accumulated flow as the accumulated weight of all cells flowing into each downslope cell in the output raster. How To: Convert flow accumulation lines from a DEM file to a polyline shapefile in ArcMap Summary. Diese Methode der Ableitung der Abflussakkumulation aus einem DEM wird in Jenson und Domingue (1988) dargestellt. When using parallel processing, temporary data will be written to manage the data chunks being processed. The current processing cell is not considered in this accumulation. The result of Flow Accumulation is a raster of accumulated flow to each cell, as determined by accumulating the weight for all cells that flow into each downslope cell. This video is about understanding the concept behind flow accumulation. The distance is calculated between cell centers. ArcGIS for Developers ... (GP) tool also accepts a flow accumulation threshold raster. The accumulated flow is based on the number of total or a fraction of cells flowing into each cell in the output raster. The input flow direction raster can be of type D8, Multi Flow Direction (MFD) or D-Infinity (DINF). The result of Flow Accumulation is a raster of accumulated flow to each cell, as determined by accumulating the weight for all cells that flow into each downslope cell.. In such a case, the weight raster may be a continuous raster representing average rainfall during a given storm. The flow direction raster can be created using D8, Multiple Flow Direction (MFD) and D-Infinity methods. Highlights The WASI algorithm that calculates weighted flow-accumulation by considering man-made stormwater infrastructure is presented. The result of Flow Accumulation is a raster of accumulated flow to each cell, as determined by accumulating the weight for all cells that flow into each downslope cell. Zellen mit einer Abflussakkumulation von 0 sind lokale topographische Höhen und können verwendet werden, um Bergkämme zu identifizieren. The input raster that shows the direction of flow out of each cell. Apply this threshold, by reclassifying the flow accumulation grid to 1 - where the threshold is exceeded - and to 0 - where the threshold is below. This is calculated as follows: maximum_drop = change_in_z-value / distance * 100. The default temp folder location will be on your local C drive. In general, Flow Accumulation value (at pour point A) = cell count of Watershed for pour point A - 1. Cells of undefined flow direction will only receive flow; they will not contribute to any downstream flow. MFD —The input flow direction raster is of type Multi Flow Direction (MFD). "On the Extraction of Channel Networks from Digital Elevation Data." 1) Determine your streams You have calculated a flow accumulation grid, the basis for a stream network. These are D8, Multiple Flow Direction (MFD) and D-Infinity (DINF) flow methods. Tarboton, D. G., R. L. Bras und I. Rodriguez–Iturbe. The Flow Accumulation function calculates accumulated flow as the accumulated weight of all cells flowing into each downslope cell in the output raster. These are D8, Multiple Flow Direction (MFD) and D-Infinity (DINF) flow methods. Illustration Flow_Acc = FlowAccumulation(Flow_Dir) Usage. If the flow direction contains a loop, Flow Accumulation will go into an endless cycle and never finish. FLOAT —The output raster will be floating point type. The values for each direction from the center are the following: Mit der Spatial Analyst-Lizenz verfügbar. This tool supports parallel processing. The Flow Accumulation tool does not honour the Compression environment setting. Dies kann auch als die Niederschlagsmenge bezeichnet werden, die auf der Oberfläche auf höher gelegenen Flächen von den einzelnen Zellen auftraf. This video demonstrates how to calculate flow direction in ESRI ArcGIS. Additional details on how flow accumulation is calculated. Usage. The data has been through a "fill" procedure once. If the input data is smaller than 5,000 by 5,000 cells in size, fewer cores may be used. Verwendung. The Flow Accumulation tool supports three flow modeling algorithms while computing accumulated flow. If no weight raster is specified, a default weight of 1 will be applied to each cell. Output cells with a flow accumulation of zero are local topographic highs and can be used to identify ridges. Creates a raster of accumulated flow into each cell. The output accumulation raster can be integer, floating point, or double type. Here is a quick overview of the steps for delineating a watershed in ArcGIS – we have detailed directions later. Allen anderen Zellen wird NoData zugewiesen. New software can provide more accurate hydrologic information than other commercial GIS software such as IDRISI and ArcGIS. Wenn kein Gewichtungs-Raster angegeben ist, wird eine Gewichtung von 1 auf die Zellen angewendet, und der Wert der Zellen im Ausgabe-Raster entspricht der Anzahl von Zellen, die in jede Zelle fließen. Then a bit of map algebra in the raster calculator yields LS. If no weight raster is provided, a weight of one is applied to each cell, and the value of cells in the output raster will be the number of cells that flow into each cell. The result of Flow Accumulation is a raster of accumulated flow to each cell, as determined by accumulating the weight for all cells that flow into each downslope cell.. An optional input raster for applying a weight to each cell. 2) This is odd and I wouldn't expect the value ranges to be different for FGDB and TIFF rasters. INTEGER —The output raster will be integer type. New software named the WASI surface runoff calculator, is developed and can be applied to urban and suburban areas. To calculate in ArcGIS first calculate the SLOPE, FLOW DIRECTION then FLOW ACCUMULATION from DEM for your area (SRTM, 1 arc, is better than ASTER, seen in many published papers). # Requirements: Spatial Analyst Extension, # Check out the ArcGIS Spatial Analyst extension license, "C:/sapyexamples/output/outflowacc02.img", Analysis environments and Spatial Analyst. The result of Flow Accumulation is a raster of accumulated flow to each cell, as determined by accumulating the weight for all cells that flow into each downslope cell. In order to obtain the watershed delineation we will need to follow some predefined steps and obtain the Flow direction and the Flow accumulation and obtain the for each cell in the DEM the number of cells that are flowing into them. Learn more about how Flow Accumulation works. Creates a raster of flow direction from each cell to its steepest downslope neighbor. Eingabe-Raster oder Eingabe-Wert wenn Bedingung WAHR, Eingabe-Raster oder Eingabe-Wert wenn Bedingung FALSCH, Photogrammetric Engineering and Remote Sensing, Durchführen eines bedingungsabhängigen Vorgangs mit dem Werkzeug. The only In such a case, the weight raster may be a continuous raster representing average rainfall during a given storm. Using a threshold raster is particularly useful when pour points do not exist and watersheds need to be generated for the entire DEM based on the junctions of a stream network that has been derived from flow accumulation. The problem is that there is no tutorial about how the implementation works in ArcGIS ... To calculate the LS factor for the RUSLE equation, first calculate flow accumulation (facc) and slope in degrees (slp). (1991) beschrieben. Dies wird unter Identifizieren von Wasserlaufnetzen erläutert. The flow accumulation map was produced using the flow direction map, which was produced from the digital elevation model (DEM) of the river Evros river basin, in the ArcGIS 10.1 software. Usage. Das Ergebnis von Flow Accumulation ist ein Raster der Abflussakkumulation zu jeder Zelle, wie durch das Akkumulieren der Gewichtung für alle Zellen, die in die einzelnen tiefer gelegenen Zelle fließen, bestimmt.. Zellen mit nicht definierter Fließrichtung erhalten nur Fluss; sie tragen nicht zum Wasserstrom flussabwärts bei. Input flow direction can be created using the D8, Multiple Flow Direction (MFD) or D-Infinity (DINF) methods. See Analysis environments and Spatial Analyst for additional details on the geoprocessing environments that apply to this tool. A-D have flow criss-crossing the yellow boundary and again at any given time have a different stream flow peak than each other - largely flowing into the yellow zone. Die Ausgabe des Werkzeugs bezieht sich in diesem Fall auf die Niederschlagsmenge, die durch die einzelnen Zellen abfließt, wobei davon ausgegangen wird, dass der Niederschlag komplett abfließt und nicht abgefangen wurde, verdunstet und/oder transpiriert ist oder ins Grundwasser abgeflossen ist. Raster data, such as DEMs, can be converted to vector datasets to increase analytical capabilities. "Extracting Topographic Structure from Digital Elevation Data for Geographic Information System Analysis." In order to derive actual stream, you need to decide on a threshold at which a stream is formed. Das Werkzeug Abflussakkumulation berechnet die Abflussakkumulation als kumulierte Gewichtung aller Zellen, die in tiefer gelegene Zellen im Ausgabe-Raster fließen. Output cells with a high flow accumulation are areas of concentrated flow and can be used to identify stream channels. Calculating the flow accumulation at point O seems straight forward with a hydrologic model, but I support you in that the calculations you are trying to make are difficult. These are D8, Multiple Flow Direction (MFD) and D-Infinity (DINF) flow methods. You can control the number of cores the tool uses with the Parallel processing factor environment. Now I am making my own algorithm and R codes that calculate flow accumulation based on flow direction, and the test of the codes and algorithm will be done in a couple of months. The Hydrology tools are used to model the flow of water across a surface. The type of input flow direction raster between these three influences how the Flow Accumulation tool partitions and accumulates flow in each cell. Cells of undefined flow direction will only receive flow; they will not contribute to any downstream flow. For an input D-Infinity flow direction raster, a cell is considered to have an undefined flow direction if its value in the flow direction raster is -1. Flow accumulation in its simplest form is the number of upslope cells that flow into each cell. Learn more about how Flow Accumulation works. If you have admin privileges on your machine, you can also use a registry key (for example, [HKEY_CURRENT_USER\SOFTWARE\ESRI\Desktop10.6\Raster]). If the input flow direction raster is not created with the Flow Direction tool, there is a chance that the defined flow could loop. A watershed is the upslope area that contributes flow to a common outlet as concentrated drainage. Zum Erstellen eines Rasters, in dem der Wert 1 das Wasserlaufnetz vor dem Hintergrund von NoData-Werten darstellt, kann beispielsweise eine der folgenden Methoden verwendet werden: Eingabe-Raster oder Eingabe-Wert wenn Bedingung WAHR : 1, Eingabe-Raster oder Eingabe-Wert wenn Bedingung FALSCH : 1. This example creates a raster of accumulated flow into each cell of an input flow direction Grid raster. If no weight raster is provided, a weight of 1 is applied to each cell, and the value of cells in the output raster is the number of cells that flow into each cell. The flow direction raster can be created using the Flow Direction tool. Zellen mit einer hohen Abflussakkumulation sind Flächen konzentrierten Flusses und können verwendet werden, um Wasserlaufkanäle zu identifizieren. This is the default. You can control the location of this folder by setting up a system environment variable named TempFolders and specifying the path to a folder to use (for example, E:\RasterCache). For example, the expression to create a raster where the value one represents a stream network on a background of NoData could be: The output of the Flow Direction tool is an integer raster whose values range from 1 to 255. Could you please share the input flow direction raster that was used to create flow accumulation with me and I can investigate this further. A sample usage of the Flow Accumulation tool with an input weight raster might be to determine how much rain has fallen within a given watershed. The Flow Accumulation tool supports three flow modeling algorithms while computing accumulated flow. Note that you should carefully review the ArcGIS … I am trying to run ArcGIS 10.1 flow accumulation on a 10000 x 10000 cell unsigned 8Bit integer flow model (but 80% of that is no data). Example. Mit der Spatial Analyst-Lizenz verfügbar. The direction of flow is determined by the direction of steepest descent, or maximum drop, from each cell. Mit dem Werkzeug Abflussakkumulation in Verbindung mit einem Eingabe-Gewichtungs-Raster kann beispielsweise bestimmt werden, wie viel Niederschlag in einem bestimmten Abflussgebiet gefallen ist. ArcGIS can obtain the total area of flowing into this specific point, also called pour point. Calculating flow accumulation: Release 9.3 Last modified January 13, 2012: Print all topics in : "Hydrologic analysis" Related Topics Exploring Digital Elevation Models (DEM) Deriving runoff characteristics ; Creating a depressionless DEM ; Determining flow direction ; Delineating watersheds ; Hydrologic analysis sample applications; Note: This topic was updated for 9.3.1. Cells of undefined flow direction will only receive flow; they will not contribute to any downstream flow. The Flow Accumulation tool calculates accumulated flow as the accumulated weight of all cells flowing into each downslope cell in the output raster. Learn more about how Flow Direction works. The current processing cell is not considered in this accumulation. The Parallel processing with Spatial Analyst help topic has more details on this capability and how to configure it. The result of Flow Accumulation is a raster of accumulated flow to each cell, as determined by accumulating the weight for all cells that flow into each downslope cell. Die Ergebnisse von Abflussakkumulation können verwendet werden, um durch das Anwenden eines Schwellenwertes zur Auswahl von Zellen mit einer hohen Abflussakkumulation ein Wasserlaufnetz zu erstellen. DOUBLE —The output raster will be double type. This example creates a raster of accumulated flow into each cell of an input flow direction IMG raster. Illustration Flow_Dir = FlowDirection(Elev_Ras) Usage. If your computer has multiple processors or processors with multiple cores, better performance may be achieved, particularly on larger datasets. Photogrammetric Engineering and Remote Sensing 54 (11): 1593–1600. In der folgenden Grafik sind im Bild oben links die Fließrichtung aus jeder Zelle und oben rechts die Anzahl der Zellen, die in jede Zelle fließen, zu sehen. David Tarboton: Hydrology Research Group - Terrain Analysis Using Digital Elevation Models (TauDEM) The Flow Accumulation tool supports three flow modeling algorithms while computing accumulated flow. DINF —The input flow direction raster is of type D-Infinity (DINF). In diesem Fall kann das Gewichtungs-Raster ein kontinuierliches Raster sein, das die durchschnittliche Niederschlagsmenge während eines bestimmten Sturms darstellt. By applying a threshold value to the results of the Flow Accumulation function using Map Algebra (or the Con tool in geoprocessing), a stream network can be delineated. 1988. By default, this tool will use 50 percent of the available cores. ArcGIS can compute from the DEM the direction of flow down a slope and how many cells “flow into” each cell (called flow accumulation). Example. The accumulated flow is based on the number of total or a fraction of cells flowing into each cell in the output raster. # Description: Creates a raster of accumulated flow to each cell. Für die zukünftige Verarbeitung ist es wichtig, dass das Wasserlaufnetz, bestehend aus einer Reihe von linearen Raster-Features, als Werte vor einem Hintergrund von NoData-Werten dargestellt wird. Cells with a flow accumulation of 0 are local topographic highs and may be used to identify ridges. D8 —The input flow direction raster is of type D8. By applying a threshold value to the results of the Flow Accumulation tool using either the Con or Set Null tools, a stream network can be delineated. For each cell in the output raster, the result will be the number of cells that flow into it. Use the Input flow direction type to specify which method was used when the flow direction raster was created. If no weight raster is provided, a weight of 1 is applied to each cell, and the value of cells in the output raster is the number of cells that flow into each cell. The mapping platform for your organization, Free template maps and apps for your industry. Das Werkzeug Abflussakkumulation berechnet die Abflussakkumulation als kumulierte Gewichtung aller Zellen, die in tiefer gelegene Zellen im Ausgabe-Raster fließen. If you have admin privileges on your machine, you can also use a registry key (for example, [HKEY_CURRENT_USER\SOFTWARE\ESRI\Desktop10.6\Raster]). Hydrological Processes 5: 81–100. The output raster will always be uncompressed. A weight factor can optionally be applied. Jenson, S. K. und J. O. Domingue. Flow accumulation in its simplest form is the number of upslope cells that flow into each cell. For an input D8 flow direction raster, a cell is considered to have an undefined flow direction if its value in the flow direction raster is anything other than 1, 2, 4, 8, 16, 32, 64, or 128. This is the default. Procedure. Flow accumulation means add all the flow entering into the particular cell. A digital elevation model (DEM) is a raster representation of a continuous surface in which each cell represents the elevation at a location. A sample usage of the Flow Accumulation tool with an input weight raster might be to determine how much rain has fallen within a given watershed. Eine analytische Methode der Bestimmung eines entsprechenden Schwellenwertes für die Wasserlaufnetzbegrenzung wird in Tarboton et al. 1991. 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