how to calculate flow accumulation in arcgis

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. Use the flow_direction_type parameter to specify which method was used when the flow direction raster was created. The Parallel processing with Spatial Analyst help topic has more details on this capability and how to configure it. The current processing cell is not considered in this accumulation. The input flow direction raster can be of type D8, Multi Flow Direction (MFD) or D-Infinity (DINF). Raster data, such as DEMs, can be converted to vector datasets to increase analytical capabilities. DINF —The input flow direction raster is of type D-Infinity (DINF). A weight factor can optionally be applied. The default temp folder location will be on your local C drive. Highlights The WASI algorithm that calculates weighted flow-accumulation by considering man-made stormwater infrastructure is presented. This is the default. Then a bit of map algebra in the raster calculator yields LS. Cells of undefined flow direction will only receive flow; they will not contribute to any downstream flow. Flow accumulation means add all the flow entering into the particular cell. This is calculated as follows: maximum_drop = change_in_z-value / distance * 100. (1991) beschrieben. This is the default. ArcGIS can obtain the total area of flowing into this specific point, also called pour point. 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. "Extracting Topographic Structure from Digital Elevation Data for Geographic Information System Analysis." 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. 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. 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. Output cells with a flow accumulation of zero are local topographic highs and can be used to identify ridges. The output accumulation raster can be integer, floating point, or double type. Dies wird unter Identifizieren von Wasserlaufnetzen erläutert. 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. 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. How To: Convert flow accumulation lines from a DEM file to a polyline shapefile in ArcMap Summary. The accumulated flow is based on the number of total or a fraction of cells flowing into each cell in the output raster. 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. Dies kann auch als die Niederschlagsmenge bezeichnet werden, die auf der Oberfläche auf höher gelegenen Flächen von den einzelnen Zellen auftraf. Cells of undefined flow direction will only receive flow; they will not contribute to any downstream flow. Here is a quick overview of the steps for delineating a watershed in ArcGIS – we have detailed directions later. 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.. ArcGIS can compute from the DEM the direction of flow down a slope and how many cells “flow into” each cell (called flow accumulation). If the input data is smaller than 5,000 by 5,000 cells in size, fewer cores may be used. ArcGIS for Developers ... (GP) tool also accepts a flow accumulation threshold raster. 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. Calculating the direction of flow. 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.. DOUBLE —The output raster will be double type. You can control the number of cores the tool uses with the Parallel processing factor environment. The Flow Accumulation tool calculates accumulated flow as the accumulated weight of all cells flowing into each downslope cell in the output raster. 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. In such a case, the weight raster may be a continuous raster representing average rainfall during a given storm. In diesem Fall kann das Gewichtungs-Raster ein kontinuierliches Raster sein, das die durchschnittliche Niederschlagsmenge während eines bestimmten Sturms darstellt. 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). INTEGER —The output raster will be integer type. 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 mapping platform for your organization, Free template maps and apps for your industry. 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. This video is about understanding the concept behind flow accumulation. Learn more about how Flow Accumulation works. Learn more about how Flow Accumulation works. The distance is calculated between cell centers. This example creates a raster of accumulated flow into each cell of an input flow direction Grid raster. Illustration Flow_Acc = FlowAccumulation(Flow_Dir) Usage. Example. The accumulated flow is based on the number of total or a fraction of cells flowing into each cell in the output raster. The output raster will always be uncompressed. Learn more about how Flow Direction works. 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. 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 type of input flow direction raster between these three influences how the Flow Accumulation tool partitions and accumulates flow in each cell. Photogrammetric Engineering and Remote Sensing 54 (11): 1593–1600. Apply this threshold, by reclassifying the flow accumulation grid to 1 - where the threshold is exceeded - and to 0 - where the threshold is below. The Flow Accumulation tool supports three flow modeling algorithms while computing accumulated flow. 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]). Flow accumulation in its simplest form is the number of upslope cells that flow into each cell. MFD —The input flow direction raster is of type Multi Flow Direction (MFD). Usage. Mit der Spatial Analyst-Lizenz verfügbar. By default, this tool will use 50 percent of the available cores. In beiden Beispielen wird allen Zellen mit mehr als 100 Zellen, die in sie abfließen, der Wert 1 zugewiesen. Output cells with a high flow accumulation are areas of concentrated flow and can be used to identify stream channels. The current processing cell is not considered in this accumulation. 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. This video demonstrates how to calculate flow direction in ESRI ArcGIS. 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). 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. Output cells with a high flow accumulation are areas of concentrated flow and can be used to identify stream channels. # Description: Creates a raster of accumulated flow to each cell. If the input flow direction raster is not created with the Flow Direction tool, there is a chance that the defined flow could loop. "On the Extraction of Channel Networks from Digital Elevation Data." FLOAT —The output raster will be floating point type. For each cell in the output raster, the result will be the number of cells that flow into it. This example creates a raster of accumulated flow into each cell of an input flow direction IMG raster. In general, Flow Accumulation value (at pour point A) = cell count of Watershed for pour point A - 1. The only 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. The Flow Accumulation tool supports three flow modeling algorithms while computing accumulated flow. This tool supports parallel processing. Note that you should carefully review the ArcGIS … Creates a raster of flow direction from each cell to its steepest downslope neighbor. Cells of undefined flow direction will only receive flow; they will not contribute to any downstream flow. An optional input raster for applying a weight to each cell. Diese Methode der Ableitung der Abflussakkumulation aus einem DEM wird in Jenson und Domingue (1988) dargestellt. The Flow Accumulation tool supports three flow modeling algorithms while computing accumulated flow. Jenson, S. K. und J. O. Domingue. 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. In order to derive actual stream, you need to decide on a threshold at which a stream is formed. For example, the expression to create a raster where the value one represents a stream network on a background of NoData could be: Flow accumulation in its simplest form is the number of upslope cells that flow into each cell. The direction of flow is determined by the direction of steepest descent, or maximum drop, from each cell. If no weight raster is specified, a default weight of 1 will be applied to each cell. Hydrological Processes 5: 81–100. Mit dem Werkzeug Abflussakkumulation in Verbindung mit einem Eingabe-Gewichtungs-Raster kann beispielsweise bestimmt werden, wie viel Niederschlag in einem bestimmten Abflussgebiet gefallen ist. The data has been through a "fill" procedure once. Allen anderen Zellen wird NoData zugewiesen. D8 —The input flow direction raster is of type D8. 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. The Flow Accumulation function calculates accumulated flow as the accumulated weight of all cells flowing into each downslope cell in the output raster. The output raster that shows the accumulated flow to each cell. 1988. 1991. When using parallel processing, temporary data will be written to manage the data chunks being processed. Input flow direction can be created using the D8, Multiple Flow Direction (MFD) or D-Infinity (DINF) methods. The Flow Accumulation tool calculates accumulated flow as the accumulated weight of all cells flowing into each downslope cell in the output raster. 1) Determine your streams You have calculated a flow accumulation grid, the basis for a stream network. In such a case, the weight raster may be a continuous raster representing average rainfall during a given storm. 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. 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. The values for each direction from the center are the following: Mit der Spatial Analyst-Lizenz verfügbar. 2) This is odd and I wouldn't expect the value ranges to be different for FGDB and TIFF rasters. If your computer has multiple processors or processors with multiple cores, better performance may be achieved, particularly on larger datasets. The flow direction raster can be created using the Flow Direction tool. (Step 2) Calculate Flow Accumulation with Flow Accumulation Tool using flow direction data as the input raster, (Step 3) Calculate slope of watershed in degrees using Slope Tool using clipped watershed DEM as the input layer, and (Step 4) Copy and paste the LS-factor formula below into Raster Calculator: The flow direction raster can be created using D8, Multiple Flow Direction (MFD) and D-Infinity methods. Creates a raster of accumulated flow into each cell. David Tarboton: Hydrology Research Group - Terrain Analysis Using Digital Elevation Models (TauDEM) Example. Could you please share the input flow direction raster that was used to create flow accumulation with me and I can investigate this further. Cells with a flow accumulation of 0 are local topographic highs and may be used to identify ridges. New software can provide more accurate hydrologic information than other commercial GIS software such as IDRISI and ArcGIS. Tarboton, D. G., R. L. Bras und I. Rodriguez–Iturbe. These are D8, Multiple Flow Direction (MFD) and D-Infinity (DINF) flow methods. 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. 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. Value ranges to be different for FGDB and TIFF rasters derive actual,... Such a case, the basis for a stream is formed... ( GP tool... Be written to manage the data chunks being processed a loop, flow accumulation in its form! Weighted flow-accumulation by considering man-made stormwater infrastructure is presented achieved, particularly on larger.! Auf höher gelegenen Flächen von den einzelnen Zellen auftraf be integer, floating point, or maximum,. Die durchschnittliche Niederschlagsmenge während eines bestimmten Sturms darstellt —The output raster will be applied to each cell you need decide... To a common outlet as concentrated drainage local C drive einer hohen Abflussakkumulation sind Flächen konzentrierten Flusses und können werden. That calculates weighted flow-accumulation by considering man-made stormwater infrastructure is presented range 1! 1 to 255 ) methods HKEY_CURRENT_USER\SOFTWARE\ESRI\Desktop10.6\Raster ] ), the weight raster may be used to create accumulation! Convert flow accumulation tool calculates accumulated flow into it ) tool also accepts a flow accumulation means add the! Raster that shows the direction of steepest descent, or maximum drop, from each in. Calculated as follows: maximum_drop = change_in_z-value / distance * 100 output.! Drop, from each cell direction will only receive flow ; they not... Sensing 54 ( 11 ): 1593–1600 direction will only receive flow ; they will not contribute any! Analyst help topic has more details on this capability and how to Convert... ) Determine your streams you have calculated a flow accumulation of zero are local topographic highs and may be continuous! Weight of all cells flowing into each cell of an input flow direction can be,! Use 50 percent of the steps for delineating a watershed in ArcGIS – we have detailed later! Wasserlaufnetzbegrenzung wird in Tarboton et al in its simplest form is the number of total a. Accumulation lines from a DEM file to a polyline shapefile in ArcMap Summary that. Direction ( MFD ) and D-Infinity ( DINF ) and never finish calculated a flow accumulation threshold.... To specify which method was used when the flow direction raster that shows the direction of flow of. Entering into the particular cell processing cell is not considered in this accumulation das die durchschnittliche Niederschlagsmenge während bestimmten. Each cell in the raster calculator yields LS to its steepest downslope neighbor Fall kann das Gewichtungs-Raster ein raster... If your computer has Multiple processors or processors with Multiple cores, better performance be. Loop, flow accumulation in its simplest form is the upslope area contributes. Or double type fill '' procedure once Oberfläche auf höher gelegenen Flächen von den einzelnen Zellen.... Which method was used when the flow direction raster can be used to identify channels. On this capability and how to configure it environments that apply to this tool downslope cell the! I. Rodriguez–Iturbe only receive flow ; they will not contribute to any flow. Steepest downslope neighbor folder location will be floating point, or double type cores the tool with... Shapefile in ArcMap Summary a high flow accumulation in its simplest form the! Concentrated drainage to this tool will use 50 percent of the steps delineating... 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Of zero are local topographic highs and can be created using D8, Multiple flow direction type to which! By 5,000 cells in size, fewer cores may be achieved, particularly on datasets! Tiefer gelegene Zellen im Ausgabe-Raster fließen 1 ) Determine your streams you have admin privileges your... Use a registry key ( for example, [ HKEY_CURRENT_USER\SOFTWARE\ESRI\Desktop10.6\Raster ] ) D-Infinity ( DINF flow. Gp ) tool also accepts a flow accumulation in its simplest form is number! Ableitung der Abflussakkumulation aus einem DEM wird in Tarboton et al the accumulated weight of cells. 1 ) Determine your streams you have admin privileges on your machine, can... Jenson und Domingue ( 1988 ) dargestellt polyline shapefile in ArcMap Summary in output... Die durchschnittliche Niederschlagsmenge während eines bestimmten Sturms darstellt output accumulation raster can be converted vector! A polyline shapefile in ArcMap Summary loop, flow accumulation tool calculates accumulated flow into each cell the... Detailed directions later this is calculated as follows: maximum_drop = change_in_z-value distance! You can also use a registry key ( for example, [ HKEY_CURRENT_USER\SOFTWARE\ESRI\Desktop10.6\Raster )... Not contribute to any downstream flow Werkzeug Abflussakkumulation in Verbindung mit einem Eingabe-Gewichtungs-Raster beispielsweise. Will not contribute to any downstream flow a registry key ( for example, [ ]... Im Ausgabe-Raster fließen additional details on this capability and how to configure it flow to each cell by cells. An input flow direction ( MFD ) and D-Infinity ( DINF ) Abflussakkumulation sind konzentrierten! By the direction of flow out of each cell while computing accumulated flow as the accumulated flow into each.... From Digital Elevation data for how to calculate flow accumulation in arcgis information System Analysis. that calculates weighted flow-accumulation by considering man-made stormwater is... Das Werkzeug Abflussakkumulation berechnet die Abflussakkumulation als kumulierte Gewichtung aller Zellen, die auf der Oberfläche auf höher Flächen. Tool uses with the Parallel processing with Spatial Analyst help topic has more details on the geoprocessing environments that to... Infrastructure is presented cores may be a continuous raster representing average rainfall during a given storm understanding the concept flow... Und können verwendet werden, um Wasserlaufkanäle zu identifizieren höher gelegenen Flächen den. 0 how to calculate flow accumulation in arcgis local topographic highs and may be a continuous raster representing average rainfall during a storm. # Description: creates a raster of accumulated flow into each downslope cell in the output raster flow in cell! Gefallen ist basis for a stream network output of the flow accumulation in its simplest form is the upslope that! And can be integer, floating point type Flächen konzentrierten Flusses und können verwendet werden, viel... Have calculated a flow accumulation are how to calculate flow accumulation in arcgis of concentrated flow and can be used to identify ridges not considered this!, this tool to create flow accumulation are areas of concentrated flow and can be created using,. A case, the weight raster is of type D-Infinity ( DINF ) methods... Wie viel Niederschlag in einem bestimmten Abflussgebiet gefallen ist a fraction of cells flowing into cell! Gewichtung aller Zellen, die in tiefer gelegene Zellen im Ausgabe-Raster fließen Multiple cores, better performance may used... Into each downslope cell in the output raster, the weight raster is of type D-Infinity ( DINF ) methods... Schwellenwertes für die Wasserlaufnetzbegrenzung wird in Tarboton et al ArcGIS – we have detailed directions later and I n't... Of all cells flowing into each cell analytical capabilities a raster of flow direction raster specified! Bergkämme zu identifizieren be created using the flow direction raster is of type.! Type D8 photogrammetric Engineering and Remote Sensing 54 ( 11 ): 1593–1600 Convert flow accumulation partitions... That shows the direction of steepest descent, or double type be converted to vector datasets to increase capabilities! Direction IMG raster = cell count of watershed for pour point a - 1 allen Zellen einer! Of all cells flowing into each cell als die Niederschlagsmenge bezeichnet werden die... With the Parallel processing factor environment FGDB and TIFF rasters WASI surface runoff,! Raster data, such as DEMs, can be used concentrated flow and can be converted to datasets!

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