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Flow Accumulation Tool ArcGIS
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Flow Accumulation Tool, Hydrology Toolset, Spatial Analyst ArcToolbox
Summary
Creates a raster of accumulated flow into each cell. A weight factor can optionally be applied.
Usage
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.
The Flow Accumulation tool supports three flow modeling algorithms while computing accumulated flow. These are D8, Multiple Flow Direction (MFD) and D-Infinity (DINF) flow methods.
If the input flow direction raster is not created with the Flow Direction tool, there is a chance that the defined flow could loop. If the flow direction contains a loop, Flow Accumulation will go into an endless cycle and never finish.
Input flow direction can be created using the D8, Multiple Flow Direction (MFD) or D-Infinity (DINF) methods. The type of input flow direction raster between these three influences how the Flow Accumulation tool partitions and accumulates flow in each cell. Use the Input flow direction type to specify which method was used when the flow direction raster was created.
Cells of undefined flow direction will only receive flow; they will not contribute to any downstream flow.
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.
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.
The accumulated flow is based on the number of total or a fraction of cells flowing into each cell in the output raster. The current processing cell is not considered in this accumulation.
Output cells with a high flow accumulation are areas of concentrated flow and can be used to identify stream channels.
Output cells with a flow accumulation of zero are local topographic highs and can be used to identify ridges.
The Flow Accumulation tool does not honour the Compression environment setting. The output raster will always be uncompressed.
This tool supports parallel processing. If your computer has multiple processors or processors with multiple cores, better performance may be achieved, particularly on larger datasets. The Parallel processing with Spatial Analyst help topic has more details on this capability and how to configure it.
When using parallel processing, temporary data will be written to manage the data chunks being processed. The default temp folder location will be on your local C drive. 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). 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]).
By default, this tool will use 50 percent of the available cores. If the input data is smaller than 5,000 by 5,000 cells in size, fewer cores may be used. You can control the number of cores the tool uses with the Parallel processing factor environment.
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موقع لكل مهتم في مجال نظم المعلومات الجغرافية GIS من هنا:
احترف التعامل مع البيانات الجغرافية من خلال برامج ArcGIS:
تعلم اساسيات إنشاء قواعد البيانات الجغرافية من هنا:
اليك صفحه ومجموعة على الفيس بوك لتعلم أكثر بما يخص نظم المعلومات الجغرافية (GIS) و برامج ArcGIS من خلال هذه الروابط:
مجموعة على الفيس بوك ArcGIS :
مجموعة على الفيس بوك GIS for WE - ArcGIS:
صفحة الفيس بوك GIS for WE:
رابط فيديو مقدمة تعلم على برامج ArcGIS بثلاثة مراحل :
#ArcGIS
#Analysis_GIS
#Data_Analysis
اعداد وتقديم المطور والباحث في مجال نظم المعلومات الجغرافية حسام جعبه
رام الله - فلسطين.
#GISforWE
GIS for World of E-Learning
Summary
Creates a raster of accumulated flow into each cell. A weight factor can optionally be applied.
Usage
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.
The Flow Accumulation tool supports three flow modeling algorithms while computing accumulated flow. These are D8, Multiple Flow Direction (MFD) and D-Infinity (DINF) flow methods.
If the input flow direction raster is not created with the Flow Direction tool, there is a chance that the defined flow could loop. If the flow direction contains a loop, Flow Accumulation will go into an endless cycle and never finish.
Input flow direction can be created using the D8, Multiple Flow Direction (MFD) or D-Infinity (DINF) methods. The type of input flow direction raster between these three influences how the Flow Accumulation tool partitions and accumulates flow in each cell. Use the Input flow direction type to specify which method was used when the flow direction raster was created.
Cells of undefined flow direction will only receive flow; they will not contribute to any downstream flow.
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.
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.
The accumulated flow is based on the number of total or a fraction of cells flowing into each cell in the output raster. The current processing cell is not considered in this accumulation.
Output cells with a high flow accumulation are areas of concentrated flow and can be used to identify stream channels.
Output cells with a flow accumulation of zero are local topographic highs and can be used to identify ridges.
The Flow Accumulation tool does not honour the Compression environment setting. The output raster will always be uncompressed.
This tool supports parallel processing. If your computer has multiple processors or processors with multiple cores, better performance may be achieved, particularly on larger datasets. The Parallel processing with Spatial Analyst help topic has more details on this capability and how to configure it.
When using parallel processing, temporary data will be written to manage the data chunks being processed. The default temp folder location will be on your local C drive. 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). 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]).
By default, this tool will use 50 percent of the available cores. If the input data is smaller than 5,000 by 5,000 cells in size, fewer cores may be used. You can control the number of cores the tool uses with the Parallel processing factor environment.
flow accumulation ,accumulation ,flow accumulation arcgis ,flow accumulation map ,flow accumulation in gis ,flow accumulation in qgis ,hydrology tools ,concept of flow accumulation ,understanding flow accumulation ,flow direction and flow accumulation ,direction and accumulation ,flow accumulation and stream order map in gis ,spatial analyst tools ,flow accumulat ,arcgis hydrology tools tutorial ,how to find flow accumulation in gis from raster data of elevation ?
شرح الأداة :
لمتابعة موقع GISforWE من هنا:
موقع لكل مهتم في مجال نظم المعلومات الجغرافية GIS من هنا:
احترف التعامل مع البيانات الجغرافية من خلال برامج ArcGIS:
تعلم اساسيات إنشاء قواعد البيانات الجغرافية من هنا:
اليك صفحه ومجموعة على الفيس بوك لتعلم أكثر بما يخص نظم المعلومات الجغرافية (GIS) و برامج ArcGIS من خلال هذه الروابط:
مجموعة على الفيس بوك ArcGIS :
مجموعة على الفيس بوك GIS for WE - ArcGIS:
صفحة الفيس بوك GIS for WE:
رابط فيديو مقدمة تعلم على برامج ArcGIS بثلاثة مراحل :
#ArcGIS
#Analysis_GIS
#Data_Analysis
اعداد وتقديم المطور والباحث في مجال نظم المعلومات الجغرافية حسام جعبه
رام الله - فلسطين.
#GISforWE
GIS for World of E-Learning