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Service Description: The Topographic Wetness Index (TWI) is a steady-state wetness index that attempts to quantify the water movement on landforms and landscapes. The conventional Topographic Wetness Index is created in a Geographic Information Systems and defined as ln(a/tan β), the logarithm of the area divided by the tangent of the local slope. The conventional TWI is an index that correlates water movement on similar sloped landforms that have the same TWI index value. It is an interpretation of USGS digital elevation model (DEM) slope, and the upstream area used in its analysis. Any estimate of water accumulation is based on the finite areas determined within the calculation area. Slope and upstream surface area are the only two derivatives used in defining TWI. TWI performs best on sloping uplands but deteriorates in flat landscapes.
Purpose: The TWI is a valuable index for understanding the relationship between topography and hydrology before making a field visit. It can help identify areas that are prone to water accumulation and can be used to assess the potential for wetland development. However, the standard TWI has design limitations that has been overcome with the development of the Climate Enhanced Topographic Wetness Index.
Creation Date: 20240507
Publication Date: 20240507
Revision Date:
Refresh Cycle: Updated periodically as new imagery becomes available
Version: 1.0.0
Change Log: Service Deployed
Report Service Errors
cetwi/cetwi_twi_2022_10m
Description: The Topographic Wetness Index (TWI) is a steady-state wetness index that attempts to quantify the water movement on landforms and landscapes. The conventional Topographic Wetness Index is created in a Geographic Information Systems and defined as ln(a/tan β), the logarithm of the area divided by the tangent of the local slope. The conventional TWI is an index that correlates water movement on similar sloped landforms that have the same TWI index value. It is an interpretation of USGS digital elevation model (DEM) slope, and the upstream area used in its analysis. Any estimate of water accumulation is based on the finite areas determined within the calculation area. Slope and upstream surface area are the only two derivatives used in defining TWI. TWI performs best on sloping uplands but deteriorates in flat landscapes.
Purpose: The TWI is a valuable index for understanding the relationship between topography and hydrology before making a field visit. It can help identify areas that are prone to water accumulation and can be used to assess the potential for wetland development. However, the standard TWI has design limitations that has been overcome with the development of the Climate Enhanced Topographic Wetness Index.
Creation Date: 20240507
Publication Date: 20240507
Revision Date:
Refresh Cycle: Updated periodically as new imagery becomes available
Version: 1.0.0
Change Log: Service Deployed
Report Service Errors
false
Extent:
XMin: -1.41369485894E7
YMin: 2970825.0378575586
XMax: -1.002522920423133E7
YMax: 6388034.489299999
Spatial Reference: 102100
(3857)
Initial Extent:
XMin: -1.41369485894E7
YMin: 2970825.0378575586
XMax: -1.002522920423133E7
YMax: 6388034.489299999
Spatial Reference: 102100
(3857)
Full Extent:
XMin: -1.41369485894E7
YMin: 2970825.0378575586
XMax: -1.002522920423133E7
YMax: 6388034.489299999
Spatial Reference: 102100
(3857)
Pixel Size X: 10.307360251205587
Pixel Size Y: 10.307360251205589
Band Count: 1
Pixel Type: S16
RasterFunction Infos: {"rasterFunctionInfos": [
{
"name": "cetwi_rangeland",
"description": "The Climate-Enhanced Topographic Wetness Index (CETWI) is a climate and terrain driven deterministic model using a suite of derivatives to estimate effective soil surface moisture from precipitation and inflow across a continuous earth surface.The CETWI value, scaled with zero beginning the lowest potential for moisture to accumulate to higher values being the highest potential for moisture to accumulate",
"help": ""
},
{
"name": "None",
"description": "",
"help": ""
}
]}
Mensuration Capabilities: Basic
Has Histograms: true
Has Colormap: false
Has Multi Dimensions : false
Rendering Rule:
Min Scale: 0
Max Scale: 0
Copyright Text: CETWI TWI Imagery Service provided by USDA-FPAC
Service Data Type: esriImageServiceDataTypeGeneric
Min Values: -317
Max Values: 8328
Mean Values: 552.7501878996062
Standard Deviation Values: 348.8649673192581
Object ID Field: OBJECTID
Fields:
-
OBJECTID
(
type: esriFieldTypeOID, alias: OBJECTID
)
-
Shape
(
type: esriFieldTypeGeometry, alias: Shape
)
-
Name
(
type: esriFieldTypeString, alias: Name, length: 200
)
-
Category
(
type: esriFieldTypeInteger, alias: Category
, Coded Values:
[0: Unknown]
, [1: Primary]
, [2: Overview]
, ...6 more...
)
-
GroupName
(
type: esriFieldTypeString, alias: GroupName, length: 100
)
-
CenterX
(
type: esriFieldTypeDouble, alias: CenterX
)
-
CenterY
(
type: esriFieldTypeDouble, alias: CenterY
)
-
Shape_Length
(
type: esriFieldTypeDouble, alias: Shape_Length
)
-
Shape_Area
(
type: esriFieldTypeDouble, alias: Shape_Area
)
Default Mosaic Method: Northwest
Allowed Mosaic Methods: NorthWest,Center,LockRaster,ByAttribute,Nadir,Viewpoint,Seamline,None
SortField:
SortValue: null
Mosaic Operator: First
Default Compression Quality: 75
Default Resampling Method: Bilinear
Max Record Count: 1000
Max Image Height: 4100
Max Image Width: 15000
Max Download Image Count: 20
Max Mosaic Image Count: 20
Allow Raster Function: true
Allow Copy: true
Allow Analysis: true
Allow Compute TiePoints: false
Supports Statistics: true
Supports Advanced Queries: true
Use StandardizedQueries: true
Raster Type Infos:
Name: Raster Dataset
Description: Supports all ArcGIS Raster Datasets
Help:
Has Raster Attribute Table: false
Edit Fields Info: null
Ownership Based AccessControl For Rasters: null
Child Resources:
Info
Histograms
Statistics
Key Properties
Legend
Raster Function Infos
Supported Operations:
Export Image
Query
Identify
Measure
Compute Histograms
Compute Statistics Histograms
Get Samples
Compute Class Statistics
Query Boundary
Compute Pixel Location
Validate
Project