Add Profile Attributes Low

This tool add a number of profile attributes to the input feature class. This tool requires the LengthWidthRatio attribute to be calculated first using either the Add Shape Attributes Low Add Shape Attribute Low Fast Tool.

For each bathymetric low feature, if its area is larger than a user-defined threshold, five cross-section profiles perpendicular to the orientation of the feature, with an equal distance-interval are generated; otherwise only one cross-section profile perpendicular to the orientation of the feature is generated.

The following attributes are calculated to describe the cross-section profile(s). Note that a complex cross-section is simplified by identifying and linking knick points. The start and end points of a cross-section profile are always selected as knick points.

  1. profieShape: Describe the shape of the cross-section profile

    • Flat: when the profile or simplified profile has only two knick points (start and end)

    • Triangle: when the profile or simplified profile has three knick points

    • Irregular: when the profile or simplified profile has more than three knick points and the profile is concave in the profileConcavity attribute

    • Regular: when the profile or simplified profile has more than three knick points and the profile is convex in the profileConcavity attribute

  2. profileSymmetry: Describe the symmetry of the cross-section profile

    • Symmetric: when the profile’s skewness is < 0.2

    • Asymmetic: when the profile’s skewness is >= 0.2

    • NA: when the profileShape attribute is Flat

  3. profileConcavity: Describe the concavity of the cross-section profile

    • Concave: when the polygon formed by the knick points of the profile or simplified profile has an angle > 180°

    • Convex: when the polygon formed by the knick points of the profile or simplified profile does not have any angles > 180°

    • NA: when the proileShape attribute is Flat

  4. profile_bottom_SlopeClass: Describe the category of the slope-gradient of the bottom of the profile or simplified profile, which is calculated as the mean of the slope-gradients of all of the profile’s non-side segments

    • Flat: slope-gradient < 5

    • Gentle: slope-gradient 5-10

    • Moderate: slope-gradient 10-30

    • Steep: slope-gradient > 30

    • no bottom: when the profileShape attribute is Triangle

    • NA: when the profileShape attribute is Flat

  5. profile_side_SlopeClass: Describe the category of the slope-gradient of side of the profile or simplified profile, which is calculated as the weighted average of the slope-gradients of the two profile’s side segments. The weights are the inverse distances (segment lengths).

    • Flat: slope gradient < 5

    • Gentle: slope gradient 5-10

    • Moderate: slope gradient 10-30

    • Steep: slope gradient > 30

    • NA: when the profileShape attribute is Flat

  6. profile_bottom_Depth: Describe the water depth of the bottom of the profile or simplified profile, which is calculated at the deepest of the profile’s knick points

  7. profileRelief: Describe the topographic relief of the profile or simplified profile, which is calculated as the depth range between the shallowest and the deepest of the profile’s knick points

  8. profileLength: Describe the length of the profile or simplified profile, which is calculated as the distance between the start point and end point of the profile

_images/profile_attributes1.png 
 1from arcpy import env
 2from arcpy.sa import *
 3arcpy.CheckOutExtension("Spatial")
 4
 5# import the python toolbox
 6arcpy.ImportToolbox("C:/semi_automation_tools/User_Guide/Tools/AddAttributes.pyt")
 7
 8env.workspace = 'C:/semi_automation_tools/testSampleCode/Gifford.gdb'
 9env.overwriteOutput = True
10
11# specify input and output parameters of the tool
12inFeat = 'test_BL'
13inBathy = 'gifford_bathy'
14areaT = '20000 SquareMeters'
15tempFolder = 'C:/semi_automation_tools/temp4'
16# execute the tool
17arcpy.AddAttributes.Add_Profile_Attributes_Low_Tool(inFeat,inBathy,areaT,tempFolder)