Topographic Change
Topographic Change
Introduction:
This assignment focuses on topographic change detection looking specifically at the River Feshie in Scotland.
Using both the Geomorphic Change Detection Software and Arc GIS Pro, we are able to determine how much and what type of change is occurring across specific time periods. In this case we are looking at detecting change over the period of a year.
Photo credit: Joe Wheaton
Budget Segregation
Source: Riverscapes Consortium
Topographic Change Detection was found using the Geomorphic Change Detection Software and then loaded into Arc GIS Pro in order to visual the change on a map.
I chose to look at the change in the River Feshie from 2004 to 2005.
Red areas represent degradation, this is either:
Bank Erosion
Channel Bed Lowering
Blue areas represent aggradation, this is either:
Bar Development
Channel Bed Rising
In order to determine how much degradation or aggradation occurred between 2004 and 2005, I created a budget segregation shapefile and labeled reaches accordingly.
This was determined both visually by looking at the different DEM's from 2004 and 2005 as well as the change detection calculated for this time period.
Using the Budget Segregation shapefile created in Arc GIS Pro I was able to utilize the budget segregation tool in the GCD software.
Source: Riverscapes Consortium
This analysis was done at a probalistic 0.80 confidence level.
Based on this budget segregation, we are able to determine that most of the change that occurred from 2004 to 2005 was in the form of Channel Bed Lowering and Channel Bed Raising.
This table represents the overall results of the 2004-2005 budget segregation analysis run in the GCD Software.
This reflects:
That 89.47% of our area of interest reflected detectable change.
There was a 78.36% total net volume difference between 2004 and 2005.
Degradation
Channel Bed Lowering
Volume
While GCD does have graphical outputs for area, I chose not to display them due to how minimally these results are reflected.
Bank Erosion
Volume
Aggradation
Channel Bed Rising
Volume
Bar Development
Volume