Methodology · EroTrack
How shoreline change is measured
EroTrack shows where the Ghana shoreline has moved, measured as the distance along fixed transects at each survey date.
transects
sites
years
Data
The tool draws satellite-derived shoreline positions published by the ISEMAC-G partner, the same package as the partner's shoreline viewer. The positions cover a set of sites and transects along the Ghana coast.
Transects and positions
A transect is a fixed line across the shore. Each survey date gives the shoreline's distance along it. The tool shows one position per year: the mean of that year's surveys.
Rate of change
Each transect carries a rate of change in metres per year, taken from the package. A positive rate is accretion, the shore growing seaward; a negative rate is erosion. The rate falls into one of six classes.
- Strong accretion
- > +3 m/yr
- Accretion
- +1 to +3 m/yr
- Slight accretion
- +0 to +1 m/yr
- Slight erosion
- -1 to 0 m/yr
- Erosion
- -3 to -1 m/yr
- Severe erosion
- < -3 m/yr
Years shown
The tool shows 2016–2023, one stop per year. A year with no survey on a transect is drawn faded.
Limitations
This is a model preview and has not been calibrated against field measurements. Coverage is Ghana only.