Site Report: nzd0001

Location: Northland, New Zealand / Aotearoa

Site Statistics

This dataset contains 33 transects associated with the shoreline at site nzd0001 . Each transect represents a segment of the coastline for which elevation and positional data have been analysed to estimate shoreline change trends and related metrics. The orientation of transects spans from 313.059 ° to 359.037 °, with a mean orientation of 333.134 °, indicating the general alignment of shoreline segments within this site.

In terms of shoreline change:

  • The average linear trend across all transects is -0.009 m/year, with individual values ranging from -0.403 to 0.541 , suggesting a net erosional trend overall.

  • The Root Mean Square Error (RMSE) of the trend model averages 15.21 m, indicating the typical deviation between observed points and the fitted trend line.

Confidence intervals on shoreline position trends are also available:

  • The mean lower bound is 0.068 , and the mean upper bound is 0.11 , reflecting the uncertainty range around trend estimates.

The number of valid data points per transect ( n_points_nonan ) ranges from 150 to 185 , with an average of 176.636 .

Site Zone Analysis

Site Zone Configuration

No areas of interest (AOIs) were identified for this site. This may be due to the min_zone_length ( ) parameter being set too high, or the transect data not meeting the criteria for any defined zones.

This site has been divided in to 4 zones consisting of at minimum 3 transects each. To increase or decrease the sensitivity of the zone definitions (i.e. the number of transects required to define a zone), you can adjust the min_zone_length parameter in the run_narrative_zoning function call above. Zone definitions are customisable, and extensible, and can be modified and extended by editing the aoi_definitions dictionary in the run_narrative_zoning function call above. Zone definitions applied to this site can be found in section Area of Interest Definitions at the bottom of this report.

Zone:

This zone spans km and contains transects, from to .

The figure below show the time series of shoreline position for the transects in this zone.

The figures below show the R² and RMSE metrics for the transects in this zone, which indicate high uncertainty in trend analysis. The R² score (top plot) measures the proportion of variance in the data explained by the model, with values closer to 1 indicating better fit. The sporadic nature of the R² values could be related to seasonal changes, data gaps, or other factors affecting the transects in this zone. The RMSE (bottom plot) quantifies the average deviation of observed values from the model predictions, with lower values indicating better accuracy.

No analysis available for this zone type.

Limitations of interface.crate modeling mean that SAR time serries data is not available for this site type.

The figure below show the time series of shoreline position for the transects in this zone.

The figures below show the R² and RMSE metrics for the transects in this zone, which indicate high uncertainty in trend analysis. The R² score (top plot) measures the proportion of variance in the data explained by the model, with values closer to 1 indicating better fit. The sporadic nature of the R² values could be related to seasonal changes, data gaps, or other factors affecting the transects in this zone. The RMSE (bottom plot) quantifies the average deviation of observed values from the model predictions, with lower values indicating better accuracy.

No analysis available for this zone type.

Table 1 Zone Metrics

Metric Value
Length km
Mean Trend m/year
Beach Slope
R² Score

Table 2 Zone Quality Metrics

Metric Value
RMSE m
MAE m
Confidence Interval [ , ]
Orientation °

Transect Summary

Zone: Moderate Erosion

This zone spans 0.3 km and contains 4 transects, from nzd0001-0003 to nzd0001-0006 . Erosion zone showing consistent retreat averaging 0.4m/year. Ongoing erosion processes are evident.

The figure below show the time series of shoreline position for the transects in this zone.

The figures below show the R² and RMSE metrics for the transects in this zone, which indicate high uncertainty in trend analysis. The R² score (top plot) measures the proportion of variance in the data explained by the model, with values closer to 1 indicating better fit. The sporadic nature of the R² values could be related to seasonal changes, data gaps, or other factors affecting the transects in this zone. The RMSE (bottom plot) quantifies the average deviation of observed values from the model predictions, with lower values indicating better accuracy.

No analysis available for this zone type.

Limitations of interface.crate modeling mean that SAR time serries data is not available for this site type.

The figure below show the time series of shoreline position for the transects in this zone.

The figures below show the R² and RMSE metrics for the transects in this zone, which indicate high uncertainty in trend analysis. The R² score (top plot) measures the proportion of variance in the data explained by the model, with values closer to 1 indicating better fit. The sporadic nature of the R² values could be related to seasonal changes, data gaps, or other factors affecting the transects in this zone. The RMSE (bottom plot) quantifies the average deviation of observed values from the model predictions, with lower values indicating better accuracy.

No analysis available for this zone type.

Table 3 nzd0001_Moderate Erosion_zone_02 Zone Metrics

Metric Value
Length 0.3 km
Mean Trend -0.38 m/year
Beach Slope 0.06
R² Score 0.0343

Table 4 nzd0001_Moderate Erosion_zone_02 Zone Quality Metrics

Metric Value
RMSE 15.74 m
MAE 12.69 m
Confidence Interval [ 0.051 , 0.0738 ]
Orientation 358.2 °

Transect Summary

Zone: Moderate Accretion

This zone spans 0.5 km and contains 6 transects, from nzd0001-0026 to nzd0001-0031 . Stable accretion zone with gradual beach building averaging 0.4m/year. Positive sediment balance is maintained.

The figure below show the time series of shoreline position for the transects in this zone.

The figures below show the R² and RMSE metrics for the transects in this zone, which indicate high uncertainty in trend analysis. The R² score (top plot) measures the proportion of variance in the data explained by the model, with values closer to 1 indicating better fit. The sporadic nature of the R² values could be related to seasonal changes, data gaps, or other factors affecting the transects in this zone. The RMSE (bottom plot) quantifies the average deviation of observed values from the model predictions, with lower values indicating better accuracy.

No analysis available for this zone type.

Limitations of interface.crate modeling mean that SAR time serries data is not available for this site type.

The figure below show the time series of shoreline position for the transects in this zone.

The figures below show the R² and RMSE metrics for the transects in this zone, which indicate high uncertainty in trend analysis. The R² score (top plot) measures the proportion of variance in the data explained by the model, with values closer to 1 indicating better fit. The sporadic nature of the R² values could be related to seasonal changes, data gaps, or other factors affecting the transects in this zone. The RMSE (bottom plot) quantifies the average deviation of observed values from the model predictions, with lower values indicating better accuracy.

No analysis available for this zone type.

Table 5 nzd0001_Moderate Accretion_zone_04 Zone Metrics

Metric Value
Length 0.5 km
Mean Trend 0.42 m/year
Beach Slope 0.1125
R² Score 0.0284

Table 6 nzd0001_Moderate Accretion_zone_04 Zone Quality Metrics

Metric Value
RMSE 18.99 m
MAE 14.79 m
Confidence Interval [ 0.0799 , 0.1648 ]
Orientation 315.8 °

Transect Summary

Zone: High Uncertainty

This zone spans 0.2 km and contains 3 transects, from nzd0001-0000 to nzd0001-0002 . Data-limited zone where shoreline trends are difficult to determine reliably. Additional monitoring may be needed.

The figure below show the time series of shoreline position for the transects in this zone.

The figures below show the R² and RMSE metrics for the transects in this zone, which indicate high uncertainty in trend analysis. The R² score (top plot) measures the proportion of variance in the data explained by the model, with values closer to 1 indicating better fit. The sporadic nature of the R² values could be related to seasonal changes, data gaps, or other factors affecting the transects in this zone. The RMSE (bottom plot) quantifies the average deviation of observed values from the model predictions, with lower values indicating better accuracy.

No analysis available for this zone type.

Limitations of interface.crate modeling mean that SAR time serries data is not available for this site type.

The figure below show the time series of shoreline position for the transects in this zone.

The figures below show the R² and RMSE metrics for the transects in this zone, which indicate high uncertainty in trend analysis. The R² score (top plot) measures the proportion of variance in the data explained by the model, with values closer to 1 indicating better fit. The sporadic nature of the R² values could be related to seasonal changes, data gaps, or other factors affecting the transects in this zone. The RMSE (bottom plot) quantifies the average deviation of observed values from the model predictions, with lower values indicating better accuracy.

No analysis available for this zone type.

Table 7 nzd0001_High Uncertainty_zone_01 Zone Metrics

Metric Value
Length 0.2 km
Mean Trend -0.17 m/year
Beach Slope 0.055
R² Score 0.0061

Table 8 nzd0001_High Uncertainty_zone_01 Zone Quality Metrics

Metric Value
RMSE 21.7 m
MAE 17.65 m
Confidence Interval [ 0.0437 , 0.0728 ]
Orientation 359 °

Transect Summary

Zone: High Uncertainty

This zone spans 1.8 km and contains 19 transects, from nzd0001-0007 to nzd0001-0025 . Data-limited zone where shoreline trends are difficult to determine reliably. Additional monitoring may be needed.

The figure below show the time series of shoreline position for the transects in this zone.

The figures below show the R² and RMSE metrics for the transects in this zone, which indicate high uncertainty in trend analysis. The R² score (top plot) measures the proportion of variance in the data explained by the model, with values closer to 1 indicating better fit. The sporadic nature of the R² values could be related to seasonal changes, data gaps, or other factors affecting the transects in this zone. The RMSE (bottom plot) quantifies the average deviation of observed values from the model predictions, with lower values indicating better accuracy.

No analysis available for this zone type.

Limitations of interface.crate modeling mean that SAR time serries data is not available for this site type.

The figure below show the time series of shoreline position for the transects in this zone.

The figures below show the R² and RMSE metrics for the transects in this zone, which indicate high uncertainty in trend analysis. The R² score (top plot) measures the proportion of variance in the data explained by the model, with values closer to 1 indicating better fit. The sporadic nature of the R² values could be related to seasonal changes, data gaps, or other factors affecting the transects in this zone. The RMSE (bottom plot) quantifies the average deviation of observed values from the model predictions, with lower values indicating better accuracy.

No analysis available for this zone type.

Table 9 nzd0001_High Uncertainty_zone_03 Zone Metrics

Metric Value
Length 1.8 km
Mean Trend -0.06 m/year
Beach Slope 0.0808
R² Score 0.0076

Table 10 nzd0001_High Uncertainty_zone_03 Zone Quality Metrics

Metric Value
RMSE 12.63 m
MAE 9.83 m
Confidence Interval [ 0.0684 , 0.0977 ]
Orientation 330.3 °

Transect Summary

No areas of interest (AOIs) were found for the site.

Narrative Generation Configuration

Area of Interest Definitions

The area of interest (AOI) definitions are used to categorise shoreline segments based on their trends and characteristics. Each AOI has a priority, conditions for classification, and a description template for narrative generation. This report returns zones with, at minimum, 3 transects.

AOI Name Priority Conditions
No Data 1 If the `trend` of the intersect is null.
Rapid Erosion 2 If the `trend` of the intersect is less than -0.8.
Moderate Erosion 3 If the `trend` of the intersect is less than -0.3.
Rapid Accretion 4 If the `trend` of the intersect is greater than 0.8.
Moderate Accretion 5 If the `trend` of the intersect is greater than 0.3.
High Uncertainty 6 If the `r2_score` of the intersect is less than 0.05. If the `rmse` of the intersect is greater than 30.
Steep Beach 7 If the `beach_slope` of the intersect is greater than 0.08.
Low Energy 8 If the `beach_slope` of the intersect is less than 0.04.
Stable 9 –

LivePublication Data

This publication is part of the CoastSat project, which aims to monitor coastal change using satellite imagery. It is based on this version of the interface.crate , and this version of the CoastSat GitHub repository.

Shoreline publication.crate