OR/14/015 South-west Deeps (West) - Revision history

Ajhil: /* Spatial predictions */

2022-05-04T09:48:21Z

Spatial predictions

← Older revision		Revision as of 10:48, 4 May 2022
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	==Spatial predictions==		==Spatial predictions==
	Spatial predictions were carried out as described for the Swallow Sand MCZ ~~in section 2.3~~. The output files are SWDW_predictions.dat with the conditional expectations of gravel, sand and mud content and associated measures of uncertainty (same structure as described in Table 5 for the comparable file from Swallow Sand) and SWDW_classes.dat, with the EUNIS class probabilities (same structure as described in Table 6 for the comparable file from Swallow Sand).		Spatial predictions were carried out as described for the Swallow Sand MCZ ([[OR/14/015 Swallow Sand#Spatial predictions\|''see'' Spatial predictions]]). The output files are SWDW_predictions.dat with the conditional expectations of gravel, sand and mud content and associated measures of uncertainty (same structure as described in Table 5 for the comparable file from Swallow Sand) and SWDW_classes.dat, with the EUNIS class probabilities (same structure as described in Table 6 for the comparable file from Swallow Sand).

	Figure 7 below shows the conditional expectation of gravel, sand and mud across the SWDW MCZ, and Figure 8 shows the 0.025 and 0.975 quantile which define a 95% confidence interval for mud content.		Figure 7 below shows the conditional expectation of gravel, sand and mud across the SWDW MCZ, and Figure 8 shows the 0.025 and 0.975 quantile which define a 95% confidence interval for mud content.

Ajhil: /* Exploratory data analysis and transformation */

2022-05-04T09:47:19Z

Exploratory data analysis and transformation

← Older revision		Revision as of 10:47, 4 May 2022
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	===Exploratory data analysis and transformation===		===Exploratory data analysis and transformation===
	Exploratory statistics of the 208 particle size data are shown in Table 7 below. Eight zero values were recorded for gravel content and 2 for mud content. Non-zero values were imputed as for the Swallow Sand data, following Lark et al. (2012)<ref name="Lark 2012">LARK, R M, DOVE, D, GREEN, S, RICHARDSON, A E, STEWART, H, and STEVENSON, A. 2012. Spatial prediction of seabed sediment texture classes by cokriging from a legacy database of point observations. ''Sedimentary Geology'', Vol. 281, 35–49. </ref>. Table 8 shows summary statistics of the alr-transformed data		Exploratory statistics of the 208 particle size data are shown in Table 7 below. Eight zero values were recorded for gravel content and 2 for mud content. Non-zero values were imputed as for the Swallow Sand data, following Lark et al. (2012)<ref name="Lark 2012">LARK, R M, DOVE, D, GREEN, S, RICHARDSON, A E, STEWART, H, and STEVENSON, A. 2012. Spatial prediction of seabed sediment texture classes by cokriging from a legacy database of point observations. ''Sedimentary Geology'', Vol. 281, 35–49. </ref>. Table 8 shows summary statistics of the alr-transformed data.

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Ajhil: /* Data */

2022-05-04T09:47:02Z

Data

← Older revision		Revision as of 10:47, 4 May 2022
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	{{OR/14/015}}		{{OR/14/015}}
	==Data==		==Data==
	The data used for the South-west Deeps (West) MCZ (SWDW) are particle size analyses from the verification survey carried out by Cefas in 2013 (McIlwaine, 2013<ref name="McIlwaine">MCILWAINE, P. 2013 South-West Deeps (West) recommended Marine Conservation Zone (rMCZ) Survey Report: C5785H. Issue date: 24 July 2013.</ref>). The data were collected by 0.1 m<sup>2</sup> Hamon grab from 208 locations on a pre-planned survey grid. Exploratory analysis found no duplicate locations in this data set. This is a sizeable data set to support a spatial analysis, so as described for Swallow Sand in ([[OR/14/015 Swallow Sand# Data\|''see'' Data]]) above, no attempt was made to supplement these data with others from the BGS archive.		The data used for the South-west Deeps (West) MCZ (SWDW) are particle size analyses from the verification survey carried out by Cefas in 2013 (McIlwaine, 2013<ref name="McIlwaine">MCILWAINE, P. 2013 South-West Deeps (West) recommended Marine Conservation Zone (rMCZ) Survey Report: C5785H. Issue date: 24 July 2013.</ref>). The data were collected by 0.1 m<sup>2</sup> Hamon grab from 208 locations on a pre-planned survey grid. Exploratory analysis found no duplicate locations in this data set. This is a sizeable data set to support a spatial analysis, so as described for Swallow Sand ([[OR/14/015 Swallow Sand# Data\|''see'' Data]]) above, no attempt was made to supplement these data with others from the BGS archive.

	===Exploratory data analysis and transformation===		===Exploratory data analysis and transformation===

Ajhil: /* Data */

2022-05-04T09:46:39Z

Data

← Older revision		Revision as of 10:46, 4 May 2022
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	{{OR/14/015}}		{{OR/14/015}}
	==Data==		==Data==
	The data used for the South-west Deeps (West) MCZ (SWDW) are particle size analyses from the verification survey carried out by Cefas in 2013 (McIlwaine, 2013<ref name="McIlwaine">MCILWAINE, P. 2013 South-West Deeps (West) recommended Marine Conservation Zone (rMCZ) Survey Report: C5785H. Issue date: 24 July 2013.</ref>). The data were collected by 0.1 m<sup>2</sup> Hamon grab from 208 locations on a pre-planned survey grid. Exploratory analysis found no duplicate locations in this data set. This is a sizeable data set to support a spatial analysis, so as described for Swallow Sand in ([[OR/14/015 Swallow ~~sand~~# Data\|''see'' Data]]) above, no attempt was made to supplement these data with others from the BGS archive.		The data used for the South-west Deeps (West) MCZ (SWDW) are particle size analyses from the verification survey carried out by Cefas in 2013 (McIlwaine, 2013<ref name="McIlwaine">MCILWAINE, P. 2013 South-West Deeps (West) recommended Marine Conservation Zone (rMCZ) Survey Report: C5785H. Issue date: 24 July 2013.</ref>). The data were collected by 0.1 m<sup>2</sup> Hamon grab from 208 locations on a pre-planned survey grid. Exploratory analysis found no duplicate locations in this data set. This is a sizeable data set to support a spatial analysis, so as described for Swallow Sand in ([[OR/14/015 Swallow Sand# Data\|''see'' Data]]) above, no attempt was made to supplement these data with others from the BGS archive.

	===Exploratory data analysis and transformation===		===Exploratory data analysis and transformation===

Ajhil: /* Data */

2022-05-04T09:44:51Z

Data

← Older revision		Revision as of 10:44, 4 May 2022
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	{{OR/14/015}}		{{OR/14/015}}
	==Data==		==Data==
	The data used for the South-west Deeps (West) MCZ (SWDW) are particle size analyses from the verification survey carried out by Cefas in 2013 (McIlwaine, 2013<ref name="McIlwaine">MCILWAINE, P. 2013 South-West Deeps (West) recommended Marine Conservation Zone (rMCZ) Survey Report: C5785H. Issue date: 24 July 2013. </ref>). The data were collected by 0.1 m<sup>2</sup> Hamon grab from 208 locations on a pre-planned survey grid. Exploratory analysis found no duplicate locations in this data set. This is a sizeable data set to support a spatial analysis, so as described for Swallow Sand in ~~section 2.1~~ above, no attempt was made to supplement these data with others from the BGS archive.		The data used for the South-west Deeps (West) MCZ (SWDW) are particle size analyses from the verification survey carried out by Cefas in 2013 (McIlwaine, 2013<ref name="McIlwaine">MCILWAINE, P. 2013 South-West Deeps (West) recommended Marine Conservation Zone (rMCZ) Survey Report: C5785H. Issue date: 24 July 2013.</ref>). The data were collected by 0.1 m<sup>2</sup> Hamon grab from 208 locations on a pre-planned survey grid. Exploratory analysis found no duplicate locations in this data set. This is a sizeable data set to support a spatial analysis, so as described for Swallow Sand in ([[OR/14/015 Swallow sand# Data\|''see'' Data]]) above, no attempt was made to supplement these data with others from the BGS archive.

	===Exploratory data analysis and transformation===		===Exploratory data analysis and transformation===

Ajhil at 09:30, 4 May 2022

2022-05-04T09:30:51Z

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	==Spatial analysis==		==Spatial analysis==
	The same procedures used with the Swallow Sand data were used to compute estimates of the auto- and cross variograms, and to fit LMCRs to the data for SWDW, and these are shown in Figure 6.		The same procedures used with the Swallow Sand data were used to compute estimates of the auto- and cross variograms, and to fit LMCRs to the data for SWDW, and these are shown in Figure 6.
	~~{{clear}}~~
	[[Image:~~14015 fig6~~.jpg\|thumb\|center\|~~500px~~\|'''Figure 6'''    Estimated variograms and cross-variograms with fitted linear model of coregionalizations for alr-mud and alr-sand for SWSW. Solid symbols are method of moment estimates with fitted model in red. Open symbols are mimimum volume ellipsoid estimates with fitted model in blue.]]		[[Image:OR14015fig6.jpg\|thumb\|center\|400px\|'''Figure 6'''    Estimated variograms and cross-variograms with fitted linear model of coregionalizations for alr-mud and alr-sand for SWSW. Solid symbols are method of moment estimates with fitted model in red. Open symbols are mimimum volume ellipsoid estimates with fitted model in blue.]]
	~~{{clear}}~~
	Cross-validation results for the two sets of auto-variograms are presented in Table 9.		Cross-validation results for the two sets of auto-variograms are presented in Table 9.

Ajhil: /* Spatial predictions */

2022-05-04T09:19:20Z

Spatial predictions

← Older revision		Revision as of 10:19, 4 May 2022
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	[[Image:OR14015fig9.jpg\|thumb\|center\|400px\|'''Figure 9'''    Most probable EUNIS class (top) across the SWDW MCZ and probability of the most probable class (bottom).]]		[[Image:OR14015fig9.jpg\|thumb\|center\|400px\|'''Figure 9'''    Most probable EUNIS class (top) across the SWDW MCZ and probability of the most probable class (bottom).]]

	[[Image:~~14015 fig10~~.jpg\|thumb\|~~left~~\|~~500px~~\|'''Figure 10''' Probability of finding each EUNIS class (top) across the SWDW MCZ.]]		[[Image:OR14015fig10.jpg\|thumb\|center\|400px\|'''Figure 10'''    Probability of finding each EUNIS class (top) across the SWDW MCZ.]]
	~~{{clear}}~~
	As at Swallow Sand, class Sand and Muddy Sand is delineated as most probable across most of the SWDW MCZ. Uncertainty is greatest in central eastern parts of the zone, including areas where classes Mixed and Coarse have largest probability. While there is significant nugget variance in the LMCR for SWDW, there is stronger spatial dependence than at Swallow Sand. The mapped conditional expectations show local patches where the gravel content of the sediment is larger than average, and a general reduction in sand content of the sediment from south-west to north-east.		As at Swallow Sand, class Sand and Muddy Sand is delineated as most probable across most of the SWDW MCZ. Uncertainty is greatest in central eastern parts of the zone, including areas where classes Mixed and Coarse have largest probability. While there is significant nugget variance in the LMCR for SWDW, there is stronger spatial dependence than at Swallow Sand. The mapped conditional expectations show local patches where the gravel content of the sediment is larger than average, and a general reduction in sand content of the sediment from south-west to north-east.

Ajhil: /* Spatial predictions */

2022-05-04T09:18:34Z

Spatial predictions

← Older revision		Revision as of 10:18, 4 May 2022
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	Figure 7 below shows the conditional expectation of gravel, sand and mud across the SWDW MCZ, and Figure 8 shows the 0.025 and 0.975 quantile which define a 95% confidence interval for mud content.		Figure 7 below shows the conditional expectation of gravel, sand and mud across the SWDW MCZ, and Figure 8 shows the 0.025 and 0.975 quantile which define a 95% confidence interval for mud content.

	[[Image:~~14015 fig7~~.jpg\|thumb\|center\|~~500px~~\|'''Figure 7''' Conditional Expectation of gravel, sand and mud content (proportions) across the SWDW MCZ based on multiple realizations of the prediction distribution.]]		[[Image:OR14015fig7.jpg\|thumb\|center\|400px\|'''Figure 7'''    Conditional Expectation of gravel, sand and mud content (proportions) across the SWDW MCZ based on multiple realizations of the prediction distribution.]]

	[[Image:OR14015fig8.jpg\|thumb\|center\|~~500px~~\|'''Figure 8'''    Upper (top) and lower (bottom) bounds of the 95% confidence interval for mud content (proportion) across the SWDW MCZ based on multiple realizations of the prediction distribution.]]		[[Image:OR14015fig8.jpg\|thumb\|center\|400px\|'''Figure 8'''    Upper (top) and lower (bottom) bounds of the 95% confidence interval for mud content (proportion) across the SWDW MCZ based on multiple realizations of the prediction distribution.]]

	Figure 9 below shows the most probable EUNIS class across the Swallow Sand MCZ, and the probability of the most probable class. Figure 10 shows the probability of each class.		Figure 9 below shows the most probable EUNIS class across the Swallow Sand MCZ, and the probability of the most probable class. Figure 10 shows the probability of each class.

	[[Image:OR14015fig9.jpg\|thumb\|center\|~~500px~~\|'''Figure 9'''    Most probable EUNIS class (top) across the SWDW MCZ and probability of the most probable class (bottom).]]		[[Image:OR14015fig9.jpg\|thumb\|center\|400px\|'''Figure 9'''    Most probable EUNIS class (top) across the SWDW MCZ and probability of the most probable class (bottom).]]

	[[Image:14015 fig10.jpg\|thumb\|left\|500px\|'''Figure 10''' Probability of finding each EUNIS class (top) across the SWDW MCZ.]]		[[Image:14015 fig10.jpg\|thumb\|left\|500px\|'''Figure 10''' Probability of finding each EUNIS class (top) across the SWDW MCZ.]]

Ajhil: /* Spatial predictions */

2022-05-04T09:17:44Z

Spatial predictions

← Older revision		Revision as of 10:17, 4 May 2022
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	Figure 7 below shows the conditional expectation of gravel, sand and mud across the SWDW MCZ, and Figure 8 shows the 0.025 and 0.975 quantile which define a 95% confidence interval for mud content.		Figure 7 below shows the conditional expectation of gravel, sand and mud across the SWDW MCZ, and Figure 8 shows the 0.025 and 0.975 quantile which define a 95% confidence interval for mud content.

	[[Image:14015 fig7.jpg\|thumb\|~~left~~\|500px\|'''Figure 7''' Conditional Expectation of gravel, sand and mud content (proportions) across the SWDW MCZ based on multiple realizations of the prediction distribution.]]		[[Image:14015 fig7.jpg\|thumb\|center\|500px\|'''Figure 7''' Conditional Expectation of gravel, sand and mud content (proportions) across the SWDW MCZ based on multiple realizations of the prediction distribution.]]

	[[Image:OR14015fig8.jpg\|thumb\|center\|500px\|'''Figure 8'''    Upper (top) and lower (bottom) bounds of the 95% confidence interval for mud content (proportion) across the SWDW MCZ based on multiple realizations of the prediction distribution.]]		[[Image:OR14015fig8.jpg\|thumb\|center\|500px\|'''Figure 8'''    Upper (top) and lower (bottom) bounds of the 95% confidence interval for mud content (proportion) across the SWDW MCZ based on multiple realizations of the prediction distribution.]]

Ajhil: /* Spatial predictions */

2022-05-04T09:17:21Z

Spatial predictions

← Older revision		Revision as of 10:17, 4 May 2022
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	Figure 7 below shows the conditional expectation of gravel, sand and mud across the SWDW MCZ, and Figure 8 shows the 0.025 and 0.975 quantile which define a 95% confidence interval for mud content.		Figure 7 below shows the conditional expectation of gravel, sand and mud across the SWDW MCZ, and Figure 8 shows the 0.025 and 0.975 quantile which define a 95% confidence interval for mud content.
	~~{{Clear}~~
	[[Image:14015 fig7.jpg\|thumb\|left\|500px\|'''Figure 7''' Conditional Expectation of gravel, sand and mud content (proportions) across the SWDW MCZ based on multiple realizations of the prediction distribution.]]		[[Image:14015 fig7.jpg\|thumb\|left\|500px\|'''Figure 7''' Conditional Expectation of gravel, sand and mud content (proportions) across the SWDW MCZ based on multiple realizations of the prediction distribution.]]