Impact of cloud cover on local remote sensing – Piaśnica River case study Cover

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Impact of cloud cover on local remote sensing – Piaśnica River case study

Oceanological and Hydrobiological Studies

Volume 51 (2022): Issue 3 (September 2022)

By: Marcin Paszkuta

Open Access

|Nov 2022

Figures & Tables

The River Piaśnica mouth: (a) Satellite view (source: googlemaps - Copernicus). (b) At the beach level (http://www.debki.pl). (c) Situation map of the area presented (blue square). (d) Mouth length with Sentinel-2/MSI data. (e) Distribution of the mouth lengths analysed, for environmental comparisons.

An example of data supplied by the Sentinel-3/OLCI of 2020.01.05 9:24 UTC for the southern Baltic Sea: (a) RGB - Composites True Color (for Sentinel-3/OLCI channels: 4 blue, 6 green, 8 red – see Table 2). (b) a systemic cloud cover mask supplied with data (S3B_OL_2_LFR/OTCI/LQSF_CLOUD); (c) Situation map of the area presented.

A Sentinel-2/MSI image of the Gulf of Gdańsk of 2020.01.01 10:03 UTC: (a) RGB - Composites True Color (for Sentinel-2/MSI channels: 2 blue, 3 green, 4 red – see Table 1). (b) Opaque cloud cover mask. (c) Cirrus cloud cover mask; supplied with the systemic data. (d) Situation map of the area presented.

A relationship between Copernicus data-based cloud cover over the Piaśnica site: (a) Cloud cover estimated in a supervised manner (by a trained observer) with Sentinel-2/MSI data. (b) Unsupervised estimation (Paszkuta 2019) with Sentinel-3/OLCI data.

Field research: (a) MFR-7 radiometer for measurements including atmospheric state. (b) Comparison of results with satellite estimates.

Variability in the Piaśnica mouth length at the fixed beach section in 2017, resulting from supervised and systemic cloud cover estimation.

Annual changes of the Piaśnica mouth length in relation to: (a) The sea level. (b) Dry beach parameter (data source: SatBaltic). (c) The relation of sea level to the dry beach width.

Annual changes in the Piaśnica mouth length in relation to: (a) Wind direction. (b) Current speed (data source: SatBaltic).

Annual changes in cloud cover on selected maps of the study site in the Piaśnica mouth area in relation to water turbidity index.

The data base used for comparisons_ The cloud cover estimates for supervised (Sup) and systemic (Sys) observations in % of test site surface area_

No.	Date	Sup	Sys	No.	Date	Sup	Sys
1	2017-01-01T10:04:12	77	85	25	2017-07-23 T10:10:31	39	56
2	2017-01-11T10:03:51	5.2	7.7	26	2017-08-02 T10:10:31	19	25
3	2017-01-24T10:13:11	35	59	27	2017-08-09 T10:00:31	23	29
4	2017-01-31T10:02:31	3.1	5.7	28	2017-08-17 T10:10:19	2.1	1.2
5	2017-02-10T10:01:31	12	15	29	2017-08-24 T10:00:19	0.1	4.6
6	2017-02-03T10:12:21	80	90	30	2017-09-01 T10:10:21	23	46
7	2017-02-23T10:10:21	72	79	31	2017-09-08 T10:00:31	36	56
8	2017-03-12T10:00:21	40	49	32	2017-09-16 T10:10:19	17	17
9	2017-03-15T10:10:21	5.1	9.7	33	2017-09-26 T10:10:09	37	44
10	2017-03-22T10:00:21	0	0	34	2017-10-01 T10:10:21	0	0
11	2017-04-01T10:00:21	4.8	6.6	35	2017-10-08 T10:00:31	18	16
12	2017-04-11T10:00:31	32	44	36	2017-10-16 T10:10:09	1	1.7
13	2017-04-14T10:10:21	12	22	37	2017-10-18 T10:00:31	49	42
14	2017-05-01T10:00:31	0	0.5	38	2017-10-23 T10:00:39	74	92
15	2017-05-11T10:00:31	29	47	39	2017-10-31 T10:11:41	67	87
16	2017-05-14T10:10:31	23	35	40	2017-11-05 T10:11:59	1.5	4.6
17	2017-05-21T10:00:31	35	37	41	2017-11-07 T10:02:21	2.5	3.4
18	2017-05-24T10:10:31	8.4	11	42	2017-11-15 T10:12:49	19	17
19	2017-06-03T10:10:31	11	10	43	2017-11-17 T10:03:01	61	86
20	2017-06-13T10:10:31	51	65	44	2017-12-02 T10:03:49	1.5	2.7
21	2017-06-20T10:00:31	15	35	45	2017-12-10 T10:14:11	10	12
22	2017-07-03T10:10:21	39	48	46	2017-12-17 T10:04:11	31	34
23	2017-07-10T10:00:31	20	26	47	2017-12-22 T10:04:19	58	60
24	2017-07-15T10:00:29	0.5	1.6	48	2017-12-30 T10:14:21	0	0

Spectral channels of Sentinel-3/OLCI

Channel No.	S3 OLCI
Channel No.	Central wavelength (nm)	Bandwidth (nm)
1	400	15
2	412.5	10
3	442.5	10
4	490	10
5	510	10
6	560	10
7	620	10
8	665	10
9	673.72	7.5
10	681.25	7.5
11	708.75	10
12	753.75	7.2
13	761.25	2.5
14	764.375	3.75
15	767.5	2.5
16	778.75	15
17	865	20
18	885	10
19	900	10
20	940	20
21	1020	40

Results of comparison cloud cover estimation, simplified to binary information, with data supplied by the Copernicus Sentinel-2/MSI and Sentinel-3/OLCI_

	Agreement (%)	Disagreement (%)
Copernicus Sentinel-2/MSI	96	4
Copernicus Sentinel-3/OLCI	92	8

Spectral channels of Sentinel-2/MSI (Multispectral Instrument)

Band No.	S2A MSI		S2B MSI		Spatial resolution (m)
Band No.	Central wavelength (nm)	Bandwidth (nm)	Central wavelength (nm)	Bandwidth (nm)	Spatial resolution (m)
1	442.7	21	442.2	21	60
2	492.4	66	492.1	66	10
3	559.8	36	559.0	36	10
4	664.6	31	664.9	31	10
5	704.1	15	703.8	16	20
6	740.5	15	739.1	15	20
7	782.8	20	779.7	20	20
8	832.8	106	832.9	106	10
8a	864.7	21	864.0	22	20
9	945.1	20	943.2	21	60
10	1373.5	31	1376.9	30	60
11	1613.7	91	1610.4	94	20
12	2202.4	175	2185.7	185	20

DOI: https://doi.org/10.26881/oahs-2022.3.04 | Journal eISSN: 1897-3191 | Journal ISSN: 1730-413X

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Language: English

Page range: 283 - 297

Submitted on: May 6, 2022

Accepted on: Sep 13, 2022

Published on: Nov 7, 2022

Published by: University of Gdańsk

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

remote sensing,

coastal morphology,

coastal zone satellite observations

Related subjects:

Chemistry, other,

Geosciences, other,

Life sciences, other

© 2022 Marcin Paszkuta, published by University of Gdańsk
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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