Sky camera geometric calibration using solar observations

Urquhart, Bryan; Kurtz, Ben; Kleissl, Jan

doi:https://doi.org/10.5194/amt-9-4279-2016

Articles | Volume 9, issue 9

https://doi.org/10.5194/amt-9-4279-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/amt-9-4279-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 9, issue 9

Research article

|

05 Sep 2016

Research article |

| 05 Sep 2016

Sky camera geometric calibration using solar observations

Bryan Urquhart, Ben Kurtz, and Jan Kleissl

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Total article views: 3,843 (including HTML, PDF, and XML)

HTML	PDF	XML	Total	BibTeX	EndNote
1,942	1,795	106	3,843	152	154

HTML: 1,942
PDF: 1,795
XML: 106
Total: 3,843
BibTeX: 152
EndNote: 154

Views and downloads (calculated since 15 Jan 2016)

Month	HTML	PDF	XML	Total
Jan 2016	81	36	2	119
Feb 2016	23	13	0	36
Mar 2016	13	14	1	28
Apr 2016	14	50	1	65
May 2016	9	55	3	67
Jun 2016	7	32	1	40
Jul 2016	5	3	2	10
Aug 2016	9	0	9
Sep 2016	69	27	4	100
Oct 2016	14	7	0	21
Nov 2016	7	6	0	13
Dec 2016	3	1	0	4
Jan 2017	8	4	0	12
Feb 2017	10	20	0	30
Mar 2017	17	27	2	46
Apr 2017	20	28	2	50
May 2017	30	32	0	62
Jun 2017	15	18	0	33
Jul 2017	8	14	0	22
Aug 2017	10	16	2	28
Sep 2017	10	12	0	22
Oct 2017	5	10	0	15
Nov 2017	7	14	0	21
Dec 2017	9	16	0	25
Jan 2018	7	10	0	17
Feb 2018	5	10	0	15
Mar 2018	17	12	0	29
Apr 2018	9	7	1	17
May 2018	16	10	0	26
Jun 2018	9	8	0	17
Jul 2018	7	12	0	19
Aug 2018	13	7	0	20
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Oct 2018	9	12	0	21
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Dec 2018	12	9	0	21
Jan 2019	3	8	0	11
Feb 2019	3	6	0	9
Mar 2019	12	17	3	32
Apr 2019	6	12	0	18
May 2019	12	16	1	29
Jun 2019	10	19	0	29
Jul 2019	8	10	0	18
Aug 2019	7	10	0	17
Sep 2019	5	7	0	12
Oct 2019	12	21	2	35
Nov 2019	7	11	0	18
Dec 2019	7	15	0	22
Jan 2020	7	22	1	30
Feb 2020	9	16	0	25
Mar 2020	5	17	0	22
Apr 2020	5	13	0	18
May 2020	7	9	0	16
Jun 2020	9	10	0	19
Jul 2020	29	20	5	54
Aug 2020	10	17	4	31
Sep 2020	11	10	0	21
Oct 2020	11	18	1	30
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Jan 2021	23	19	0	42
Feb 2021	14	22	1	37
Mar 2021	11	11	0	22
Apr 2021	9	20	1	30
May 2021	11	15	1	27
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Nov 2021	14	35	0	49
Dec 2021	12	9	0	21
Jan 2022	10	13	0	23
Feb 2022	7	8	1	16
Mar 2022	19	20	1	40
Apr 2022	15	19	1	35
May 2022	8	12	1	21
Jun 2022	9	11	1	21
Jul 2022	10	17	0	27
Aug 2022	12	7	0	19
Sep 2022	6	9	1	16
Oct 2022	7	6	1	14
Nov 2022	6	12	0	18
Dec 2022	11	9	1	21
Jan 2023	9	14	1	24
Feb 2023	16	15	2	33
Mar 2023	27	12	0	39
Apr 2023	6	7	1	14
May 2023	53	22	1	76
Jun 2023	54	24	2	80
Jul 2023	42	6	1	49
Aug 2023	48	15	4	67
Sep 2023	38	16	1	55
Oct 2023	41	15	2	58
Nov 2023	20	9	0	29
Dec 2023	49	5	1	55
Jan 2024	41	15	0	56
Feb 2024	29	12	0	41
Mar 2024	41	21	4	66
Apr 2024	43	13	4	60
May 2024	13	16	5	34
Jun 2024	51	13	2	66
Jul 2024	17	5	3	25
Aug 2024	20	5	1	26
Sep 2024	8	11	0	19
Oct 2024	15	23	0	38
Nov 2024	3	12	1	16
Dec 2024	9	9	2	20
Jan 2025	10	19	4	33
Feb 2025	22	11	2	35
Mar 2025	22	16	0	38
Apr 2025	15	20	0	35
May 2025	17	20	2	39
Jun 2025	38	17	1	56
Jul 2025	32	14	3	49
Aug 2025	23	20	1	44
Sep 2025	45	36	2	83
Oct 2025	19	26	1	46
Nov 2025	2	6	0	8

Cumulative views and downloads (calculated since 15 Jan 2016)

Month	HTML	PDF	XML	Total
Jan 2016	81	36	2	119
Feb 2016	23	13	0	36
Mar 2016	13	14	1	28
Apr 2016	14	50	1	65
May 2016	9	55	3	67
Jun 2016	7	32	1	40
Jul 2016	5	3	2	10
Aug 2016	9	0	9
Sep 2016	69	27	4	100
Oct 2016	14	7	0	21
Nov 2016	7	6	0	13
Dec 2016	3	1	0	4
Jan 2017	8	4	0	12
Feb 2017	10	20	0	30
Mar 2017	17	27	2	46
Apr 2017	20	28	2	50
May 2017	30	32	0	62
Jun 2017	15	18	0	33
Jul 2017	8	14	0	22
Aug 2017	10	16	2	28
Sep 2017	10	12	0	22
Oct 2017	5	10	0	15
Nov 2017	7	14	0	21
Dec 2017	9	16	0	25
Jan 2018	7	10	0	17
Feb 2018	5	10	0	15
Mar 2018	17	12	0	29
Apr 2018	9	7	1	17
May 2018	16	10	0	26
Jun 2018	9	8	0	17
Jul 2018	7	12	0	19
Aug 2018	13	7	0	20
Sep 2018	10	9	0	19
Oct 2018	9	12	0	21
Nov 2018	8	8	0	16
Dec 2018	12	9	0	21
Jan 2019	3	8	0	11
Feb 2019	3	6	0	9
Mar 2019	12	17	3	32
Apr 2019	6	12	0	18
May 2019	12	16	1	29
Jun 2019	10	19	0	29
Jul 2019	8	10	0	18
Aug 2019	7	10	0	17
Sep 2019	5	7	0	12
Oct 2019	12	21	2	35
Nov 2019	7	11	0	18
Dec 2019	7	15	0	22
Jan 2020	7	22	1	30
Feb 2020	9	16	0	25
Mar 2020	5	17	0	22
Apr 2020	5	13	0	18
May 2020	7	9	0	16
Jun 2020	9	10	0	19
Jul 2020	29	20	5	54
Aug 2020	10	17	4	31
Sep 2020	11	10	0	21
Oct 2020	11	18	1	30
Nov 2020	8	8	0	16
Dec 2020	14	10	0	24
Jan 2021	23	19	0	42
Feb 2021	14	22	1	37
Mar 2021	11	11	0	22
Apr 2021	9	20	1	30
May 2021	11	15	1	27
Jun 2021	8	15	0	23
Jul 2021	7	15	0	22
Aug 2021	13	17	1	31
Sep 2021	9	12	1	22
Oct 2021	11	51	1	63
Nov 2021	14	35	0	49
Dec 2021	12	9	0	21
Jan 2022	10	13	0	23
Feb 2022	7	8	1	16
Mar 2022	19	20	1	40
Apr 2022	15	19	1	35
May 2022	8	12	1	21
Jun 2022	9	11	1	21
Jul 2022	10	17	0	27
Aug 2022	12	7	0	19
Sep 2022	6	9	1	16
Oct 2022	7	6	1	14
Nov 2022	6	12	0	18
Dec 2022	11	9	1	21
Jan 2023	9	14	1	24
Feb 2023	16	15	2	33
Mar 2023	27	12	0	39
Apr 2023	6	7	1	14
May 2023	53	22	1	76
Jun 2023	54	24	2	80
Jul 2023	42	6	1	49
Aug 2023	48	15	4	67
Sep 2023	38	16	1	55
Oct 2023	41	15	2	58
Nov 2023	20	9	0	29
Dec 2023	49	5	1	55
Jan 2024	41	15	0	56
Feb 2024	29	12	0	41
Mar 2024	41	21	4	66
Apr 2024	43	13	4	60
May 2024	13	16	5	34
Jun 2024	51	13	2	66
Jul 2024	17	5	3	25
Aug 2024	20	5	1	26
Sep 2024	8	11	0	19
Oct 2024	15	23	0	38
Nov 2024	3	12	1	16
Dec 2024	9	9	2	20
Jan 2025	10	19	4	33
Feb 2025	22	11	2	35
Mar 2025	22	16	0	38
Apr 2025	15	20	0	35
May 2025	17	20	2	39
Jun 2025	38	17	1	56
Jul 2025	32	14	3	49
Aug 2025	23	20	1	44
Sep 2025	45	36	2	83
Oct 2025	19	26	1	46
Nov 2025	2	6	0	8

Latest update: 07 Nov 2025

Short summary

A model relating the position of objects in the 3-D world to their pixel coordinates has been developed for a fixed-focal length fisheye lens camera. An associated automated method to calibrate model parameters has been developed for a daytime skyward-pointing camera. The position of the sun throughout the day is used as input to the calibration algorithm. The accuracy of the calibration was found to be on the same order as the accuracy of sun position detection in an image.