Abstract
The abundance of marine macro-debris was quantified with high spatial resolution by applying an image processing technique to archived shoreline aerial photographs taken over Vancouver Island, Canada. The photographs taken from an airplane at oblique angles were processed by projective transformation for georeferencing, where five reference points were defined by comparing aerial photographs with satellite images of Google Earth. Thereafter, pixels of marine debris were extracted based on their color differences from the background beaches. The debris abundance can be evaluated by the ratio of an area covered by marine debris to that of the beach (percent cover). The horizontal distribution of percent cover of marine debris was successfully computed from 167 aerial photographs and was significantly related to offshore Ekman flows and winds (leeway drift and Stokes drift). Therefore, the estimated percent cover is useful information to determine priority sites for mitigating adverse impacts across broad areas.
| Original language | English |
|---|---|
| Pages (from-to) | 44-51 |
| Number of pages | 8 |
| Journal | Marine Pollution Bulletin |
| Volume | 132 |
| DOIs | |
| Publication status | Published - Jul 2018 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Oceanography
- Aquatic Science
- Pollution
Cite this
Quantification of marine macro-debris abundance around Vancouver Island, Canada, based on archived aerial photographs processed by projective transformation. / Kataoka, Tomoya; Murray, Cathryn Clarke; Isobe, Atsuhiko.
In: Marine Pollution Bulletin, Vol. 132, 07.2018, p. 44-51.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Quantification of marine macro-debris abundance around Vancouver Island, Canada, based on archived aerial photographs processed by projective transformation
AU - Kataoka, Tomoya
AU - Murray, Cathryn Clarke
AU - Isobe, Atsuhiko
PY - 2018/7
Y1 - 2018/7
N2 - The abundance of marine macro-debris was quantified with high spatial resolution by applying an image processing technique to archived shoreline aerial photographs taken over Vancouver Island, Canada. The photographs taken from an airplane at oblique angles were processed by projective transformation for georeferencing, where five reference points were defined by comparing aerial photographs with satellite images of Google Earth. Thereafter, pixels of marine debris were extracted based on their color differences from the background beaches. The debris abundance can be evaluated by the ratio of an area covered by marine debris to that of the beach (percent cover). The horizontal distribution of percent cover of marine debris was successfully computed from 167 aerial photographs and was significantly related to offshore Ekman flows and winds (leeway drift and Stokes drift). Therefore, the estimated percent cover is useful information to determine priority sites for mitigating adverse impacts across broad areas.
AB - The abundance of marine macro-debris was quantified with high spatial resolution by applying an image processing technique to archived shoreline aerial photographs taken over Vancouver Island, Canada. The photographs taken from an airplane at oblique angles were processed by projective transformation for georeferencing, where five reference points were defined by comparing aerial photographs with satellite images of Google Earth. Thereafter, pixels of marine debris were extracted based on their color differences from the background beaches. The debris abundance can be evaluated by the ratio of an area covered by marine debris to that of the beach (percent cover). The horizontal distribution of percent cover of marine debris was successfully computed from 167 aerial photographs and was significantly related to offshore Ekman flows and winds (leeway drift and Stokes drift). Therefore, the estimated percent cover is useful information to determine priority sites for mitigating adverse impacts across broad areas.
UR - http://www.scopus.com/inward/record.url?scp=85029222435&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85029222435&partnerID=8YFLogxK
U2 - 10.1016/j.marpolbul.2017.08.060
DO - 10.1016/j.marpolbul.2017.08.060
M3 - Article
C2 - 28916350
AN - SCOPUS:85029222435
VL - 132
SP - 44
EP - 51
JO - Marine Pollution Bulletin
JF - Marine Pollution Bulletin
SN - 0025-326X
ER -