PEN

Phenological Eyes Network (PEN)

These datasets are long-term continuous phenological and sky images taken by time-lapse cameras through the Phenological Eyes Network in various ecosystems from the Arctic region.
Phenological images are useful in recording the year-to-year variability in the timing of flowering, leaf-flush, leaf-coloring, and leaf-fall and detecting the characteristics of phenological patterns and timing sensitivity among species and ecosystems. They can also help interpret variations in carbon, water, and heat cycling in terrestrial ecosystems, and be used to obtain ground-truth data for the validation of satellite-observed products.
These images provide (1) long-term, continuous detailed records of plant phenology that are more quantitative than in situ visual phenological observations of index trees; (2) basic information to explain the responsiveness, vulnerability, and resilience of ecosystem canopies and their functions and services to changes in climate; and (3) ground-truthing for the validation of satellite remote-sensing observations.
ADFC(Automatic-capturing Digital Fisheye Camera)
ADFC is a combination of a high-quality digital camera (Nikon CoolPix series), a fish-eye lens (Nikon FC-E8), a water-proof housing case, and a control system with a personal computer. It captures images of the sky, the canopy from above and below, the forest floor, and shoots of typical species with short intervals (2 minutes to 24 hours, depending on the target). These images provide information about cloud condition at the satellite's observation, vegetation phenology, snow pack, tree cover, and LAI.
Site IDCamera IDLINKLocation (height; AGL)Direction of viewTargetLensStart dateEnd dateFrequency (period; local time)Missing period
PFAy17_dLINKTop of tower (17m)DownwardsForest canopyFish-eye lens2011/3/19Working30 - 180 min (06:00 - 18:30)2011/11/4-2011/12/18,
2013/7/19-2013/8/18,
2013/10/5-2013/12/31,
2014/1/1-2014/1/2,
2014/9/6-2014/9/24,
2015/6/28-2015/8/16,
2015/9/30-2015/12/31,
2016/1/1-2016/2/10,
2016/8/21-2016/9/8,
2016/11/19-2016/12/18,
2016/12/28-2016/12/31,
2017/1/1-2017/3/23,
2017/6/11-2017/6/28,
2017/6/30-2017/7/12,
2017/7/24-2017/8/2,
2017/10/11-2017/11/15
y02_dLINKForest floor (2 m)DownwardsUnderstory vegetationStandard lens2015/8/18Working30 min (06:00_18:30) (24h in 2015)2015/11/30-2015/12/31,
2016/1/1-2016/2/22,
2016/10/17-2016/12/31,
2017/1/1-2017/3/23
f02_uLINKForest floor (2 m)UpwardsForest canopyFish-eye lens2011/3/19Working15 min (06:00_18:45)2011/6/1-2011/6/15,
2011/11/4-2011/12/18,
2013/7/19-2013/8/12,
2013/10/5-2013/12/31,
2014/1/1-2014/1/2,
2014/9/6-2014/9/24,
2015/6/28-2015/8/16,
2015/9/30-2015/12/31,
2016/1/1-2016/2/22,
2016/8/21-2016/9/23,
2016/11/19-2016/12/18,
2016/12/28-2016/12/31,
2017/1/1-2017/3/23,
2017/7/24-2017/8/2
SSPy32_dLINKTop of tower (32m)DownwardsForest canopyFish-eye lens2013/6/102017/6/2460 min (02:00 - 23:00)2013/9/20-2013/10/1,
2014/1/6-2014/4/10,
2014/10/27-2014/12/31,
2015/12/23-2015/12/31,
2016/1/1-2016/4/14,
2016/8/9-2016/8/29,
2017/1/5-2017/2/1,
2017/2/11-2017/3/4,
2017/3/30-2017/4/9,
2017/5/24-2017/6/9
y03_dLINKBottom of tower (3m)DownwardsCanopy of shrub treesFish-eye lens2013/6/92017/6/2260 min (02:00 - 23:00)2013/6/25-2013/8/5,
2013/11/15-2013/12/31,
2014/1/1-2014/4/10,
2014/4/16-2014/4/28,
2014/5/7-2014/7/11,
2014/8/23-2014/10/17,
2014/10/27-2014/12/31,
2015/1/1-2015/6/27,
2015/7/14-2015/8/24,
2015/9/17-2015/12/31,
2016/1/1-2016/4/14,
2016/6/16-2016/7/1,
2016/7/22-2016/8/2,
2016/8/9-2016/8/29,
2016/11/19-2016/12/31,
2017/1/1-2017/2/1,
2017/2/11-2017/3/4,
2017/3/30-2017/4/9,
2017/4/24-2017/5/21,
2017/5/24-2017/6/9
y02_uLINKForest floor (2m)UpwardsForest canopyFish-eye lens2013/8/6Working60 min (02:00 - 23:00)2013/10/2-2013/12/31,
2014/1/1-2014/4/28,
2014/5/7-2014/7/25,
2014/8/23-2014/10/17,
2014/10/27-2014/12/31,
2015/1/1-2015/4/29,
2015/7/14-2015/8/24,
2015/9/17-2015/12/31,
2016/1/1-2016/5/29,
2016/6/16-2016/7/1,
2016/7/22-2016/8/2,
2016/8/9-2016/8/29,
2016/9/14-2016/9/29,
2016/11/19-2016/12/7,
2017/1/5-2017/2/1,
2017/2/11-2017/3/4,
2017/3/30-2017/4/9,
2017/4/24-2017/5/4,
2017/5/24-2017/6/10
UAKf01_uLINKForest floor (1m)UpwardsForest canopyFish-eye lens2010/7/72013/10/2415 min (06:00 - 21:45)2010/11/2-2010/12/31,
2011/1/1-2011/3/17,
2011/11/1-2011/12/31,
2012/1/1-2012/3/7,
2012/9/23-2012/12/31,
2013/1/1-2013/3/21,
2013/7/27-2013/8/5,
2013/8/16-2013/9/2