| 2 | Operational continental-scale land cover mapping of Australia using the Open Data Cube显示文摘To comprehensively support national and international initiatives for sustainable development,land cover products need to be reliably and routinely generated within operational frameworks.Coupled with consistent semantics and taxonomies,ensuring confidence in mapping land cover for multiple time periods,facilitates informed decision-making at scales appropriate to multiple policy domains.The United Nations Food and Agriculture Organisation(FAO)Land Cover Classification System(LCCS)provides a taxonomy that comparable at different scales,level of detail and geographic location.The Open Data Cube(ODC)initiative offers a framework for operational continental-scale land cover mapping using analysis-ready Earth Observation data.This study utilised the FAO LCCS framework and the Landsat sensor data through Digital Earth Australia(DEA;Australia’s ODC instance)to generate consistent and continent-wide land cover mapping(DEA Land Cover)of the Australian continent.DEA Land Cover provides annual maps from 1988 to 2020 at 25 m resolution.Output maps were validated with∼12,000 independent validation points,giving an overall map accuracy of 80%.DEA Land Cover provides Australia with a nationally consistent picture of land cover,with an open-source software package using readily available global coverage data and demonstrates a pathway of adoption for national implementations across the world. | Christopher J.Owers Richard M.Lucas Daniel Clewley Belle Tissott Sean M.T.Chua Gabrielle Hunt Norman Mueller Carole Planque Suvarna M.Punalekar Pete Bunting Peter Tan Graciela Metternicht | 2022 | International Journal of Digital Earth2022，15，1： | 1 |
| 3 | The potential of a year-round school calendar for maintaining children’s weight status and fitness:Preliminary outcomes from a natural experiment显示文摘Purpose: To evaluate the potential of a year-round school calendar (180-day school year distributed across 12 months) as an intervention comparedto a traditional school calendar (180-day school year distributed across 9 months) for mitigating children's weight gain and fitness loss viaa natural experiment.Methods. Height, weight, and cardiorespiratory fitness (CRF) (i.e., Fitnessgram Progressive Aerobic Cardiovascular Endurance Run) were measured inchildren (5—12 years old) in 3 schools (2 traditional, 1 year-round, n = 990 students, age = 8.6 土 2.4 years, 53.1% male, 68.9% African American) from1 school district. Structure (represented by the presence of a school day) was the independent variable. Changes in body mass index (BMI), age- andsex-specific BMI z-scores (zBMI), BMI percentile, percent of overweight or obese children, and CRF (Progressive Aerobic Cardiovascular EnduranceRun laps completed) were assessed for summer 2017 (May—August 2017), school year 2017/2018 (August 2017—May 2018), and summer 2018(May—August 2018). Primary analyses examined the overall change in weight and CRF from summer 2017 until summer 2018 via multilevel mixedeffects regression, with group (traditional vs. year-round calendar), time, and a group-by-time interaction as the independent variables. Secondaryregression analyses estimated differences in change within and between groups during each time period, separately.Results. Year-round students gained less BMI (difference in A = —0.44, 95% confidence interval (CI): —0.67 to —0.03) and less CRF (differencein △ = — 1.92, 95%CI: —3.56 to —0.28) than students attending a traditional school overall. Compared with traditional students, during both sum・mers, year-round students gained less BMI (summer 2017 difference in A = —0.15, 95%CI: —0.21 to —0.08;summer 2018 difference in△ = —0.16, 95%CI: —0.24 to —0.07) and zBMI (summer 2017 difference in A = —0.032, 95%CI: —0.050 to —0.010;summer 2018 difference in△ = —0.033, 95%CI: —0.056 to —0.009), and increased CRF (summer 2017 difference in A = 0.40, 95%CI: 0.02—0.85;summer 2018 differencein A = 0.23, 95%CI: —0.25 to 0.74). However, the opposite was observed for the school year, with traditional students gaining less BMI andzBMI and increasing CRF compared with year-round students (difference in BMI A = 0.05, 95%CI: 0.03—0.07;difference in zBMI A = 0.012,95%CI: 0.005—0.019;difference in Progressive Aerobic Cardiovascular Endurance Run laps A = —0.43, 95%CI: —0.58 to —0.28).Conclusion'. The year-round school calendar had a small beneficial impact on children's weight status but not CRF. It is unclear if this benefit tochildren's weight would be maintained because gains made in the summer were largely erased during the school year. Trajectories of weight andCRF gain/loss were consistent with the structured days hypothesis. | r.glenn weaver ethan hunt aaron rafferty michael w.beets keith brazendale gabrielle tumer-mcgrievy russell r.pate alberto maydeu-olivares brian saelens shawn youngstedt | 2020 | Journal of Sport and Health Science2020，9，1： | 0 |
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