China
Africa
Explore chapters and articles related to this topic
Characterization, Mapping, and Monitoring of Rangelands: Methods and Approaches
Published in Prasad S. Thenkabail, Land Resources Monitoring, Modeling, and Mapping with Remote Sensing, 2015
Lalit Kumar, Priyakant Sinha, Jesslyn F. Brown, R. Douglas Ramsey, Matthew Rigge, Carson A. Stam, Alexander J. Hernandez, E. Raymond Hunt, Jr., Matthew C. Reeves
1. SOS-start of season Time of fi st occurrence of sNDVI ≥20% of growing season amplitude (within a calendar year) 2. EOS-end of season Time of last occurrence of sNDVI ≥20% growing season amplitude (within a calendar year) 3. AMP-amplitude Di¦erence between the growing season minimum sNDVI and the growing season peak NDVI 4. sNDVIpeak Value of peak growing season NDVI
The mathematics of leap years: sophistication versus content in mathematics education
Published in International Journal of Mathematical Education in Science and Technology, 2022
Yip Cheung Chan, Kam Moon Pang, Kenneth Young
A leap year is a calendar year with 366 days rather than 365. The basic regularity, already found in the Julian calendar, is familiar: (Rule 1) every year divisible by 4 (e.g. 2012, 2016) is a leap year. The refinements (Swinburne University of Technology, n.d.), adopted in the Gregorian calendar since 1582, are less known and sometimes omitted (Collins, n.d.): (Rule 2) every year divisible by 100 is not a leap year, except that (Rule 3) every year divisible by 400 is a leap year. Why are Rule 2 and Rule 3 needed? Where do the numbers 100 and 400 come from? Are there (in principle) better rules? And what does ‘better’ mean? Thinking through these issues will lead to (a) an interesting mathematical problem, as yet not precisely defined, that can be approached at different levels of precision, generality and rigour, and (b) broader reflection on pedagogy, as explained below.