Robert J Hijmans
Biographic Data
| ID | 199985 |
|---|---|
| NAME | Robert J Hijmans |
| GIVEN NAMES | Robert J |
| FAMILY NAME | Hijmans |
| SIGNATURE | HIJMANS R J |
| AFFILIATIONS | University of California, USA |
| ORCID | 0000-0001-5872-2872 |
| VERIFIED | Yes |
| TOTAL WORKS | 8 |
| TOTAL CITATIONS | 63 |
| AUTHOR COUNT | 8 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1999 |
| LATEST PUBLICATION YEAR | 2022 |
| H-INDEX | 2 |
Potential, attainable, and current levels of global crop diversity
High levels of crop species diversity are considered beneficial. However, increasing diversity might be difficult because of environmental constraints and the reliance on a few major crops for most food supply. Here we introduce a theoretical framework of hierarchical levels of crop diversity, in which the environmental requirements of crops limit potential diversity, and the demand for agricultural products further constrain attainable crop dive…
Ethical Dimensions of the GDPR, AI Regulation, and Beyond
Our digital society is changing rapidly, with emerging new technologies such as artificial intelligence (AI) and machine learning, robotics, and the internet of things. These changes trigger new fundamental ethical questions relating to privacy, data protection and other values, including human rights and the way they are affected by the extensive and intensive use of data for analytical and practical innovations. This article explores these ethi…
WorldClim 2
We created a new dataset of spatially interpolated monthly climate data for global land areas at a very high spatial resolution (approximately 1 km 2 ). We included monthly temperature (minimum, maximum and average), precipitation, solar radiation, vapour pressure and wind speed, aggregated across a target temporal range of 1970–2000, using data from between 9000 and 60 000 weather stations. Weather station data were interpolated using thin‐plate…
The contribution of rice agriculture and livestock pastoralism to prehistoric methane levels
We review the origins and dispersal of rice in Asia based on a data base of 443 archaeobotanical reports. Evidence is considered in terms of quality, and especially whether there are data indicating the mode of cultivation, in flooded (‘paddy’ or ‘wet’) or non-flooded (‘dry’) fields. At present it appears that early rice cultivation in the Yangtze region and southern China was based on wet, paddy-field systems from early on, before 4000 bc, where…
Mapping the global supply and demand structure of rice
Novel methods improve prediction of species’ distributions from occurrence data
Prediction of species’ distributions is central to diverse applications in ecology, evolution and conservation science. There is increasing electronic access to vast sets of occurrence records in museums and herbaria, yet little effective guidance on how best to use this information in the context of numerous approaches for modelling distributions. To meet this need, we compared 16 modelling methods over 226 species from 6 regions of the world, c…
Very high resolution interpolated climate surfaces for global land areas
We developed interpolated climate surfaces for global land areas (excluding Antarctica) at a spatial resolution of 30 arc s (often referred to as 1-km spatial resolution). The climate elements considered were monthly precipitation and mean, minimum, and maximum temperature. Input data were gathered from a variety of sources and, where possible, were restricted to records from the 1950–2000 period. We used the thin-plate smoothing spline algorithm…
Land Use Intensification and Disintensification in the Upper Cañete Valley, Peru
The contribution of rice agriculture and livestock pastoralism to prehistoric methane levels
We review the origins and dispersal of rice in Asia based on a data base of 443 archaeobotanical reports. Evidence is considered in terms of quality, and especially whether there are data indicating the mode of cultivation, in flooded (‘paddy’ or ‘wet’) or non-flooded (‘dry’) fields. At present it appears that early rice cultivation in the Yangtze region and southern China was based on wet, paddy-field systems from early on, before 4000 bc, where…
Land Use Intensification and Disintensification in the Upper Cañete Valley, Peru
Ethical Dimensions of the GDPR, AI Regulation, and Beyond
Our digital society is changing rapidly, with emerging new technologies such as artificial intelligence (AI) and machine learning, robotics, and the internet of things. These changes trigger new fundamental ethical questions relating to privacy, data protection and other values, including human rights and the way they are affected by the extensive and intensive use of data for analytical and practical innovations. This article explores these ethi…
Mapping the global supply and demand structure of rice
Land Use Intensification and Disintensification in the Upper Cañete Valley, Peru
Very high resolution interpolated climate surfaces for global land areas
We developed interpolated climate surfaces for global land areas (excluding Antarctica) at a spatial resolution of 30 arc s (often referred to as 1-km spatial resolution). The climate elements considered were monthly precipitation and mean, minimum, and maximum temperature. Input data were gathered from a variety of sources and, where possible, were restricted to records from the 1950–2000 period. We used the thin-plate smoothing spline algorithm…
Novel methods improve prediction of species’ distributions from occurrence data
Prediction of species’ distributions is central to diverse applications in ecology, evolution and conservation science. There is increasing electronic access to vast sets of occurrence records in museums and herbaria, yet little effective guidance on how best to use this information in the context of numerous approaches for modelling distributions. To meet this need, we compared 16 modelling methods over 226 species from 6 regions of the world, c…
Mapping the global supply and demand structure of rice
The contribution of rice agriculture and livestock pastoralism to prehistoric methane levels
We review the origins and dispersal of rice in Asia based on a data base of 443 archaeobotanical reports. Evidence is considered in terms of quality, and especially whether there are data indicating the mode of cultivation, in flooded (‘paddy’ or ‘wet’) or non-flooded (‘dry’) fields. At present it appears that early rice cultivation in the Yangtze region and southern China was based on wet, paddy-field systems from early on, before 4000 bc, where…
WorldClim 2
We created a new dataset of spatially interpolated monthly climate data for global land areas at a very high spatial resolution (approximately 1 km 2 ). We included monthly temperature (minimum, maximum and average), precipitation, solar radiation, vapour pressure and wind speed, aggregated across a target temporal range of 1970–2000, using data from between 9000 and 60 000 weather stations. Weather station data were interpolated using thin‐plate…
Potential, attainable, and current levels of global crop diversity
High levels of crop species diversity are considered beneficial. However, increasing diversity might be difficult because of environmental constraints and the reliance on a few major crops for most food supply. Here we introduce a theoretical framework of hierarchical levels of crop diversity, in which the environmental requirements of crops limit potential diversity, and the demand for agricultural products further constrain attainable crop dive…
Ethical Dimensions of the GDPR, AI Regulation, and Beyond
Our digital society is changing rapidly, with emerging new technologies such as artificial intelligence (AI) and machine learning, robotics, and the internet of things. These changes trigger new fundamental ethical questions relating to privacy, data protection and other values, including human rights and the way they are affected by the extensive and intensive use of data for analytical and practical innovations. This article explores these ethi…
Environmental Science (6 works) · Geography (6 works) · Agriculture (4 works) · Agroforestry (3 works) · Biology (3 works) · Computer Science (3 works) · Mathematics (3 works) · Population (3 works) · Agricultural economics (2 works) · Archaeology (2 works)