Geographical Institute

The statistics G i (d) and G i *(d), introduced in Getis and Ord (1992) for the study of local pattern in spatial data, are extended and their properties further explored. In particular, nonbinary weights are allowed and the statistics are related to Moran's autocorrelation statistic, I. The correlations between nearby values of the statistics are derived and verified by simulation. A Bonferroni criterion is used to approximate significance levels when testing extreme values from the set of statistics. An example of the use of the statistics is given using spatial‐temporal data on the AIDS epidemic centering on San Francisco. Results indicate that in recent years the disease is intensifying in the counties surrounding the city .

Abstract This paper provides a provisional diagram of modern capitalist business. I argue that modern business managers are under greater and greater pressures of time. They are expected to work to sterner, more extensive, and shorter-term measures of performance, and they must cope with a general speed-up in the conduct of business. These pressures are, in turn, forcing managers to be more innovative. In this paper, I argue that these imperatives are linked through attempts to interpellate ‘fast’ managerial subjects who are able to take the strain of permanent high performance. These subjects are being produced through three types of active and performative space which, taken together, constitute a new geographical machine, able to make new qualities and quantities visible and therefore available to be worked upon. I consider each of these spaces in turn: new spaces of visualization, represented here by the business magazine Fast Company; new spaces of embodiment, represented here by the use of performative ideas and techniques from the humanities; and new spaces of circulation, represented here by the phenomenon of increasingly mobile means of management. I conclude by arguing that these so-far hesitant and tentative spatialities may herald a new phase of ‘caring imperialism.’ Keywords:: new economycreativitygovernmentalityinnovationperformativityspace

For routine luminescence dating applications the commonly used Risø readers are bundled with analysis software, such as Viewer or Analyst. These software solutions are appropriate for most of the regular dating and publication jobs, and enable assessment of luminescence characteristics and provide basic statistical data treatment. However, for further statistical analysis and data treatments, this software may reach its limits. In such cases, open programming languages are a more appropriate approach. Here, we present the R package ‘Luminescence’ for a more flexible handling of luminescence data and related plotting purposes, using the statistical programming language R. The R language as well as the package and the source code are provided under the General Public License (GPL) conditions and are available for free. The basic functionality of the package is described along with three application examples. This package is not an alternative to the existing software (Analyst, Viewer) but may provide a collection of additional tools to analyse luminescence data and serve as a platform for further contributions

Spatial and temporal variations of pressure, temperature, and water vapor content in the atmosphere introduce significant confounding delays in interferometric synthetic aperture radar (InSAR) observations of ground deformation and bias estimates of regional strain rates. Producing robust estimates of tropospheric delays remains one of the key challenges in increasing the accuracy of ground deformation measurements using InSAR. Recent studies revealed the efficiency of global atmospheric reanalysis to mitigate the impact of tropospheric delays, motivating further exploration of their potential. Here we explore the effectiveness of these models in several geographic and tectonic settings on both single interferograms and time series analysis products. Both hydrostatic and wet contributions to the phase delay are important to account for. We validate these path delay corrections by comparing with estimates of vertically integrated atmospheric water vapor content derived from the passive multispectral imager Medium‐Resolution Imaging Spectrometer, onboard the Envisat satellite. Generally, the performance of the prediction depends on the vigor of atmospheric turbulence. We discuss (1) how separating atmospheric and orbital contributions allows one to better measure long‐wavelength deformation and (2) how atmospheric delays affect measurements of surface deformation following earthquakes, and (3) how such a method allows us to reduce biases in multiyear strain rate estimates by reducing the influence of unevenly sampled seasonal oscillations of the tropospheric delay.

The dual frequency radio signals of the Global Positioning System (GPS) allow measurements of the total number of electrons, called total electron content (TEC), along a ray path from GPS satellite to receiver. We have developed a new technique to construct two-dimensional maps of absolute TEC over Japan by using GPS data from more than 1000 GPS receivers. A least squares fitting procedure is used to remove instrumental biases inherent in the GPS satellite and receiver. Two-dimensional maps of absolute vertical TEC are derived with time resolution of 30 seconds and spatial resolution of 0.15° × 0.15° in latitude and longitude. Our method is validated in two ways. First, TECs along ray paths from the GPS satellites are simulated using a model for electron contents based on the IRI-95 model. It is found that TEC from our method is underestimated by less than 3 TECU. Then, estimated vertical GPS TEC is compared with ionospheric TEC that is calculated from simultaneous electron density profile obtained with the MU radar. Diurnal and day-to-day variation of the GPS TEC follows the TEC behavior derived from MU radar observation but the GPS TEC is 2 TECU larger than the MU radar TEC on average. This difference can be attributed to the plasmaspheric electron content along the GPS ray path. This method is also applied to GPS data during a magnetic storm of September 25, 1998. An intense TEC enhancement, probably caused by a northward expansion of the equatorial anomaly, was observed in the southern part of Japan in the evening during the main phase of the storm.

NASA's Global Ecosystem Dynamics Investigation (GEDI) is a spaceborne lidar mission which will produce near global (51.6°S to 51.6°N) maps of forest structure and above-ground biomass density during its 2-year mission. GEDI uses a waveform simulator for calibration of algorithms and assessing mission accuracy. This paper implements a waveform simulator, using the method proposed in Blair and Hofton (1999; https://doi.org/10.1029/1999GL010484), and builds upon that work by adding instrument noise and by validating simulated waveforms across a range of forest types, airborne laser scanning (ALS) instruments, and survey configurations. The simulator was validated by comparing waveform metrics derived from simulated waveforms against those derived from observed large-footprint, full-waveform lidar data from NASA's airborne Land, Vegetation, and Ice Sensor (LVIS). The simulator was found to produce waveform metrics with a mean bias of less than 0.22 m and a root-mean-square error of less than 5.7 m, as long as the ALS data had sufficient pulse density. The minimum pulse density required depended upon the instrument. Measurement errors due to instrument noise predicted by the simulator were within 1.5 m of those from observed waveforms and 70-85% of variance in measurement error was explained. Changing the ALS survey configuration had no significant impact on simulated metrics, suggesting that the ALS pulse density is a sufficient metric of simulator accuracy across the range of conditions and instruments tested. These results give confidence in the use of the simulator for the pre-launch calibration and performance assessment of the GEDI mission.

This paper accompanies a map that shows the extent of permafrost in the Northern Hemisphere between 25 and 17 thousand years ago. The map is based upon existing archival data, common throughout the Northern Hemisphere, that include ice‐wedge pseudomorphs, sand wedges and large cryoturbations. Where possible, a distinction is made between areas with continuous permafrost and areas where permafrost is either spatially discontinuous or sporadic. The associated mean annual palaeo‐temperatures that are inferred on the basis of present‐day analogues increase understanding of the possible changes in permafrost extent that might accompany current global warming trends. Areas with relict permafrost and areas that were formerly exposed due to lower sea level (submarine permafrost) are also mapped. Mapping is mostly limited to lowland regions (areas approximately <1000 m a.s.l.). Striking features that appear from the map are (i) the narrow permafrost zone in N orth A merica, which contrasts with the broader LPM permafrost zone in E urasia (that may be related to different snow thickness or vegetation cover), (ii) the zonal extent of former LPM permafrost (that may reflect sea‐ice distribution), which contrasts with the present‐day pattern of permafrost extent (especially in E urasia) and (iii) the relatively narrow zones of LPM discontinuous permafrost (that may indicate strong temperature gradients).

Abstract The conditions of transport of detritus by moving water constitute one of the most vital problems confronting students of sedimentation. This article by Hjulstrom summarizes the main aspects of present knowledge of the problem as applied to rivers. Many of the relations for river water apply to ocean water; but the sea differs materially from rivers in at least three ways: the large masses of water involved, the slowness with which the water moves, and the effect of tides. Notwithstanding the fact that these three phenomena modify the picture as portrayed by Hjulstrom for rivers, the information he presents is of great value to students of sedimentation. This article is a summary of a longer article, which in itself for the most part also is a summary. Consequently in this abstract it seems futile to attempt to present more than a few comments about the main features he describes. Water moves in two main ways—by laminar flow and by turbulent flow. In laminar flow the water travels in parallel bands; in turbulent flow it moves in pulsations in a variable way. The velocity of water in laminar flow is always low; in turbulent flow it may be low or high. There are several types of turbulent flow, each of which depends mainly upon the velocity. The transport of detritus by moving water is affected by many factors, the most influential of which is the velocity of the water. Particles are transported individually or collectively. Transport of individual particles is in four types: sliding, rolling, saltation (jumping), and suspension. The first three are along the bottom and the fourth is in the water. With increasing velocity the mode of transport ordinarily passes successively through these four states of transport. The particles also may move collectively, that is in masses. In this way are formed such features as ripples, bars, and banks. The laws governing the different kinds of transportation are complicated. For particles larger than sand (0.5 millimeter) the size of particles that can be put in motion increases as the velocity of the water becomes greater; but for smaller particles the minimum velocity that is required in order to bring them into suspension does not decrease as the particles become smaller; instead it increases. Thus it is easier to move sand off the bottom than silt. Once a particle is in motion it continues to be transported until the velocity of the water decreases to a certain speed. This minimum transporting velocity for particles of sand size or larger seems to be about 30 per cent less than the velocity needed to remove the particles from the bottom; but for progressively smaller particles, the minimum transporting velocity becomes increasingly less in proportion to the velocity required to make the particles go into suspension. (Editor’s abstract.)

The application of geographically weighted regression (GWR) - a local spatial statistical technique used to test for spatial nonstationarity - has grown rapidly in the social, health and demographic sciences. GWR is a useful exploratory analytical tool that generates a set of location-specific parameter estimates which can be mapped and analysed to provide information on spatial nonstationarity in relationships between predictors and the outcome variable. A major challenge to GWR users, however, is how best to map these parameter estimates. This paper introduces a simple mapping technique that combines local parameter estimates and local t-values on one map. The resultant map can facilitate the exploration and interpretation of nonstationarity.

A large fraction of the world grasslands and savannas are undergoing a rapid shift from herbaceous to woody-plant dominance. This land-cover change is expected to lead to a loss in livestock production (LP), but the impacts of woody-plant encroachment on this crucial ecosystem service have not been assessed. We evaluate how tree cover (TC) has affected LP at large spatial scales in rangelands of contrasting social-economic characteristics in the United States and Argentina. Our models indicate that in areas of high productivity, a 1% increase in TC results in a reduction in LP ranging from 0.6 to 1.6 reproductive cows (Rc) per km(2). Mean LP in the United States is 27 Rc per km(2), so a 1% increase in TC results in a 2.5% decrease in mean LP. This effect is large considering that woody-plant cover has been described as increasing at 0.5% to 2% per y. On the contrary, in areas of low productivity, increased TC had a positive effect on LP. Our results also show that ecological factors account for a larger fraction of LP variability in Argentinean than in US rangelands. Differences in the relative importance of ecological versus nonecological drivers of LP in Argentina and the United States suggest that the valuation of ecosystem services between these two rangelands might be different. Current management strategies in Argentina are likely designed to maximize LP for various reasons we are unable to explore in this effort, whereas land managers in the United States may be optimizing multiple ecosystem services, including conservation or recreation, alongside LP.

A combined geophysical and thermal monitoring approach for improved observation of mountain permafrost degradation is presented. Time‐lapse inversion of repeated electrical resistivity tomography (ERT) measurements allows both active layer dynamics and interannual permafrost conditions to be delineated. Analysis of a comprehensive ERT monitoring data set from a 7‐year study at Schilthorn, Swiss Alps, confirmed the applicability of ERT monitoring to observations of freezing and thawing processes on short‐term, seasonal, and long‐term scales. Long‐term resistivity changes were evaluated on the basis of seasonal resistivity variations showing an annual cycle with high resistivities in frozen and low resistivities in unfrozen state. One important result is the detection of a sustained impact of the extraordinarily hot European summer of 2003 on the permafrost regime, which is more severe than previously assumed from borehole temperatures. Combined analyses of ERT monitoring and borehole temperature data revealed substantial ground ice degradation as a consequence of the 2003 summer, which did not recover in the following years despite suitable subsurface temperature conditions. Resistivity changes that are nonconforming to long‐term temperature evolution are attributed to the limited availability of liquid water and/or changes in material characteristics (e.g., pore volume changes as a result of subsidence).

The operational dilemmas and challenges associated with the practice of community-based environmental planning (CBEP) are examined. The paper examines the frequently invoked 'bottom-up' versus 'top-down' dichotomy and argues that environmental governance is more complex, dynamic and multi-scalar than this simple dichotomy implies. The paper identifies six key problems with the CBEP approach: (i) the conceptualization of 'community' which poorly accounts for difference; (ii) problems of inequality; (iii) the organizational capacity and efficacy of community groups; (iv) the scale of CBEP; (v) the types of knowledge utilized by communities in environmental management; and (vi) the potential for parochial concerns to dominate the priorities and agenda of community organizations. The paper analyses each of these issues, identifies planning principles that may aid resolution, and suggests possible remedies.

Abstract The main aim of this article is to test Richard Florida's hypothesis regarding the spatial mobility of the ‘creative class’ and the role of soft factors in their decisions concerning their place of residence. Empirical data from 11 European cities suggest that the European ‘creative class’ is not as mobile as Florida suggests. Cultural and institutional constraints contribute to lower mobility rates in Europe. In the article the role of ‘personal trajectories’, completely disregarded until now, is highlighted. On the basis of empirical research data, the role of soft location factors in the decisions of creative workers does not seem to be as relevant as has been implied by Florida and others. These factors play only a marginal role in attracting members of the creative class to a city. On the other hand, they do indeed play an important role in retaining them once they have relocated. This provides some support for policies aimed at bringing about the type of conditions characteristic of creative cities. Résumé L'article met à l'épreuve l'hypothèse de Richard Florida concernant la mobilité spatiale de la ‘classe créative’ et le rôle des facteurs intangibles (soft factors) dans le choix du lieu de résidence de ses membres. Des données empiriques collectées dans onze grandes villes d'Europe indiquent que la classe créative européenne n'est pas aussi mobile que Florida le suggère. Des contraintes culturelles et institutionnelles contribuent notamment à y abaisser les taux de mobilité. L'article souligne l'importance des ‘trajectoires personnelles’ jusqu'à présent totalement négligées. D'après les données de l'étude empirique, les facteurs d'implantation intangibles qui entrent dans les décisions des travailleurs créatifs ne sont apparemment pas aussi importants que ce que Florida et d'autres ont donnéà entendre. Ces facteurs ne jouent qu'un rôle marginal pour attirer les membres de la classe créative vers une ville. En revanche, ils présentent effectivement un grand intérêt dans la mesure où ils aident à les retenir une fois sur place. Cet aspect vient appuyer les politiques qui cherchent à réunir les conditions caractéristiques des villes créatives.

Abstract. Human land-use activities have resulted in large changes to the biogeochemical and biophysical properties of the Earth surface, with consequences for climate and other ecosystem services. In the future, land-use activities are likely to expand and/or intensify further to meet growing demands for food, fiber, and energy. As part of the World Climate Research Program Coupled Model Intercomparison Project (CMIP6), the international community is developing the next generation of advanced Earth System Models (ESMs) to estimate the combined effects of human activities (e.g. land use and fossil fuel emissions) on the carbon-climate system. A new set of historical data based on the History of the Global Environment database (HYDE), and multiple alternative scenarios of the future (2015–2100) from Integrated Assessment Model (IAM) teams, are required as input for these models. Here we present results from the Land-use Harmonization 2 (LUH2) project, with the goal to smoothly connect updated historical reconstructions of land-use with new future projections in the format required for ESMs. The harmonization strategy estimates the fractional land-use patterns, underlying land-use transitions, key agricultural management information, and resulting secondary lands annually, while minimizing the differences between the end of the historical reconstruction and IAM initial conditions and preserving changes depicted by the IAMs in the future. The new approach builds off a similar effort from CMIP5, and is now provided at higher resolution (0.25 × 0.25 degree), over a longer time domain (850–2100, with extensions to 2300), with more detail (including multiple crop and pasture types and associated management practices), using more input datasets (including Landsat remote sensing data), updated algorithms (wood harvest and shifting cultivation), and is assessed via a new diagnostic package. The new LUH2 products contain > 50 times the information content of the datasets used in CMIP5, and are designed to enable new and improved estimates of the combined effects of land-use on the global carbon-climate system.

China is a key region for understanding fire activity and the drivers of its variability under strict fire suppression policies. Here, we present a detailed fire occurrence dataset for China, the Wildfire Atlas of China (WFAC; 2005-2018), based on continuous monitoring from multiple satellites and calibrated against field observations. We find that wildfires across China mostly occur in the winter season from January to April and those fire occurrences generally show a decreasing trend after reaching a peak in 2007. Most wildfires (84%) occur in subtropical China, with two distinct clusters in its southwestern and southeastern parts. In southeastern China, wildfires are mainly promoted by low precipitation and high diurnal temperature ranges, the combination of which dries out plant tissue and fuel. In southwestern China, wildfires are mainly promoted by warm conditions that enhance evaporation from litter and dormant plant tissues. We further find a fire occurrence dipole between southwestern and southeastern China that is modulated by the El Niño-Southern Oscillation (ENSO).

Abstract Reliable information on building rooftops is crucial for utilizing limited urban space effectively. In recent decades, the demand for accurate and up-to-date data on the areas of rooftops on a large-scale is increasing. However, obtaining these data is challenging due to the limited capability of conventional computer vision methods and the high cost of 3D modeling involving aerial photogrammetry. In this study, a geospatial artificial intelligence framework is presented to obtain data for rooftops using high-resolution open-access remote sensing imagery. This framework is used to generate vectorized data for rooftops in 90 cities in China. The data was validated on test samples of 180 km 2 across different regions with spatial resolution, overall accuracy, and F1 score of 1 m, 97.95%, and 83.11%, respectively. In addition, the generated rooftop area conforms to the urban morphological characteristics and reflects urbanization level. These results demonstrate that the generated dataset can be used for data support and decision-making that can facilitate sustainable urban development effectively.

Abstract Paleoprecipitation reconstructions on the basis of pollen are well known, but they do not provide high temporal resolution for glacial periods. High-resolution paleoprecipitation reconstructions for the last glaciation based on the isotopic record organic matter in loess from Nussloch (Rhine Valley, Germany) are consistent with paleoprecipitation inferred from peat in the same area using an independant method. Thus, δ 13 C of loess organic matter can be used as a proxy for paleoprecipitation.

Das vorliegende Buch führt in die Anthropogeographie/Humangeographie insgesamt und in wesentliche Teilgebiete ein: Bevölkerungsgeographie, Wirtschaftsgeographie, Verkehrsgeographie, Geographie ländlicher Siedlungen, Stadtgeographie. Heinz Heinebergs Grundlagenwerk liegt nunmehr in 3., überarbeiteter und aktualisierter Auflage vor. Die Konzeption beruht auf jahrzehntelanger Lehrerfahrung; Inhalt und Zuschnitt des Werkes sind auf die einschlägigen Einführungsveranstaltungen abgestimmt. Gleichzeitig bietet der Band ein Propädeutikum zu weiteren Bänden des Grundrisses Allgemeine Geographie, in denen Einzelbereiche der Humangeographie vertiefend und prüfungsvorbereitend behandelt werden.

In a sample of patients, discharged from Veterans Administration Hospitals in the United States, suffering from ulcerative colitis and regional enteritis and mixed forms of these diseases, the proportion of Jews was four times as high as in a corresponding sample of general medical and surgical patients.

Significance Atmospheric dust is a major component of climate change. However, the relationship between glacial continental dust activity and abrupt centennial–millennial-scale climate changes of the North Atlantic is poorly known. Recent advances in high-precision radiocarbon dating of small gastropods in continental loess deposits provide an opportunity to gain unprecedented insights into dust variations and its major drivers at centennial–millennial scales from a near-source dust archive. Here, we show that Late Quaternary North Atlantic temperature and dustiness in Greenland and Europe were largely synchronous and suggest that this coupling was driven via precipitation changes and large-scale atmospheric circulation.