Models of an Optimally Organized Network of Service Establishments in a Region

Networks of varying complexity are analyzed. The number of service centers is derived, first, by assuming that the upper limit of their range is fixed and construction costs are to be minimized. A second step yields the location of the service centers on the basis of minimizing the total time spent by residents in traveling to the centers.     

Alaska

The paper reports on results of an experiment concerned with assessing the cartographic accuracy of an optically processed spaceborne synthetic aperture radar (SAR) image taken over a very hilly area in the Scottish Highlands. A number of mathematical algorithms were used to transform the image to the terrain co‐ordinate system. The results show that it is indeed possible to extract metric information from this type of imagery to suit the purposes of small‐scale reconnaissance‐type planimetric mapping at 1:250,000 and smaller. This is important for many developing countries where topographic coverage is either poor or completely absent.     

The Topographic and Soil Maps of the United States

A comparison of United States topographic maps with the actual terrain shows a disregard of geographical differences in the use of vegetation symbols, contour lines and population centers. This is attributed to the fact that topographic technicians lack a geographic background. The county soil surveys of the United States evoke a great deal of admiration and praise, but the lack of a uniform soil classification enabling the compilation of generalized soil maps is deplored.     

An Assessment of the Space-Time Differential Model for Aggregate Trip Behavior to Planned Suburban Shopping Centers

Aggregate trip behavior to planned suburban shopping centers is studied in terms of changes in trip distance and shopping time within a framework of trip frequency, center scale, and consumer mobility. Such changes are expressed by a second-order differential equation. The assumed shopping strategy is that consumers accelerate the shopping trip cycle by minimizing trip distances. This can be solved to provide theoretical norms to assess against an exploratory data set compiled from 2,810 surveys undertaken in 1980/82 and 1988/89 over a range of centers. The analysis shows a significant relationship between the gravity coefficient and trip frequency. The samples are tested for periodicity using Fourier analysis. The results show that “small” centers are more likely to exhibit periodic behavior. “Large” centers do not follow this hypothesis. Both the gravity coefficient and trip frequency are shown to be quadratic functions of center size. The nonlinearity may be introduced by the agglomeration of shopping opportunities at larger centers. A critical value for “small-” and “large-”center behavior is determined from the minimum points of these distributions. A second equation from classical diffusion analysis is tested for “large” center behavior, where consumers accelerate spatial choice through a time minimization strategy. The results suggest that this strategy occurs at the midrange specialty center during the afternoon of the pre-Christmas rush rather than at large regional centers. The empirical characteristics of the three types of trip behavior are summarized.     

The use of Caesium–137 to Assess Surface Soil Erosion Status in a Water–Supply Catchment in the Hunter Valley,New South Wales,Australia

In the absence of direct erosion measurements, the soil activity of the fallout radionuclide caesium–137 (¹³⁷Cs) offers an attractive tool for the estimation of long–term (approximately 45 years) net surface and minor rill soil erosion rates for hillslopes. A transect–based soil sampling technique was applied to one woodland and five grazed pasture hillslopes in the Williams River water–supply catchment in the Hunter Valley, New South Wales. An Australian regression model (SOILOSS) relating net soil loss from runoff–erosion plots to ¹³⁷Cs deficit in soils was used to calculate a weighted net surface and minor rill erosion rate for the six hillslopes. The net median surface erosion rates ranged between 0.00 and 0.64 t ha^–1yr^–1with the average median soil erosion rate of 0.19 t ha^–1 yr^–1(std. dev. = 0.23), indicating that these hillslopes were unlikely to be major sources of sediment to the catchment's waterways. Net soil loss rates were also shown to be low in comparison to Australia–wide data and comparable to hillslope data obtained elsewhere in the same region. Minimum and maximum error bounds were provided with each erosion rate to account for radionuclide detector count error. For one hillslope the estimated error due to detection was 1.34 t ha^–1yr^–1, while the remaining five hillslopes exhibited error of up to 0.41 t ha^–1yr^–1. Correlation analyses between the net soil loss rates and physical hillslope characteristics were non–significant.     

Malaysia and the End of the Bretton Woods System 1965–72: Disentangling from Sterling

This article examines the tense and complex monetary relationship between Britain, Singapore and Malaysia in the period from 1965 to 1972. It questions the assumption that Malaysia's economic significance to Britain was ‘on the wane’ by the 1960s. As the second largest government holder of sterling assets in the world, Malaysia should have been able to exert considerable leverage in London over the disposition of these assets. Ultimately, however, the very scale of these assets limited Malaysia's room for manoeuvre, as it could not sell off a significant proportion of them without undermining international confidence in the exchange rate of the pound and thereby precipitating the devaluation of its remaining sterling assets. The devaluation of sterling in 1967 emerges as a watershed in relations between London and Kuala Lumpur, with the Malaysians thereafter seeking to forge a more independent monetary policy. It is clear, however, that they did not actually succeed in doing so until 1972.     

A Ground Motion Record Selection Approach Based on Multiobjective Optimization

The evaluation of the seismic safety and reliability of buildings and building contents within a probabilistic framework often requires response history analyses using site-specific ground motion records. The ground motion selection method proposed in this paper addresses this issue by a stochastic search procedure in which record sets are selected such that first- and second-order statistics (median and dispersion) satisfy predefined ground motion spectrum targets over a wide period range. Once a ground motion record set is selected, it can be used for seismic assessment of a broad class of buildings within the target period range at the given location.     

A Review of the Environmental Policy Literature from 2014 to 2017 with a Closer Look at the Energy Justice Field

This review article documents and analyzes trends within the environmental policy literature published between 2014 and 2017. We find that environmental policy scholarship has recently shifted its focus from more traditional topics, such as watershed and ecosystem management, to other modern issues, such as climate change and energy. The environmental policy literature has increased in complexity and become more interdisciplinary in nature, which we illustrate with a discussion of the energy justice literature. The methodological approaches used by environmental policy scholars have also become increasingly diverse, with a notable uptick in statistical and modeling approaches. We find that some topics, such as policy failure, gender issues, and energy welfare policies are under‐explored, and certain regions within the world, such as developing countries, are less frequently studied. We encourage scholars to consider these gaps in the literature when developing future research.     

Assessing the preservation potential of temperate,lowland alluvial sediments using airborne lidar intensity

Archaeological applications of airborne lidar topographic data are now well established and documented. However, less well explored by archaeologists and palaeoenvironmentalists are the potential applications of lidar intensity data. Here we explore this potential to remotely determine the differential preservation potential of valley floor sediments, within a temperate, lowland environment, especially where preserved within palaeochannels. We compare airborne lidar intensity data with simultaneously collected terrestrial records of sediment organic content, moisture and stratigraphy. Results suggest that while a correlation exists between lidar intensity values and sediment properties, it is neither linear nor robustly predictable. Nevertheless it is suggested that examination of lidar intensity data serve a useful purpose when assessing valley floor alluvial sediments.     

GPS-based measurement of geographic spillovers in tourism – example of Polish districts

The agglomeration phenomenon in tourism often spreads beyond the borders of territorial units what is referred to as geographic spillovers. However, the measurement of spatial concentration of tourism demand and economic activity is usually based on statistics collected within regional administrative boundaries and omits the spatial interdependency between neighboring regions. Recognition of such spatial interdependency in the standard procedure to define neighborhood relies on the distance between geometric means (centroids) of territorial units which, however, rarely reflects real ‘centers’ of tourism agglomerations and leads to errors and biased results. Hence, we propose to modify the measures of the neighborhood with the use of GPS coordinates of tourism firms and attractions in order to designate their regional central tendencies and thus to correct (shift in space) localization of centroids of territorial units. We test the usefulness of the new approach to obtain a more precise measurement of spatial concentration when tourism spills over beyond the boundaries of territorial units using the example of Polish districts. We employ the exploratory spatial data analysis (spatial statistics) and spatial regression models – to assess the difference between using traditional centroids and GPS coordinates in defining neighborhood and determining spillover effects in regional analysis. Furthermore we apply the new method into the model of tourism potential in order to identify spillover effects in Polish regions. We use the data collected by Central Statistical Office (tourists staying overnight in 379 districts in 2014) and by Polish Tourist Organization (14,390 GPS coordinates of individual entities: tourism firms and attractions). The neighborhood determined with the use of GPS coordinates to measure the distance between centers of tourism agglomerations eliminates the dependence of the results on the administrative boundaries – but only to some degree. The challenge is to identify tourism agglomeration phenomenon as such, based on the mobility of tourists in space.     

Resource abundance constraints on the early post-contact Cherokee population

We present the combination of an analysis of resource demand by the early post-contact (1721) Cherokee population with spatially explicit estimates of production for five key resources: architectural land, agricultural land, firewood, hard mast, and white-tailed deer (Odocoileus virginianus). We combine a recent synthesis of village location and population, a map of recognized Cherokee territory, digital terrain data, estimates of per capita demand, and productive capacity for each resource. Average, high, and low demands were estimated for each resource and assigned based on a weighted function of terrain and distance from each village. We conclude that Cherokee demands for architectural and agricultural land, hard mast, and fuelwood were easily met within a short proximity to each town under all combinations of production and demand. These resources were likely not limiting, and were satisfied for the entire Cherokee population by less than 1% of the entire recognized Cherokee territory in 1721. These resources likely exceeded demand even when sources were restricted to the convex hull of the Cherokee territory, or to near stream, flat regions. Deer resources were likely harvested over a much larger area and to a much greater extent. Our best estimate of deer resource demand was 32% of annual sustainable production in the Cherokee territory, with from 16 to 48% of estimated sustainable production harvested for low and high demand estimates, respectively. Our estimates vary in response to uncertainties in deer production, harvest proportion, deer density, and sustainable harvest rates. Deer demand was substantially higher under all combinations of conditions than that available within the convex hull of Cherokee villages, indicating significant travel was needed to furnish deer requirements. Spatially explicit models that consider terrain- and distance-related tradeoffs suggest that Cherokee demand for deer drove harvest over areas consisting of over half the recognized Cherokee territory.     

Investigating DEM Error Patterns by Directional Variograms and Fourier Analysis

In many spatial analyses and GIS applications, a Digital Elevation Model (DEM) is often used to derive a variety of new variables and parameters. Previous research shows that the accuracy of derived variables is affected, not merely by the magnitude of DEM errors and the algorithms applied to derive these variables, but also by the spatial structure of DEM errors. However, the lack of knowledge and understanding of the spatial structure of DEM errors often handicaps the analysis of error propagation. This paper investigates the spatial autocorrelation and anisotropic pattern of DEM error by using directional variograms in the spatial domain and Fourier analysis in the frequency domain. Based on an empirical study, it is concluded that the spatial autocorrelation pattern of DEM errors is anisotropic and scale-dependent, and that the maximum direction and range of the autocorrelation depends upon the orientation and wavelength of the terrain features. For a smooth terrain, the magnitude of DEM errors is correlated to surface slope. For a rugged terrain, the elevation values in DEMs tend to be underestimated in ridges, and overestimated in valleys, but the correlation between the DEM error and surface slope is quite low.     

‘Rid grasse of bones’: A taphonomic study of the bones from midden deposits at the Neolithic and Bronze age site of Runnymede,Surrey, England

Runnymede has large samples of Neolithic and Late Bronze Age animal bones, with contrasting preservation conditions in both periods. The bone evidence has been used to interpret the formation of the site deposits. There are few articulated bones, and no joins were found in butchered bone, indicating that the area studied did not contain primary refuse. Various aspects of bone alteration have been analysed: (i) the proportion of bones with very good surface preservation was high in the in situ Neolithic excavation units and the basal Bronze Age midden, but bones in the upper units were mostly eroded. These units are reworked flood deposits. The greater degree of fragmentation of the bone in the reworked units has been quantified, using a system of recording the ‘zones’ present on each bone, which allows calculation of the fraction present. It is also demonstrated that the reworked units contain a lower proportion of identified bones and a higher proportion of teeth and iaws than the units with well-preserved bone, (ii) Quantification of canid gnawing shows, unexpectedly, that more was recorded on well-preserved bone. Thus recognition of gnawing depends on bone condition. This also confirms that most of the erosion of the bone surface is a post-depositional phenomenon. The sequence of activities is therefore interpreted as follows: meat was cooked and consumed, and the bones discarded for the dogs. At a later stage, larger bones were picked up and thrown away in the river or midden. Some ethnographic examples of periodic cleaning of farming settlements are cited.     

Unearthing feminist territories and terrains

The constructs of ‘territory’ and ‘terrain’ are the subject of increasing scrutiny within political geography. While momentum builds in their interrogation as both diverse and lively practices, and complex political technologies, this article takes pause. Drawing on a rich and diverse range of feminist scholarship, it seeks to reflect upon existing trajectories and provide provocation for further accounting. Inspired throughout by, and seeking to bring to bear, a feminist perspective on territory and terrain, this article follows a tripartite structure. First, it critically explores the bodies of knowledge historically underpinning the concepts of territory and terrain. Developing a call for a feminist historiography of territory and terrain, we reflect upon both the gendered evolution of the concepts, and their ongoing reproduction in conceptual debates. Second, it seeks to both highlight and diversify embodied accounts and accountings of these concepts. Here, thinking with and beyond the body, we turn to the non-human and spiritual to explore territory and terrain in expanded and extended ways. Lastly, we examine bodies of expertise, reflecting on academic territories and terrains, and highlighting potential concepts and methodologies seeking to (re-)sculpt and (re-)articulate understandings of territory and terrain. The paper, whilst not all-encompassing, serves as an important provocation that seeks more equitable accounts of political geography's messy, muddy, and lively territories and terrains.     

Measuring the relative topographic position of archaeological sites in the landscape,a case study on the Bronze Age barrows in northwest Belgium

Local topography is an important parameter determining the erection of a certain type of site on a certain location in the landscape. Despite the importance of topography in archaeological landscape research, the role of local topography has remained rather unexplored compared to other specific topographic parameters such as slope, aspect, curvature or visibility. Therefore, three methods to assess the relative topographic position of sites are applied and discussed here. The Bronze Age barrow dataset of northwest Belgium acts as the subject for this methodological case study. First, elevation percentile calculates the area that is lower than the central point within a predetermined neighborhood. Secondly, difference from mean elevation measures the relative topographic position of the central point as the difference between the elevation of this central point and the mean elevation within a predetermined neighborhood. And finally, deviation from mean elevation calculates the relative topographic position of the central point as the difference from mean elevation divided by the standard deviation of elevation, within a predetermined neighborhood. These three methods, each with their advantages and disadvantages, prove to be an added value for archaeological landscape research.     

Rapid On‐site Topographic Mapping with a Handheld Laser Range Finder for a Geoarchaeological Survey in Syria

A digital elevation model and a topographic map of an archaeological site in Syria were created from a field topographic survey with a handheld laser range finder and data post‐processing using a notebook personal computer with Geographical Information System software. The method enabled rapid on‐site topographical mapping even under technical and political restrictions in the country. In an area of about 1 km², coordinates of random points on the land surface were measured, and a DEM with a 10 m interval grid was generated from the point cloud using Kriging interpolation. The DEM enables various topographic representations to be constructed, such as contour lines, cross sections and slope distribution maps. The DEM‐derived contour lines with a 1 m interval were combined with vector data showing roads and buildings to provide a topographic map. Topographic cross sections created from the DEM generally agree with sections surveyed with a hand level and a measurement tape. The obtained DEM and map are useful for preliminary field research.     

北京王府井大街消费行为的空间特征分析

根据对北京市王府井大街消费者调查所获数据的分析,以地块为分析单位从空间角度探讨消费者的行为特征,包括人流、停留人次、消费金额、人均消费金额等要素的空间分布的基本特征以及入口、回游、出口各阶段的空间特征,以认识消费行为的复杂性和影响因素的多样性。
研究发现:总消费额与消费者人数的相关性远高于人均消费,显示了商业街经济活动以量取胜的现实;是否位于步行街区域及是否设有大型百货公司的影响在每个层面都得到了很明显的体现;另外由于公共交通所决定的出入口区也影响到了附近地块的商业表现。对出入口位置以及起始、回游、结束三地块消费者的人流分布的分析表明:位于起始消费阶段的消费者的人均消费额要远高于其他阶段。消费者的回游流动特点:①具有沿步行街区域由南向北的明显方向性;②相邻地块回游较为频繁;③步行街内部回游频繁,以外地区,特别是离主要出入口较远的北部区域鲜有人的活动;④大型百货之间的回游,特别是对面地块之间的互串较为频繁,最大的回游出现在新东安市场-北京市百货大楼。     

四川大邑县高山古城遗址出土新石器时代动物骨骼遗存

通过对四川大邑县高山古城遗址2015、2016年出土动物骨骼遗存做了比较详细的鉴定、测量、统计和分析,可以肯定为家畜的仅有猪和狗。从出土动物骨骼的NISP、MNI统计来看,家猪的比重均占绝对优势,NISP占比达93.78%,MNI占比为86.49%;家猪上、下第三臼齿的长度、宽度较小,均处于家猪第三臼齿的长、宽参数范围内;从猪的年龄结构来看,以月龄10~20个月为主,也与一般农耕聚落家猪的宰杀年龄结构相符。鉴于以上三个方面的观察,可以推断高山古城先民饲养家猪的技术比较成熟且稳定,饲养家猪也是先民肉食资源最主要的获取途径。而狗所占的比重不高,占NISP、MNI的比重分别为3.76%和5.41%,可能多用做狩猎伴侣或其他。结果表明宝墩文化时期的高山古城先民以饲养家猪作为获取肉食资源的主要途径,当时的家畜饲养技术比较成熟稳定,而稻-粟混作的农业体系无疑为家畜的饲养奠定了坚实的基础。     

Compensation-theorem analyses of ground wave propagation over irregular,inhomogeneous terrains

Work during the last 40 years on various aspects of ground wave propagation is surveyed, including dipole propagation over flat homogeneous and inhomogeneous terrains, smooth homogeneous earth, and irregular homogeneous and inhomogeneous terrains. The Ott-Volterra integral equation for TM_p ground wave field over irregular homogeneous paths is discussed and an occasional troublesome behavior of the modified Sommerfeld attenuation function explained. Several representations of spatially distributed transmitter current are presented. A Compensation-theorem Volterra for the ground wave over inhomogeneous terrain is derived, in the parabolic wave equation approximation. A recent Compensation-theorem integral equation for general terrain satisfying the hyperbolic wave equation is reviewed. Computations for several very rough terrains indicate the ‘parabolic’ integral equations may often be more accurate.     

Constructing the Spatial Weights Matrix Using a Local Statistic

Spatial weights matrices are necessary elements in most regression models where a representation of spatial structure is needed. We construct a spatial weights matrix, W , based on the principle that spatial structure should be considered in a two‐part framework, those units that evoke a distance effect, and those that do not. Our two‐variable local statistics model (LSM) is based on the G_i* local statistic. The local statistic concept depends on the designation of a critical distance, d_c, defined as the distance beyond which no discernible increase in clustering of high or low values exists. In a series of simulation experiments LSM is compared to well‐known spatial weights matrix specifications—two different contiguity configurations, three different inverse distance formulations, and three semi‐variance models. The simulation experiments are carried out on a random spatial pattern and two types of spatial clustering patterns. The LSM performed best according to the Akaike Information Criterion, a spatial autoregressive coefficient evaluation, and Moran's I tests on residuals. The flexibility inherent in the LSM allows for its favorable performance when compared to the rigidity of the global models.