Understanding the rates of expansion of the farming system in Europe

If the overall expansion of the farming system was determined by the Neolithic Demographic Transition (NDT), i.e. by demographic pressure, what determined the rate of expansion? What is the link between the rate of expansion, the farming system and demographic density? In a first approach, the issue of the different rates of expansion of the farming system on the map is addressed in terms of 21 geo-ecological, climatic and cultural factors and forager populations, via an ordinary least square regression technique (OLS). In a second approach, the variability of the rate of expansion is analyzed in terms of specific patterns identified for the ceramic culture areas, via a cluster analysis. The expansion rate is negatively correlated with the intensification of the agricultural system, as well as with demographic density. Expansion is slow in ecosystems with an intensive farming system with relatively high demographic density, and vice-versa.     

Pastoralism and Protected Area Management in Mongolia's Gobi Gurvansaikhan National Park

The Gobi Gurvansaikhan National Park was established in south central Mongolia in 1993 and is used by over 1100 families with pastoralism as their main means of livelihood. Research conducted in 1998–2000 to analyse grazing management problems identified a number of issues and concerns, including a significant increase in the number of herders and the size of the herd; variations in herd size reflecting differences in wealth; problems with marketing of livestock or livestock products; declining stock movements because of transportation costs and loss of water sources; and significant competition and conflicts for grazing areas. The socio‐economic problems associated with Mongolia's transition to a market system, coupled with the expansion of protected areas, mean that herders have to adapt to both the current economic system and changes in land use. Although some aspects of the development of the park can be seen as a positive influence on maintaining pastoral livelihoods in this area, the national goal of protecting 30 per cent of the country, doubling the area of Mongolia currently under protected area status, could have negative effects on pastoral livelihoods, unless ministry officials, protected area administrators and pastoralists can work effectively to solve resource problems.     

A Map Overlay Error Model Based on Boundary Geometry

An error model for quantifying the magnitudes and variability of errors generated in the areas of polygons during spatial overlay of vector geographic information system layers is presented. Numerical simulation of polygon boundary displacements was used to propagate coordinate errors to spatial overlays. The model departs from most previous error models in that it incorporates spatial dependence of coordinate errors at the scale of the boundary segment. It can be readily adapted to match the scale of error–boundary interactions responsible for error generation on a given overlay. The area of error generated by overlay depends on the sinuosity of polygon boundaries, as well as the magnitude of the coordinate errors on the input layers. Asymmetry in boundary shape has relatively little effect on error generation. Overlay errors are affected by real differences in boundary positions on the input layers, as well as errors in the boundary positions. Real differences between input layers tend to compensate for much of the error generated by coordinate errors. Thus, the area of change measured on an overlay layer produced by the XOR overlay operation will be more accurate if the area of real change depicted on the overlay is large. The model presented here considers these interactions, making it especially useful for estimating errors studies of landscape change over time.     

Book reviews

The Restless Urban Landscape. Paul L. Knox (Ed.), New Jersey, Prentice Hall, 1993, 285pp.

Towards a New Economic Order: Postfordism, Ecology and Democracy. Alain Lipietz, Cambridge, Polity Press, 1992, 206pp.

London: A New Metropolitan Geography. Keith Hoggart and David R. Green (Eds), London, Edward Arnold, 1992, pbk.

Regional Innovation Policy: Case‐studies from the Ruhr Area, Baden‐Württemberg and the North East of England. Robert Hassink, Faculteit Ruimtelijke Wetenschappen Rijksuniversiteit, 1992, 187pp., ISBN 90–6809–155–7.

Environmental Problems in Eastern Europe. F. W. Carter and D. Turnock (Eds), London, Routledge, 1993, 249 pp., ISBN 0–415–06229–2.

From Garden Cities to New Towns: Campaigning for town and Country Planning 1899–1946.. Dennis Hardy, London, E. and F. N. Spon, 1992, 340pp., £39.95 hbk.     

Spatial Causality: A Systematic Review on Spatial Causal Inference

The growing interest in causal inference in recent years has led to new causal inference methodologies and their applications across disciplines and research domains. Yet, studies on spatial causal inference are still rare. Causal inference on spatial processes is faced with additional challenges, such as spatial dependency, spatial heterogeneity, and spatial effects. These challenges can lead to spurious results and subsequently, incorrect interpretations of the outcomes of causal analyses. Recognizing the growing importance of causal inference in the spatial domain, we conduct a systematic literature review on spatial causal inference based on a formal concept mapping. To identify how to assess and control for the adverse effects of spatial influences, we assess publications relevant to spatial causal inference based on criteria relating to application discipline, methods used, and techniques applied for managing issues related to spatial processes. We thus present a snapshot of state of the art in spatial causal inference and identify methodological gaps, weaknesses and challenges of current spatial inference studies, along with opportunities for future research.     

Spatial cooperation patterns and their impact on innovation outcomes: lessons from firms in a low-technology region

This paper examines cooperation patterns of firms in the German low-technology region of Lower Bavaria. Particular emphasis is placed on the interplay among the spatial scale of cooperation, the form of cooperation and the type of innovation. Generic results show that overall, firms with a spatially more diverse set of cooperation linkages have a higher likelihood of innovating. However, the innovation outcomes differ depending on the spatial scale of cooperation. While cooperation with regional partners positively correlates with low-threshold innovations, cooperation with spatially distant partners positively correlates with product innovations. Surprisingly, it is application-oriented cooperation that channels the relation in both cases. The findings support the view that innovation of firms in low-technology regions is driven by ‘development’ rather than ‘research’. It also suggests that innovation-driven growth may even be possible in regions with limited values on the traditional innovation-supporting factors.     

The ‘Sand-Bath’ and Lithic Heat Treatment in the South African Middle Stone Age: Myth or Reality?

When heat treatment of silcrete for stone knapping was first discovered in the South African Middle Stone Age (MSA), the procedure used for it was suggested to be similar to the one used for heat treatment of finer rocks in other parts of the world: slow sand-bath heating. This comparison may have been based on published data from the fields of ethnography, experimentation and archaeology, describing sand-bath like structures and processes. In this review, I discuss whether the available data from these three fields indeed justify the suggestions that sand-bath heating was used in the context of MSA silcrete heat treatment. A careful revaluation of the available data shows that, although sand-bath heating is a widely accepted procedure that is documented in other parts of the world, understanding the earliest known cases of heat treatment in the MSA calls for another technical procedure.