三维模型数据质量分析与控制方法研究     

薛萍  董翠珠 《现代测绘》2011,34(4):55-56

本文主要介绍了三维模型数据的内容,分析了基于数字摄影测量方式的三维模型数据的质量分析与控制,并总结了实际生产过程中特殊问题的处理方法。  相似文献   

测量监理信息管理系统设计与实现     

王昌洪 《测绘与空间地理信息》2011,34(1):89-91

测量监理信息管理系统是工程测量监理现代化的趋势。在分析目前工程测量监理实际的基础上,提出了系统设计思想、软硬件开发环境、系统功能的设计方法。该系统的设计与实现将对工程测量监理的质量、工期、投资控制等起到一定的促进作用。  相似文献   

监理在第二次全国土地调查中的作用     

冀耀宇  唐立哲  常美 《测绘与空间地理信息》2011,34(3):226-227,230

着重论述了第二次全国土地调查工作中项目监理的职责、质量保障措施及实施.通过论述说明第二次全国土地调查工作引入项目监理机制的必要性和作用.  相似文献   

质量管理体系在测绘单位应用的探索     

周密 《测绘与空间地理信息》2011,34(4):257-259

介绍质量管理体系在我院运行的概况,阐述了根据ISO 900 1∶2008的要求对原有质量管理体系文件进行修改的情况,根据多年来实际工作经验探讨了在质量管理体系运行过程中的体会及改进方向。  相似文献   

Soil quality and human migration in Kenya and Uganda     

Clark L. Gray 《Global Environmental Change》2011,21(2):421-430

Soil degradation is widely considered to be a key factor undermining agricultural livelihoods in the developing world and contributing to rural out-migration. To date, however, few quantitative studies have examined the effects of soil characteristics on human migration or other social outcomes for potentially vulnerable households. This study takes advantage of a unique longitudinal survey dataset from Kenya and Uganda containing information on household-level soil properties to investigate the effects of soil quality on population mobility. Random effects multinomial logit models are used to test for effects of soil quality on both temporary and permanent migration while accounting for a variety of potential confounders. The analysis reveals that soil quality significantly reduces migration in Kenya, particularly for temporary labor migration, but marginally increases migration in Uganda. These findings are consistent with several previous studies in showing that adverse environmental conditions tend to increase migration but not universally, contrary to common assumptions about environmentally-induced migration.  相似文献   

Spatial patterns of chemical contamination (metals, PAHs, PCBs, PCDDs/PCDFS) in sediments of a non-industrialized but densely populated coral atoll/small island state (Bermuda)     

Jones RJ 《Marine pollution bulletin》2011,62(6):1362-1376

There is a recognized dearth of standard environmental quality data in the wider Caribbean area, especially on coral atolls/small island states. Extensive surveys of sediment contamination (n = 109 samples) in Bermuda revealed a wide spectrum of environmental quality. Zinc and especially copper levels were elevated at some locations, associated with boating (antifouling paints and boatyard discharges). Mercury contamination was surprisingly prevalent, with total levels as high as 12 mg kg⁻¹ DW, although methyl mercury levels were quite low. PAH, PCB and PCDD/PCDF contamination was detected a several hotspots associated with road run-off, a marine landfill, and a former US Naval annexe. NOAA sediment quality guidelines were exceeded at several locations, indicating biological effects are possible, or at some locations probable. Overall, and despite lack of industrialization, anthropogenic chemicals in sediments of the atoll presented a risk to benthic biodiversity at a number of hotspots suggesting a need for sediment management strategies.  相似文献   

Pathogenic fungi: an unacknowledged risk at coastal resorts? New insights on microbiological sand quality in Portugal     

Sabino R  Veríssimo C  Cunha MA  Wergikoski B  Ferreira FC  Rodrigues R  Parada H  Falcão L  Rosado L  Pinheiro C  Paixão E  Brandão J 《Marine pollution bulletin》2011,62(7):1506-1511

Whilst the potential impact on beach users from microorganisms in water has received considerable attention, there has been relatively little investigation into microbial contaminants in sand. Thirty three beaches across Portugal were analyzed during a five year period (2006-2010) to determine the presence of yeasts, pathogenic fungi, dermatophytes, total coliforms, Escherichia coli and intestinal enterococci in sand.Our results showed that 60.4% of the samples were positive for fungi and that 25.2% were positive for the bacterial parameters. The most frequent fungal species found were Candida sp. and Aspergillus sp., whereas intestinal enterococci were the most frequently isolated bacteria. Positive associations were detected among analyzed parameters and country-regions but none among those parameters and sampling period.Regarding threshold values, we propose 15 cfu/g for yeasts, 17 cfu/g for potential pathogenic fungi, 8 cfu/g for dermatophytes. Eighty four cfu/g for coliforms, 250 cfu/g for E. coli, and 100 cfu/g for intestinal enterococci.  相似文献   

Critical appraisal on the identification of Reference Conditions for the evaluation of ecological quality status along the Emilia-Romagna coast (Italy) using M-AMBI   总被引：1，自引：0，他引：1  

Paganelli D  Forni G  Marchini A  Mazziotti C  Occhipinti-Ambrogi A 《Marine pollution bulletin》2011,62(8):1725-256

According to the European Water Framework Directive, the ecological status (ES) of a water body is determined by comparing observation data with undisturbed Reference Conditions (RCs). Defining RCs is crucial when evaluating the ES of a water body as it strongly affects the final outcome of any index application. Identifying RCs by observing real sites is not feasible in many marine environments, such as the Emilia-Romagna coast (Italy, N-Adriatic Sea). We used a statistical approach on a large dataset to derive RCs for the application of the benthic index M-AMBI in this area. We then applied M-AMBI to samples collected along a gradient of presumed environmental disturbance. The results put 14.8% of the Emilia-Romagna samples in “High” ES, 60.2% in “Good”, 23.0% in “Moderate” and 2.0% in “Poor”, showing a spatial gradient of improving quality. These results are in agreement with the extensive ecological knowledge available for this area.  相似文献   

Do benthic biofilters contribute to sustainability and restoration of the benthic environment impacted by offshore cage finfish aquaculture?     

Aguado-Giménez F  Piedecausa MA  Carrasco C  Gutiérrez JM  Aliaga V  García-García B 《Marine pollution bulletin》2011,62(8):1714-1724

Benthic biofilters were deployed under a cage fish farm and in two reference locations to assess the influence of the farm on the biofilters and the surroundings, as well as to verify the usefulness of this technology as a mitigation tool. The biofilters underneath the farm recruited a fouling community practically identical to that of the control biofilters, which included a variety of trophic strategies. The former showed a higher ¹⁵N enrichment, indicating that fouling beneath the farm was benefiting from the farm waste. The waste retention efficiency was low (0.02 g N m⁻² month⁻¹) beneath the farm. Benthic biofilters aggregated demersal wild fish around and within them. Pelagic wild fish also frequently used the biofilters beneath the farm, forming compact shoals around them. The increased complexity of the habitat below the fish farm enhanced biodiversity, but this improvement did not lead to the recovery of the sediments around the biofilters.  相似文献   

Polychaete/amphipod ratio as an indicator of environmental impact related to offshore oil and gas production along the Norwegian continental shelf     

Andrade H  Renaud PE 《Marine pollution bulletin》2011,62(12):2836-2844

Benthic faunal data is regularly collected worldwide to assess the ecological quality of marine environments. Recently, there has been renewed interest in developing biological indices able to identify environmental status and potential anthropogenic impacts. In this paper we evaluate the performance of a general polychaete/amphipod ratio along the Norwegian continental shelf as an environmental indicator for offshore oil and gas impacts. Two main trends are apparent: first, a contamination gradient is discernible from where production takes place compared to stations 10,000 m away. Second, the quality of the marine environment has improved over time. These results are consistent with monitoring reports employing a combination of uni- and multi-variate statistics. Thus, we consider this ratio as a relatively simple, useful and potentially cost-effective complement to other more demanding assessment techniques. Because of its strong theoretical basis, it may also be useful for detecting ecological change as a result of other activities.  相似文献