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1

Exploring the dynamics of monkeypox: a fractional order epidemic model approach

Baba Isa Abdullahi, Hincal Evren, Rihane Fathalla A.

Journal of Applied Mathematics and Computational Mechanics

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2024

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Vol. 23, nr 1

32-44

EN

We present a mathematical model employing nonlinear fractional differential equations to investigate the transmission of disease from rodents to humans. The existence and uniqueness of the model’s solutions are established through Banach contraction maps, and the local asymptotic stability of equilibrium solutions is confirmed. We calculate a critical parameter, the basic reproduction number, which reflects secondary infection rates. Numerical simulations illustrate dynamic changes over time, showcasing that our model provides a more comprehensive representation of the biological system compared to classical models.

2

Identifying the impact of generalization on maps of erosion dissection at different scales

Hodzinska Iryna, Hutsul Taras, Kazimir Ivan

Reports on Geodesy and Geoinformatics

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2023

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Vol. 115

1--8

EN

The issue of building thematic maps of erosion dissection, despite its wide demand in various fields of human activity (construction of hydraulic structures, transport and housing construction, agriculture), still has no clear rules and instructions, which causes different perceptions of the obtained mapping results by specialists. The purpose of the study is to experimentallyn identify the change in the index of erosive dissection depending on the scale of the initial data, the size of the cell, the method of constructing the thematic map, etc. The methods used in this research are the method of mathematical statistics, GIS mapping and modelling, spatial analysis, and change detection. For each of the selected methods of thematic mapping, we compiled the cartograms that allow the visual tracking of changes in the elements of the erosion network depending on the geometric characteristics of the scale and cell size. The dimensions and characteristics with optimal results were substantiated. The main feature of erosional dissection mapping of any territory is to detect the negative relief or concave upward forms. The result is a visual perception accompanied by the addition of numerical values. Estimation of erosion dissection by these methods was used in the construction of a thematic map of the foothill territory with a relatively homogeneous relief pattern. It should be noted that the change in the morphometric index happens simultaneously with the change in orographic features. Therefore, for areas with different forms of relief, the combination or use of only one of the above methods allows identifying the optimal and most accurate one among them. The use of well-established methods will facilitate the study of foothill plains or mountainous areas and will allow expanding the scope of the use of thematic maps for applied purposes and forecasting.

3

Industry and innovation in the Alto Minho region: assessing regional performance

Abreu Mariana, Rodrigues Helena Sofia, Silva Ângela, Garcia Jorge Esparteiro

Engineering Management in Production and Services

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2023

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Vol. 15, no. 2

72--82

EN

As a tool, the Sustainable Development Goals (SDG) guide local and regional leaders in developing policy approaches for better social development. SDGs are 17 ambitious objectives towards a greener, healthier, more peaceful and equal planet, promoted by the United Nations to achieve by 2030. Having this performance in mind, countries and regions can measure their level of SDG implementation and rethink how they could promote prosperity, cooperation among regions and progress. This study focuses on SDG-9: Industry, innovation and infrastructure in ten municipalities of the Alto Minho region, Portugal. The main idea is to assess the level of each municipality in the achievement of the indicators related to this SDG. The similarities and differences between the municipalities can underline areas for joint efforts or investments in the development policy. This paper selected a performance analysis as a tool for informing on the amount of effort required to achieve SDG-9 at a local level, i.e., the Alto Minho region in the north of Portugal. If the trend of evolution is maintained, only Viana do Castelo will reach the full range of indicators for SDG-9, and Caminha will have 50 % of the indicators achieved. The remaining municipalities will reach at least half of the indicators, thus achieving a value lower than half of the target value. This approach could be replicated in other SDGs and other regions. This assessment allows the region’s stakeholders to indicate areas of required action to achieve the SDG.

4

Modernist architecture in film

Nadolny Adam

Zeszyty Naukowe Politechniki Poznańskiej. Architektura, Urbanistyka, Architektura Wnętrz

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2022

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Z. 10

91--102

EN

This text presents concepts of mapping Modernist Polish architecture presented in the feature films of 1960s. The feature film became an ideal medium in the 1960s for presenting modernity in Poland, as perceived through new buildings erected with the observance of modern trends. The feature films of those times constitute research material, letting us see and grasp the atmosphere of the times through the perspective of modernity recorded in the film shots. An important aspect of the research is the way in which the mapping of movements, modern architecture and feature films can be combined.

PL

Niniejszy tekst przedstawia koncepcję mapowania polskiej architektury modernistycznej przedstawionej w filmach fabularnych z lat 60. XX wieku. Film fabularny stał się w latach 60 XX wieku, idealnym medium do prezentacji nowoczesności w Polsce, widzianej przez nowe budynki wznoszone z uwzględnieniem ówcześnie panujących trendów. Filmy fabularne z tamtych czasów stanowią materiał badawczy, pozwalający zobaczyć i uchwycić atmosferę tamtych czasów przez pryzmat nowoczesności zapisanej w kadrach filmowych. Ważnym aspektem badań jest sposób, w jaki można połączyć mapowanie, nowoczesną architekturę i filmy fabularne.

5

Challenges for Improving Agricultural Resilience in the Context of Sustainability and Rural Development

Morkunas Mangirdas, Žičkienė Agnė, Baležentis Tomas, Volkov Artiom, Štreimikienė Dalia, Ribašauskienė Erika

Problemy Ekorozwoju

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2022

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Vol. 17, nr 1

182--195

EN

Research on economic resilience in agriculture is quite complicated due to the interdisciplinary nature of the notion. In agricultural, climate change, sustainability and food security research it appears as an endogenous phenomenon rather as the main one. This study aims to contribute to conceptualization of economic resilience in agriculture, revealing current and identifying future research directions. Bibliometric analysis supplemented with a literature overview serve this purpose. Results confirm the ambiguity and immaturity of economic resilience concept and its secondary position within overall agricultural resilience research framework.

PL

Badania resilencji ekonomicznej w rolnictwie są dość skomplikowane ze względu na interdyscyplinarny charakter tego pojęcia. W badaniach dotyczących rolnictwa, zmian klimatycznych, zrównoważonego rozwoju i bezpieczeństwa żywności wydaje się, że jest to zjawisko endogeniczne, a nie główne. Niniejsze opracowanie ma na celu przyczynienie się do konceptualizacji resilencji ekonomicznej w rolnictwie, wskazując na obecne i identyfikując przyszłe kierunki badawcze. Służy temu analiza bibliometryczna uzupełniona przeglądem literatury. Wyniki potwierdzają niejednoznaczność i niedojrzałość koncepcji resilencji ekonomicznej oraz jej drugorzędną pozycję w ogólnych ramach badań resilencji rolnictwa.

6

The modelling of electric arc with stochastic disturbances. Part 1, The mapping of stochastic disturbances in mathematical models of electric arc

Sawicki Antoni

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2022

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Vol. 66, No. 6

47--64

EN

The heterogeneous physical structure of electric arc inspired a proposal to consider separately the generation of random disturbances of electric waveforms in the plasma column and in near-electrode areas. The article presents selected mathematical correlations which could be used to assess parameters of noisy signals in arc devices. Depending on the type of generated noise (white, pink, red), it is necessary to apply appropriate filters (which can be modelled using the ordinary differential equations presented in the article). The article discusses in detail the methods enabling the mapping of stochastic disturbances affecting the electric arc column. 1. By assuming specific systems of the physical effect of disturbances and thereby interfering in the input equation of energy balance it was possible to obtain the noisy Mayr-Voronin and Cassie-Voronin models of arc characterised by variable geometrical dimensions. 2. By assuming specific systems of the mathematical effect of parameter disturbances and thereby interfering in previously developed deterministic mathematical models it was possible to obtain the modified noisy Mayr, Cassie and Schwarz models as well as a model with the radius of a cylindrical column as a state variable. 3. The assumption of specific systems of the mathematical effect of disturbances on the deterministic load of the circuit with electric arc made it possible to consider macro-models with current or voltage noise generating sources additionally connected to arc.

7

A method for vehicle–track–soil interaction analysis considering soil deformation

Li Zheng, Xu Lei, Wang Weidong

Archives of Civil and Mechanical Engineering

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2022

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Vol. 22, no. 4

art. no. e210, 2022

EN

In this work, an engineering practical method is put forward to characterize the static and dynamic mapping relationship between soil deformation and its induced system performance. The main novelty lies in the achievement of mapping relationship analysis subject to arbitrary soil deformation-induced vehicle–track–soil (VTS) static geometric deformation and dynamic behavior. In this practical model, the increment and iteration methods are introduced and integrated into the static mapping analysis to solve the nonlinear interlayered contact and separation, and subsequently, to achieve dynamic mapping analysis under a VTS dynamics framework, besides, the Wavelet transform is applied to obtain the more distinct observation signal in the time domain. Apart from the discussion on the time domain, the analysis on the frequency domain is implemented in the numerical studies to further illustrate the influence of soil additional deformation from the dynamic mapping perspective. Moreover, the difference between the dynamic responses of the unit base plate and longitudinal connected base plate subject to different combination of wavelength and amplitude of soil deformation is analyzed.

8

On the applicability of integrated UAV photogrammetry and automatic feature extraction for cadastral mapping

Ajayi Oluibukun Gbenga, Oruma Emmanuel

Advances in Geodesy and Geoinformation

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2022

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Vol. 71, no. 1

art. no. e19, 2022

EN

The applicability of integratedUnmannedAerialVehicle (UAV)-photogrammetry and automatic feature extraction for cadastral or property mapping was investigated in this research paper. Multi-resolution segmentation (MRS) algorithm was implemented on UAVgenerated orthomosaic for mapping and the findings were compared with the result obtained from conventional ground survey technique using Hi-Target Differential Global Positioning System (DGPS) receivers. The overlapping image pairs acquired with the aid of a DJI Mavic air quadcopter were processed into an orthomosaic using Agisoft metashape software while MRS algorithm was implemented for the automatic extraction of visible land boundaries and building footprints at different Scale Parameter (SPs) in eCognition developer software. The obtained result shows that the performance of MRS improves with an increase in SP, with optimal results obtained when the SP was set at 1000 (with completeness, correctness, and overall accuracy of 92%, 95%, and 88%, respectively) for the extraction of the building footprints. Apart from the conducted cost and time analysis which shows that the integrated approach is 2.5 times faster and 9 times cheaper than the conventional DGPS approach, the automatically extracted boundaries and area of land parcels were also compared with the survey plans produced using the ground survey approach (DGPS) and the result shows that about 99% of the automatically extracted spatial information of the properties fall within the range of acceptable accuracy. The obtained results proved that the integration of UAVphotogrammetry and automatic feature extraction is applicable in cadastral mapping and that it offers significant advantages in terms of project time and cost.

9

Mapping Ghana by GMT and R scripting: advanced cartographic approaches to visualize correlations between the topography, climate and environmental setting

Lemenkova Polina

Advances in Geodesy and Geoinformation

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2022

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Vol. 71, no. 1

art. no. e16, 2022

EN

The applications of the machine learning and programming approaches in cartography has been increasing in recent years. This paper presents a case study of the scripting techniques used for cartographic mapping using Generic Mapping Tools (GMT) and R language (raster and tmaps packages). The aim of the study is environmental mapping of Ghana. The materials include high-resolution raster grids: topography by the General Bathymetric Chart of the Oceans (GEBCO), climate and environmental datasets (TerraClimate) and Shuttle Radar Topography Mission (SRTM) Digital Elevation Model (DEM) for geomorphometric analysis (slope, aspect, hillshade and elevations). The methodology includes code snippets commented and explained with details of scripts. It is argued that using consolebased scripting tools for mapping is effective for cartographic workflow due to the logical structure and repeatability of scripts. The results include eight new thematic maps of Ghana performed using scripting approach inGMTscripting toolset and R language for quantitative and qualitative environmental assessment. Maps show correlations between the landforms of Ghana and certain environmental variables (drought index and soil moisture) showing the effects of the topographic relief on the distribution of the continuous geographic fields. These varied in several geographically distinct regions of Ghana: Ashanti (Kumasi), Volta, Savannah, coastal and northern regions. Demonstrated maps show that scripting method works effectively on a wide range of geosciences including environmental, topographic and climate studies. In such a way, this paper contributes both to the regional studies of Ghana and development of cartographic techniques.

10

Spatial analysis of seasonal precipitation using various interpolation methods in the Euphrates basin, Turkey

Katipoğlu Okan Mert

Acta Geophysica

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2022

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Vol. 70, no 2

859--878

EN

It is vital to accurately map the spatial distribution of precipitation, which is widely used in many fields such as hydrology, climatology, meteorology, ecology, and agriculture. This study aimed to reveal the spatial distribution of seasonal, long-term average precipitation in the Euphrates Basin with various interpolation methods. For this reason, Simple Kriging, Ordinary Kriging, Universal Kriging, Ordinary CoKriging, Empirical Bayesian Kriging, Radial Basis Functions (Completely Regularized Spline, Thin Plate Spline, Multiquadratic, Inverse Multiquadratic, Spline with Tensor), Local Polynomial Interpolation, Global Polynomial Interpolation, and Inverse Distance Weighting methods have been applied in the Geographical Informa tion Systems environment. Long-term seasonal precipitation averages between 1966 and 2017 are presented as input for predicting precipitation maps. The accuracy of the precipitation prediction maps was based on linear regression analysis, root mean square error (RMSE), mean absolute error (MAE), correlation coefficient (R), and determination coefficient (R2 ) values obtained from the cross-validation tests. The most suitable method was chosen for the interpolation method that gives the lowest RMSE, MAE, and the largest R and R2 . As a result of the study, Ordinary CoKriging in spring and winter precipitation, Local Polynomial Interpolation in summer precipitation, and Ordinary Kriging in autumn precipitation were the most appropriate estimation methods.

11

Inertial shrinking projection algorithm with self-adaptive step size for split generalized equilibrium and fixed point problems for a countable family of nonexpansive multivalued mappings

Olona Musa A., Alakoya Timilehin O., Owolabi Abd-semii O.-E., Mewomo Oluwatosin T.

Demonstratio Mathematica

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2021

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Vol. 54, nr 1

47--67

EN

In this paper, we introduce a shrinking projection method of an inertial type with self-adaptive step size for finding a common element of the set of solutions of a split generalized equilibrium problem and the set of common fixed points of a countable family of nonexpansive multivalued mappings in real Hilbert spaces. The self-adaptive step size incorporated helps to overcome the difficulty of having to compute the operator norm, while the inertial term accelerates the rate of convergence of the proposed algorithm. Under standard and mild conditions, we prove a strong convergence theorem for the problems under consideration and obtain some consequent results. Finally, we apply our result to solve split mixed variational inequality and split minimization problems, and we present numerical examples to illustrate the efficiency of our algorithm in comparison with other existing algorithms. Our results complement and generalize several other results in this direction in the current literature.

12

Historia regionalnych badań geologicznych Oddziału Dolnośląskiego PIG-PIB we Wrocławiu oraz perspektywy na najbliższe lata

Cymerman Zbigniew

Przegląd Geologiczny

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2020

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Vol. 68, nr 5

378--386

EN

The specificity of the activities of the Lower Silesian Branch of the Polish Geological Institute - National Research Institute (PGI-NRI) is due to main factors: (1) mosaic-like geological structure of Lower Silesia, (2) the wealth of various mineral resources, (3) centuries-old mining traditions of the region. Initially, the researches included mainly geological cartography, subsequently expanding the scope of work to include regional (structural) geology and deposit geology. The contribution of applied geology, especially hydrogeology and environmental geology, has increased significantly in the previous decades. Three chapters present different periods of the Lower Silesian Branch of the PGI-NRI with its most important milestones for the Polish geology in the last seven decades. This division includes three periods: (1) years of development (1949-1989); (2) years of stagnation (1989-2013), and (3) years of disorganization (2014-2019). The period of intensification of geological researches carried out by the Lower Silesian Branch of the PGI-NRI lasted until the years of the so-called system transformation. During that period, the programs of deep boreholes were finished. In the 1990s, detailed cartographic works in Lower Silesia were completed. Acute shortage of new factographic material caused the necessity to analyze the archival material stored during previous decades at the Lower Silesian Branch. In 2014, it has practically decommissioned the regional branches, including the Lower Silesian Branch. Full centralization has led to the liquidation of both the branches’ independence and their previous focus on the implementation of tasks related to the specificity of a given region. In the forthcoming future, new challenges would depend on a proper organization chart of the PGI-NRI and the position of the regional branches in this scheme.

13

Topographic surface modelling using raster grid datasets by GMT: example of the Kuril-Kamchatka Trench, Pacific Ocean

Lemenkova Polina

Reports on Geodesy and Geoinformatics

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2019

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Vol. 108

9--22

EN

The study area is focused on the Kuril–Kamchatka Trench, North Pacific Ocean. This region is geologically complex, notable for the lithosphere activity, tectonic plates subduction and active volcanism. The submarine geomorphology is complicated through terraces, slopes, seamounts and erosional processes. Understanding geomorphic features of such a region requires precise modelling and effective visualization of the high-resolution data sets. Therefore, current research presents a Generic Mapping Tools (GMT) based algorithm proposing a solution for effective data processing and precise mapping: iterative module-based scripting for the automated digitizing and modelling. Methodology consists of the following steps: topographic mapping of the raster grids, marine gravity and geoid; semi-automatic digitizing of the orthogonal cross-section profiles; modelling geomorphic trends of the gradient slopes; computing raster surfaces from the xyz data sets by modules nearneighbor and XYZ2grd. Several types of the cartographic projections were used: oblique Mercator, Mercator cylindrical, conic equal-area Albers, conic equidistant. The cross-section geomorphic profiles in a perpendicular direction across the two selected segments of the trench were automatically digitized. Developed algorithm of the semi-automated digitizing of the profiles enabled to visualize gradients of the slope steepness of the trench. The data were then modelled to show gradient variations in its two segments. The results of the comparative geomorphic analysis of northern and southern transects revealed variations in different parts of the trench. Presented research provided more quantitative insights into the structure and settings of the submarine landforms of the hadal trench that still remains a question for the marine geology. The research demonstrated the effectiveness of the GMT: a variety of modules, approaches and tools that can be used to produce high-quality mapping and graphics. The GMT listings are provided for repeatability.

14

Management of hazard of flooding in arid region urban agglomeration using HEC-RAS and GIS software: The case of the Bechar's city

Bekhira Abdelghani, Habi Mohamed, Morsli Boutkhil

Journal of Water and Land Development

|

2019

|

no. 42

21--32

PL

W ostatnich latach miasto Bechar w Algierii doświadczyło kilku ekstremalnych zjawisk powodziowych, np. w 2008 r. z przepływem 830 m3∙s–1 (hwody = 4 m, b = 200 m) po wyjątkowo dużych opadach deszczu. Podobne powodzie wystąpiły w latach 2012 i 2014. Problemem jest fakt, że miasto Bechar rozciąga się do brzegów Wadi Bechar, co stwarza poważne zagrożenie dla życia mieszkańców regionu. W niniejszej pracy oszacowano zagrożenie powodzią poprzez mapowanie ryzyka. Ta metoda polega na określeniu wartości przepływu z okresem powtarzalności 25 lat (Q25 = 388,6 m3∙s–1, hwody = 3,5 m, b = 200 m, Szagr. = 55,35 ha), 50 lat (Q50 = 478,3 m3∙s–1wody = 5 m, b = 200 m, Szagr. = 66,48 ha) i 100 lat (Q100 = 567,3 m3∙s–1, hwody = 7 m, b = 200 m, Szagr. = 133 ha). Do mapowania zjawiska należy dostosować wartości przepływów z wykorzystaniem prawa Gumbela za pomocą programów komputerowych HEC-RAS, HEC-GeoRAS i ArcGIS. Niniejsza praca umożliwia określenie stref narażonych na ryzyko powodzi i ich klasyfikację w zależności od wysokości fali powodziowej.

EN

During the last few years, the City of Bechar in Algeria has witnessed some extreme events, such as the great flood of the year 2008 in which an exceptional amount of rain was recorded with a flow rate of 830 m3∙s–1 (hwater = 4 m, b = 200 m); similar flooding also occurred in 2012 and 2014. The problem is that most of the City of Bechar has an urban sprawl that extends to the banks of Wadi Bechar, which represents a huge risk for the lives of the inhabitants of the region. The present work aims to assess the flood risk through flood hazard mapping. This method consists in determining the flow rates for the return periods of 25 years (Q25 = 388.6 m3∙s–1, hwater = 3.5 m, b = 200 m, Sspot = 55.35 ha), 50 years (Q50 = 478.3 m3∙s–1, hwater = 5 m, b = 200 m, Sspot = 66.48 ha) and 100 years (Q100 = 567.3 m3∙s–1, hwater = 7 m, b = 200 m, Sspot = 133 ha). For this, it is necessary to adjust the flow rates using Gumbel law along with some computer supports such as HEC-RAS, HEC- -GeoRAS and ArcGis for mapping the event. Finally, this work enables us to determine the zones exposed to risk of flooding and to classify them according to the flood water height.

15

A self adaptive inertial subgradient extragradient algorithm for variational inequality and common fixed point of multivalued mappings in Hilbert spaces

Jolaoso Lateef Olakunle, Taiwo Adeolu, Alakoya Timilehin Opeyemi, Mewomo Oluwatosin Temitope

Demonstratio Mathematica

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2019

|

Vol. 52, nr 1

183--203

EN

We consider a new subgradient extragradient iterative algorithm with inertial extrapolation for approximating a common solution of variational inequality problems and fixed point problems of a multivalued demicontractive mapping in a real Hilbert space. We established a strong convergence theorem for our proposed algorithm under some suitable conditions and without prior knowledge of the Lipschitz constant of the underlying operator. We present numerical examples to show that our proposed algorithm performs better than some recent existing algorithms in the literature.

16

Elastic–slip interface effect on effective elastic modulus of elliptical-fiber reinforced asphalt concrete with large deformation

Fang Xue-Qian, Tian Jia-Yan, Yang Shao-Pu, Li Bai-Lin

Archives of Civil and Mechanical Engineering

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2019

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Vol. 19, no. 3

707--715

EN

An elastic–slip interface model is proposed to investigate the effective elastic modulus of elliptical-fiber reinforced asphalt concrete, and the nonlinear factor related with the second-order term of strain is used to consider the large deformation of asphalt concrete. The representative volume element with effective isotropic medium is introduced to describe the overall properties of elliptical-fiber reinforced asphalt concrete. Combining the confor-mal mapping technique and polynomial function expanded method, a closed form solution of effective elastic modulus is obtained. Through numerical examples, the effects of inter-face material coefficients and the nonlinear factor on the effective elastic modulus under different shapes of fibers are discussed in detail. To validate the present interface model, experimental investigation on the interface effect on the elastic modulus is presented.

17

Mapping of relational structures in graph database Neo4j

Mueller W., Idziaszek P., Kujawa S., Łukomski M., Nowak P.

Journal of Research and Applications in Agricultural Engineering

|

2018

|

Vol. 63, nr 4

121--124

EN

Extension of functionality of most applications including the ones supporting agriculture, as a general rule requires an indepth knowledge of relational structures creating databases, which can be sometimes difficult to achieve. It can result from the lack of complete technical documentation as well as relatively huge complexity of relational structures. The given publication is a continuation of the author’s actions, aimed at creating a moderately universal application allowing to reproduce the existing relational structures created with the use of different relational database management systems (RDBMS), namely SQL Server, MySQL or Oracle into graph form on the level of Neo4j graph database. This form makes it possible to thoroughly recognize complex relational structures with the use of queries prepared in Cypher language in native client, which is made available from the level of the created application. During the construction process of the presented tool, technologies such as ADO.NET, graph database Neo4j together with available programming interface as well proper tables containing metadata were utilized.

PL

Rozbudowa funkcjonalności większości aplikacji, w tym również wspomagających rolnictwo z reguły wymaga pełnej znajomości struktur relacyjnych tworzących bazy danych, co czasami może być trudne do osiągnięcia. Powodem może być brak pełnej dokumentacji technicznej oraz względnie duża złożoność struktur relacyjnych. Prezentowana publikacja, to kontynuacja działań autorów, zmierzająca do wytworzenia w miarę uniwersalnej aplikacji, pozwalającej na odwzorowanie istniejących struktur relacyjnych, powstałych przy wykorzystaniu różnych systemów bazodanowych SQL Server, MySQL oraz Oracle, do postaci grafowej na poziomie Neo4j. Ta postać umożliwia wygodne, dogłębne rozpoznawanie złożonej struktury relacyjnej za pomocą pytań konstruowanych w języku Cypher w natywnym programie klienckim udostępnianym z poziomu prezentowanej aplikacji. W procesie budowy prezentowanego narzędzia wykorzystano technologie ADO.NET, bazę grafową Neo4j wraz z dostępnym interfejsem programistycznym oraz odpowiednie tabele zawierające metadane.

18

Monitoring of secondary forest succession on abandoned farmland using LiDAR point clouds

Szostak M., Bednarski A., Wężyk P.

Geodesy and Cartography

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2018

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Vol. 67, no. 2

305--319

EN

The purpose of the study was an assessment of LiDAR point clouds for automating the mapping of land use and land cover changes, mainly land abandonment and the process of secondary forest succession. Detailed information about land cover was determined based on airborne laser scanning data. The presented study focuses on the analysis of the spatial range and structure of vegetation. The study area was located in Milicz district in the voivodeship of Lower Silesia – the central west part of Poland. The areas of interest were parcels where agricultural land had been abandoned and forest succession processes had progressed. Analysis of the spatial range of the secondary forest succession was carried out using a reclassified nDSM. Reclassification of the nDSM was done using > 1 m, > 2 m and > 3 m for the pixel values, representing the height of vegetation above the ground. Parameters such as height of vegetation, standard deviation of height and cover density were calculated, to show the process of the increase in forest succession on abandoned agricultural land. The results confirmed a discrepancy between the cadastral data and the actual use of the plots. In the study area, more than three times as much forested and wooded area was detected than had been recorded in official databases. Analyses based on airborne laser scanning point clouds indicated significant diversity in the vertical and horizontal structure of vegetation. The results demonstrated gradual succession of greenery in the research area.

19

Analysis of errors in the creation and updating of digital topographic maps

Yartseva V., Besimbaeva O., Khmyrova E.

Geodesy and Cartography

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2018

|

Vol. 67, no. 1

143--151

EN

This article analyzes the technology of creating and updating a digital topographic map using the method of mapping (generalization) on an updated map with a scale of 1 : 25;000 based on the source cartographic material. The main issue in the creation of digital maps is the study of map production accuracy and error analysis arising from the process of map production. When determining the quality of a digital map, the completeness and accuracy of object and terrain mapping are evaluated. The correctness of object identification, the logical consistency of the structure, the and representation of objects are assessed. The main and the most effective method, allowing to take into account displacement errors for the relief during image processing, is orthotransformation, but the fragment used to update the digital topographic map needs additional verification of its compliance with the scale requirements of the map. Instrumental survey will help to clearly identify areas of space image closer to nadir points and to reject poor quality material. The software used for building geodetic control network should provide stable results of accuracy regardless on the scale of mapping, the physical and geographical conditions of the work area or the conditions of aerial photography.

20

Studying OpenMP thread mapping for parallel linear algebra kernels on multicore system

Bylina B., Bylina J.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2018

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Vol. 66, nr 6

981--990

EN

Thread mapping is one of the techniques which allow for efficient exploiting of the potential of modern multicore architectures. The aim of this paper is to study the impact of thread mapping on the computing performance, the scalability, and the energy consumption for parallel dense linear algebra kernels on hierarchical shared memory multicore systems. We consider the basic application, namely a matrix-matrix product (GEMM), and two parallel matrix decompositions (LU and WZ). Both factorizations exploit parallel BLAS (basic linear algebra subprograms) operations, among others GEMM. We compare differences between various thread mapping strategies for these applications. Our results show that the choice of thread mapping has the measurable impact on the performance, the scalability, and energy consumption of the GEMM and two matrix factorizations.