scholarly journals DSM Generation from Single and Cross-Sensor Multi-View Satellite Images Using the New Agisoft Metashape: The Case Studies of Trento and Matera (Italy)

2021 ◽  
Vol 13 (4) ◽  
pp. 593
Author(s):  
Lorenzo Lastilla ◽  
Valeria Belloni ◽  
Roberta Ravanelli ◽  
Mattia Crespi
Keyword(s):  
Case Studies ◽  
Accuracy Assessment ◽  
Stereo Pair ◽  
Commercial Software ◽  
Processing Module ◽  
Land Covers ◽  
Image Metadata ◽  
The Impact ◽  
The City ◽  
Reliable Software

DSM generation from satellite imagery is a long-lasting issue and it has been addressed in several ways over the years; however, expert and users are continuously searching for simpler but accurate and reliable software solutions. One of the latest ones is provided by the commercial software Agisoft Metashape (since version 1.6), previously known as Photoscan, which joins other already available open-source and commercial software tools. The present work aims to quantify the potential of the new Agisoft Metashape satellite processing module, considering that to the best knowledge of the authors, only two papers have been published, but none considering cross-sensor imagery. Here we investigated two different case studies to evaluate the accuracy of the generated DSMs. The first dataset consists of a triplet of Pléiades images acquired over the area of Trento and the Adige valley (Northern Italy), which is characterized by a great variety in terms of geomorphology, land uses and land covers. The second consists of a triplet composed of a WorldView-3 stereo pair and a GeoEye-1 image, acquired over the city of Matera (Southern Italy), one of the oldest settlements in the world, with the worldwide famous area of Sassi and a very rugged morphology in the surroundings. First, we carried out the accuracy assessment using the RPCs supplied by the satellite companies as part of the image metadata. Then, we refined the RPCs with an original independent terrain technique able to supply a new set of RPCs, using a set of GCPs adequately distributed across the regions of interest. The DSMs were generated both in a stereo and multi-view (triplet) configuration. We assessed the accuracy and completeness of these DSMs through a comparison with proper references, i.e., DSMs obtained through LiDAR technology. The impact of the RPC refinement on the DSM accuracy is high, ranging from 20 to 40% in terms of LE90. After the RPC refinement, we achieved an average overall LE90 <5.0 m (Trento) and <4.0 m (Matera) for the stereo configuration, and <5.5 m (Trento) and <4.5 m (Matera) for the multi-view (triplet) configuration, with an increase of completeness in the range 5–15% with respect to stereo pairs. Finally, we analyzed the impact of land cover on the accuracy of the generated DSMs; results for three classes (urban, agricultural, forest and semi-natural areas) are also supplied.

scholarly journals Geometric Accuracy Assessment of Deimos-2 Panchromatic Stereo Pairs: Sensor Orientation and Digital Surface Model Production

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7234
Author(s):  
Manuel A. Aguilar ◽  
Rafael Jiménez-Lao ◽  
Abderrahim Nemmaoui ◽  
Fernando J. Aguilar
Keyword(s):  
Urban Areas ◽  
Satellite Images ◽  
Accuracy Assessment ◽  
Bare Soil ◽  
Surface Model ◽  
Stereo Pair ◽  
Rational Polynomial ◽  
Sensor Orientation ◽  
Vertical Accuracy ◽  
Land Covers

Accurate elevation data, which can be extracted from very high-resolution (VHR) satellite images, are vital for many engineering and land planning applications. In this way, the main goal of this work is to evaluate the capabilities of VHR Deimos-2 panchromatic stereo pairs to obtain digital surface models (DSM) over different land covers (bare soil, urban and agricultural greenhouse areas). As a step prior to extracting the DSM, different orientation models based on refined rational polynomial coefficients (RPC) and a variable number of very accurate ground control points (GCPs) were tested. The best sensor orientation model for Deimos-2 L1B satellite images was the RPC model refined by a first-order polynomial adjustment (RPC1) supported on 12 accurate and evenly spatially distributed GCPs. Regarding the Deimos-2 based DSM, its completeness and vertical accuracy were compared with those obtained from a WorldView-2 panchromatic stereo pair by using exactly the same methodology and semiglobal matching (SGM) algorithm. The Deimos-2 showed worse completeness values (about 6% worse) and vertical accuracy results (RMSEZ 42.4% worse) than those computed from WorldView-2 imagery over the three land covers tested, although only urban areas yielded statistically significant differences (p < 0.05).

Poets, Wrestlers and Cricketers

2017 ◽  
Author(s):  
Ian Talbot ◽  
Tahir Kamran
Keyword(s):  
Middle Class ◽  
Case Studies ◽  
North India ◽  
Government College ◽  
Colonial Rule ◽  
Local Institutions ◽  
Colonial Era ◽  
Key Participants ◽  
The Impact ◽  
The City

Chapter four discusses the impact of colonial rule on traditional cultural and sporting pastimes and the new activities that emerged, most notably cricket. There are three case studies of mushairas (poetic contests), wrestling and cricket. The chapter reveals how their key participants in Lahore were able to perform on a wider stage because of the communications revolution. Nonetheless, they remained rooted in the mohallas and local institutions of the city. Lahore’s mushairas of the 1870s which received contributions from Muhammad Hussain Azad and Altaf Hussain Hali are seen as possessing an important impact on the evolution of Urdu poetry in North India. Competitions took Lahore’s most famous wrestler Gama from his akhara (wrestling arena) in the city to England. Many of Lahore’s most famous colonial era cricketers lived in the Bhati Gate and Mochi Gate area. The fierce rivalry in the 1920s and 1930s between Islamia College and Government College drew talent from across the Punjab. Cricket was not divided on communal lines, Lala Amarnath the future Indian test captain who toured England in the 1930s played for the Crescent Club based at Minto Park which was patronized by the middle class Rana family of the Mochi Gate locality.

scholarly journals 3D GLACIER MAPPING BY MEANS OF SATELLITE STEREO IMAGES: THE BELVEDERE GLACIER CASE STUDY IN THE ITALIAN ALPS

2020 ◽  
Vol XLIII-B2-2020 ◽  
pp. 1073-1079
Author(s):  
F. Giulio Tonolo ◽  
A. Cina ◽  
A. Manzino ◽  
M. Fronteddu
Keyword(s):  
Accuracy Assessment ◽  
Control Point ◽  
Surface Model ◽  
Stereo Pair ◽  
Italian Alps ◽  
Positional Accuracy ◽  
Multi Temporal ◽  
Fit For Purpose ◽  
The Impact

Abstract. The authors group is within the Glacier Lab of Politecnico di Torino (part of the CC-LAB, a laboratory for climate change monitoring), which is working on glacier monitoring since 2016, mainly exploiting Geomatics techniques to measure the extent and to model the surface of glaciers over the years. Measurement campaigns were carried out within the ASP (Alta Scuola Politecnica – Poliecnico di Torino e Milano) DREAM projects (Drone tEchnnology for wAter resources and hydrologic hazard Monitoring) The manuscript is focused on a specific case study related to the Belvedere glacier, a valley glacier located in northern Italy.In the framework of the Belvedere glacier monitoring, several Geomatics approaches have already been applied in the last four years by the cc-glacier-lab and DREAM Projects with the goal to monitor both the extent of the glacier and its surface. Such monitoring enables the multi-temporal comparison of the glacier digital surface model (DSM), highlighting areas of ice loss and gain. Considering the limitations of aerial surveys in high altitude environments, the authors started assessing the suitability of a satellite based approach, mainly focusing on positional accuracy assessment. The paper is focused on a monitoring based on a high resolution (0.5 m) satellite optical stereo pair. Several tests were carried out with the goal to test the 3D positional accuracies, assessing the impact of different configurations of Ground Control Point (GCP) in terms of numerosity and distribution and focusing on the DSM validation. The results demonstrated the fit-for-purpose of a satellite-based approach for glacier monitoring.

scholarly journals Readings of the Post-Crisis Spanish City: Between Social Inequity and Territorial Destruction

Urban Science ◽  
2019 ◽  
Vol 3 (2) ◽  
pp. 43
Author(s):  
Francisco Cebrián-Abellán ◽  
María José Piñeira-Mantiñán ◽  
Jesús M. González-Pérez
Keyword(s):  
Case Studies ◽  
Turning Point ◽  
Regional Level ◽  
Model Based ◽  
The Social ◽  
Urban Level ◽  
City Model ◽  
The Impact ◽  
The City ◽  
City Models

The 2008 crisis entailed a turning point in the process of creating and managing cities and territories. There has been a change from a city model, based on expansive growth, which was also speculative and deregulated, had provoked an unprecedented expansion of the outskirts of towns and cities, and the artificialization of thousands of hectares of land, to a model based on the reconstruction of the original city, before the impact of the crisis. Gone are the days of urban mega-projects—source of indebtedness for local administrations- and big urbanizations, which, in many occasions, have not been inhabited. The financial, social, and residential reality requires a better thinking of the city models, as well as recuperating the neighborhoods and recomposing the social gap and conflicts, which had become affected by unemployment, evictions, and austerity policies. In this paper, two models of understanding and managing cities have been presented, as a way of identifying strengths, weaknesses, and impacts on the modern city. Several case studies have been collected at a regional level (Extremadura and Valencian Community), and at an urban level (Las Palmas, Madrid, Barcelona, Valencia, and Toledo), and even at a sub-urban level (via the study of certain neighborhoods).

Schooling in the city: educational history and the urban variable

Urban History ◽  
1992 ◽  
Vol 19 (1) ◽  
pp. 23-38
Author(s):  
David A. Reeder
Keyword(s):  
Cultural History ◽  
Case Studies ◽  
Urban History ◽  
Urban Culture ◽  
Educational History ◽  
Modern Period ◽  
History Of ◽  
British Perspective ◽  
The Impact ◽  
The City

Educational history has been regularly noticed in the Urban History Yearbook in reviews, and in the bibliography under the heading of urban culture, but it has been a minority interest among urban historians and in Britain the treatment of schools and schooling in town histories has tended until recently to be perfunctory or conventional. However, the impact of social and cultural history on both urban and educational history is resulting in more of an overlap of interests. Hence the publication later this year, in the series of themes in International Urban History, of a set of comparative essays on urban educational history: The City and Education in Four Nations. This article anticipates the historiographical reviews, case studies and theoretical discussions of that volume. It attempts to show, from a British perspective, how recent historiographical bends raise questions and issues of interest to urban historians of the modern period.

scholarly journals Solo Batik Carnival Menjadi Daya Tarik Kota Surakarta dalam Bidang Budaya

2020 ◽  
Author(s):  
Cindy Alisa Reninda Wistantri
Keyword(s):  
Data Collection ◽  
Case Studies ◽  
Descriptive Analysis ◽  
City Government ◽  
Cultural Event ◽  
The People ◽  
The Future ◽  
Qualitative Descriptive ◽  
The Impact ◽  
The City

Batik is one of the special attractions for the City of Surakarta, therefore the City Government of Surakarta uses it to be processed,packaged,innovated into a cultural event that is Solo Batik Carnival with a variety of unique themes that vary each year. The purpose of this research is to increase the potential of Surakarta City specifically in the field of culture through the Solo Batik Carnival. The method used in this research is a qualitative descriptive with the approach of data collection,observation,case studies. The result obtained are based on descriptive analysis that through the Solo Batik Carnival event can attract the attention of the people of Surakarta and outside the City of Surakarta and introduce the collection of batik in the City of Surakarta. So that people are able to appreciate it. The impact of the Solo Batik Carnival for the City of Surakarta is the potential the City of Surakarta to increase,progress and be known by the people of Surakarta and outside the City of Surakarta. In addition, the development of the Surakarta City batik model can be held in the future to become more creative and innovative.

scholarly journals Solo Batik Carnival Menjadi Daya Tarik Kota Surakarta dalam Bidang Budaya

2020 ◽  
Author(s):  
Cindy Alisa Reninda Wistantri
Keyword(s):  
Data Collection ◽  
Case Studies ◽  
Descriptive Analysis ◽  
City Government ◽  
Cultural Event ◽  
The People ◽  
The Future ◽  
Qualitative Descriptive ◽  
The Impact ◽  
The City

Batik is one of the special attractions for the City of Surakarta, therefore the City Government of Surakarta uses it to be processed,packaged,innovated into a cultural event that is Solo Batik Carnival with a variety of unique themes that vary each year. The purpose of this research is to increase the potential of Surakarta City specifically in the field of culture through the Solo Batik Carnival. The method used in this research is a qualitative descriptive with the approach of data collection,observation,case studies. The result obtained are based on descriptive analysis that through the Solo Batik Carnival event can attract the attention of the people of Surakarta and outside the City of Surakarta and introduce the collection of batik in the City of Surakarta. So that people are able to appreciate it. The impact of the Solo Batik Carnival for the City of Surakarta is the potential the City of Surakarta to increase,progress and be known by the people of Surakarta and outside the City of Surakarta. In addition, the development of the Surakarta City batik model can be held in the future to become more creative and innovative.

The impact of a mega-event on city branding: The European Capital of Culture 2010 and the image of Istanbul

2013 ◽  
Vol 3 (1) ◽  
pp. 29-50 ◽  
Author(s):  
Evinç Doğan ◽  
Ibrahim Sirkeci
Keyword(s):  
Visual Analysis ◽  
Place Branding ◽  
World City ◽  
City Branding ◽  
City Image ◽  
European Capital Of Culture ◽  
National Boundaries ◽  
Symbolic Production ◽  
The Impact ◽  
The City

This study examines the ways in which the city image of Istanbul is re-created through the mega-events within the context of the European Capital of Culture (ECoC) 2010. Istanbul “took the stage” as one of the three ECoC cities (Essen for the Ruhr in Germany and Pécs in Hungary), where the urban spaces were projected as the theatre décor while residents and visitors became the spectators of the events. Organisers and agents of the ECoC 2010 seemed to rebrand Istanbul as a “world city” rather than a “European capital”. With a series of transnational connotations, this can be considered as part of an attempt to turn Istanbul to a global city. In this study we examine posters used during the ECoC 2010 to see whether this was evident in the promoted images of Istanbul. The research employs a hermeneutic approach in which representations, signs and language are the means of symbolic meaning, which is analysed through qualitative methods for the visual data (Visual Analysis Methods), namely Semiotics and Discourse Analysis. The analysed research material comes from a sample of posters released during the ECoC 2010 to promote 549 events throughout the year. Using stratified random sampling we have drawn 28 posters (5% of the total) reflecting the thematic groups of events in the ECoC 2010. Particular attention is also paid to the reflexivity of the researchers and researchers’ embeddedness to the object of research. The symbolic production and visual representation are therefore investigated firstly through the authoritative and historically constituted discourses in the making of Istanbul image and secondly through the orders of cultural consumption and mediatisation of culture through spectacular events. Hence enforcing a transnationalisation of the image of the city where the image appears to be almost stateless transcending the national boundaries. Findings and methodology used in this study can be useful in understanding similar cases and further research into the processes of city and place branding and image relationships. 

Urbanization of fauna on the example of marsh frog (Pelophylax ridibundus)

2015 ◽  
Vol 26 (3-4) ◽  
pp. 116-123
Author(s):  
A. P. Korzh ◽  
T. V. Zahovalko
Keyword(s):  
Urban Areas ◽  
Cognitive Modeling ◽  
Negative Impact ◽  
Natural Populations ◽  
Cellular Level ◽  
Anthropogenic Factors ◽  
Migration Routes ◽  
Corrective Effect ◽  
The Impact ◽  
The City

Recently, the number of published works devoted to the processes of synanthropization of fauna, is growing like an avalanche, which indicates the extreme urgency of this theme. In our view, the process of forming devices to coexist with human and the results of his life reflects the general tandency of the modern nature evolution. Urbanization is characteristic for such a specific group of animals like amphibians, the evidence of which are numerous literature data. Many researchers use this group to assess the bioindicative quality of the environment. For this aim a variety of indicators are used: from the cellular level of life of organization up to the species composition of the group in different territories. At the same time, the interpretation of the results is not always comparable for different areas and often have significantly different interpretations by experts. Urban environment, primarily due to the contamination is extremely aggressive to amphibians. As a consequence, the urban populations of amphibians may be a change in the demographic structure, affecting the reproductive ability of the population, the disappearance of the most sensitive species or individuals, resizing animals, the appearance of abnormalities in the development, etc. At the same time play an important amphibians in the ecosystems of cities, and some species in these conditions even feel relatively comfortable. Therefore, it is interesting to understand the mechanisms of self-sustaining populations of amphibians in urban environments. To assess the impact of natural and anthropogenic factors on the development of amphibian populations were used cognitive modeling using the program Vensim PLE. Cognitive map of the model for urban and suburban habitat conditions were the same. The differences concerned the strength of connections between individual factors (migration, fertility, pollution) and their orientation. In general, factors like pollution, parasites, predators had negative impact on the population, reducing its number. The birth rate, food and migration contributed to raising number of individuals. Some of the factors affected on the strength to of each other as well: the majority of the factors affected the structure of the population, had an influence on the fertility. Thanks to it the model reflects the additive effect of complex of factors on the subsequent status of the population. Proposed and analyzed four scenarios differing strength and duration of exposure. In the first scenario, a one-time contamination occurs and not subsequently repeated. The second and third scenario assumes half board contamination, 1 year (2 scenario) and two years (scenario 3). In the fourth scenario, the pollution affected the population of amphibians constantly. In accordance with the results of simulation, much weaker than the natural populations respond to pollution - have them as an intensive population growth and its disappearance at constant pollution is slow. Changes to other parameters of the model showed that this pollution is the decisive factor -only the constant action leads to a lethal outcome for the populations. All other components of the model have a corrective effect on the population dynamics, without changing its underlying trand. In urban areas due to the heavy impact of pollution maintaining the population is only possible thanks to the migration process – the constant replenishment of diminishing micropopulations of natural reserves. This confirms the assumption that the form of existence metapopulations lake frog in the city. In order to maintain the number of amphibians in urban areas at a high level it is necessary to maintain existing migration routes and the creation of new ones. Insular nature of the placement of suitable habitats in urban areas causes the metapopulation structure of the types of urbanists. Therefore, the process of urbanization is much easier for those species whicht are capable of migration in conditions of city. In the initial stages of settling the city micropopulationis formed by selective mortality of the most susceptible individuals to adverse effects. In future, maintaining the categories of individuals is provided mainly due to migration processes metapopulisation form of the species of existence is supported). It should be noted that the changes in the previous levels are always saved in future. In the case of reorganizations of individuals we of morphology can assume the existence of extremely adverse environmental conditions that threaten the extinction of the micropopulations. 

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