Integration Of Heterogeneous Data Sources Research Articles

Multimodal Deep Learning for Estimating Lane-Level Urban Traffic by Fusing Closed-Circuit Television and Dedicated Short-Range Communication Data

Seamless, accurate, and reliable traffic information is critical for planning and operational strategies in traffic management. Urban networks are increasingly being equipped with various types of detectors to collect continuous traffic data. However, the widespread installation and management of these detectors at all intersections and road sections are limited by cost constraints and various problems. Moreover, the direct integration and utilization of heterogeneous data sources are challenging because of their distinct and interconnected characteristics. This study introduces a multimodal deep learning model, combining closed-circuit television (CCTV) and dedicated short-range communication (DSRC) data, to estimate lane-level urban traffic volumes. The proposed model employs a multilayer perceptron to extract features from each modality. These features are then fused and used as input into a recurrent neural network model that estimates the lane-level traffic volume. We present the multimodal deep learning model in three forms: (1) fusion of traffic volume, occupancy, and queue length from CCTV data; (2) fusion of traffic volume from CCTV data with travel time from DSRC data; and (3) fusion of different attributes from CCTV and heterogeneous DSRC data. In addition, we develop a single-modality model that solely utilizes CCTV data on traffic volume to compare the performance with the proposed multimodal model and identify scenarios where the multimodal approach is essential. The proposed model demonstrates significant improvements over the single-modality model, providing enhanced accuracy for higher temporal resolutions and lanes that permit left or right turns.

An Aggregated Shape Similarity Index: A Case Study of Comparing the Footprints of OpenStreetMap and INSPIRE Buildings

The mutual identification of spatial objects is a fundamental issue when updating geographic data with other data sets. Representations of spatial objects in different sources may not have the same identifiers, which would unambiguously assign them to each other. Intersections of spatial objects can be used for this purpose, but this does not allow for the detection of possible changes and their quantification. The aim of this paper is to propose a simple, applicable procedure for calculating the shape similarity measure, which should be able to efficiently identify different representations of spatial objects in two data sources, even though they may be changed or generalised. The main result is the aggregated index of shape similarity and instructions for its calculation and implementation. The shape similarity index is based on the calculation of the set similarity, the distance of the boundaries, and the differences in the area, perimeter, and number of the vertices of areal spatial objects. In the case study, the footprints of the building complexes in Dúbravka (part of the city of Bratislava, the capital of Slovakia) are compared using data from OpenStreetMap and INSPIRE (Infrastructure for Spatial Information in Europe) Buildings. A contribution to the quality check of the OpenStreetMap data is then a secondary result. The proposed method can be effectively used in the semi-automatic integration of heterogeneous data sources, updating the data source with other spatial data, or in their quality control.

Using Data Fabric Architecture to Create Personalized Visual Analytics Systems in the Field of Digital Medicine

The paper describes an innovative approach of applying data factory technologies, which have found their successful practical application to create new generations of corporate data warehouses, are proposed to be used to develop personalized visual analytics environments. The approach provides access to digital data of a particular person from both heterogeneous distributed external and local sources not on the principles of their consolidation, but on the principles of virtual integration. The application of the described approach is demonstrated by the example of the development of visual analytics tools in the field of digital medicine. The emphasis is on the technological aspects of applying the concept of data factories for the development of personalized visual analytics services, means of semantic integration of heterogeneous data sources and their adaptation not only to heterogeneous structured and unstructured data sources, but also to the semantic content of various subject areas.

Linguistic and ontological challenges of multiple domains contributing to transformed health ecosystems.

This paper provides an overview of current linguistic and ontological challenges which have to be met in order to provide full support to the transformation of health ecosystems in order to meet precision medicine (5 PM) standards. It highlights both standardization and interoperability aspects regarding formal, controlled representations of clinical and research data, requirements for smart support to produce and encode content in a way that humans and machines can understand and process it. Starting from the current text-centered communication practices in healthcare and biomedical research, it addresses the state of the art in information extraction using natural language processing (NLP). An important aspect of the language-centered perspective of managing health data is the integration of heterogeneous data sources, employing different natural languages and different terminologies. This is where biomedical ontologies, in the sense of formal, interchangeable representations of types of domain entities come into play. The paper discusses the state of the art of biomedical ontologies, addresses their importance for standardization and interoperability and sheds light to current misconceptions and shortcomings. Finally, the paper points out next steps and possible synergies of both the field of NLP and the area of Applied Ontology and Semantic Web to foster data interoperability for 5 PM.

An open-source platform integrating emerging data sources to support multi-modal active pharmacovigilance

As new data sources have emerged, the data space which Pharmacovigilance (PV) processes can use has significantly expanded. However, still, the currently available tools do not widely exploit data sources beyond Spontaneous Report Systems built to collect Individual Case Safety Reports (ICSRs). This article presents an open-source platform enabling the integration of heterogeneous data sources to support the analysis of drug safety related information. Furthermore, the results of a comparative study as part of the project’s pilot phase are also presented. Data sources were integrated in the form of four “workspaces”: (a) Individual Case Safety Reports—obtained from OpenFDA, (b) Real-World Data (RWD) —using the OMOP-CDM data model, (c) social media data—collected via Twitter, and (d) scientific literature—retrieved from PubMed. Data intensive analytics are built for each workspace (e.g., disproportionality analysis metrics are used for OpenFDA data, descriptive statistics for OMOP-CDM data and twitter data streams etc.). Upon these workspaces, the end-user sets up “investigation scenarios” defined by Drug-Event Combinations (DEC). Specialized features like detailed reporting which could be used to support reports for regulatory purposes and also “quick views” are provided to facilitate use where detailed statistics might not be needed and a qualitative overview of the available information might be enough (e.g., clinical environment). The platform’s technical features are presented as Supplementary Material via a walkthrough of an example “investigation scenario”. The presented platform is evaluated via a comparative study against the EVDAS system, conducted by PV professionals. Results from the comparative study, show that there is indeed a need for relevant technical tools and the ability to draw recent data from heterogeneous data sources is appreciated. However, a reluctance by end-users is also outlined as they feel technical improvements and systematic training are required before the potential adoption of the presented software. As a whole, it is concluded that integrating such a platform in real-world setting is far from trivial, requiring significant effort on training and usability aspects.

Knowledge Graph based Representation to Extract Value from Open Government Data

Open government data refers to data that is made available by government entities to be freely reused by anyone and for any purpose. The potential benefits of open government data are numerous and include increasing transparency and accountability, enhancing citizens' quality of life, and boosting innovation. However, realizing these benefits is not always straightforward, as the usage of this raw data often faces challenges related to its format, structure, and heterogeneity which hinder its processability and integration. In response to these challenges, we propose an approach to maximize the usage of open government data and achieve its potential benefits. This approach leverages knowledge graphs to extract value from open government data and drive the construction of a knowledge graph from structured, semi-structured, and non-structured formats. It involves the extraction, transformation, semantic enrichment, and integration of heterogeneous open government data sources into an integrated and semantically enhanced knowledge graph. Learning mechanisms and ontologies are used to efficiently construct the knowledge graph. We evaluate the effectiveness of the approach using real-world public procurement data and show that it can detect potential fraud such as favoritism.

Feasibility of UTS Smart Home to Support Sustainable Development Goals of United Nations (UN SDGs): Water and Energy Conservation

The Sustainable Development Goals of the United Nations strive to maximize development needs, while minimizing environmental deterioration, without jeopardizing the needs of future generations. Nevertheless, due to urbanization, the escalating trend in natural-resource use, particularly electricity and water, is currently a crucial challenge for sustainable development. One of the promising options is the smart home, which is an extension of building automation with smart characteristics in monitoring, analyzing, controlling, and cloud computing with networked smart devices. Due to the lack of appropriate infrastructure and conscious consumption, its global adoption in the construction industry remains low. We present a technical feasibility of a multi-functional experimental smart home to support the Sustainable Development Goals of the United Nations in terms of water and energy conservation. The layered architecture of the cloud platform with an application program interface enables seamless integration of heterogeneous smart-home technologies and data sources. Use cases demonstrated its capacity to conserve electrical energy and water resources in support of the United Nations’ Sustainable Development Goals. Aside from that, the smart home’s electricity self-consumption of at least three autonomy days was confirmed with zero emissions and electricity bills, and a reduced supply-water consumption.

Integroly: Automatic Knowledge Graph Population from Social Big Data in the Political Marketing Domain

Social media sites have become platforms for conversation and channels to share experiences and opinions, promoting public discourse. In particular, their use has increased in political topics, such as citizen participation, proselytism, or political discussions. Political marketing involves collecting, monitoring, processing, and analyzing large amounts of voters’ data. However, the extraction, integration, processing, and storage of these torrents of relevant data in the political domain is a very challenging endeavor. In the recent years, the semantic technologies as ontologies and knowledge graphs (KGs) have proven effective in supporting knowledge extraction and management, providing solutions in heterogeneous data sources integration and the complexity of finding meaningful relationships. This work focuses on providing an automated solution for the population of a political marketing-related KG from Spanish texts through Natural Language Processing (NLP) techniques. The aim of the proposed framework is to gather significant data from semi-structured and unstructured digital media sources to feed a KG previously defined sustained by an ontological model in the political marketing domain. Twitter and political news sites were used to test the usefulness of the automatic KG population approach. The resulting KG was evaluated through 18 quality requirements, which ensure the optimal integration of political knowledge.

Applying Hybrid Lstm-Gru Model Based on Heterogeneous Data Sources for Traffic Speed Prediction in Urban Areas.

With the advent of the Internet of Things (IoT), it has become possible to have a variety of data sets generated through numerous types of sensors deployed across large urban areas, thus empowering the notion of smart cities. In smart cities, various types of sensors may fall into different administrative domains and may be accessible through exposed Application Program Interfaces (APIs). In such setups, for traffic prediction in Intelligent Transport Systems (ITS), one of the major prerequisites is the integration of heterogeneous data sources within a preprocessing data pipeline resulting into hybrid feature space. In this paper, we first present a comprehensive algorithm to integrate heterogeneous data obtained from sensors, services, and exogenous data sources into a hybrid spatial–temporal feature space. Following a rigorous exploratory data analysis, we apply a variety of deep learning algorithms specialized for time series geospatial data and perform a comparative analysis of Long Short-Term Memory (LSTM), Gated Recurrent Unit (GRU), Convolutional Neural Network (CNN), and their hybrid combinations. The hybrid LSTM–GRU model outperforms the rest with Root Mean Squared Error (RMSE) of 4.5 and Mean Absolute Percentage Error (MAPE) of 6.67%.

SiSEG-Auto Semantic Annotation Service to Integrate Smart Energy Data

In a modern smart energy system, the amount of available data from various sources is growing significantly. Other sectors such as medical or social sectors exhibit the same phenomenon. Due to the amount, complexity and heterogeneity of data, a complex algorithm is required for the integration and analysis of heterogeneous data sources. The Web of Things and semantic-based approaches address the fragmentation of standards, platforms, services and technologies in smart energy and non-energy sectors, and enable heterogeneous data integration and interoperability. This paper presents SiSEG, a semantic annotation service that is developed to automate the process of annotating data and address the problem of heterogeneous data integration in a reusable and extensible way by using the fuzzy method. Moreover, the accuracy of SiGEG has been evaluated.

Semantic Integration of Heterogeneous Data Sources Using Ontology-Based Domain Knowledge Modeling for Early Detection of COVID-19.

The enormous outbreak of biomedical knowledge, the aim of reducing computation and processing costs and the widespread availability of internet connection have created a profuse amount of electronic data. Such data are stored across the globe in various data sources that are semantically, structurally and syntactically different. This decentralized nature of biomedical data has made it difficult to obtain a unified view of the data. Data integration plays a crucial role in enhancing access to heterogeneous data making the retrieval easier and faster. A variety of ontology, machine learning, deep learning and fuzzy logic-based solutions are being developed for heterogeneous data integration. The proposed model concentrates on the automatic ontology-based data integration method that can be effectively deployed and used in the healthcare domain. The proposed model is divided into three phases. The first phase includes the automatic mapping of data and generation of local ontology across heterogeneous data sources, the second phase combines the local ontology models developed in the first phase to create a root global schema mapping and the third phase queries diverse databases to retrieve semantically analogous records. The model is created based on the medical records, chest X-ray details and COVID-19 symptom questionnaire data of various patients distributed across three data sources (SQL, mongodb and excel). Based on the data, the patients who have moderate/higher risk of developing serious illness from COVID-19 are retrieved.

Challenges in Curating Interdisciplinary Data in the Biodiversity Research Community

Panelists: James Macklin, Agriculture and Agri-Food Canada; Anne Thessen, University of Colorado Anschutz Medical Campus; Robbie Burger, University of Kentucky; Ben Norton, North Carolina Museum of Natural Sciences Organizers: Kimberly Cook, University of Kentucky; Inna Kouper, Indiana University As research incentives become increasingly focused on collaborative work, addressing the challenges of curating interdisciplinary data becomes a priority. A panel convened at the TDWG 2021 virtual conference on October 19 discussed these issues and provided the space where people with a variety of experience curating interdisciplinary biodiversity data shared their knowledge and expertise. The panel started with a brief introduction to the challenges of interdisciplinary and highly collaborative research (IHCR), which the panel organizers have previously observed (Kouper et al. 2021). In addition to varying definitions that focus on crossing the disciplinary boundaries or synthesizing knowledge, IHCR is characterized by an increasing emphasis on computation, integration of heterogeneous data sources, and work with multiple stakeholders. As such, IHCR data does not fit with traditional lifecycle models as it requires more iterations, coordination, and shared language. Narrowing the scope to biodiversity data, the panelists acknowledged that biodiversity is a truly interdisciplinary domain where researchers and practitioners bring their diverse expertise to take care of data. The domain has a variety of contributors, including data producers, users, and curators. While they share common goals, these contributors are often fragmented in separate projects that prioritize academic disciplines or public engagement. Lack of knowledge and awareness about contributors and their projects and expertise as well as a certain vulnerability in branching out into new areas, are among the factors that make it difficult to tear down silos. As James Macklin put it, “... you're crossing a boundary into a place you don't maybe know a lot about, and for some people, that's hard to do. Right? It takes a lot of listening and thinking.” Due to their complex and interactive nature, IHCR projects almost always have a higher overhead in terms of communication, coordination, and management. Panelists agreed that for such projects there needs to be a collaboration handbook that assigns roles and responsibilities and establishes rules for various aspects of collaboration, including authorship and handling disagreements. Successful IHCR projects create such handbooks at the beginning and revisit them regularly. Another useful strategy mentioned was to hold debriefing sessions that evaluate what went well and what didn’t. Strong leadership that takes IHCR complexities into account and builds a network of capable facilitators and “bridge-builders” or “translators” is a big factor that makes projects succeed. Recognizing and encouraging the role of facilitators from the onset of the project helps to develop productive relationships across disciplines and areas of expertise. It also enables everyone to focus on their strengths and build trust. Data and metadata integration is one of the big challenges in biodiversity, although it is not unique to it. Biodiversity brings together many disciplines and each of them identifies its own problems and collects data to address them. Data silos stem from disciplinary silos, and it will take a different, more integrated, kind of cyberinfrastructure and modeling to bring these pieces together. Creating such infrastructures and standards around interdisciplinary data and metadata are serious needs, although they are not valued and rewarded enough compared to, say publishing academic papers. Lack of standardization and infrastructure also stands in the way of improving the quality of data in biodiversity. To evaluate the quality of data and to trust its creators, data users need to know who gathered and processed the data and how. When the data is re-used within a collaborative project, there is an opportunity to ask questions and find out why, for example, someone had certain naming conventions or processing and analytical approaches. Long-term data such as species’ life history traits, however, can be collected over long periods of time. Improving the quality of biodiversity data requires going beyond interpersonal communication and addressing the issues of metadata and standards more systematically. Panelists also discussed the issue of openness in connection to biodiversity data. Openness contributes to the improved quality of data and an increased return on public investment in science and research. Panelists’ positions diverged in the degree to which biodiversity data should be open and approaches to address competitiveness and sensitivity in research. On one hand, they acknowledged the need for some form of embargo on data sharing to allow data originators to benefit from their effort; on the other, they argued that lack of openness promotes silos and diminishes the quality of research and its reproducibility. Panelists briefly discussed the COVID pandemic data as an example of how lack of openness and silos can be detrimental to finding solutions: “COVID has given us the best example we have of how silos do damage to things that could have gone better. ... the data wasn't available, if it had been open or not even necessarily open but had anybody had any idea that it existed somewhere, that would have helped a lot. … We are learning those lessons, governments are changing the way they do business because of it. And so for us, I mean, our community, I think this has been one of the best things that could have happened to us in some ways, simply because it forced a change of mindset. And it has forced citizens to get engaged.” [James Macklin] The panelists, who brought a wide range of expertise to the discussion, including semantic and digitization technologies, agricultural data, evolutionary biology, and mineralogy among others, discussed projects they work on, which engaged the audience and stimulated a discussion among all participants about the role of end users in biodiversity data curation, non-traditional careers in biodiversity, and approaches to reviewing data similar to traditional research publications. Panelists and the audience also discussed the differences between “cleaning” and “annotating” data, making annotations part of the biodiversity record and data reviews. These productive discussions provide a foundation for further developments in the research and practice of curating biodiversity data and building strong interdisciplinary communities.

ADDRESSING THE ELEPHANT IN THE UNDERGROUND: AN ARGUMENT FOR THE INTEGRATION OF HETEROGENEOUS DATA SOURCES FOR RECONCILIATION OF SUBSURFACE UTILITY DATA

Abstract. In this paper we address the issue of unreliable subsurface utility information. Data on subsurface utilities are often positionally inaccurate, not up to date, and incomplete, leading to increased uncertainty, costs, and delays incurred in underground-related projects. Despite opportunities for improvement, the quality of legacy data remains unaddressed. We address the legacy data issue by making an argument for an approach towards subsurface utility data reconciliation that relies on the integration of heterogeneous data sources. These data sources can be collected at opportunities that occur throughout the life cycle of subsurface utilities and include as-built GIS records, GPR scans, and open excavation 3D scans. By integrating legacy data with newly captured data sources, it is possible to verify, (re)classify and update the data and improve it for future use. To demonstrate the potential of an integration-driven data reconciliation approach, we present real-world use cases from Denmark and Singapore. From these cases, challenges towards implementation of the approach were identified that include a lack of technological readiness, a lack of incentive to capture and share the data, increased cost, and data sharing concerns. Future research should investigate in detail how various data sources lead to improved data quality, develop a data model that brings together all necessary data sources for integration, and a framework for governance and master data management to ensure roles and responsibilities can be feasibly enacted.

Applications of Semantic Web in integrating open data and bibliographic records: a development example of an infomediary of Taiwanese indigenous people

Purpose This study aims to develop a Web-based application system called Infomediary of Taiwanese Indigenous Peoples (ITIP) that can help individuals comprehend the society and culture of indigenous people. The ITIP is based on the use of Semantic Web technologies to integrate a number of data sources, particularly including the bibliographic records of a museum. Moreover, an ontology model was developed to help users search cultural collections by topic concepts. Design/methodology/approach Two issues were identified that needed to be addressed: the integration of heterogeneous data sources and semantic-based information retrieval. Two corresponding methods were proposed: SPARQL federated queries were designed for data integration across the Web and ontology-driven queries were designed to semantically search by knowledge inference. Furthermore, to help users perform searches easily, three searching interfaces, namely, ethnicity, region and topic, were developed to take full advantage of the content available on the Web. Findings Most open government data provides structured but non-resource description framework data, Semantic Web consumers, therefore, require additional data conversion before the data can be used. On the other hand, although the library, archive and museum (LAM) community has produced some emerging linked data, very few data sets are released to the general public as open data. The Semantic Web’s vision of “web of data” remains challenging. Originality/value This study developed data integration from various institutions, including those of the LAM community. The development was conducted based on the mode of non-institution members (i.e. institutional outsiders). The challenges encountered included uncertain data quality and the absence of institutional participation.

IoT-based Dairy Supply Chain - An Ontological Approach

Emerging digital transformation in industry is noticeable among others in Supply Chain Management (SCM). For instance, applying new-generation digitalized technologies in the Dairy Supply Chain (DSC) enables an increase of manufacturing productivity, improves planning and forecasting, and also enhances competitive capabilities according to Industry 4.0 assumptions. It is worth mentioning, that in modern DSC, high visibility of raw materials, components, products, and processes by all contributors on all stages of DSC is crucial. This article focuses on the transparency aspect of the DSC supported by IoT-based technologies enabling interoperability among all DSC participants. The paper addresses the problem of effective integration of heterogeneous data sources, i.e., deployed new technological IoT solutions with traditional SCM systems and a third-party software component. The main objective of this report is to propose the IoT-based DSC model comprising four chain stages: milk production, milk transportation, milk processing, and dairy products distribution. Moreover, the comprehensive DSC domain ontology as a knowledge model is formulated and described. The ontology aims on improvement of the DSC management efficiency by facilitating interoperability within DSC. The applicability of the proposed ontological model is verified using a sustainable-oriented case study, which estimates the environmental footprint at the milk transportation stage of the DSC.

Design and implementation of a holistic framework for data integration in industrial machine and sensor networks

Digitalization and connectivity trends in industrial plants and production equipment create vast and heterogeneous networks of data sources, data sinks and various communication protocols. Data fusion and evaluation of these resources result in high costs for data integration and maintenance. Therefore, we propose a new framework, called MyGateway, enabling effortless integration of heterogeneous data sources, their fusion within the framework and publication to data sinks as needed. For easy integration, deployment, and expansion of the framework we provide an implementation in JAVA using open-source adapters for common industrial protocols and a simple API for usage in user specified setups.

Semantic integration of traditional and heterogeneous data sources (UML, XML and RDB) in OWL2 triplestore

Semantic integration of traditional and heterogeneous data sources (UML, XML and RDB) in OWL2 triplestore

Drug repurposing improvement using a novel data integration framework based on the drug side effect

The most significant drawback of experimental methods in drug development and discovery is that they are time-consuming and costly. Researches have indicated that designing a new drug from primary stages to its delivery to the consumer market lasts between 10 and 15 years. Moreover, this process costs about 0.8–1.5 billion dollars. Drug repurposing refers to seeking new indications for approved drugs. Recently, some methods have attempted to repurpose drugs based on incorporating computational approaches. In the present research, a method has been proposed for drug repurposing with the aim of integrating diverse and heterogeneous data sources, called DRSE. The proposed method can predict drug-disease associations based on the integration of multiple data sources through a matrix factorization algorithm considering side effect features of the drugs. The experimental results confirmed that the proposed method can improve accuracy of the drug repurposing task. In addition, the AUC and AUPR criteria have been improved by 1.13 and 14.23%, respectively, compared to the state-of-the-art methods. • A framework for drug repurposing by integration of diverse and heterogeneous data sources is proposed. • It predicts drug-disease associations by a matrix factorization algorithm based on side-effect features of drugs. • It uses a Random Walk with Restart (RWR) and feature compacting technique.

Semantic integration of traditional and heterogeneous data sources (UML, XML and RDB) in OWL2 triplestore

With the success of the internet and the expansion of the amount of data in the web, the exchange of information from various heterogeneous and classical data sources becomes a critical need. In this context, researchers must propose integration solutions that allow applications to simultaneously access several data sources. In this perspective, we propose a semi-automatic integration approach of classical data sources via a global schema located in database management systems of RDF or OWL data, called triplestore. Our contribution is subdivided into three axes: 1) an automatic mapping solution that converts classical data sources such as UML, XML and RDB to local ontologies based on OWL2 language; 2) an alignment system of local ontologies based on syntactic, semantic and structural similarity measurement techniques in order to increase the probability of having real correspondences and real differences; 3) a fusion system of pre-existing local ontologies into a global ontology based on the alignment found in the previous step.

A Machine Learning Approach for Rainfall Estimation Integrating Heterogeneous Data Sources

Providing an accurate rainfall estimate at individual points is a challenging problem in order to mitigate risks derived from severe rainfall events, such as floods and landslides. Dense networks of sensors, named rain gauges (RGs), are typically used to obtain direct measurements of precipitation intensity in these points. These measurements are usually interpolated by using spatial interpolation methods for estimating the precipitation field over the entire area of interest. However, these methods are computationally expensive, and to improve the estimation of the variable of interest in unknown points, it is necessary to integrate further information. To overcome these issues, this work proposes a machine learning-based methodology that exploits a classifier based on ensemble methods for rainfall estimation and is able to integrate information from different remote sensing measurements. The proposed approach supplies an accurate estimate of the rainfall where RGs are not available, permits the integration of heterogeneous data sources exploiting both the high quantitative precision of RGs and the spatial pattern recognition ensured by radars and satellites, and is computationally less expensive than the interpolation methods. Experimental results, conducted on real data concerning an Italian region, Calabria, show a significant improvement in comparison with Kriging with external drift (KED), a well-recognized method in the field of rainfall estimation, both in terms of the probability of detection (0.58 versus 0.48) and mean-square error (0.11 versus 0.15).