New Model for Geospatial Coverages in JSON

2019 ◽  
pp. 316-357
Author(s):  
Joan Maso ◽  
Alaitz Zabala Torres ◽  
Peter Baumann
Keyword(s):  
Geospatial Information ◽  
New Model ◽  
Web Map ◽  
On Demand ◽  
Image File

Map browsers currently in place present maps and geospatial information using common image formats such as JPEG or PNG, usually created from a service on demand. This is a clear approach for a simple visualization map browser but prevents the browser from modifying the visualization since the content of the image file represents the intensity of colors of each pixel. In a desktop GIS, a coverage dataset is an array of values quantifying a certain property in each pixel of a subdomain of the space. The standard used to describe and distribute coverages is called web coverage service (WCS). Traditionally, encoding of coverages was too complex for map browsers implemented in JavaScript, relegating the WCS to a data download, a process that creates a file that will be later used in a desktop GIS. The combination of a coverage implementation schema in JSON, binary arrays, and HTML5 canvas makes it possible that web map browsers can be directly implemented in JavaScript.

scholarly journals ERAS OF WEB MAPPING DEVELOPMENTS: PAST, PRESENT AND FUTURE

2016 ◽  
Vol XLI-B4 ◽  
pp. 247-252 ◽  
Author(s):  
Bert Veenendaal
Keyword(s):  
Information Systems ◽  
Geographic Information Systems ◽  
Small Group ◽  
Geographic Information ◽  
Multiple Sources ◽  
Geospatial Information ◽  
Web Based ◽  
Web Mapping ◽  
Web Map ◽  
The Past

Developments in web mapping and web based geographic information systems (GIS) have evolved rapidly over the past two decades. What began as online map images available to a small group of geospatial experts and professionals has developed to a comprehensive and interactive web map based on integrated information from multiple sources and manipulated by masses of users globally. This paper introduces a framework that outlines the eras of web mapping and significant developments among those eras. From this framework, some of the influences and trends can be determined, particularly those in relation to the development of technologies and their relation to the growth in the number and diversity of users and applications that utilise web mapping and geospatial information online.

scholarly journals ERAS OF WEB MAPPING DEVELOPMENTS: PAST, PRESENT AND FUTURE

2016 ◽  
Vol XLI-B4 ◽  
pp. 247-252
Author(s):  
Bert Veenendaal
Keyword(s):  
Information Systems ◽  
Geographic Information Systems ◽  
Small Group ◽  
Geographic Information ◽  
Multiple Sources ◽  
Geospatial Information ◽  
Web Based ◽  
Web Mapping ◽  
Web Map ◽  
The Past

Developments in web mapping and web based geographic information systems (GIS) have evolved rapidly over the past two decades. What began as online map images available to a small group of geospatial experts and professionals has developed to a comprehensive and interactive web map based on integrated information from multiple sources and manipulated by masses of users globally. This paper introduces a framework that outlines the eras of web mapping and significant developments among those eras. From this framework, some of the influences and trends can be determined, particularly those in relation to the development of technologies and their relation to the growth in the number and diversity of users and applications that utilise web mapping and geospatial information online.

scholarly journals Preference-Aware Task Assignment in On-Demand Taxi Dispatching: An Online Stable Matching Approach

2019 ◽  
Vol 33 ◽  
pp. 2245-2252 ◽  
Author(s):  
Boming Zhao ◽  
Pan Xu ◽  
Yexuan Shi ◽  
Yongxin Tong ◽  
Zimu Zhou ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
User Experience ◽  
Real World ◽  
Online Algorithm ◽  
Task Assignment ◽  
Stable Matching ◽  
Central Issue ◽  
New Model ◽  
On Demand ◽  
Long Run

A central issue in on-demand taxi dispatching platforms is task assignment, which designs matching policies among dynamically arrived drivers (workers) and passengers (tasks). Previous matching policies maximize the profit of the platform without considering the preferences of workers and tasks (e.g., workers may prefer high-rewarding tasks while tasks may prefer nearby workers). Such ignorance of preferences impairs user experience and will decrease the profit of the platform in the long run. To address this problem, we propose preference-aware task assignment using online stable matching. Specifically, we define a new model, Online Stable Matching under Known Identical Independent Distributions (OSM-KIID). It not only maximizes the expected total profits (OBJ-1), but also tries to satisfy the preferences among workers and tasks by minimizing the expected total number of blocking pairs (OBJ-2). The model also features a practical arrival assumption validated on real-world dataset. Furthermore, we present a linear program based online algorithm LP-ALG, which achieves an online ratio of at least 1−1/e on OBJ-1 and has at most 0.6·|E| blocking pairs expectedly, where |E| is the total number of edges in the compatible graph. We also show that a natural Greedy can have an arbitrarily bad performance on OBJ-1 while maintaining around 0.5·|E| blocking pairs. Evaluations on both synthetic and real datasets confirm our theoretical analysis and demonstrate that LP-ALG strictly dominates all the baselines on both objectives when tasks notably outnumber workers.

Advances in Scientific Visualization of Geospatial Data with MATLAB

2020 ◽  
Author(s):  
Lisa Kempler ◽  
Steve Schäfer
Keyword(s):  
File Systems ◽  
Data Access ◽  
Geospatial Information ◽  
Web Map ◽  
High Resolution Mapping ◽  
Data Formats ◽  
Multiple Data ◽  
Resolution Mapping ◽  
Complex Relationships ◽  
Map Service

<p>Data visualization plays an essential role in conveying complex relationships in real-world physical systems. As geoscience and atmospheric data quantities and data sources have increased, so, too, have the corresponding capabilities in MATLAB and Mapping Toolbox for analyze and visualize them. The talk will present end-to-end geospatial analysis workflows, from data access to visualization to publication. The talk will include software demonstrations of how to process and visualize large out-of-memory data, including accessing remote and cloud-based file systems; working with multiple data formats and sources, such as Web Map Service (WMS), for visualizing of publicly accessible geospatial information; and applying new 2-D and 3-D high resolution mapping visualizations. MATLAB live notebooks combining code, pictures, graphics, and equations will show the use of interactive notebooks for capturing, teaching, and research sharing.</p>

scholarly journals The advancement of utilizing geospatial information via GSI Maps

2019 ◽  
Vol 1 ◽  
pp. 1-2
Author(s):  
Hirosato Mogi
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Open Data ◽  
Geospatial Information ◽  
Secondary Use ◽  
Web Map ◽  
Public Data ◽  
The Government ◽  
Map Data ◽  
Machine Readable

<p><strong>Abstract.</strong> The Geospatial Information Authority of Japan (GSI) is the national organization that has jurisdiction over the Survey Act, and develops geospatial information. We are also promoting utilization of them based on the Basic Act on the Advancement of Utilizing Geospatial Information. In addition, the Japanese government is promoting the Open Data initiative, in which the government widely discloses public data in machine-readable formats and allows secondary use of them. In accordance with these laws and initiative, we aim to realize a society where geospatial information can be widely and highly utilized by the disclosure of geospatial information. In order to achieve our mission, we are working on providing map data using “GSI Maps” (https://maps.gsi.go.jp/) which is a web map developed by using open source software (OSS) as the basis (Figure 1a). In this paper, we introduce “Three Open Policies” to promote utilizing geospatial information provided via GSI Maps.</p>

A new model for Last-Mile Delivery and Satellite Depots management: The impact of the on-demand economy

2021 ◽  
Vol 145 ◽  
pp. 102184
Author(s):  
Guido Perboli ◽  
Luce Brotcorne ◽  
Maria Elena Bruni ◽  
Mariangela Rosano
Keyword(s):  
New Model ◽  
On Demand ◽  
Last Mile ◽  
Last Mile Delivery ◽  
The Impact

Designing a New Model of Public Service Television (PST)

2018 ◽  
Author(s):  
Robin Foster
Keyword(s):  
Digital Media ◽  
Public Service ◽  
Public Interest ◽  
Electronic Media ◽  
New Model ◽  
The Public ◽  
On Demand ◽  
Tv News ◽  
Long Form ◽  
Over Time

This chapter argues that despite claims to the contrary, there is still a significant future role for public service television (PST). While long-form TV programming will remain at the heart of PST, whether on linear channels or on-demand, the concept of ‘television’ needs to be broadened to reflect new opportunities presented by digital media. TV news already benefits from the increased convenience and depth offered by online. Having invested in public service newsgathering, it is in the public interest to ensure that audiences can access that resource via a range of different electronic media. Likewise, other genres can be enhanced by an extra online dimension and, in some cases, online will largely replace conventional broadcast TV. PST purposes will endure, but the precise format and nature of content should be flexible enough to change over time to meet audience expectations.

Use and Users of Maps on the Web

2000 ◽  
pp. 34-50 ◽  
Author(s):  
Corné P.J.M. Van Elzakker
Keyword(s):  
Exponential Growth ◽  
User Profile ◽  
Global Distribution ◽  
The Internet ◽  
Geospatial Information ◽  
The Real ◽  
Web Map ◽  
Internet Users ◽  
To Come ◽  
The Web

Accessibility and actuality are presented here as the real benefits of the WWW medium for the dissemination of geospatial information through maps. In addition, the Web allows different modes of using web maps that address different map use goals. An argument is made that a great deal of web map use research will be required to develop more effective cartographic tools to better serve the needs of the users. Part of this research will have to be directed towards the characteristics of the web map users and the nature of their questions. Currently, we are witnessing a significant diversification of the user profile combined with an exponential growth of the total number of Internet users worldwide. The global distribution of the Internet is still very uneven, but there are now signs that the geographical anomalies will be somewhat reduced in the years to come. There are a number of other problems and limitations with which users are confronted in their use of maps on the web. However, the Web already is the major medium for the dissemination of maps and it has a great potential for further growth. But, this growth will have to be accompanied by cartographic research.

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