Abstract
Methods for creating multi-layered mapping representation for the real-time satellite monitoring systems, based on web-GIS technologies, are considered. The generated map can contain a set of raster and vector thematic layers of spatial data, additional information layers of images from below (a basic map - a substrate) and from above (a layer of labels) of user’s thematic data. The client software provides interactivity of the created maps in a standard web browser. The configuration of the data presentation provides the ability to select spatial data format according to the client (vector or raster), control various display options (interactive legend, list of fields displayed in attribute tables). It also provides application of custom templates to display table information on layer objects, arrangement of data access rights - from opportunities to visualize a layer or map through a web browser to providing direct access to them through standard mapping WMS/WFS web services, web-based editing, or shape-file downloads. An integral part of thematic web maps, based on the geo-portal, is a customized rasterization and data caching service that provides a noticeable performance increase for "heavy" multi-layer maps. A set of mapping substrates, such as schematic maps, satellite images mosaics, digital terrain models, spatial data of outside web services are a good addition to maps on geoportal.
Highlights
Development of land remote sensing systems is currently conditioned by a combination of such factors as an increase in the number of spacecrafts and improvement of their performance characteristics, an increase in the availability of satellite information related to the development of the Internet: increase in speed and decrease in cost of access, the development of Web services and standards for the transfer of geospatial data [1]
New technologies for automation of receiving and processing remote sensing data, creation of super-large archives in specialized data centers have made it possible to arrange fundamentally new ways for satellite data operations, and to create a new generation of systems for real-time monitoring of the natural environment [2,3,4]. They are based on the geo-information web technologies, interactive online mapping systems with direct access to satellite information, provided with the ability to configure various parameters for visualizing geospatial data and generating complex analytical queries
Up-to-date web GIS are built in the so-called service-oriented architecture, and they can be considered as a set of interrelated software tools for arranging spatial data such as import/export, cataloging, visualization, creation, processing, distribution, etc
Summary
Development of land remote sensing systems is currently conditioned by a combination of such factors as an increase in the number of spacecrafts and improvement of their performance characteristics, an increase in the availability of satellite information related to the development of the Internet: increase in speed and decrease in cost of access, the development of Web services and standards for the transfer of geospatial data [1]. New technologies for automation of receiving and processing remote sensing data, creation of super-large archives in specialized data centers have made it possible to arrange fundamentally new ways for satellite data operations, and to create a new generation of systems for real-time monitoring of the natural environment [2,3,4] They are based on the geo-information web technologies, interactive online mapping systems with direct access to satellite information, provided with the ability to configure various parameters for visualizing geospatial data and generating complex analytical queries. The basic trend now is the use of the workplace of the GIS solution’ end user, based on a web browser, as well as embedding the necessary set of scripts to work with the system in geo-information Internet portals In some cases, these solutions are auxiliary and perform mostly spatial data viewing functions [8,9,10]
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