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Spatial Planning and Exergy – Design and Optimization
Published in Evanthia A. Nanaki, George Xydis, Exergetic Aspects of Renewable Energy Systems, 2019
One of the most common programs utilized, the QGIS program, is a free and open source geographic information tool, which creates, edits, visualizes and publishes geospatial information, available for any user and any operation system. There is a variety of documentation, guides, tutorials and manuals online, so anyone with basic software understanding ability can easily learn how to use QGIS, in order to elaborate spatial data.
Acquiring Data: EarthExplorer, GloVis, LandsatLook Viewer, and NRCS Geospatial Data Gateway
Published in Stacy A. C. Nelson, Siamak Khorram, Image Processing and Data Analysis with ERDAS IMAGINE®, 2018
Stacy A. C. Nelson, Siamak Khorram
Quantum GIS (QGIS) is an open source package that possesses many geospatial processing features that are used for processing both vector and raster data, as well as developing sophisticated spatial analysis models. The uniqueness of this application package is that it is freely available, and the functionality continues to expand.
An improved coverage-oriented retrieval algorithm for large-area remote sensing data
Published in International Journal of Digital Earth, 2022
Xuejing Yan, Shibin Liu, Wei Liu, Qin Dai
PyQGIS is a Python-based QGIS library. QGIS is a user-friendly open-source desktop software that can run on platforms such as Linux, Unix, Mac OSX, and Windows. It is a cross-platform open-source desktop geographic information system based on the cross-platform graphics tool Qt software package, and it was developed using C++. The main features of QGIS software are as follows: Supports multiple GIS data file formats; can support up to dozens of data formats through GDAL/OGR extension;Supports PostGIS database;Support in retrieving data from WMS, WFS server.Integrates some functions of GRASS GIS;Supports basic operations on GIS data, such as editing and modifying attributes;Supports the creation of maps;Supports function expansion in the form of plug-ins.
Depth-to-water maps as predictors of rut severity in fully mechanized harvesting operations
Published in International Journal of Forest Engineering, 2022
J. B. Heppelmann, B. Talbot, C. Antón Fernández, R. Astrup
In order to assess the location, density, and severity of wheel ruts, the created ortho-mosaics were imported into QGIS (v3.10.0). QGIS is an open-source GIS software, developed to manipulate, view, edit, and analyze geospatial data (QGIS Development Team 2020). Within this software platform, the wheel ruts were identified and visually classified. Due to the clear-cut character of the harvesting operation the visibility of the tracks was obvious throughout the sites. Previous studies proved the applicability of photo-optical recording measures to identify wheel ruts on clear cuts and were used as the basis for this research (Pierzchała et al. 2016; Talbot et al. 2018). The tracks were traced as polylines and visually classified into three categories: light, moderate, and severe (Figure 3). The light category was defined as visible tracks with no identifiable soil displacement or rut-formation. Tracks that showed rutting with minor soil displacement and deeper incisions, but no loss of water drainage functions were classified as moderate. As severe ruts, all tracks were classified that showed either major soil displacement, very deep incisions, loss of water drainage functions, or a combination of these factors. In cases where the degree of severity was unclear, the QGIS profile tool was used on the DEM, providing a high-resolution transverse profile of the rut. For better visibility, the categories were further displayed with a corresponding color code of green (light), yellow (moderate), and red (severe) (Figure 4).
A Review of Spatial Big Data Platforms, Opportunities, and Challenges
Published in IETE Journal of Education, 2020
ArcGIS is a proprietary leading mapping and analytics platform with a rich set of functionalities provided by ESRI [10]. QGIS, on the other hand, is a free and open source geographic information system [11]. The GIS systems have evolved from Desktop GIS to Server GIS to Web GIS. The Desktop GIS system is a standalone application that can handle small-sized spatial data in shapefile file format. The shapefile format is an open standard that supports interoperability between different GIS applications. The focus of this system is geographic coordinate representation of spatial data and interactive visualization tools for map reading. In Server GIS, the file storage is replaced by a spatial database server at the back end. Server GIS is a multi-user system based on client server architecture, as shown in Figure 2, which can serve multiple spatial data applications. It can handle more data than monolithic Desktop GIS. The Web GIS is a Server GIS providing access to spatial data in a web portal using an online map server. The Google Map is an example of massive scale Web GIS.