Difference between revisions of "Fire spread through cost path analysis in QGIS GRASS"
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=== Data and available platforms === |
=== Data and available platforms === |
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| − | QGIS is a free and open source geographic information system. The current version of QGIS is 2. |
+ | QGIS is a free and open source geographic information system. The current version of QGIS is 2.18015 ‘Las Palmas’ that was released on August 12th, 2017. QGIS is available for a variety of platforms including Windows, Mac OS, Linux and Android. Various releases for download can be found at the [http://www.qgis.org/en/site/forusers/download.html QGIS website]. |
Digital elevation models (DEM) are used for hydrological analyses. DEMs can be generated using point data sets from elevation data or from aerial imagery using remotely sensed data [http://gracilis.carleton.ca/CUOSGwiki/index.php/Exploring_the_Hydrological_Tools_in_QGIS#Literature_Cited (NRCAN, 2013)]. Downloading a point data set would generally require interpolation of the data to create a DEM. Interpolation of a DEM will not be discussed in this tutorial. Instead, we will explore the hydrological toolset using a DEM that has previously been interpolated. |
Digital elevation models (DEM) are used for hydrological analyses. DEMs can be generated using point data sets from elevation data or from aerial imagery using remotely sensed data [http://gracilis.carleton.ca/CUOSGwiki/index.php/Exploring_the_Hydrological_Tools_in_QGIS#Literature_Cited (NRCAN, 2013)]. Downloading a point data set would generally require interpolation of the data to create a DEM. Interpolation of a DEM will not be discussed in this tutorial. Instead, we will explore the hydrological toolset using a DEM that has previously been interpolated. |
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Revision as of 17:22, 15 December 2017
Purpose
Introduction
Materials and methods
Data and available platforms
QGIS is a free and open source geographic information system. The current version of QGIS is 2.18015 ‘Las Palmas’ that was released on August 12th, 2017. QGIS is available for a variety of platforms including Windows, Mac OS, Linux and Android. Various releases for download can be found at the QGIS website.
Digital elevation models (DEM) are used for hydrological analyses. DEMs can be generated using point data sets from elevation data or from aerial imagery using remotely sensed data (NRCAN, 2013). Downloading a point data set would generally require interpolation of the data to create a DEM. Interpolation of a DEM will not be discussed in this tutorial. Instead, we will explore the hydrological toolset using a DEM that has previously been interpolated.
A DEM of the southeastern quadrant of the outskirts of Ottawa, Ontario was used for the purpose of this tutorial. Data were obtained from the GIS Library of Carleton University using a 3-dimensional raster data set from the Ontario Ministry of Natural Resources. The data capture terrain elevations and cover the province of Ontario with a cell resolution of 30 cm.
Additional data sources can be found from Natural Resources Canada, Geogratis and from the Ontario Ministry of Natural Resources.
