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Where can I download the QGIS flood risk assessment?
The dataset is hosted on the Open Data Canada website here: ( https://open.canada.ca/data/en/dataset/957782bf-847c-4644-a757-e383c0057995 ); specific download instructions are provided in the next section, below, but first we’ll review different forms of elevation data models.
Can you do route analysis with PostGIS geospatial database?
It adds routing capabilities and network analysis functionalities to the PostGIS geospatial database. You can perform different network analysis, shortest paths, driving distances, service areas on a topological corrected network.
How to do simple route analysis with pgRouting and QGIS?
Simple route analysis with pgRouting and QGIS Simple route analysis with pgRouting and QGIS pgRouting is an extension of PostGIS (geospatial database), which in turn, is an extension of PostgreSQL database system. It adds routing capabilities and network analysis functionalities to the PostGIS geospatial database.
What kind of data is used in flood risk assessment?
The primary source of data used for this analysis will be the High Resolution Digital Elevation Model (HRDEM) – CanElevation Series, produced by Natural Resources Canada for the city of Peterborough.
How to calculate Dem in hydrological analysis QGIS?
Select the DEM in the Elevation field, and leave the default values for the rest of parameters. Some algorithms calculate many layers, but the Catchment Area one is the only one we will be using. You can get rid of the other ones if you want. The rendering of the layer is not very informative.
How does sink fill work in QGIS DTM?
In this step, the Sink Fill (Wang & Liu) tool will be used from the QGIS toolbox. The tool will sequentially fill any significantly low pixels in the DTM where the flow of water could accumulate incorrectly ( this is generally used to remove sinks from hydrologic analyses ).
What can catchment area be used for in QGIS?
Calculating the logarithm of the catchment area value yields a layer that conveys much more information (you can do it using the raster calculator). The catchment area (also known as flow accumulation), can be used to set a threshold for channel initiation.