The following dialog allows for selection of tables to be created. Users create new tables using Database -> Create River Database Tables or tool. There are three tables always required for a model creation: river lines, cross-sections and flow paths. If a table needs a user specified attribute, it is given in the User defined attributes column. For example, if a terrain model does not contain enough detail to define the.
![merge two cross sections hec ras merge two cross sections hec ras](https://www.researchgate.net/profile/Orkan-Ozcan-2/publication/348231284/figure/fig5/AS:979182213402630@1610466640937/HEC-RAS-analysis-results-indicating-a-the-obtained-cross-sections-and-the-bridge.png)
The table below lists river database tables created by RiverGIS. The Merge tab allows two cross sections to be merged. Deleting Portions of HEC-RAS Cross Sections Quickly. There is a table for river lines, cross-sections etc. Model geometry data are stored in a river database tables. In the ground surveyed geometry file, you’ll want to interpolate cross sections so that you have a matching cross section for each DTM-created cross section. When a schema is created from outside the RiverGIS use the Database > Refresh Connections List or the tool. One with only the ground surveyed cross sections, and one developed from the DTM. If a connection or schema was created in a previous session, it can be chosen from the DB Connection or Schema dropdown lists. A digital terrain model is subsequently synthesized by merging. RiverGIS will automatically switch to the newly created schema, as shown below. HEC-RAS cross sections and flood maps can be created easily and effortlessly using GeoHECRAS. Users can create a schema in a number of ways: using pgAdmin, QGIS’ own DB Manager or from within RiverGIS dialog by choosing Database > Create New Schema or clicking tool icon from Database toolbar.
![merge two cross sections hec ras merge two cross sections hec ras](https://www.civilgeo.com/wp-content/uploads/sites/3/2015/01/Cross-Section-Velocity-Distribution-Plot.png)
Therefore, the first step is to create a new schema for a model. Each model goes to its own schema, a kind of database directory for data grouping. Until a database and schema are set in RiverGIS window, most of the tools are inactive.Ī single PostgreSQL database can be used to store many models geometries.
![merge two cross sections hec ras merge two cross sections hec ras](https://www.civilgeo.com/wp-content/uploads/Extract-CrossSectionGeometry.png)
A term river database refers to a database used by RiverGIS. A fundamental difference from HEC-GeoRAS is that the RiverGIS uses a PostgreSQL database with PostGIS spatial extension for data storage (see Requirements for installation instructions).