HYDRO-GIS is a gis software

My goal with the GIS component was to amalgamate the best ideas that the two main open-source software had to offer, while also adding my own touch.

• From GRASS GIS, I adopted the concept of a ‘closed’ system, meaning the use of internal folders to store maps and a single reference system for each project. This drastically reduces unexpected situations, thus minimizing errors, bugs, malfunctions, permission issues for data operations, and errors within and between different map reference systems, etc.

• From QGIS, on the other hand, I took the idea of creating a beautiful, modern, user-friendly interface with non-blocking operations. In the fifth version, hydro-gis went above and beyond, introducing a fantastic Ribbon Bar and drag-and-drop functionalities, along with the customization of various interface panels, reaching the standard of the most advanced commercial programs.

• On my part, I developed a simple and effective system for downloading online basemaps from various sources. I implemented a system for displaying large raster files through the creation of a raster pyramid combined with tile techniques and added an extremely simple system for creating and exporting views, and many, many other things you will find out.

In general, the software allows loading of raster and vector maps, displaying their overlay, and customizing their graphical attributes (colormaps, opacity, colors, etc…).

Downloading maps from the internet has never been so easy. Hydrogis offers the ability to download various basemaps for free, provided there’s an internet connection. These basemaps are truly fantastic and include maps from OpenStreetMap, Esri, Stadia/Stamen, Cyclosm, OpenWeatherMap, NASA, and many others. You can either download static basemaps or dinamic basemaps such as manage the WMS layers.

The software enables the addition of various graphical elements, such as the north arrow, scale bar, custom texts, directional arrows, lines, indicators (such as pointers, icons, shapes) and images in format .png or .jpg. It thus allows for the creation of ‘views’ which can be saved and reloaded later. These views can then be saved as .png or .pdf files.

Finally, the software supports numerous raster and vector operations, listed in the box to the right. For most of these features, the software relies on third-party Python libraries, which are secure, reliable, and maintained by active developer communities.

So, even if you’re looking for a simple GIS software and are not interested in hydrology and hydraulics, you’ll find in Hydrogis a simple, intuitive, and intelligently designed software.

Supported raster operations: Import raster from project, merging, clipping, format conversion, raster calculator (arithmetic, conditional and indicial operation with and between rasters), geomorphological analysis: contour lines, slopes, aspect, and hillshade, raster profile along a line, 3D raster plot, reclassification, rasterization, extraction of statistics (report), setting the “no-data” value, and creation of raster pyramid and tiles and finally reprojection and/or extraction of a raster.

Supported vector operations: Import vector from project, joining (concat), join by keys (merge), spatial join (sjoin), clipping, overlay (union, difference, intersection), vectorization, extraction of raster statistics into vector geometries, creation of new vectors, viewing/editing of the attribute table (field calculator, selection with expression, spatial selection, ecc…), reprojection and/or extraction of a vector.

Moreover, there are numerous geometric operations available: buffer, centroids, simplify vector, dissolve, segmentation, offset curve, unary union, explode, remove repeated points, convex polygon, concave polygon, extract vertices, Delaunay triangles, Voronoi polygons, envelope, from lines to polygons, from polygons to lines.

Finally, drawing tools are available for adding/deleting/modifying geometries of vector files.

It is a hydraulics software

The hydro-gis software third and final section focuses on the hydraulic component, enabling the application of the finite volume method for simulating flood events in rivers and streams.

Two models are supported by the system: the fixed-bed model and the mobile-bed model. Decoupled, the mobile-bed model is less suitable for events with high solid transport, such as debris flows, but highly effective for simulating standard flooding in rivers and streams.

As previously mentioned, both models use the finite volume method for solving the Saint-Venant equations, calculating flows with a Riemann-type solver, in two steps. More specifically, for the calculation of flows, it employs the WAF-TVD method of the second order on a Cartesian grid. For the estimation of solid transport, it uses the Meyer-Peter-Muller formula.

Finally, regarding the calculation of the source term, it uses an implicit Crank-Nicolson type solver.

For further explanations about the matematical model: https://hydro-gis.com/saint-venant-metodo-ai-volumi-finiti/

Hydrodynamic operations supported:
Fixed-bed flood event simulation, mobile-bed simulation, results visualization 2D, customize raster visualization 2D, 3D results visualization.