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Users can graphically select and evaluate SRTM tiles, save them as PNG files, and analyze elevation data. The application supports both SRTM3 (3 arc-second resolution) and SRTM1 (1 arc-second resolution) files.\n\n## Core Features\n\n| Feature                        | Description                                                                 |\n|-------------------------------|-----------------------------------------------------------------------------|\n| SRTM3 \u0026 SRTM1 Support         | Loads both 3 arc-second (~90m) and 1 arc-second (~30m) .hgt files          |\n| **Worldwide Tile Grid Overlay**       | Interactive map with full 1°×1° SRTM tile grid clearly displayed and color-coded by availability |\n| Heightmap PNG Export          | 16-bit grayscale or colored heightmaps (with customizable color ramps)     |\n| **Wavefront OBJ Export**      | **Blender-ready** high-quality triangulated mesh |\n| **POV-Ray Scene Export**      | Generates ready-to-render `.pov` + `.png` files with height_field terrain, camera, lighting, and atmospheric effects |\n\n## Screenshots\n![Application Screenshot](https://github.com/NeuralCortex/SRTM_Viewer/blob/main/images/srtm.png)\n\n![Blender Screenshot](https://github.com/NeuralCortex/SRTM_Viewer/blob/main/images/blender.png)\n\n## Requirements\n\n- A stable internet connection is required to run the application.\n- Java Runtime Environment (JRE) or Java Development Kit (JDK) version 24 is required.\n- JavaFX SDK is necessary for GUI functionality ([JavaFX](https://gluonhq.com/products/javafx/)).\n\n## File Structure\n\nSRTM files (`.hgt`) contain 16-bit signed integer values representing elevation data, with no header or trailer. File names follow the format `N50E010.hgt`.\n\n### SRTM3 Tile (1x1 degree)\n```\nNorth X=0,Y=1200 ********************* X=1200,Y=1200\n                 *********************\n                 *********************\n                 *********************\nSouth X=0,Y=0    ********************* X=1200,Y=0\n                 West             East\n```\n\n### SRTM1 Tile (1x1 degree)\n```\nNorth X=0,Y=3600 ********************* X=3600,Y=3600\n                 *********************\n                 *********************\n                 *********************\nSouth X=0,Y=0    ********************* X=3600,Y=0\n                 West             East\n```\n\n## Usage Instructions\n\n### Tab 1: Tile Selection\n- Move the mouse over the map to select an SRTM tile (e.g., for a specific city).\n- Displays tile boundaries, file name, northern/southern longitude, and elevation.\n- Accounts for Earth's curvature in calculations.\n- Calculates the tile's area in square kilometers.\n\n### Tab 2: Grid View\n- Visualize `.hgt` files from a local directory as a grid on OpenStreetMap.\n- File names appear at a certain zoom level.\n- Two tables on the right allow showing or hiding individual tiles or entire regions.\n- Grid view uses only file names, not file contents.\n- Store files in a single folder without subdirectories (e.g., `Europe`, `Asia`, `North America`, `Japan`).\n\n### Tab 3: Graphical Analysis\n- Import an SRTM3 or SRTM1 tile for color-coded visualization based on a configurable color table.\n- Edit the color table to adjust tile coloring; changes are saved to the configuration file.\n- At higher zoom levels, hover to display elevation in meters above sea level.\n- Enable the alpha channel for semi-transparency to view underlying map features (e.g., cities or highways).\n- Right-click to place a marker; copy/paste longitude and latitude from Google Maps using `CTRL+V` to update coordinates.\n- Save options:\n  - Export the tile as a black-and-white elevation profile or colored PNG (with or without a marker).\n  - Preview is provided before saving; markers outside the tile are ignored.\n- 3D visualization via POV export:\n  - Generates a black-and-white elevation profile and a POV file for the [POV-Ray](http://www.povray.org/) ray tracer.\n  - Set POV-Ray image size to at least Full HD (1920x1080 pixels).\n- 3D visualization via Blender export:\n  - Generates a clean, high-quality Wavefront `.obj` (opens perfectly in Blender without any fixes).\n  - Triangulated mesh\n  - Ready for immediate rendering, texturing (satellite imagery, procedural materials), animation, or 3D printing.\n  - Recommended import settings in Blender: just drag \u0026 drop or File → Import → Wavefront (.obj) — no rotation or scale fixes needed.\n\n## Technologies Used\n\n- **IDE**: Apache NetBeans 27 ([NetBeans 27](https://netbeans.apache.org/))\n- **Java SDK**: Java 24 ([JDK 24](https://www.oracle.com/java/technologies/downloads/#jdk24-windows))\n- **GUI Development**: Gluon Scene Builder ([Scene Builder](https://gluonhq.com/products/scene-builder/))\n- **Framework**: JavaFX ([JavaFX](https://gluonhq.com/products/javafx/))\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fneuralcortex%2Fsrtm_viewer","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fneuralcortex%2Fsrtm_viewer","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fneuralcortex%2Fsrtm_viewer/lists"}