SRTM-Viewer 1.1.0

Overview

SRTM-Viewer is a JavaFX application designed to visualize and analyze topographical data from NASA's Shuttle Radar Topography Mission (SRTM) STS-99. 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.

Requirements

• A stable internet connection is required to run the application.
• Java Runtime Environment (JRE) or Java Development Kit (JDK) version 24 is required.
• JavaFX SDK is necessary for GUI functionality (JavaFX).

File Structure

SRTM files (.hgt) contain 16-bit signed integer values representing elevation data, with no header or trailer. File names follow the format N50E010.hgt.

SRTM3 Tile (1x1 degree)

North X=0,Y=1201 ********************* X=1201,Y=1201
                 *********************
                 *********************
                 *********************
                 *********************
South X=0,Y=0    ********************* X=1201,Y=0
                 West             East

SRTM1 Tile (1x1 degree)

North X=0,Y=3601 ********************* X=3601,Y=3601
                 *********************
                 *********************
                 *********************
                 *********************
South X=0,Y=0    ********************* X=3601,Y=0
                 West             East

Usage Instructions

Tab 1: Tile Selection

• Move the mouse over the map to select an SRTM tile (e.g., for a specific city).
• Displays tile boundaries, file name, northern/southern longitude, and elevation.
• Accounts for Earth's curvature in calculations.
• Calculates the tile's area in square kilometers.

Tab 2: Grid View

• Visualize .hgt files from a local directory as a grid on OpenStreetMap.
• File names appear at a certain zoom level.
• Two tables on the right allow showing or hiding individual tiles or entire regions.
• Grid view uses only file names, not file contents.
• Store files in a single folder without subdirectories (e.g., Europe, Asia, North America, Japan).

Tab 3: Graphical Analysis

• Import an SRTM3 or SRTM1 tile for color-coded visualization based on a configurable color table.
• Edit the color table to adjust tile coloring; changes are saved to the configuration file.
• At higher zoom levels, hover to display elevation in meters above sea level.
• Enable the alpha channel for semi-transparency to view underlying map features (e.g., cities or highways).
• Right-click to place a marker; copy/paste longitude and latitude from Google Maps using CTRL+V to update coordinates.
• Save options:
  • Export the tile as a black-and-white elevation profile or colored PNG (with or without a marker).
  • Preview is provided before saving; markers outside the tile are ignored.
• 3D visualization via POV export:
  • Generates a black-and-white elevation profile and a POV file for the POV-Ray ray tracer.
  • Set POV-Ray image size to at least Full HD (1920x1080 pixels).

Technologies Used

• IDE: Apache NetBeans 27 (NetBeans 27)
• Java SDK: Java 24 (JDK 24)
• GUI Development: Gluon Scene Builder (Scene Builder)
• Framework: JavaFX (JavaFX)