Elevation Query and Contour Generator - Online Terrain Analysis Tool

First, use the map navigation controls (zoom, pan) to browse to your area of interest. You can quickly locate by entering place names, coordinates, or addresses in the search box, or click the "Current Location" button to jump to your location. The map supports multiple basemap styles, which can be switched between satellite imagery or terrain maps as needed.

Use the mouse wheel or touchpad gestures to quickly zoom the map. Hold the Shift key while dragging the mouse to select an area for zooming.

Click any location on the map to query the precise elevation data for that point. The system will display the point's elevation (meters), latitude and longitude coordinates, and related terrain information. You can add markers to save important locations or copy coordinates for other uses.

When hovering the mouse over the map, it will display the elevation of the current position in real-time, making it convenient to quickly browse area elevation changes.

If you need to query elevations for multiple points, you can prepare CSV, GeoJSON, or KML files containing latitude and longitude coordinates, then click the "Upload Point File" button to import. The system will automatically process the file and query the elevation for each point, while providing statistical analysis (highest point, lowest point, average elevation, etc.).

CSV files should include longitude and latitude columns (optional header row). GeoJSON and KML files need to contain point features. Ensure the coordinate system is WGS84 before uploading.

After selecting your area of interest, adjust parameters in the contour settings panel: contour interval (meters), color style, line width, and smoothness. Then click the "Generate Contours" button, and the system will process the DEM data in the area and draw contour lines. You can choose different color gradient schemes to enhance the visual representation of the terrain.

Smaller contour intervals can show more details but may result in overly complex images. It's recommended to adjust appropriate intervals based on the terrain undulation degree of the area.

Click the "Enable 3D Terrain" button to switch the map to three-dimensional view mode. In 3D mode, you can rotate the perspective by dragging to observe the three-dimensional features of the terrain. Use the terrain exaggeration slider to enhance the visual effect of height differences, particularly suitable for displaying subtle terrain changes in relatively flat areas.

In 3D mode, hold the Ctrl key while dragging to adjust the perspective tilt; hold the Alt key while dragging to rotate the view direction.

Click the "Draw Profile Line" button, then draw a path on the map (can be a straight line or multi-segment line). The system will automatically generate an elevation profile for that path, showing elevation changes along the way. The profile includes information such as distance, height, and slope, which can help you analyze terrain features or plan routes.

Moving the mouse on the profile will display a marker at the corresponding position on the map, helping you correlate points on the profile with actual geographic locations.

After completing the analysis, you can download the contour map (PNG, PDF formats), elevation data (CSV, GeoJSON formats), or profile chart (PNG, SVG formats). Click the "Share Map" button to generate a link containing the current view and analysis results, making it easy to share your findings or plans with others.

Exported contour maps include coordinate reference information and can be imported into other GIS software for further analysis or overlay with other data layers.