Free Terrain Analysis Tool: Elevation, Slope, and Aspect for Any Location

Terrain analysis is fundamental to land development, civil engineering, agriculture, and environmental planning. Understanding the elevation, slope angle, aspect direction, and hydrological characteristics of a site helps determine its suitability for construction, farming, renewable energy, or conservation. Traditionally, this analysis requires downloading Digital Elevation Models (DEMs) and processing them in GIS software. PixelGust makes it instant.

Terrain Data Available

Understanding Each Variable

Elevation

Elevation data is essential for site characterization. It affects temperature (roughly -6.5 degrees C per 1000m), air pressure, vegetation patterns, and flood exposure. Low-lying areas are more vulnerable to flooding, while high-elevation sites face increased wind exposure and lower temperatures.

Slope

Slope determines surface water runoff, erosion potential, and construction feasibility. Building codes typically limit construction on slopes exceeding 15-20 degrees. For solar farms, slopes under 5 degrees are preferred. Agricultural land is most productive on gentle slopes (under 8 degrees).

Aspect

Aspect describes which direction a slope faces. In the Northern Hemisphere, south-facing slopes receive the most sunlight (important for solar energy and agriculture), while north-facing slopes are cooler and retain more moisture. In the Southern Hemisphere, this is reversed.

Topographic Wetness Index (TWI)

TWI predicts where water naturally accumulates in the landscape. High TWI values indicate areas where surface water collects, making them poorly suited for construction but potentially good for wetland conservation or irrigation infrastructure.

Use Cases

Land Development and Construction

Before purchasing land for development, assess slope and elevation to determine construction feasibility. Sites with steep slopes require expensive earthworks, while sites with high TWI may need drainage solutions. PixelGust gives you this information before you visit the site.

Solar Farm Layout

Solar developers use slope and aspect data to optimize panel placement. South-facing hillsides (in the Northern Hemisphere) with gentle slopes are ideal. Combined with PixelGust's solar radiation data, you get a complete picture of solar potential.

Agricultural Suitability

Terrain characteristics strongly influence agricultural productivity. Gentle slopes with good drainage (moderate TWI) and south-facing aspects tend to be the most productive. Combined with climate and NDVI data from PixelGust, you can assess agricultural potential comprehensively.

Road and Infrastructure Planning

Civil engineers use terrain data to plan road alignments, pipeline routes, and utility corridors. Slope and aspect data help identify the most cost-effective paths that minimize earthworks and environmental impact.

Polygon Mode for Area Assessment

When evaluating a large site, use PixelGust's polygon mode to draw the area boundary. You will get the min, mean, and max values for elevation, slope, and TWI across the entire site. This gives you a quick overview of terrain variability that would otherwise require extensive GIS processing.

Data Source

Terrain data in PixelGust comes from the Copernicus DEM GLO-90, processed to 250m resolution. The Copernicus DEM is produced by the European Space Agency from TanDEM-X radar satellite data and is one of the most accurate freely available global elevation models. Slope, aspect, and TWI are derived from the elevation data using standard geomorphometric algorithms.