Terrain, Slopes and Drainage

We produce maps of elevation, slope, aspect and terrain morphology.

• Terrain Slope and Aspect Map

  Examine basic topography at a site.

  Expected deliverables: Slope and aspect GeoTIFFs and PDF map with class table.

• Shaded Relief Map and Elevation Contours

  Make the form of the terrain easy to read.

  Expected deliverables: Shaded relief/hypsometry map as PDF/PNG with sources and scale.

• Advanced Geomorphometric Mapping

  Characterize terrain relief and landforms.

  Expected deliverables: Topographic position index in GeoTIFF with formula and scale; geomorphometric curvature and profile maps in GeoTIFF with parameters; SAGA–QGIS/GRASS comparison in CSV or MD.

• Slope Classification into Agreed Ranges

  Locate terrain areas within specified slope ranges.

  Expected deliverables: Classified raster, slope-range polygons and area by class.

• Terrain Roughness and Geomorphological Exposure Map

  Map steeper surfaces to inform a preliminary assessment.

  Expected deliverables: Roughness/aspect raster, explanatory map and parameter table.

We identify potential surface-water flow paths from terrain gradients and forms.

• Preliminary Surface Flow and Drainage Maps

  Identify potential water-flow paths.

  Expected deliverables: Conditioned digital elevation model (DEM) in GeoTIFF with a change raster; alternative drainage network for comparison in GPKG or GeoTIFF.

We derive estimated watershed boundaries and drainage networks from digital elevation models.

• Preliminary Watershed and Runoff Analysis

  Understand drainage from elevation models.

  Expected deliverables: Flow-accumulation raster in GeoTIFF with threshold and configuration; delineated catchment polygons in GeoPackage with a report; derived hydrological network as GeoPackage lines with a table.

• Mapping the Hierarchy of a Derived Drainage Network

  Organize a preliminary drainage network by segments and associated basins.

  Expected deliverables: Ranked stream network in GPKG, accompanied by a stream-order raster and map.

We calculate elevation profiles, changes in height and indicative volumes from digital surfaces.

• Indicative Volume Calculation from a Surface Model

  Estimate volumetric differences between a surface and a reference elevation.

  Expected deliverables: Indicative volume table, parameters and surface map.

• Descriptive Elevation Profile Along a Route

  Use a line and DEM to create an indicative elevation profile.

  Expected deliverables: Profile chart, sample CSV and geographic alignment.

We map estimated shadow and solar exposure for specified terrain geometries and times.

• Technical Analysis of Urban Shadow and Solar Radiation

  Understand estimated spatial differences in solar exposure.

  Expected deliverables: Hourly shadow-projection map in GeoTIFF or PNG with parameters; simulated urban-radiation raster in GeoTIFF with a CSV of inputs; weather-scenario sensitivity table in CSV or MD.

• Preliminary Shading Map for Selected Dates

  Compare terrain visibility from shadows using documented parameters.

  Expected deliverables: Shadow series and illumination parameters; not an energy study.

We check digital elevation models for errors, discontinuities and limitations relevant to their use.

• Audit of a Supplied Digital Elevation Model

  Check voids, NoData, ranges and continuity before analyzing a surface.

  Expected deliverables: DEM QA report, void mask and anomaly map.