Topographical Mapping

Taking Land & areal Survey to the Next Level

alisteshaar have invested in the most advanced technologies to provide our clients with quick, cost-effective topographic mapping and land surveying services as a critical first step in the construction / development process.

  • We are packed with high-standard industry technologies.

  • Understanding the quality standards.

  • Trusted by the multi-international companies like FIG, LEICA, (hexagon) RICS, Topcon Positioning Systems, Autodesk, & ISO.

Elevation and Contour Lines

  • Hills, valleys, mountains, plains, and plateaus.
  • Water Bodies: Rivers, lakes, ponds, streams, and coastal features like beaches and bays.
  • Vegetation: Forests, grasslands, and other significant vegetation cover.
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Geographic and Geological Features

  • Soil and Rock Types: Basic surface composition or geological layers.
  • Slope Stability: For assessing risks in hilly or mountainous areas.
  • Drainage Patterns: Natural water flow systems.
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Mapping Methods

  • Traditional Surveying: Using theodolites, total stations, or leveling instruments.
  • Aerial Surveying: Using drones, aircraft, or satellites.
  • Photogrammetry: Extracting measurements from photographs.
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How Alisteshaar Conducts Topographical Mapping

Pre-Survey Planning & Preparation

Before heading to the field, we: Understand the project scope – Identify the client’s requirements, survey area, accuracy needs, and deliverables (contour maps, 3D models, GIS data). Gather existing data Review satellite imagery, GIS layers, or previous surveys to plan efficient coverage. Select appropriate equipment – Choose between GNSS receivers, total stations, drones, or LiDAR systems based on the terrain and accuracy required. Establish ground control points (GCPs) – Use precise GNSS measurements for geo referencing drone or LiDAR data.

Field Data Collection

Alisteshaar can use multiple methods based on the project’s scale and accuracy requirements:

A. GNSS & Total Station Survey (Traditional Approach)

Set up control points using RTK (Real-Time Kinematic) GNSS for high-accuracy positioning.

Measure elevation points at regular intervals using a total station.

Traverse & triangulate for mapping large or complex sites.

Suitable for small to medium sites, construction sites, and boundary surveys.

B. Drone-Based Aerial Photogrammetry

Deploy high-resolution drones for fast data capture over large areas.

Collect orthophotos and point cloud data with photogrammetry software.

Suitable for large sites, inaccessible areas, and quick turnarounds.

C. LiDAR Scanning (Mobile or Aerial LiDAR)

Utilize Leica LiDAR sensors mounted on a Jeep (Wrangler) for mobile mapping.

Use drone-mounted LiDAR for dense vegetation or complex terrains.

Generates high-density point clouds for accurate 3D terrain models.

Suitable for corridor mapping, infrastructure surveys, and large-scale projects.

Data Processing & Analysis

Once field data is collected, we process it to generate usable topographical maps:

Import GNSS & total station data into survey software (e.g., Leica Infinity, Civil 3D).

Process drone images using photogrammetry software (Pix4D, Agisoft Metashape).

Generate LiDAR point clouds and classify terrain features.

Create Digital Elevation Models (DEMs) & Contour Maps using GIS tools (ArcGIS, QGIS).

Cross-check accuracy with GCPs and perform quality control.

4. Deliverables & Client Reporting

After processing, we provide clients with:

Topographic contour maps (e.g., 1m, 5m intervals)

3D Terrain Models (TIN, DEM) for engineering use

Orthophoto mosaics for visualization

CAD & GIS files for integration with planning software

Elevation profiles & volume calculations for construction projects

Final Quality Assurance:

Conduct accuracy verification using check points.

Validate data consistency against reference benchmarks.

Prepare final reports with metadata, methodologies, and recommendations.