Queensland Drones specialises in contour mapping of greenfield development sites and construction sites in progress, providing bare earth contours at intervals of 1m, 0.5m or 0.25m, accurate to less than 0.5m even on heavily treed and steep sites.
Aerial contour mapping with precision ground control
For relatively open and bare earth sites, Queensland Drones recommends the use of drone-based mapping in conjunction with precision ground control points (GCPs) for maximum contour precision and maximum flexibility in how the outputs can be used to enhance your workflow.
Our drone-based mapping uses a 20 megapixel RGB camera which can provide an effective ground sampling distance (GSD) of less than 2 cm per pixel. To put this in context, an object 1m x 1m in our orthomosaic imagery will be represented as 50 pixels, compared to the typical resolution which would use only 20 pixels.
To enhance the precision of our aerial contour maps, we utilise Trimble satellite-based geolocation equipment which can precisely position ground control points to an accuracy of 0.05m horizontal and 0.1m vertical (depending on location and availability of satellites on the day).
These GCPs allow us to very detailed contour maps (1m, 0.5m or 0.25m as needed) as well as create 3D models and point clouds with geolocation precision below 0.2m. We can also provide digital terrain models (DTMs), digital elevation models (DEMs), digital surface models (DSMs) and cut/fill volume calculations from this data.
Queensland Drones can also provide boundary point mapping (precise locations for every node in a property boundary), contour boundary point mapping (precise geolocation for each point where a contour crosses a property boundary) and drainage line locations (precise path for primary and secondary water flows across a property).
Aerial contour mapping using Lidar data
Where drone-based contour mapping is not feasible, either because of weather conditions, time constraints, distance constraints, etc., Queensland Drones can create 1m contour maps using either current or archival Lidar data.
For 1m contour mapping, Queensland Drones can deliver maps in most areas using existing high-definition aerial topographical data typically less than 12 months old, so we are not constrained by distance or weather conditions. We can typically deliver 1m contour mapping in the following areas within 2-3 business days:
- Gold Coast
- Sunshine Coast
- Moreton Bay
- Scenic Rim
- Lockyer Valley
We can also deliver 1m contour maps in parts of Toowoomba, Western Downs, Southern Downs, Somerset and Noosa regions. We are constantly adding to our available map data, so please ask us about availability of mapping data for your area.
These 1m contour maps based on topographical data are useful for most planning purposes.
Our drone-based contour mapping can provide survey-grade contour maps with 0.5m or 0.25m contours to an accuracy of less than 0.2m, using photogrammetry and surveyed ground control points. Note that this mapping is not suitable for heavily treed sites as it relies on visibility of open ground on at least 20% of the site.
For more information about contour mapping and topographical mapping, please complete the enquiry form below, or contact us by phone or email.