Digital Aerial Survey (DAS) maps illustrate surface features present in an aerial photograph (e.g. buildings, public trees, curbs and gutters, manholes, catch basins, poles, elevation contour lines generated at 0.5 metre intervals.
Derived from 1:5000 aerial photos, DAS products show surface features and topography to within an accuracy of 15 centimetres vertically and horizontally.
Purchase area-specific DAS mapping products using CITYonline by:
- Use the tool bar tool Draw a Polygon to Digitize an area. Or Use the Select tool to highlight specific layer element, e.g. communities boundaries, etc.
- Click Download>Standard Spatial Data by Polygon or > Custom Spatial Data by Polygon choose Output Data Format and Coordinate system, then Add to Cart.
- Topographic maps
- Road design
- Land development
- Vegetation analysis
- Geotechnical/Hazardous slope mapping
- Base for analytical mapping
- Engineering design
- Emergency services
- Accurate - 15 cm accuracy makes DAS products suitable for engineering projects.
- Current – Growth areas are updated annually while established areas are updated on a 3-year cycle; extensive quality control procedures are conducted on an ongoing basis.
- Efficient – Immediate download available; licensing process is completed in minutes, not days.
- Cost effective – Obtaining a DAS map license saves the cost of developing an original map.
- Practical – DAS maps are sold per section base.
Digital Aerial Survey data is collected from 1:5000 scale aerial photography using photogrammetric technology to acquire planimetric and digital terrain model files. The features have a positional accuracy of +/-15 cm in Eastings, Northings, and Elevation. The initial data capture began in 1991. To keep pace with new developments, at least one flight is conducted annually, during which individual sections are checked and updated.
The planimetric and contour CAD files, both 2D and 3D, contain numerous features required by different departments for their business needs.