Mott MacDonald are at the forefront of developing
new techniques in digital terrain mapping using low level LiDAR,
which allows flood defence assets to be surveyed accurately and
quickly from the air.Mott MacDonald have developed an
inter-disciplinary approach to remote sensing, which enables the
technology to be used with more traditional reporting methods.
We have built up extensive knowledge of Remote Sensing data
processing; from building topographic models from LiDAR and SAR
data, to the classification of multi-spectral imagery. This leading
edge technology is used in conjunction with GIS for a number of
services.
These include:
- Flood embankment monitoring
- Environment resource mapping and analysis
- Habitat, socio-economic and development mapping and
analysis
- Land classification and risk assessment
Flood embankment monitoring
We assess the maintenance and height of sea and river defences
using Low Level LiDAR, ortho-rectified high resolution aerial
photography and intensity data, acquired from a helicopter
platform.
Cadastral mapping
We map remote landscapes using high resolution satellite imagery as
an effective and efficient method of providing background
information including field boundaries for a site. This process
reduced the requirement for field surveys, is cost-effective and
can be particularly useful in hazardous countries.
Land classification
We classify land-cover from multi-spectral satellite data for use
when assessing the social and environmental impact of hazards. By
altering the combination of bands, the resulting classification can
be tailored to specific project parameters.
Digital Terrain Model (DTM) & Digital Surface Model
(DSM)
One of the principle products required for inundation studies is an
accurate presentation of the underlying topography. Only rarely can
a DTM with sufficient accuracy be produced from contour maps and
topographic survey cross sections alone. Typically more accurate
inundation mapping is required for dictated by flat or gentle
topography downstream. Mott MacDonald is skilled in interpreting
and manipulating photogrammetry, LiDAR, Synthetic Aperture Radar
and ground survey data to create Digital Terrain Models.
