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We can
provide two
basic types of DEM: Digital Terrain Models
(DTMs) describing
"bare-earth" terrain, and Digital Surface Models (DSMs)
describing "full-featured" surfaces that include
vegetation and infrastructural features.
We are experienced with
...
-
data format
conversion,
- horizontal and
vertical datum adjustment,
- interpolation
applied to: resolution
reduction, no-data-hole filling,
feature removal, contour
generation,
- cartography, 3D
Geo-animation,
and comprehensive GIS implementation
services
with the
following data sources
...
- GTOPO30, Global Topography with 30 arc
second ( ~1,000
m) DTM with a vertical accuracy of LE90 = 30 m.
Archive coverage is Global.
- SRTM, (Shuttle Radar Topography
Mission) 3 arc
second (~ 93 m) DTM with a vertical accuracy of LE90 =
16 m. Archive coverage is
Global.
- Stereo Satellite
Imagery, DTM and DSM options
with spatial resolution ranging from 3 m to 30 m and
vertical accuracy ranging from LE90 = 3 m to 10
m. Global archive coverage
from ASTER only, DEMs derived from all other
systems may likely require special
tasking.
- NED, (National Elevation
Dataset): 1
arc second (10 m) DTM with an overall vertical
accuracy of LE90 = 5 m. Archive coverage
includes all US territories.
- Lidar, (Light Detection and
Ranging):
DTM and DSM options with sub-meter spatial resolution
and vertical accuracy down to LE90 = 15 cm.
Limited commercial and public archives. Project
tasking likely.
- Sonar,
(Sound Navigation and Ranging): we are
developing a multi-modal bathymetric surveying and
post processing system in order to
conduct surveys down to 80 meters below sea
level.
Click here for a
definition of LE90.
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