Edition: Version 1.5 DTM, DSM
Creation date: 2005-01-01
Publication date: 2005-01-01
Abstract: IFSAR technology maps large areas more quickly and more efficiently than any other technology in the world. A fixed-wing aircraft, equipped with IFSAR, can operate day or night, in clear or cloudy conditions— virtually anywhere, anytime.
IFSAR is advanced, flexible, and capable of handling a high volume of data. This means it is less expensive than competing technologies, while still providing you with highly-accurate (+\- 1 Meter) digital elevation products that can enable a wide range of innovative applications.
Intermap’s IFSAR systems use two antennas separated by an interferometric baseline to image the earth’s surface by transmitting radar pulses toward the terrain. The reflected energy, represented by the lines from the two antennas to the terrain below,is recorded by both antennas, simultaneously providing the system with two SAR images containing amplitude and phase of the same point on the ground, separated only by the phase difference created by the space between the two antennas. In addition, as the aircraft passes over the terrain, global positioning system (GPS)
data from both aircraft- and ground-based GPS devices and navigation data from an Inertial Measurement Unit (IMU) onboard the aircraft are collected.
The phase difference between the antennas for each image point — along with range, baseline, GPS, and navigation data — is used to infer the precise topographic height of the terrain being imaged. This enables us to create an interferogram (depicting the phase difference) from which we derive our DSMs and ORIs. Through additional processing, we generate our DTM and CORI products.
Purpose: GIS and geospatial professionals working for government agencies and commercial enterprises throughout the world realize the importance of an accurate basemap. The basemap is literally the foundation upon which the success and failure of any geospatial project ultimately rests.
From transportation corridors and water supply systems to land-use management and structural engineering, an accurate foundation layer comprised of the most reliable height information available can literally mean the difference between life and death.
Precise 3D elevation datasets and geometric images can provide a foundation layer of unrivaled accuracy for any geospatial project imaginable, including but not limited to:
* planning for highway improvements and construction
* providing reliable site-location information for a proposed grade school
* assessing the potential risk of environmental hazards such as earthquakes, flooding, mudslides, and wildfires
* determining the safest route for a municipal water supply or treatment system
We offer four different geospatial datasets: orthorectified radar images, elevation shaded images, digital surface models, and digital terrain models.
Service type: Standalone application
Topic category: Imagery base maps earth cover, Intelligence military, Inland waters, Location, Transportation, Farming, Utilities communication, Boundaries, Climatology meteorology atmosphere, Elevation, Environment, Geoscientific information
Use constraints: License
Extent: United States of America
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