Radar data available over the study area include a JPL-Airsar 'opportunity' acquisition with C-band single-pass interferometry, and L- and P-band polarimetry (March 2004) and X-band airborne SAR data acquired by Intermap Technologies using a STAR3i (April 1999). This first commercial SAR data for Belize includes a first return Digital Surface Model (DSM) from the "near-top" of the vegetation canopy (5m grid, ~3m RMSE vertical) and an orthorectified image (ORI) of backscatter intensity (2.5m). Several archived Landsat images and an earlier Airsar mission from 1994 are also available.
The Star-3i system consists of an Interferometric Synthetic Aperture Radar (INSAR) mounted on a Learjet 36 aircraft. The system is made up of 2 X-band radar antennas which are separated by a baseline of 1m. The aircraft is typically flown at 8000-9000m (~20,000-30,000ft) and acquires a 10km swath of 1.25m resolution data at a rate of up to 100Km2 / minute. The depression angle is between 35°-55°, centred on 45°. It should be noted here that the Intermap data used for the current studeies consists of data collected before the recent system upgrade, and so has an ORRI resolution of 2.5m and a DSM accuracy of ~3m.
The commercial products used in TREEBEARD include an Orthorectified Radar Image (ORRI) and a first return Digital Surface Model (DSM).
We are grateful to Intermap Technologies for supplying the Star-3i data for the RBCMA, for further details of Star-3i and related activities, please see www.intermap.com.
|Intermap Star-3i learjet.||Full extent of Intermap X-band data set (ORRI).|
AIRSAR is a side-looking radar instrument and can collect fully polarimetric data (POLSAR) at three radar wavelengths: C-band (0.057 m), L-band (0.25 m), and P-band (0.68 m). AIRSAR can also collect two types of interferometric data: cross-track interferometric data (TOPSAR), which are sensitive to topography and along-track interferometric (ATI) data, which can be used to measure ocean surface currents.
Specific data used in TREEBEARD are L- and P-band polarimetric data sets.
We are grateful to JPL for aquiring the AirSAR data for the RBCMA, for further details of AirSAR and related activities, please see http://airsar.jpl.nasa.gov/.
|JPL AirSAR.||AirSAR colour composite.|
A wide range of supporting data sets include field data, optical imagery and GIS applications.
A full inventory of data sets will appear here shortly...