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Multifrequency observations
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Oettl, H. Heel, F. Kietzmann, H. Schmullius, C. Glitz, R. |
| Copyright Year | 1993 |
| Description | Analyses of synthetic aperture radar (SAR) image data were performed at DLR to classify various kinds of vegetation and different terrain types. The data were collected both with the DLR experimental synthetic aperture radar (E-SAR) in X-band, C-band, and L-band and with the NASA/JPL DC-8 SAR in C-band, L-band, and P-band. E-SAR is a single frequency and single polarization system (both parameters can be selected) but several flights were used to collect multifrequency/multipolarization data which were geometrically matched after processing. Classification of different crop types was based on comparison of the backscatter coefficients of calibrated SAR data in different frequency bands and polarizations. The DC-8 STAR collects polarimetric data in different bands simultaneously. Data acquired with the NASA/JPL DC-8 STAR are qualified for scientific investigations by reducing the cross-talk and channel imbalance to a tolerable extent. The data are absolutely calibrated by using reference targets with known backscattering cross-sections. The signatures and polarimetric features of terrain types, such as grassland, concrete, sea, forest (coniferous; deciduous) and urban areas, are extracted and discussed with respect to frequency and incidence angle dependence. A multifrequency polarimetric feature vector was applied for classification. The results of this new approach for separating and classifying different object classes are presented. |
| File Size | 1369490 |
| Page Count | 16 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19940011429 |
| Archival Resource Key | ark:/13960/t8bg7m495 |
| Language | English |
| Publisher Date | 1993-05-28 |
| Access Restriction | Open |
| Subject Keyword | Earth Resources And Remote Sensing Classifications Ultrahigh Frequencies Terrain Backscattering Scattering Cross Sections Crosstalk Scattering Coefficients Vegetation Superhigh Frequencies Farm Crops Radar Imagery Synthetic Aperture Radar Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
