What is the spatial resolution of SAR?

What is the spatial resolution of SAR?

With a bandwidth of 500 MHz, the slant range resolution is 0.3 m and the ground-range resolution is 0.55 m for the same look angle.

What are the components of a complex SAR image?

SAR image data are a 2D array of complex numbers with indices representing, for example, changing range and changing azimuth coordinates. Like signal data, each sample includes quantized amplitude and phase (or alternatively, in-phase and quadrature) components.

What is SAR imagery?

Synthetic-aperture radar (SAR) is a form of radar that is used to create two-dimensional images or three-dimensional reconstructions of objects, such as landscapes. SAR uses the motion of the radar antenna over a target region to provide finer spatial resolution than conventional stationary beam-scanning radars.

What is NESZ?

Noise-Equivalent Sigma Zero (NESZ) is a measure of the sensitivity of the system to areas of low radar backscatter. It is given by the value of the backscatter coefficient corresponding to a signal-to-noise ratio of unity, .

What are the four types of resolution?

There are four types of resolution to consider for any dataset—radiometric, spatial, spectral, and temporal.

Is SAR active or passive?

SAR is a type of active data collection where a sensor produces its own energy and then records the amount of that energy reflected back after interacting with the Earth.

What is complex SAR data?

SAR data can be delivered as Single Look Complex (SLC) data where the intensity and phase components are represented as complex numbers for each pixel. Intensity and phase values can be subsequently computed from the complex numbers.

What is coherence SAR?

Coherence refers to the amplitude of the complex cor- relation coefficient between two SAR images.

What is SAR polarization?

Polarization refers to the orientation of the plane in which the transmitted electromagnetic wave oscillates. While the orientation can occur at any angle, SAR sensors typically transmit linearly polarized. The horizontal polarization is indicated by the letter H, and the vertical polarization is indicated by V.

How is image resolution measured?

Digital images are usually measured by counting the number of individual pixels (dots of image data) in an inch. Thus he resolution of digital images is often given in “Dots per Inch”(DPI) or, more precisely, “Pixels per Inch” (PPI).

What is SAR (remote sensing imaging)?

Imaging, remote-sensing radarssuch as SAR, , produce high- resolution (from sub meter to few tens of meters) images of surfaces. The a geophysical information can be derived from these high-resolution images by using proper post-processing techniques.

Why do SAR images look different from optical images?

The time delay/Doppler history basis of SAR image generation leads to an image projection different than in the case of optical sensors. Even though at first look radar images seem very similar to optical images, close examination SAR Imaging Basics 21

What does SAR stand for?

Chapter 1 Synthetic Aperture Radars (SAR) Imaging Basics 1 Chapter 1 Synthetic Aperture Radars (SAR) Imaging Basics

How is the smoothing done in imaging SAR?

In most imaging SARs, the smoothing is done by averaging the brightness of neighboring pixels in azimuth, or range, or both.The number of statistically independent pixels averaged is called the number of looks N. We can show that the signal standard deviation S