Questions tagged [synthetic-aperture-radar]

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The nature of SAR pixel value VS. of panchromatic pixel value

When we compare sentinel-1 SAR orthorectified 8-bit image vs a very high resolution panchromatic 8-bit image, the panchromatic cells are a resemblance of signal amplitude in an 8-bit scale (0-255). ...
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Writing data in TerraSAR-X COSAR Format

I am looking for a way to make SNAP read TS-X data that I have modified in some ways. I have written Python code to read a TS-X stripmap product (from a *.cos file) and to perform some modifications ...
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142 views

Calibration annotation data for Sentinel-1 images downloaded from Sentinel Hub?

I received some Sentinel-1 tiff images that were downloaded via the WCS service, so they're just the tiff files, not the full SAFE-format products. They're for the IW GRD product, and my ...
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5 votes
1 answer
647 views

What do horizontal (H) and vertical (V) polarization mean for satellite radar?

I'm reading about synthetic aperture radar (SAR), and one of the basic concepts is that the transmitted and received signals can have "horizontal" (H) or "vertical" (V) polarization, but I can't find ...
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What does "Ensemble average for a given window of pixels" mean?

Can someone please let me know what does "ensemble average for a given window of pixels" mean when calculating a coherency or covariance matrix? I have taken this sentence from a paper "Polarimetric ...
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1 answer
317 views

Multidimensional File to allow for pixel values across time series

I have a composite of SAR (28 images in a time series) data and I am trying to get the values of each pixel for the whole time series. I am looking at the coefficient of variation and trying to ...
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148 views

Conversion to normalized radar cross section of PALSAR data in Google Earth Engine [closed]

I am mapping deforestation driven by palm oil expansion in Malaysia. I am using ALOS PALSAR data from JAXA available directly on Google Earth Engine. Those data are raw and I'd like to process them ...
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148 views

Colorize radar imagery so it looks like optical imagery

Here is an imagery from a radar satellite Is it possible to colorize a radar image, so it looks like and enables the same kinds of analysis as for an image captured from an optical satellite (simple ...
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1 answer
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Why pixel spacing measures as spatial resolution in Sentinel-1 SAR images

I have been processing Sentinel-1 SAR images-both medium and high resolution. Looking into the documentation, the pixel spacing and resolution have been specified as: High resolution level-1 GRD: ...
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4 votes
3 answers
4k views

Determining if Sentinel-1 orbit is ascending or descending from absolute orbit number?

The file name convention for the Sentinel-1 mission is MMM_BB_TTTR_LFPP_YYYYMMDDTHHMMSS_YYYYMMDDTHHMMSS_OOOOOO_DDDDDD_CCCC, where MMM: mission identifier (S1A, S1B) BB: mode/beam (IE/EW/WV) TTT: ...
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Spatial prediction in GIS [closed]

I have a number of images, (these could be vectorised) that are label classifications. There are only 2 classes, 1 or 255. Each image is from a different date. For each date I also have data that can ...
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3 answers
1k views

Sentinel-1 missing data gap in adjacent acquisitions

Some months ago I posted Export each image from a collection in Google Earth Engine about exporting Sentinel 1 scenes from a collection and was successful with help from Rodrigo Principe. I now have ...
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2 votes
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Register an image using mutual information

I want a procedure for registering two images based on their mutual information. I took a pair of georeferenced radar images of the same location, edited the metadata of one so its position was off by ...
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1 vote
0 answers
1k views

SAR processing in R? [closed]

Anyone know if a package for processing SAR data in R exists? Such as doing calibration, terrain correction, classification on e.g. Sentinel 1 data?
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1 answer
57 views

interferometry vertical wavenumber

I want to process a stack of Sentinel 1 SLC images (4) to produce tomographic layers for above ground biomass estimation. To do that, I need to generate the interferometric vertical wave number images ...
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9 votes
2 answers
26k views

Exporting each image from collection in Google Earth Engine

I am trying to export each image in a filtered stack of Sentinel-1 images and cannot seem to get it right. Think link suggests using imageCollection.map() and a custom function (such as a geometric ...
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1 vote
1 answer
160 views

Generating covariance matrix from ENVI binary file of SAR polarimetric image?

I have ENVI binary files of SAR polarimetric image. How can the covariance matrix [c2] be generated from the image?
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2 votes
0 answers
190 views

Meaning of Spatial resolution (m) = 2 rng?

I'm reading a catalog about SAR sensors. On page 17, it is said that: I've read the PolSAR data format for UAVSAR before, But not the other documentations related to InSAR, because I didn't ...
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1 vote
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1k views

Getting local incidence angle map from SAR-Imagery?

I have a dual pol TanDEM-X imagery with a bi-static acquisition mode. To calculate the vertical wavenumber, I need a local incidence angle map of the Master and Slave image. As a first step I co-...
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1 vote
1 answer
621 views

Sentinel-1: biomass for agriculture

How do can I calculate biomass for some agriculture by using VV and VH polarisation SAR images? I know there are some correlation for HV RADARSAT-2 to get biomass for some agriculture like corn, wheat,...
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2 answers
52 views

Source of radar imagery for coastal areas [closed]

For my final year research project I need radar images of coastal areas. And can anyone help me to find links where I can download such data free for research purposes?
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1 vote
1 answer
778 views

Pauli Decomposition

I would like to apply a Pauli Decomposition to my Dual-Pol SAR Data (HH; VV). As a result, I need the complex values from Pauli Basis HH+VV and HH-VV and I will not use it for a RGB picture generation....
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1 vote
3 answers
222 views

Learning resources for SAR images?

I would like to learn more on processing SAR images (general characteristics, pre-processing, filtering), in particular Sentinel-1, for crop monitoring (paddy rice in particular) in areas where ...
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1 answer
673 views

Get look angle at a specific coordinate on a SAR image

Can we get the look angle of the SAR sensor on a large image for a given coordinate, if we only have the look angle in the mid-swath (or the near-range & far-range angles)? Do we get the look ...
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