Questions tagged [synthetic-aperture-radar]
The synthetic-aperture-radar tag has no usage guidance.
20
questions
0
votes
1answer
24 views
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 ...
0
votes
1answer
32 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 ...
1
vote
0answers
58 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 ...
0
votes
1answer
41 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 ...
1
vote
1answer
344 views
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:
...
3
votes
2answers
893 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: ...
1
vote
0answers
137 views
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 ...
1
vote
2answers
601 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 ...
2
votes
0answers
24 views
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 ...
1
vote
0answers
564 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?
0
votes
1answer
36 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 ...
5
votes
2answers
5k views
Export each image from a 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 ...
1
vote
1answer
141 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?
2
votes
0answers
150 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 ...
1
vote
0answers
607 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-...
0
votes
1answer
542 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,...
-1
votes
2answers
47 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?
1
vote
1answer
410 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....
1
vote
3answers
126 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 ...
0
votes
1answer
565 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 ...
