Questions tagged [sar]
The sar tag has no usage guidance.
12
questions
1
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1answer
110 views
SAR processing using Python
I would like to batch process Sentinel-1 images in Python.
Previously I have used SNAP (Sentinel-1 Toolbox) to apply Calibration, Multilooks, Speckle Filters, Terrain Correction and then export as a ...
0
votes
0answers
23 views
Projecting SAR GeoTIFF in azimuth & slant range coordinates
I'm newish to SAR imagery. We have SAR imagery generated from an airborne SAR platform that we are sharing with partners. We have been feeding them geotiffs of the imagery in WGS84 and EPSG:3857 for ...
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0answers
36 views
SAR processing - geocoding shapefile which is slant range
Is there any software (like snap, sarscape etc.) can be used to geocode shapefile (slant range) to shapefile (ground range) (like WGS84)?
If yes, which data is need for that?
By the way, the ...
0
votes
1answer
52 views
GDAL: Using gdallocationinfo on a rotated SAR image to get pixel value at Coordinates
Some information: I must not re-sample the image, the pixels are rotated, and the image opens in Arcmap just fine.
now, there are 15 GCPs on the raster (which make the pixels rotate)
Progress:
1.When ...
1
vote
1answer
359 views
How to mosaic multiple Sentinel-1 images in SNAP software?
I am trying to mosaic multiple sentinel sar images in esa snap software. The scenes are acquired from two adjacent tracks. I used the tool S1 slice wizard in snap under radar tool menu. But my images ...
3
votes
0answers
714 views
How to visualize inundation using Sentinel 1 SAR Data?
I am trying to visualize flooding after hurricane Harvey that made landfall on August 25-26 2017.
Based on this video, I've been able to obtain the basics of Sentinel-1 SAR imagery. Sentinel 1 comes ...
6
votes
1answer
171 views
InSAR processing: why can't we just compute distances directly from time delays?
My question can be very basic, but even after studying quite a few tutorials on InSAR processing, I still do not understand one thing: if we know a wavelength, speed of light, a time delay it takes ...
2
votes
1answer
63 views
How to calculate an incidence angle raster for a radarsat 2 scene using gdal / python?
I want to make a raster band that gives the incidence angle for each pixel in a radarsat-2 scene. I know this is possible using the information given in the product.xml file (below), but I'm not ...
2
votes
1answer
143 views
Error in orthorectification of Radarsat-2 scenes with GDAL and RPC + DEM information
I am trying to use a DEM rational polynomial coefficient (RPC) information to orthorectify radarsat-2 images with GDAL 2.2.1. I have successfully done this with Orbview-3 images using the tutorial ...
2
votes
0answers
99 views
Understanding difference between collocation and coregistration?
I'm a little confused on this topic. I need to put 2 SAR images into same coordinate grid.
In ESA SNAP tool, there are 2 options:
coregistration: Radar->Coregistration->Coregistration
collocation: ...
1
vote
1answer
58 views
SAR spectral signatures for oil spill detection from different sensors
I have a rather general question about supervised classification for oil spill detection. I want to apply supervised classification on the ESA SNAP dark spot detection tool results. My question is: if ...
0
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2answers
125 views
Sun-synchronus orbit for SAR satellite
I have been following the news about the launch of the PAZ satellite (a SAR imaging sensor). The orbit will be sun-synchronous. I know this is important for optical sensors to make sure they have the ...
