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7 votes
Accepted

Adding weather radar data to leaflet from website

That URL is not a WMS server, its a web page. The web page has a Javascript application running that produces the map. The map contains several layers, including the base map (land/sea) and a rainfall ...
Spacedman's user avatar
  • 64.4k
7 votes
Accepted

Strange black pixels scattered on terrain flattened image

They are not strange black pixels. You set min value of S1_terrainCorrected image to -30, but the image has values lower than -30. So those lower values pixels are displayed as black. You need to set ...
Kadir ┼×ahbaz's user avatar
6 votes
Accepted

InSAR processing: why can't we just compute distances directly from time delays?

I thoroughly edited the answer to give a more complete picture. The edited answer also reflects what I discussed in the comments. ====================================================== There is not ...
Michael's user avatar
  • 1,186
4 votes
Accepted

Low Recall for Radar Image Flood Classification

Welcome to the trenches of classification, probability and statistics ;) . Assuming you used sklearn, it has a detailed user guide on what metrics it provides to evaluate your classifications: I'll ...
Senshi's user avatar
  • 1,767
3 votes

Creating radial grid using ArcGIS Pro

To my knowledge (and I could be wrong) there is no tool that does that off the shelf. But it can be very easily created in a simple model as shown below: pointtable is something like this: Here is ...
Hornbydd's user avatar
  • 43.7k
3 votes
Accepted

How to solve "Collection query aborted after accumulating over 5000 elements"?

The collection you pass to ui.Chart.feature.byFeature() cannot contain more than 5000 features. In your case, your sample collection contains way more than 5000. pairedImage.sampleRegions(geometry, ...
Daniel Wiell's user avatar
  • 14.2k
3 votes

Colorize radar imagery so it looks like optical imagery

You can't give a Radar image the same properties as an optical image. The wavelength used for producing the different images doesn't give you the same information at all. You "see" a similar image ...
TurboGraphxBeige's user avatar
3 votes
Accepted

WhiteboxTools returns nan rasters when lee filtering large radarsat images

I was able to narrow down the cause of the issue that you encountered with the set origin point of the grid. It seems that your GeoTIFF was of a format where the coordinate system was provided by ...
WhiteboxDev's user avatar
3 votes
Accepted

Sun-synchronus orbit for SAR satellite

While I don't actually design / choose orbits for SAR satellites, my understanding is as follows. Fundamentally, it is a question of meeting a set of mission parameters. Parameters such as global ...
Mikkel Lydholm Rasmussen's user avatar
2 votes

Why side looking?

Here are few reasons why: Because in nadir looking radar, there's left-right ambiguity, i.e, radar system cannot differentiate equidistance left and right object. There is very strong power reflected ...
hillsonghimire's user avatar
2 votes

Why side looking?

You can find a good explaination on the web site of the Center for Space Research (University of Texas at Austin): http://www.csr.utexas.edu/projects/rs/whatissar/rar.html "A radar can only ...
Saleika's user avatar
  • 1,330
2 votes

Why side looking?

Radar has to view obliquely so that the time delay of the echo is proportional to the distance across the swath. That's the only reason.
Iain Woodhouse's user avatar
2 votes

Terrain correction / Orthorectification with gdal

Here is the command I use to do it all at once, plus some other helpful settings to help it run a bit quicker. If needed, you can also specify coordinates to chip the image using the -te flag. This ...
MikeF22's user avatar
  • 21
2 votes
Accepted

How to calculate an incidence angle raster for a radarsat 2 scene using gdal / python?

If you are working in range-Doppler (not projected), you can exploit the information contained in the calibration gains. RS-2 products are generated using an "Application LUT", which aims to correct ...
Benjamin's user avatar
  • 911
2 votes
Accepted

Error in orthorectification of Radarsat-2 scenes with GDAL and RPC + DEM information

With RS2 you need to point GDAL to either the parent directory or the product.xml file. From your code, you are pointing to the *.tiff file directly. So your modified code should be: gdalwarp -...
not_a_NaN's user avatar
2 votes
Accepted

How to extract coherence and covariance matrices of TerraSAR-X data?

Because the data are "detected", you have real amplitude values only, not complex values which also include the polarimetric phase. Without the phase information, you cannot form the covariance or ...
Benjamin's user avatar
  • 911
2 votes

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

I think you have the gist of it. From Iain H. Woodhouse's text "Introduction to Microwave Remote Sensing" (a great resource on SAR and RADAR): For convenience, in remote sensing the horizontal axis,...
Charlie Parr's user avatar
  • 1,956
2 votes
Accepted

Removing pixels of a GeoTIFF based on a scalebar

I agree with @user2856 that you're unable to directly filter the pixels based on the values in your scale bar, however, if you are ok with a (hacky) workaround, here is a potential solution using R ...
Kartograaf's user avatar
  • 2,917
1 vote

Practical difference between intensity and amplitude in SLC SAR Sentinel 1 data

You can think of amplitude as measuring a voltage (in units of Volts), which is proportional to energy, while intensity represents a power (in units of Watts). The images will look similar, but some ...
DetectionAndRanging's user avatar
1 vote

Understand radar scan data

I have just started looking at radar data but in a different format and implementation from yours. I have .png files but the data is only in one plane. The .png files behave like any other image file, ...
Roo's user avatar
  • 143
1 vote

Complex SAR values in Interferogram

It's not completely different, but not entirely correct: Say you have two SLC's, each with an amplitude and a phase. When you cross-multiply SLC1 and SLC2*, the amplitude of the resulting ...
DetectionAndRanging's user avatar
1 vote

What does "Ensemble average for a given window of pixels" mean?

It's spatial averaging (i.e. multi-looking) from scattering matrix to covariance/coherence matrix. See this paper for better understanding. Composite Kernel Method for PolSAR Image Classification ...
Mustafa Ustuner's user avatar
1 vote

How to make customized radar chart in R?

If your tag is meant for ggplot2 answers. # data preparation df = data.frame(Group = LETTERS[1:9], Yellow = c(-0.61,0.13,0.24,-0.30,-0.12,-1.24,0.74,0.55,0.80), Blue = ...
Kazuhito's user avatar
  • 30.9k
1 vote

Sun-synchronus orbit for SAR satellite

Also, a SAR instrument needs a lot of electricity since it is an active sensor and therefore a sun-synchronous orbit keeps the instrument's solar panels well illuminated, therefore allow plenty of ...
Conor's user avatar
  • 11
1 vote

Lowrance sl2 format... is it GIS data and/or can it be made into GIS data

Likely an answer waaay to late to help the OP but in case anyone else stumbles across this in search of an SL2 reader there's now a standalone app : https://gitlab.com/hrbrmstr/sl2json (requires ...
hrbrmstr's user avatar
  • 1,224
1 vote

Lowrance sl2 format... is it GIS data and/or can it be made into GIS data

Reefmaster software allows you to import several .SL2 Files, and merge them. You can then export to kml and other GIS compatible formats.
DerekWilliamsFishing's user avatar
1 vote

Source of radar imagery for coastal areas

The ESA/EU make radar products from the Sentinel satellites available for free through the Copernicus Data Portal.
kes's user avatar
  • 996
1 vote

Why are there holes in these radar blobs?

When the sun goes down and the surface begins to cool, the change in refractive index in the lowest few (to several) hundred feet of the atmosphere tend to bend the radar beam toward the surface. This ...
Maxima's user avatar
  • 1,701
1 vote

Calibration error for Sentinel 1 image in SNAP toolbox

As mentioned the error is due to RAM but not the system RAM, the available RAM for SNAP. you can change the configuration in the snappy.ini file located in the snappy folder. and increase available ...
moeen zohary's user avatar
1 vote

Is there a way to use the GDAL C++ API to find areas of overlap between two SAR images?

If all you need is a numerical representation of the position of the images (not, say, a raster mask), you can use the origin and resolution found in the geotransform information with the raster size ...
Benjamin's user avatar
  • 911

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