26 questions
0
votes
0
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42
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Exraction of single band from tiff file which was exported from SNAP
I am a beginner in Google Earth Engine (GEE) and currently working with Sentinel-1 satellite data. I have used SNAP software to perform various preprocessing steps on the data, including multilooking (...
- 1
0
votes
0
answers
66
views
Checkerboard Mosaic When Merging Prediction Tiles from TensorFlow UNet
I’m running a TensorFlow UNet model on geospatial imagery. I split the image into overlapping 500×500 pixel tiles using a custom function (get_tiles) and use a stride of 460 (i.e. 500 – 2×padding) so ...
- 1
1
vote
0
answers
192
views
Radar Vegation Index scaling issues [0, 1] for Sentinel-1 data
I am trying to understand some data issues I am having with using Sentinel-1 VV and VH data to create RVI statistics.
I am familiar with the fact that you need true quad polarisation to calculate the ...
- 351
1
vote
0
answers
43
views
Error ruinning CMOD5.N function with python
i’m having trouble running the function cmod5n_inverse, i’ve inserted the parameters phi(wind direction-azimuth angle), and the incidence angle and sigma0 extracted from SNAP from a Sentinel-1 image, ...
- 11
1
vote
0
answers
221
views
Extract data for different points from Sentinel-1 at once using earth engine
I am trying to extract sentinel-1 time series data for different locations from earth engine. The locations in this case are not present in single sentinel-1 image, but are distributed in several ...
- 299
0
votes
1
answer
449
views
i am fetching a data from sentienl1 rtc using python in jupyter notebook
The code in jupyter environment
so I am able to run it in jupyter notebook in local env. and its taking ages to do but still showing in progress, when i try to do the same in colab or sage-maker its ...
- 1
1
vote
1
answer
397
views
Problems with R raster package handling of coordinates, resolution and extent of a raster read from a "tiff" file from Sentinel-1
I am trying to create a automating process in R to analyse a large number of tiff files from Sentinel-1. I read the raster in R using
r <-raster("s1a-iw-grd-vh-20230208t052407-20230208t052432-...
- 527
1
vote
0
answers
237
views
How I do pre-processing of sentinel1 data using python?
I have started learning SAR image processing. My project goal is to determine various type of trees using SAR images. For this, C-band data and L-band data are good for analysis.
How can I open or ...
- 11
1
vote
0
answers
63
views
Import SENTINEL-1 phase data to AWS
How to import SENTINEL-1 Amplitude and Phase data to AWS S3 ?
- 31
1
vote
1
answer
893
views
How to filter a Google Earth Engine Image Collection by crs?
I have a script to download Sentinel-1 images from Google Earth Engine, which works perfectly over UK regions and other parts of Europe. However, when I try to run it for a region of Norway, the ...
- 11
-1
votes
2
answers
1k
views
Plot 2 dimensional numpy array in .npy file using matplotlib?
I have numpy file stored as "test.npy" which is a 2 dimensional Synthetic Aperture Radar(SAR) image data with VV and VH polarization bands. How do I plot this 2 dimensional image array using ...
- 593
1
vote
1
answer
821
views
google earth engine- Sentienel 1 Download Image Colllection
I am trying to download availables scenes of sentinel 1-GRD into a date range. I have done this for a composite image and It has been worked properly but It is doesn´t work for an images collection.
...
-1
votes
3
answers
131
views
Variable/optional arguments in a function within a function
I am working on a script that let's me connect to the Sentinel satellite database to download the requested map files.
from sentinelsat import SentinelAPI, read_geojson, geojson_to_wkt
def ...
- 3
1
vote
0
answers
152
views
How can I create a graph with time variation of all the polygons in a Shapefile in GEE?
I have a problem. I would like to get a time series graph with the mean of each of the polygons in my shapefile (data_shp) using GEE. But I can only get a single mean for all the polygons.
I tried ...
- 37
1
vote
0
answers
315
views
Sentinel 1 data gaps in swath overlap (not sequential scenes) in Google Earth Engine
I am working on a project using the Sentinel 1 GRD product in Google Earth Engine and I have found a couple examples of missing data, apparently in swath overlaps in the descending orbit. This is not ...
- 71
2
votes
1
answer
1k
views
Python API sentinelsat HTTP status 500 Internal Server Error:
shows the error:
"HTTP status 500 Internal Server Error: Trying to download an offline product"
The code i am using is
import time
import datetime
from sentinelsat import SentinelAPI, ...
1
vote
0
answers
132
views
how to retrieve Common data for Sentinel-1, Sentinel-2 and Landsat-8 on same study area
I am an amateur to GEE, Can anyone help me the script to retrieve Common data for Sentinel-1, Sentinel-2, or Landsat-8 on the same study area?
I require all the three sensor's data for same-day in the ...
1
vote
2
answers
185
views
How can i add the auxil.py module?
I am trying to perform image classification using Sentinel 1.
I am new to coding so I am using this: http://mortcanty.github.io/src/s1class.html
I got an error saying: auxil is not a module so I ...
- 13
2
votes
0
answers
148
views
don' work prepSentinel with sentinel 1 data
I 'm new to using R...i'm trying to pre-process sentinel 1 data; I am using a packages getSpatialData (https://rdrr.io/github/16EAGLE/getSpatialData/man/getSpatialData-package.html). I downloaded the ...
- 21
0
votes
0
answers
185
views
Create a mosaic from minimum number of Sentine-1 SAR images that has a maximum coverage of a polygon shapefile
I have a polygon shapefile that defines a very large ROI. In order to cover this ROI, I need to create a mosaic of rasters (Sentinel-1 images). The mosaic needs to be made with minimum number of ...
- 708
1
vote
0
answers
82
views
How to extract reflectance values from a SAR-Optical stack in R
I have stacked sentinel-1 and sentinel-2 images in QGIS. I did preprocessing in SNAP and used the "align rasters" tool in QGIS to resample the images to 20m and to register them to a common projection....
- 11
2
votes
1
answer
854
views
Displaying an image with matplotlib having resolution greater than screen resolution
I am trying to display a sentinel-1 satellite image which is of size 26000(width) X 17000(height) pixels and using Python 3.5. I am able to load this image in numpy as an array and trying to display ...
- 388
1
vote
1
answer
918
views
Filtering Sentinel 1 Image Collection to my area of interest produced no feature (or image) in google-earth-engine
My objective it to load and filter 2015 to 2016 sentinel images for my project area (AOI); The code produced image collection without image. Can you help me
The following is the code originally from ...
- 13
2
votes
1
answer
2k
views
Python API sentinelsat error in download
I am having a go at using the sentinelsat python API to download satellite imagery. However, I am receiving error messages when I try to convert to a pandas dataframe. This code works and downloads my ...
- 23
1
vote
1
answer
4k
views
Converting geographical coordinates (long, lat) to pixel position (x,y) for a Sentinel-1 SAR image
How can i get the (x, y) pixel position from the geographical coordinates in a Sentinel-1 Synthetic Aperture Radar (SAR) satellite image?
I can access a downloaded image info sg as
from snappy ...
- 8,547
1
vote
1
answer
3k
views
Converting pixel position to geographical coordinates (lat, long) for a Sentinel-1 SAR image
How can i get the geographical coordinates from x,y position in a Sentinel-1 Synthetic Aperture Radar (SAR) satellite image?
For example, I can access a downloaded image info sg as
from snappy ...
- 8,547