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Questions tagged [satellite]

In the context of spaceflight, it is an object which has been placed into orbit by humans.

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Trying to find zenith and azimuth angles to satellite

I am working with satellite data. Each scene is approximately 30km squared with 1024 * 1000 pixels. I have the zenith and azimuth angle for each of the four corners, plus the center. I have latitude ...
sil's user avatar
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Reading Eumetsat METOP native file format .nat with python

I downloaded testwise a file from the Eumetsat Data Service (IASI_SND_02_M01_20240519062358Z_20240519080557Z_N_O_20240519072825Z.nat). However, the file is in their native format .nat. I gave it a try ...
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Find all connected pixels in GEE

I have two burned area maps in Google Earth Engine. I want to find and extract the pixels spatially connected to the previous year's burned area. Hereafter, I want to extract all the pixels spatially ...
Thomas's user avatar
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What does "Common frequency offset" plot means in gnss raw measurements?

I'm using Google's MATLAB code to analyze raw gnss measurement made with gnsslogger android app. In plots, there is one in particular that I don't understand the meaning, which is "Common ...
allexj's user avatar
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Issues with Clipping Shape of Sentinel-2 NDVI Image in Google Earth Engine Python API

I'm working on an agricultural analytics application where I need to generate NDVI images from Sentinel-2 data for user-defined polygon areas. The backend is implemented in Python using Flask and the ...
Maha Khan's user avatar
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How to assign a household (with its GPS latitude and coordinate) to a certain pixel of the .tif file in R-Studio

I have a one-day composite flooding data downloaded from https://www.ssec.wisc.edu/flood-map-demo/ftp-link/ftp-link-viirsrealtime/ for a specific region (called viirs_max_01_2023.tif). The pixels are ...
AJY's user avatar
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What are steps to clip Google Satellite Layer from OpenLayers plugin? [duplicate]

I have imported the Google satellite imagery through the OpenLayers plugin. I want to clip it to a polygon shapefile in Wales. Is it possible to do this and if not what are the closest alternatives? ...
Harry Batchelor's user avatar
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Calculating Cloud Opacity for a location using EUMETSAT SEVIRI raw data

I'm using EUMETSAT SEVIRI raw data (EO:EUM:DAT:MSG:HRSEVIRI) to try calculate cloud opacity. However I am struggling to find a way to calculate it using the different channels that are offered. How ...
Gideon Weiss's user avatar
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Getting positional data of LEO satellites

How can we get precise lat, long ( or xyz in ECEF ) location of LEO satellite like FORMOSAT (COSMIC-2 ) - including error matrices? POD data is available here, and tried with ‘Level 1a - Precise orbit ...
abhilash's user avatar
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New Zealand satellite imagery Google Earth Engine

I want to create a satellite image for all of New Zealand using 2020 Landsat 8 satellite imagery to then calculate NDVI to export into QGIS. I am wanting to compare to 1990 satellite imagery so want ...
Aimee Calkin's user avatar
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Error while generating chart for daily average PM2.5 concentrations in GEE

I was trying to generate a chart for daily average PM2.5 concentrations for January 2021. The satellite image I am using is Copernicus Atmosphere Monitoring Service (CAMS) Global Near-Real-Time. Here ...
Shafayath Jamil's user avatar
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94 views

Pansharpening Planet multispectral satellite imagery with UAV RGB imagery in ArcGIS Pro

I'm currently attempting to perform a Gram-Schmidt pansharpening algorithm in ArcGIS Pro using PlanetScope multispectral imagery and UAV-based RGB imagery. I am encountering an issue where the ...
Theo Diehl's user avatar
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Constructing VTEC values out of UNAVCO data

I'm going through the high-frequency UNAVCO RINEX 2.11 files to create atmospheric maps of the total electron content at a particular timestamp over a particular lat/lon range. I'm looking for ...
requiemman's user avatar
2 votes
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On the edge of the swath and the reflection of the sun

In the Sentinel-2 image data, there is an overexposure near the water surface. I have examined several images and found that it is common to the eastern edge of the swath, so I think it is a ...
aogorou's user avatar
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Band calculations using satellite images captured on different dates

I want to do some band calculations using bands taken from multi spectral (MS) satellite images and bands from a short-wave infrared (SWIR) image. I have one SWIR image covering the whole area of ...
rsf69's user avatar
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What units are AVHRR channels 1-3 in?

I'm trying to combine pre-1981 imagery from NOAA's AVHRR with post-1981 imagery from Google Earth Engine for some urban land cover prediction tasks, but have found that the channels 1-3 appear to be ...
user1880610's user avatar
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284 views

Inaccurate cloud shadow masks when using Earth Engine's script for Sentinel 2

I am currently evaluating my cloud shadow masking options for Sentinel-2 data. One of the options I am exploring is using an example script published by Google that projects cloud shadow locations ...
TheBackwardsman's user avatar
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What do the numbers on the scale mean when I zoom in and out

I am using a map that overlays carbon emissions over geographies produced by a satellite. When I zoom in and out, the number on the "scale" changes. I want to know what this number actually ...
EmZ's user avatar
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179 views

Transform TEME TLE derived positions of a GPS satellite to the WGS84 coordinate system for comparison

I am trying to compare TLE derived x,y,z positions of a GPS satellite with those derived from precise GPS ephemerides (NGA). However, I am having some trouble getting the coordinate systems and ...
woplda123's user avatar
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545 views

Downloading Sentinel-2 images: "offline products" in Copernicus Open Access Hub site

I want to download Sentinel-2 Level1C images for the specific dates. So I tried to download them from Copernicus Open Access Hub site. But I can't download since it says the product is offline, ...
Etemon's user avatar
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169 views

How to obtain coordinates of Sentinel-1 image

I’m a beginner in satellite image analysis. I want to know the lat/lon coordinates of some bursts of a sentinel-1 image. I looked at the file names of the downloaded zip, but couldn’t find any ...
Yuka Sashihara's user avatar
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35 views

Can soil moisture values be calculated from only land surface temperature?

I'm working on a project that requires me to calculate soil moisture values at specific points under future climate scenarios. I have soil moisture values for the points from historical periods and ...
Mimi Haase's user avatar
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Calculating percent canopy of 2 layers using ArcGIS Pro

I am attempting to create a table that shows the percent of canopy per census district in ArcGIS Pro. The data is in two different types. The first is a census tract shape file and the other is high ...
chrispy's user avatar
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175 views

Super resolution implementation with RS-ESRGAN

I am trying to implement super resolution to my satellite images using RS-ESRGAN (please see https://github.com/luissalgueiro/rs-esrgan/tree/master). There are three things to adjust before running ...
cemre aldoğan's user avatar
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104 views

Zonal statistics produces negative values even after changing min/max values

I am trying to extract the values of raster images (Night light satellite images, VIIRS). I have changed the min to 0 and max to 63 through the min/max settings (User defined). However when running &...
Izzy's user avatar
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40 views

QGIS Official Plugin Repository is available in MacOS

No matter which version of QGIS I download, the status of my "plugin repositories" says "unavailbe". And I can't delete this entry as it comes with the system. In addition, when I ...
yuping Ren's user avatar
2 votes
1 answer
906 views

Numpy is not setting properly nan values: arr[arr== 0] = np.nan

I am creating a script to normalize a satellite scene. My input image is of type float32, and no NoData value is assigned. However, during the normalization, I want to avoid using pixels with a value ...
Isa's user avatar
  • 193
1 vote
1 answer
175 views

Calculating 2022 NDVI time series

I calculated seasonal NDVI Time series (1 image for each season) from 2017 to 2022 using Sentinel-2 L1C images (which I converted to L2A using Sen2Cor), the first 5 years where ok, but the last 3 ...
FF123456's user avatar
2 votes
1 answer
218 views

Tasseled Cap Transformation LANDSAT Collection 2

Are there any specific coefficients available for applying the Tasseled Cap Transformation to LANDSAT 5-8 Collection 2 data?
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How to determine if GPS coordinates fall in a defined area?

TLDR; I'm looking for solutions/algorithms to determine the following: if an arbitrary coordinate (lat/lon) resides in the area of a circle resting on the surface of the Earth if an arbitrary ...
Douglas G. Wright III's user avatar
3 votes
1 answer
260 views

What is the resolution of the best publicily available satellite images from the 1970s and 1980s, for the southern hemisphere?

What motivates the question is a neighborhood disagreement involving my parents, that developed as follows: Dad bought a house in early 70s, moved there. The house was adjacent to a vacant lot, used ...
wubeinic0587's user avatar
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What is name/terminology for area in .tif satellite image file which is blank space/not land?

I have some L2 satellite images from an MSI bundle, and I need to produce a mask over the area in the file which is not the image itself - the black part in the image below. What is the technical name ...
Becky W's user avatar
1 vote
2 answers
2k views

Crop TIFF file with Python

I have a TIFF file. It is necessary to cut the TIFF file at the given coordinates (like in example below). I've been looking for a few days and haven't found a suitable solution. How can I resolve ...
Tip-Rok's user avatar
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In which software do I add a watermark to the map?

I want to know in which software I can do the following operations (esri/ pci/ hexagon et.)? Adding Watermark to the satellite image/coordinated map. Make the added watermark invisible Detect which ...
a1b2c3's user avatar
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1 vote
1 answer
252 views

GDAL - NetCDF to colorized raster

I have a NetCDF file that is satellite imagery. I would like to convert it to a raster image, with color, using gdal on the command line. Here is what I have so far: gdal_translate -unscale NETCDF:&...
Pufferfishe's user avatar
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1 answer
129 views

Can we do soil analysis for Nitrogen using remote sensing without field data for validation? [closed]

Background: Remote sensing is used for monitoring land cover change and for monitoring vegetation etc. In addition to that, it is used for soil analysis (alterations in soil properties) as well. There ...
th145's user avatar
  • 25
1 vote
1 answer
446 views

Display preview of image in semi-automatic classification plugin in QGIS does not load in layers

I have being trying to load Landsat or Sentinel-2 satellite images into the map layers panel within QGIS v26.3 with the latest version of the semi-automatic classification plugin. The screen just ...
Nicholas Gellie's user avatar
0 votes
1 answer
634 views

How to automatically extract satellite images from a list of coordinates

I have a dataframe composed of 4000 lines of geographic coordinates of various types of infrastructures. I mainly work on Python. From each of theses coordinates I would like to automatically extract ...
JEG's user avatar
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183 views

How to remove two pixels from the edge of masked raster

I have a raster file, which has empty/masked areas on the edges and then all data inside is not masked. Basically, a sub-swath of satellite data interpolated to rectangle. All is fine, except that ...
kakk11's user avatar
  • 101
2 votes
1 answer
101 views

How does a receiver locate with more than 4 satellites?

If it takes 4 equations to find x,y,z and t, how does one improve the accuracy by adding 5th equation or does it reuse any 3 previous equations and recalculate with the 5th equation?
excplorer's user avatar
1 vote
1 answer
208 views

Is there a list of formats that GDAL supports range download?

I know that the format Cloud Optmized Geotiff (COG) GDAL driver is able to range download a given image using /vsicurl/. I see that GDAL shows in its documentation. I would like to know if there is a ...
Barros's user avatar
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2 votes
0 answers
64 views

Calculate nearest point in a orbital path to user (GPS)

TLDR: how do I go about determining the nearest point in an orbital path to a user's location? Longer version: This is gonna remain a bit vague, I'm uncertain of the terminology needed to ask/answer ...
Douglas G. Wright III's user avatar
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0 answers
234 views

Linear data imputation conversion to bilinear interpolation in Python?

I have a project where the task is to impute missing data values from a modis TIF file using Bilinear interpolation. I tried to use linear interpolation to impute the missing values, but trying to ...
Bilal Jamil's user avatar
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0 answers
352 views

Sentinel 2 satellite images API

I want to download or reach Sentinel 2 images as png, jpg. I used Copernicus Open Access Hub but it is not so clear, can someone explain how to download one satellite images with ROI and time?
Wtow's user avatar
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1 answer
38 views

Convert Luojia1-01 DN values to radiance

I am trying to convert Luojia's DN values to radiance following the equation in the attached image. I am using the Raster Calculator in ArcMap for this conversion and the command I am typing is image^...
Nikos's user avatar
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1 vote
1 answer
119 views

Can I obtain NDVI mean value for specific point but multiple sites at the same time?

I'm trying to get multiple site at the same time from LANDSAT 8. The next error appears when I run it. ImageCollection (Error) Error in map(ID=20210906): Image.reduceRegions: The default WGS84 ...
SantiagoEARTH's user avatar
1 vote
0 answers
79 views

Unique product name for Sentinel-2 products, which does not change after re-processing by the distributor

Currently, I use the names of the Sentinel-2 space imagery product archives as a unique image identifier in the database. It turns out that this identifier contains processing data and time, which ...
Comrade Che's user avatar
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1 vote
1 answer
323 views

GPM monthly data is inconsistent with the half hourly data aggregated to monthly

I wrote a code in GEE to first aggregate half-hourly GPM data into cumulative daily precipitation and then aggregate daily data into cumulative monthly data. In the next step, to ensure that my code ...
Omid Zandi's user avatar
0 votes
2 answers
256 views

Downloading recent GRACE data

I have been doing GRACE data processing in GEE, but from what I can tell - only the first mission's data (dating from 2002/04 to 2017/01) is accessible through the library for import. Can I access ...
Mehdi's user avatar
  • 9
0 votes
1 answer
503 views

Seeking QGIS Tile / Basemap Options

We have been using QGIS to collect and produce maps for fiber optic deployment to areas where there is no fiber. We use OpenStreetMap as the base tile map, for streets and building structures. We ...
Frank's user avatar
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