Questions tagged [satellite]
In the context of spaceflight, it is an object which has been placed into orbit by humans.
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Comment ajouter une image satellite sur un shapefile [closed]
Bonjour, je travail sur un projet. Dans ce projet je suis concentré sur deux parcelle. J'aimerais faire en sorte d'avoir une image satellite concentré sur mes parcelle et le reste en blanc. N'ayant ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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,
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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 ...
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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 ...
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Merging Multiple 3D Point Clouds, Reducing Misalignment and Correcting Unusual Height
I've been trying to merge two point clouds into a single uniform point cloud using the Python package pyvista. However, I have encountered an issue that the misalignment between these two point clouds ...
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Landsat 8/9 level-2 pansharpening
From the USGS website states "Landsat 8 OLI Band 8 (panchromatic band) is not processed to Top-of Atmosphere or Surface Reflectance." Obviously same is true for Landsat 9. I.e., it's not ...
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What is the process for calculating the percent canopy of these 2 layers
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 ...
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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 ...
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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 &...
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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 ...
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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 ...
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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 ...
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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 ...
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Error in LAERS parameter in processing.run in qgis3.28 while writing standalone python script
I am trying to download google satellite images in ".tif" form by qgis3.28 My code is as following
import requests
from qgis.core import QgsApplication, QgsRasterLayer, QgsMapLayer
from qgis ...
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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 ...
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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 ...
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Adding Bing satellite images to maputnik
I am trying to generate an style using some tiles allocated in Mapbox and some aerial image form Bing, but cannot see how to add these satellite images to maputnik.
The aim is to create a style which ...
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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 ...
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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 ...
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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:&...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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How calc FOV for satellite
I figured out satellite orbital from tle. How I can find fov of satellite sensor in proper time? I have formula, but in output I want x,y coords on map. May be polygon of x,y.
• FOV = 2 H tan (scan ...
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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 ...
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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 ...
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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?
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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^...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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How can we know that a random satellite image is atmospherically corrected or not using python?
If a satellite image in .tiff format was given. what are the values that can be obtained from a satellite image using python to see whether it has atmospheric errors or not?
I am expecting what values ...
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Projection best practices for applying ML to large scale Earth Observation imagery [closed]
I come from a data science background, rather than GIS, but work in a domain where remote-sensed imagery is widely used; so I'm still learning some of the do's & don'ts when it comes to the 'right'...
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MODIS MCD18A2 (PAR) reproject via rasterio vs. via HDF-EOS
I downloaded MODIS L3 PAR data (https://lpdaac.usgs.gov/documents/750/MCD18_User_Guide_V61.pdf, https://e4ftl01.cr.usgs.gov//DP128/MOTA/MCD18A2.061/2014.07.04/MCD18A2.A2014185.h18v04.061.2021258072101....
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What transformation of raw sensor values from Sentinel-2 is GEE using?
What transformation of raw values obtained from Sentinel-2's sensors is Google Earth Engine using?
When accessing the data from the Sentinel Hub directly, the values that I get are a bit different ...
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Brush up satellite image coloring
I have received the following satellite image. Unfortunately, the color grading is really poor and makes working with this image very tedious (see screenshot below). I am rather new to QGIS. How can ...
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