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Questions tagged [remote-sensing]

Collecting and interpreting information about the environment and the surface of the earth from a distance, primarily by sensing radiation that is naturally emitted or reflected by the earth's surface or from the atmosphere, or by sensing signals transmitted from a device and reflected back to it.

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Strange stripes on Google Maps in the region of the October Revolution Island

On 2024-04-16 one can see strange stripes located roughly at 79.86317, 94.64563 in the region of the October Revolution Island. What could be the source of these stripes in an end product? I mean, ...
swiss_knight's user avatar
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Why if I spoof the position with GNSS Analysis MATLAB Google code,I get a spike of horizontal speed but it continue to be active while should be const

I'm using this GNSS Analysis Matlab Google code to analyze the measurements performed via GNSSLogger app. I was initially in Palermo,Sicily and tried to spoof to Rome. I get this Horizontal speed ...
allexj's user avatar
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QGIS plotting from a multiband raster in a ternary diagram

I am working on creating a (remote) superficial geological map using ASTER imagery in QGIS. I have made several RGB composites including Abram's ratio and Thermal Infra red indices to aid in ...
Anon's user avatar
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1 answer
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Random Forest error

I have tried a LULC classification using random forest algorithm in Google Earth Engine but error showing: Layer error: Property 'B2' of feature '0' is missing. My script code: https://code....
Debasish Samanta's user avatar
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11 views

Coregistration for training and validation

If I want to use a 30-m raster as an independent validation dataset for a remote sensing analysis of 10-m and 20-m satellite imagery bands, do I need to coregister the 30-m raster with the 10-m and 20-...
user240875's user avatar
1 vote
1 answer
38 views

Direct use of Sentinel 2 L2A imagery for vegetation analysis

I am working on my research to calculate the green vegetation in the study area using sentinel 2 L2A 10m resolution. Do I need to perform any correction or smoothing before analysis?
Monika Jirel's user avatar
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15 views

Why are my calculated normalized difference indices maxima bigger +1?

I’m wondering about the results of my indices, e.g. the NBR maximum is +1.37 (see picture below),and as we all know the NBR (like any other normalized difference index) should be between -1 and 1… ...
Gegnerle's user avatar
1 vote
1 answer
296 views

Understanding Landsat 8-9 Pixel Quality Assessment (QA_PIXEL) Value Interpretations

Table 6.3 here describes the Landsat 8-9 Pixel Quality Assessment (QA_PIXEL) Value Interpretations. Value 54596 contains both "clear" and "cirrus". What am I to make of it? A pixel ...
user88484's user avatar
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Is there a publicly available higher resolution equivalent to Landsat 8/9 TIRS?

I have a strong feeling the answer to this question is no. That said, I'd love to be wrong. I'm looking to estimate land surface temperature at a higher resolution than the 100m bands (10 and 11) on ...
msmith81886's user avatar
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Excluding 'No Data' Pixels When Counting number of pixels in an AOI with ERDAS IMAGINE

I'm working with Landsat imagery in ERDAS IMAGINE 2014 and have encountered an issue with 'no data' pixels within my Area of Interest (AOI). The AOI includes unwanted 'no data' pixels that are ...
DMAGAS SENAVIRATHNA's user avatar
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DIY Multispectral camera Rededge

I am trying to build my own multispectral camera using a Raspberry Pi, RGB camera, and Near IR Camera. My original goal was to measure the NDVI index. However I am now interested in the NDCI index as ...
mdansfo's user avatar
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Implementing NDAVI in Google Earth Engine

I am attempting to use the NDAVI index to segment emergent aquatic vegetation from open water. I read in a paper that this could be done. var point = ee.Geometry.Point([-122.292, 37.9018]); // Import ...
mdansfo's user avatar
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What do the values mean in surface reflectance/surface temperature bands Landsat 8/9 OLI/TIRS C2 Level 2?

I am trying to make a heat risk index using Landsat8 but I am having a bit of trouble with understanding the basics or operating remotely sensed imagery. I downloaded the band 10 of Landsat 8 because ...
noobshacks76's user avatar
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29 views

Landsat 8 - eleven bands and corresponding files

Landsat 8 zipped file downloaded via EarthExplorer consists of several files. Which of the files correspond to the band 8, 9, 11? LC09_L2SP_x_y_z_02_T1_ANG.txt LC09_L2SP_x_y_z_02_T1_MTL.json ...
Vladimir Z.'s user avatar
2 votes
2 answers
40 views

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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88 views

Efficient way to handle large Sentinel - 2 imagery dataset

I need to automatically crop large number of polygons (~200K in a geojson file) from Sentinel-2 images varies both in extent (~30 tiles) and time (from May till August, say it's about 30 images) so if ...
user172775's user avatar
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1 answer
40 views

Use of convertmodis_gdal.convertModisGDAL

I tried to get ET and PET layer for MOD16A2 by using convertmodis_gdal.convertModisGDAL: modisconv = convertmodis_gdal.convertModisGDAL(hdf, output, "(1 0 0)", 500, outformat='GTiff', epsg=...
taam's user avatar
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Getting NO2 concentrations for a given area

I am trying to get the NO2 concentrations at different coordinates for a specified area. From the nc file downloaded from sci hub copernicus, I extracted the latitude, longitude and the NO2 ...
user232750's user avatar
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1 answer
47 views

Python reshaping issues of 13 band TIFF to run through Random Forest classifier

I'm having some issues that I'm seeking help with. I have a 13 band TIFF and a trained random forest classifier with 13 features that are in the correct order to match the 13 bands. I haven't made it ...
mac754's user avatar
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-4 votes
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500 views

Segment Anything Model integrated with QGIS

The Meta Segment Anything Model seems very powerful at image segmentation, and there are many development on remote sensing image segementation applications, Is there any QGIS plugins integrated ...
enri's user avatar
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1 answer
43 views

How to Fix: Layer error: Computed value is too large in Google Earth Engine

I conducted a landcover classification, distinguishing between mangrove and non-mangrove areas. For each landcover type, I gathered fewer than 10 samples. I utilized Random Forest (RF) for ...
Edudzi's user avatar
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60 views

How to produce spectral signature using SCP plugin for drone images

The SCP plugin can output spectral signatures of satellite remote sensing imagery. I'm wondering, has anyone tried to use the SCP plugin to output spectral signatures of drone-based imagery (for my ...
Jas Singh's user avatar
3 votes
2 answers
292 views

Problems importing DJI Phantom images into QGIS

I am trying to import DJI Phantom 4 multispectral imagery into QGIS. I have imported the imagery but the images are not in the right location (showing near the coast of Africa when they should be in ...
Jas Singh's user avatar
1 vote
0 answers
118 views

GEE Global Forest Change Hansen treecover and lossyear layers contradiction

In the Global Forest Change Hansen dataset, why does the layer lossyear shows several pixels as deforested in the year 2001 when the layer treecover2000 indicates that those same pixels had no forest ...
H G's user avatar
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116 views

Downloading photos from Google Street View and use then for QGIS Atlas

I am carrying out a remote sensing work (land use mapping of the Dakar metropolitan area based on sentinel2 images classifications). In order to compensate for the absence of a ground campaign and ...
user35117's user avatar
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50 views

Does Landsat satellite image should have raster value to -1 and 1?

I am calculating the NDVI for Landsat-8 using the formula as shown below:- But the pixel value rendered is as shown below: - But the NDVI values need to be between -1 and +1 however, the value ...
Pushkar's user avatar
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1 answer
59 views

Converting VICAR data to TIFF

I want to convert the VICAR data found at this ASU link to TIFF that I can use in ArcGIS Pro. How am I able to do this?
minna's user avatar
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1 answer
113 views

Creating square polygons from two known diagonal corner vertices

Similar question to How to make a square out of two points?-- I have a CSV file with coordinates for the bottom left and top right corners of multiple sampling plots and would like to make individual ...
GIS_curious's user avatar
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534 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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86 views

How to optimize Exporting CSV in Google Earth Engine

I am trying to export the mean LST values over a region for MODIS and Landsat datasets. I understand that using reducer.mean() requires high computational resources, but I have already masked out all ...
Ali Turab Hani's user avatar
1 vote
1 answer
45 views

Monthly sentinel-2 Max and Mean NDVI, and B9 values extracted to CSV

When trying to run this code I get an error: Expected Type: Image(unknown bands) actual type:ImageCollections I would also like to maintain the ID column to be the ID column in my shapefile(labelled ...
Sara's user avatar
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0 answers
127 views

Anomalous Values for MODIS LST in Google Earth Engine

I get some very big outliers when plotting MODIS LST values against Landsat LST values in Google Earth Engine. I have done the following steps: 1)Created a 'mean_LST' layer by using MODIS Terra and ...
Ali Turab Hani's user avatar
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0 answers
91 views

Converting Hansen Global Forest Change 'Forest Loss Year' into panel data structure

I downloaded the hansen deforestation loss year layer from the website (https://earthenginepartners.appspot.com/science-2013-global-forest/download_v1.7.html). It is a single raster with one band. ...
Emma's user avatar
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1 vote
2 answers
332 views

I want to test the statistical significance of the NDVI change in R

I have 20 Sentinel 2 satellite data for the period from 2017 to 2020, with 5 satellite scenes each for the months from May to September, covering one vegetation season. I am interested in whether the ...
Pebble's user avatar
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1 vote
1 answer
313 views

I want to apply Mann-Kendall test to NDVI of Sentinel 2 data in R

I have 20 Sentinel 2 satellite scenes from 2017 to 2020 with the months from May to September to cover the growing season. I calculated the NDVI of each scene and intersected it with my area of ...
Pebble's user avatar
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0 answers
35 views

Reflectance value returned from Sen2Cor

I have a query regarding Sen2Cor atmospheric correction. I used Sen2Cor in some images but I can't find anywhere if the value it is returning me in Reflectance(Rhow) or Reflectance of Remote Sensing(...
wesley santana's user avatar
0 votes
1 answer
99 views

Unable to export time series from MODIS NDVI in GEE as transforming geometry into requested projection not working

I am trying to acquire MODIS NDVI (MOD13Q1 v061) time series using Google Earth Engine for certain locations for which I have the coordinates. My code looks as follows: ////////// Input // Specify ...
Toni's user avatar
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105 views

Difference of image and imagery in writing paper

Sorry I'm not sure if I should post this question here, or in the "English language usage" site. Because this is a question typically related to the remote sensing paper. I'm writing a paper ...
wxystudio's user avatar
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0 answers
15 views

Sampling weather raster by date in GPS dataframe in GEE

I am trying to extract the u and v component of the daily ERA-5 wind reanalysis to datapoints from a GPS dataset of mule deer. I am wanting to only extract the wind to points based on the date of the ...
Luke Wilde's user avatar
0 votes
1 answer
175 views

Earthdata log in error for downloading MODIS data (R language)

I feel like I have followed all the correct steps on what is listed online here is my code: (and of course I have my correct earthdata username and password listed). setwd("~") library(MODIS)...
Aaron_Elph's user avatar
1 vote
1 answer
256 views

Difference in Index Value for Sentinel-2 and Landsat-8

I am working on bamboo distribution mapping using Sentinel-2 and Landsat-8 based on Bamboo index on ArcMap. The formula used is i.e. (BI) = (NDVI-SI)/(NDVI+SI); Where NDVI equals Normalized Difference ...
Pushkar's user avatar
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0 votes
1 answer
105 views

Resampling Sentinel-2 images

I want to change Band-11 (SWIR Bands) of Sentinel-2 to 10m resolution. I found resampling process used for it. Doesn't it affect the spectral characteristics for processing further???
Walker's user avatar
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0 answers
48 views

Antenna pattern/illumination corrections in Google Earth Engine

I am using the analysis ready Level 2.2 ALOS-2 PALSAR-2 data available in Google Earth Engine. Here is an example provided by GEE: https://code.earthengine.google.com/?scriptPath=Examples%3ADatasets%...
happity's user avatar
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0 answers
119 views

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 ...
user3496060's user avatar
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0 answers
25 views

Converting SPOT 4 level 1A from TOA reflectance to Surface Reflectance in ENVI

I downloaded the SPOT scene Level 1A: Reflectance at the top of the Atmosphere, not orthorectified to use in land use and land cover mapping applications. I would like to convert them to Surface ...
Ndahambelela's user avatar
0 votes
1 answer
364 views

Scaling satellite imagery before using it in GEE

I want to conduct an analysis on satellite imagery from the Sentinel-2 mission using Google Earth Engine, and after some research I made, I saw that the data always have to be scaled first before ...
GISGeekpro's user avatar
1 vote
1 answer
113 views

Google Earth Engine ui.Chart.getDataTable() returns empty list

I am trying to grab the underlying data from a chart in GEE. It looks like there is a built in method for this: ui.Chart.getDataTable(), however it appears to not work. I've tried on multiple charts. ...
yeet_man's user avatar
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0 answers
24 views

Surface Reflectance from WorldView-3 CAVIS Bands

I am working on a project that focuses specifically on 1 micron-region of the EM spectrum. WorldView-3 CAVIS bands look promising for my work, but as far as I know, they were designed to monitor the ...
adomac's user avatar
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-2 votes
1 answer
126 views

Sentinel-5 Data gap [closed]

I am trying to use Sentinel-5P products for air pollution analysis. Although the the satellite has daily coverage resolution, still there are some missed data in some days. It is mentioned in product ...
Mohammad Reza Shirzad's user avatar
1 vote
1 answer
203 views

Spatial resolution of Sentinel 5P

In Google Earth Engine, Sentinel 5P, Sentinel-5P OFFL AER AI: Offline UV Aerosol Index page has written the resolution is 1113.2 meters. When I checked the image properties it is mentioned that the ...
Mohammad Reza Shirzad's user avatar

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