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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37 views

Correcting offset between LiDAR datasets

I am analyzing multiple LiDAR datasets looking at the changes between pre-wildfire and post-wildfire topography. The datatsets are of the same general location. I did not acquire the datasets on my ...
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clred- edge index for canopy chlorophyll content

I want to use clred-edge chlorophyll index to extract canopy chlorophyll content (CCC) from Sentinel-2 But based on the various articles I've read, I have two questions Is there a numerical range ...
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1answer
222 views

How can you use scikit-learn to do PCA on a 9 band raster image?

I would like to do a PCA on a 9band raster image to reduce the total number of inputs bands to 3. However, I'm not able to do it as I don't think I understand what sklearn is doing in its PCA. Some ...
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21 views

What exactly does the MODIS Land Cover QA-Class “Backfilled label” mean?

This is about the MCD12Q1.006 product and more specifically code 8 of the QA band. The description for it is: Backfilled label: Missing label from stabilization, filled with the pre-stabilized ...
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344 views

“Error in .subset2(x, i, exact = exact) : subscript out of bounds” in R-programming

I am trying to apply Radiometric correction to Landsat image in R. I tried with the following code and got the error. metadata <- readMeta("LT05_L1TP_141041_20110129_20161010_01_T1_MTL.txt") ...
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49 views

Guide book of SNAP

I would like to study SNAP Software made by ESA. I don't find any PDF or book online. Have you any ideas where I can find it?
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18 views

What unit of measurement is rxwaveform from the GEDI L1B dataset in?

Rxwaveform is listed in GEDI's data level product L1B's data dictionary as "The corrected receive (RX) waveforms. Use rx_sample_count and rx_sample_start_index to identify the location of each ...
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38 views

Nearest Neighbor Global matching

I'm trying to compare two datasets; a satellite image and some known points. In the satellite image I've got 20 to 50 detections that should match up to a set of lat/lon points that I have. There is ...
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1answer
478 views

Pansharpening Sentinel-2 imagery in Google Earth Engine

I am attempting to pansharpen Sentinel-2 imagery in GEE in order to determine the amount of land covered in water at my field site locations (probably will calculate MNDWI on sharpened image). I do ...
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25 views

How to extract a panchromatic image from hyperspectral image

I'm new to the Remote Sensing domain and I'm working on Hyperspectral Pansharpening problem. I'm referring to the paper, "Hyperspectral Pansharpening: A review" (link). They have provided the code for ...
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1answer
104 views

Landsat-8 level 2 DN to reflectance

I have downloaded a series of Landsat-8 level 2 images. My main purpose is to obtain reflectance out of them; however, the scale of the different bands does not look like reflectance (e.g. Blue Band ...
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29 views

Projects using compatible Sentinel-2 and Landsat-8 reflectance data

Right from the beginning on the Senintel-2 Satellites were constructed to harmonize with the Landsat-8 products in terms of their spatial and spectral capabilities. What I wonder is, if there are ...
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33 views

Create new color-balanced raster from neighboring rasters

I have some true color 4 band (RGB+alpha) orthoimagery that I collected using VTOL fixed wing drones. Some of the images are darker than others due to the time of day, solar vignetting, and cloud ...
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1answer
637 views

Plotting Time Series of different products in Google Earth Engine

I want to stack different EVI time series (MODIS and SENTINEL 2, potentially more) of a given pixel with ui.Chart.image.series similar to this: https://developers.google.com/earth-engine/...
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1answer
195 views

Terrain correction (flattening) of Sentinel 1 images

Using the script available in this forum (belowlink), I tried for terrain correction (flattening) of Sentinel 1 images Getting local incidence angle from Sentinel-1 GRD image collection in Google ...
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1answer
54 views

minnaert correction

I want to apply minnaert topographic correction, for all scenes over roi by computing coefficients? Method: minnaert ref_c = ref_o * (cos_z / cos_i) ^k where, k is obtained by linear regression of ln(...
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1answer
132 views

Error on topographic correction

I tried to modify the Daniel's script to apply Tan's topo correction method. Here is Tan's method. https://geog.umd.edu/sites/geog.umd.edu/files/pubs/1-s2.0-S0034425713001673-main.pdf https://code....
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1answer
113 views

Topographical correction of Sentinel-2 data

I tried to apply the SCS+C, a modified Sun-canopy-sensor topographic correction, algorithm for all scenes over my study area for a year. https://ieeexplore.ieee.org/document/1499030 But it ended with ...
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27 views

Proper formula for computing signal-to-noise ratio of a camera?

I have a 5-band muultispectral camera, and I'm trying to find the signal-to-noise ratio (SNR) to supplement some research data I collected. Cameras with low SNRs generally have lower-quality images ...
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166 views

PlanetScope NDWI calculations

I am trying to calculate NDWI for a PlanetScope image scene. I currently have 2 products: one is the "3B_AnalyticMS_SR.tif" and the other is the "3B_AnalyticMS.tif" product. I believe the former is ...
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1answer
86 views

How to compute LST every 3rd day for 19 years (Earth Engine)

I want to calculate LST for every 3rd day from 01-02-2000 to 31-12-1-2019, I don't Know how to do that. Using MODIS/006/MOD11A1 var lst = lstImg.select('LST_Day_1km') .filter(ee.Filter.date(...
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17 views

Sentinel 2 Conversion Relectance to Radiance?

Sentinel 2a level 2 digital number is a surface BOA reflectance. I want to convert this number to radiance, how should I do it? I use ArcGIS or Snap (there is reflectance to radiance but it requires ...
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38 views

Using computer vision for linear feature detection [closed]

I am considering to use CV methods to detect linear features in very high resolution imagery (i've added an example below). These linear features are made by animals which transverse this section of ...
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1answer
68 views

I want to calculate a area of NDWI for a region for each month over for 10 years in Google Earth Engine

I want to calculate a area of NDWI for a region for each month over for 10 years in Google earth engine. I have a starting date and Ending date array for every month for each year.Using Image ...
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1answer
50 views

Verifying that it is ok to use multiple band combinations as I create polygons for my supervised classification?

I am sorry if this is a naive question, but I am very new to remote sensing analysis. I am conducting a supervised classification in Google Earth Engine. I want to verify that as I develop my ...
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70 views

Why am I unable to create overviews in QGIS despite having disk space

I have 120 GeoTIFF files, totalling around 250GB of data. Files names are from 1.tif to 120.tif. I tried to create overviews for all the files in one go usinggdaladdo in terminal. While overviews ...
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1answer
20 views

Targeted Region of Interest Classification in eCognition

Is there a method of targeting only specific areas for classification in eCognition? Say, maybe using pixel coordinate constraints?
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30 views

The emissivity of snow

I try to use the NDVI Based Emissivity Method to calculate the LSE. But the function almost applied over surfaces composed by soil and vegetation. Over surfaces like water, ice, or snow did not ...
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2answers
199 views

How to calculate and export tasseled caps from MODIS collection in GEE?

I would like to calculate and export the brightness, greenness and wetness tasseled caps for the MODIS MCD43A4 V006 collection based on the Lobser coefficients, but I have no idea how to do it. var ...
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0answers
41 views

Is it possible to detect human settlements by night light data?

I am working on a project in which human settlements are identified using geo-tagged Twitter data. Since this project is focused on developing countries (mostly African), I am afraid that many human ...
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1answer
229 views

Atmospheric correction for planet images using ArcGIS Desktop

I am very much new to the field of image processing. I have several images from planetscope. 20190722_155754_1049_3B_AnalyticMS is one of them. I don't know how to process these images in ArcGIS ...
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37 views

Whether NOAA AVHRR NDVI V5 already remove cloud?

We want to use NOAA/CDR/AVHRR/NDVI/V5 datasets for analysis, but we are not sure if the NDVI already remove the cloud and cloud shadow or not? Need we use 'QA' to remove the cloud and cloud shadow ...
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38 views

Planetary Reflectance vs Relative Spectral Response

I am confused between a Planetary Reflectance and the Relative Spectral Response (RSR). What I know/guess is that RSR is a response/function of an Instrument band's reflectance against a spectral ...
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1answer
67 views

Is the Enhanced Vegetation Index normalized?

I am trying to figure out if the Enhanced Vegetation Index (2-band) is normalized or not? My first guess is that it is, but due to a multiplication factor of 2.4, I'm not sure if it is or not. The ...
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1answer
71 views

Produce NDVI on Landsat1 satellite images?

Does someone have any experience to produce NDVI on the Landsat1 satellite image? What kind of atmospherical correction (on Landsat 1) technique is necessary to perform before producing indices? Is it ...
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1answer
31 views

What sources of free multispectral satellite imagery are there in Europe other than Sentinel 2?

I am looking for free multispectral satellite imagery for north Germany prior to 2015. Does anyone have a list of sources?
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1answer
191 views

When working with MOD09GA product, is supposed QC bitmask for high aerosol quantity to return 4 values?

it's the first time I'm working with MODIS data and I am a bit confused about how bits work and how masks are created. After a bit of research I've been able to understand, more or less, how bit ...
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2answers
2k views

Extract cell values and coordinates from raster using a polygon in R

I'm trying to extract cell values and coordinates from raster using a polygon in R. I have multiple raster layers with different types of values, all within the same extent. I have multiple polygons ...
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1answer
421 views

RGB composite of Landsat 8 bands not plotting correctly (Python, GDAL)

I am trying to create a natural color (RGB) image from Landsat 8 data (11 bands). Bands 4, 3, 2, correspond to red, green, blue respectively. When I stack them, however, the images i am getting are ...
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2answers
1k views

Convert hdf5 LiDAR data (from GEDI) to LAS or LAZ

I downloaded GEDI LiDAR data in hdf5 format. How can I open this file or convert it to the standard LAS format (point cloud)? When I tried opening the hdf file with QGIS and I got the following ...
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0answers
63 views

Calculating proportion of pixel containing vegetation (from sentinel 2 image stack)

My task is to perform a supervised classification of landcover across a huge (20,000+ hectare) property. I need to classify into three classes: forest, regenerating trees, and soil. We use s Sentinel-...
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1answer
146 views

ArcGIS Pro 2.4.0 Image Segmentation - Higher spectral and spatial detail for high-resolution images?

I was watching a video regarding image segmentation in ArcGIS Pro 2.4.0. It was an ESRI event (2018), so the presenters were ESRI employees. Here's the video I am referring to: https://www.youtube.com/...
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2answers
514 views

Spectral signatures chart in Google Earth Engine

I have been reading the documentation and some related questions online, but I cannot seem to make it work. I use Google Earth Engine to access an old Landsat 5 image, and classify later on. I want ...
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2answers
294 views

Min and Max for each image of NDVI to calculate Em and LST

I am working on my script to calculate LST for all the images in the collection separately and then use the calculated LST to estimate Mean Annual LST. I have calculated NDVI for each image, and the ...
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1answer
202 views

How to export raster of Mean Annual Land Surface Temp from Landsat Imagery?

I am using google earth engine to estimate Mean Annual land surface temp of a local scale from 1984 to 2019 from landsat Imagery. I am having trouble determining a script for my goal, there are many ...
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1answer
396 views

Seeking open source software or python packages to create orthomosaic and DEM image from UAV images [closed]

I would like to analyse UAV 2D images to create 3D point cloud, DES, and orthomosaic image. Can you suggest or mention some open source software or python packages?
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1answer
129 views

Pixel Size field in gdalinfo command meaning

What is the meaning of the Pixel Size field in the gdalinfo output on a TIFF image? I have 2 images, one is a PAN image (size 400MB) while one is a DEM (size 25MB). Both are in TIFF format. When I ...
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0answers
46 views

Calculating indices by Multiple polygons

Is there a way in QGIS to perform band math within each area defined by different polygons without clipping the rasters and performing calculations on each one? I have a vector layer with several ...
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0answers
229 views

Error with ROI Semi Automatic Classification Plugin QGIS 3.4

I have troubles for making ROI with SCP plugin in QGIS 3.4. I dowloaded some landsat images with the plugin and trying to create ROI. To do it, I made a Bandset with DOS1 atmospheric correction, ...
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2answers
154 views

Manipulating Sentinel-1 SAR Imagery to get Pixel Information

For S1 SAR imagery data, how would I go about accessing the data of individual pixels? I need to analyze pixel intensity based on their lat and lon coordinates. I know this information is viewable in ...

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