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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19 views

Choose bands for LST (Landsat 8) in Google Earth Engine

I want to get LST from Landsat 8. I prefer to use Google Earth Engine(GEE), and use the code that they are offer: https://code.earthengine.google.com/?scriptPath=Examples%3ADatasets%...
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31 views

Pansharpening Sentinel-2 Image Collection in Google Earth Engine

With reference to (Pansharpening Sentinel-2 imagery in Google Earth Engine) and (Blank Image - Pansharpening Sentinel-2 imagery in Google Earth Engine). I am trying to use the code for an image ...
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32 views

Image Stacking showing is stacking all the bands in the whole image collection instead of images in the filtered image collection date

I have created my image collection of 36 images and I have mapped the NDVI function over it. I created a stacked image and assigned the kNDVI band to the image. However, it is showing 865 bands ...
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15 views

SEBAL for Landsat 8

The SEBAL manual for Landsat 5 TM and Landsat 7 ETM+ is available on the internet, however, this manual is not applicable to a certain extent if the researcher needs to estimate evapotranspiration ...
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9 views

How to create change/no-change map?

Recently I've been working on polarimetric SAR images. I have two images from two different timestamps of some agricultural areas. Based on these two images, I want to create a map telling which parts ...
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27 views

Google Earth Engine: Creating a Stacked Image of NDVI from an Image collection

I wanted to create a stacked NDVI image from an image collection that has been mapped with the NDVI band. So I was wondering if I could use the toBands() to create 1 stacked Image from the collection ...
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19 views

Land use land change map with Landsat

I'm preparing land use maps for various years using Landsat 8 and Landsat 7 imagery. For Landsat 7, I've decided to not fill the gaps for SLC as it might result in inaccuracies. For the land change ...
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6 views

How can I relation aerosol particle size (2,5 and 10 microns) with the aerosol index measurement of Sentinel-5P (TROPOMI)?

I would like to know the relation of aerosol particle size (2,5 and 10 microns) with the measurements from the Sentinel 5p (in the wavelengths 340_380 and 358_388)
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26 views

NIR.subtract is not a function

I am trying to calculate Kernal NDVI (kNDVI) and the code keeps giving me this error. The link to the code: https://code.earthengine.google.com/24e8503ec2f264d0ffe0ba1bfe4c6353 /// adding shapefile to ...
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10 views

How to filter for Sentinel-2 scenes that don't contain all band data

The registry of open data in AWS lists Sentinel-2 satellite imagery in requester-pays s3 buckets. How would one build a list of scene folders, per tile, for which all 13 bands (*.jp2 files) are ...
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49 views

CRCError: Invalid Projection: EPSG:4326 for Sentinel API Script & AttributeError: module 'pyproj'

I am realatively new to Python programming and have an issue with pyproj mixing up the CRS database (this is what I gather from the web). I have a little script I've written to retrieve Sentinel ...
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6 views

How to change image background value to zero in ENVI

I have two tiff images with the same background value of 2568.768956. I tried to mosaic them using ENVI and specified the "ignore value" as 2568.768956. However, ENVI automatically rounds ...
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60 views

Calculating Enhanced Vegetation Index (EVI) using Sentinel-2 Level 1C, value problem

I am trying to calculate EVI values from Sentinel-2 Level 1C. When I calculate the EVI with this formula : (2.5 * ("Band 8" - "Band 4")) / ("Band 8" + (2.4 * "Band 4&...
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23 views

TIMESAT seasonality values different orders of magnitude

I'm using TIMESAT 3.3 to find the seasonality parameters of a specific part of Ontario, using both the ASCII and image input methods. I've used the ASCII input method for specific points in the area, ...
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24 views

TIMESAT raw .tts not found

I'm using TIMESAT 3.3 on a Windows 10 computer. I'd like to use TSM_viewfits to see the original raw data and the fitted data for a processed ASCII file, but I do not have a .tts file containing my ...
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24 views

Does Sentinel-2A Level-2A data require spectral correction?

I submitted a manuscript that uses Sentinel SAFE (Standard Archive Format) Level-2A (bottom of atmosphere) data. Sentinel-2A data includes scene classification and an atmospheric correction - https://...
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25 views

GEE: hourly to daily evaporation ERA data

I'm trying to aggregate hourly data from ERA5 land to daily data over a specific shapefile in GEE. In theory my code is working, however, the output gives the same amount of evaporation for the entire ...
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14 views

Extracting spectral signatures from ROI using ENVI5.3

I used ENVI's Band Math functionality for calculating a certain index to find out the dominance of a mineral. The output is one monochrome band as seen below, I really need your help to learn how to ...
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5 views

Cloud and shadow detection for land use classification using rgb + B8 and B11+B12 of the sentinel satellite with a time series

I was wondering if there was a standard approach to detect clouds, snow and other such anomalies using the rgb B8 and B11+B12 data. Most of the approaches I have found such as Sentinel2Cloud also make ...
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23 views

Modified Chlorophyll Absorption Ratio Index (MCARI) vs Green Chlorophyll Index (GCI) in a desert

I am using UAV multispectral data to compute different vegetation indices. Both of these indices were computed with the purpose of seeing/assessing the chlorophyll content, thus indicating if the ...
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34 views

Alternative for Normalized Difference Built-up Index (NDBI) using satellite imagery with RGB & NIR bands

I am currently working with Planet SkySat multispectral imagery in Google Earth Engine (dataset description). It has only Red, Green, Blue and NIR bands. My objective is slum mapping and for this, ...
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38 views

MSAVI vs NDVI for deserts

I calculated NDVI (Normalised Difference Vegetation Index) and MSAVI (Modified Soil Adjusted Vegetation Index) for a desert environment, where most of the vegetation is shrubs with some trees using ...
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50 views

Converting Aster L1T data radiance to surface reflectance in Google Earth Engine

I'm working with Aster data in GEE and it's necessary to convert radiance in surface Reflectance values. I've tried to convert DN to TOA values, like this. It works. But I'm a little confused about ...
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26 views

Why does Landsat 8 Collection 2 Band 10 data has spots with no values?

We're currently researching urban heat distributions in Germany using Landsat 8 data. As stated in the Collection 2 Level 2 Science Product Guide, Band 10 of this product is the processed data of ...
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22 views

Strange phenomenon in remote sensing index NDWI

I'm mapping water bodies in my region with Sentinel 2A Level 2-A imagery. I used ArcGIS Pro Raster Calculator to take (Band 3 - Band 8) / (Band 3 + Band 8) to get Normalized Difference Water Index. ...
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38 views

Haze correction of Planet SkySat Public Ortho Imagery, RGB

I am using image - https://developers.google.com/earth-engine/datasets/catalog/SKYSAT_GEN-A_PUBLIC_ORTHO_RGB for slum quantification purpose but the problem is - the image seem to have haze as image ...
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1answer
34 views

Spectral angle mapping from reference spectra in QGIS

I am trying to classify an ASTER image based on VNIR and SWIR reflectance of various rock types. I have standard reflection data for each rock type from the USGS spectral library and want to preform a ...
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85 views

Cropland field delineation using OpenCV and Google Earth Engine

I want to follow the methodology in the following article in order to find field boundary delineation automatically: "Multi-Temporal Crop Type and Field Boundary Classification with Google Earth ...
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1answer
30 views

GEE: projection error when exporting data to a table

I am trying to export some vegetation condition index data calculated from MODIS data on Google Earth Engine to a table, but keep getting the error: Error in map(ID=3): Image.reduceRegions: Unable to ...
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33 views

Extract lines of rice terraces from satellite image

I have a Pleiades image and multiple rice field boundaries in a shape file. What I want to do is for every feature in the shape file, clip the Pleiades image and detect the lines of the field terraces....
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38 views

Indices similar to EVI for vegetation health analysis using UAV multispectral data

I know NDVI is the most commonly used index to start with vegetation health analysis. I am looking for other indices that can be calculated when the available UAV imagery has NIR, Red, Red Edge, Blue ...
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29 views

TRMM Values Conversion From Float to Integer in Google Earth Engine?

In the below code TRMM product values converted from float to integer type in Google Earth Engine. However after the conversion TRMM product just shows 0 and 1. How can I can do conversion without ...
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1answer
44 views

What is the appropriate input scale factor for EVI?

I am trying to calculate the Enhanced Vegetation Index using Landsat surface reflectance data. The formula for EVI using standard constants is: EVI = 2.5 * ((NIR – Red) / (NIR + 6 * Red – 7.5 * Blue + ...
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24 views

Conversion of UAV DN values to reflectance

My aim is to carry out fusion between Sentinel 2 and UAV images. Sentinel images are already converted to reflectance values but UAV images are in DN number format. How can I convert UAV DN values to ...
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21 views

Planet SkySat - Differences between image strips

I'm trying to understand why i'm seeing variations in the analytic (surface reflectance) imagery brightness values in Planet SkySat imagery between image strips that were collected around the same ...
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153 views

Issue with scaling factors for Landsat Collection 2 Level 2 data when calculating NDVI

I'm trying to calculate the NDVI for a scene, and I've downloaded Landsat 8 OLI/TIRS Collection 2 Level 2 data, which means it has already been processed to surface reflectance. The scaling factors ...
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1answer
82 views

Intake-STAC: KeyError: 'open_stac_item_collection'

I downloaded the AWS Earth search notebook from the intake-stac examples and whithout changing anything. Just run the cells... But I've got everytime the error: KeyError: 'open_stac_item_collection' ...
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17 views

Computation Time Out in Complex Multi-Band Normalization of Sentinel 2 Image Composite

I am trying to implement Pseudo-Invariant Feature Normalization for Sentinel 2 image in 2015 based on the median composite acquired in 2019 (script can be found here). I once ran the script without an ...
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46 views

Process large ROI in GEE

I am calculating the VCI for Europe, but the ROI is too large for a single run in GEE. How can I divide it and process it in chunks so that when downloaded they fit into a single image/composite? var ...
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1answer
81 views

Mapping paddy rice fields with PMI(Paddy rice mapping index) with Google Earth Engine

I would like to perform mapping paddy rice with the Google Earth Engine for large scale. I came across with an article which proposed method for mapping paddy rice with special index related to ...
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2answers
39 views

Extracting shorelines from BW aerial photos using ArcMap

I'm currently trying to analyze rates of shoreline change for an estuarine reserve by extracting & vectorizing shorelines from historic aerial photos, and then comparing those to the modern ...
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1answer
70 views

Set axis in Google Earth Engine Chart

I'd like to compare LAI (Leaf Area Index) data from the same region over different times using ui.Chart.image.series in Google Earth Engine. I'm trying to set the axis to the same range, in order to ...
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61 views

Removing cast shadow from Landsat 8

I've got Collection 2, level 2 Landsat 8 dataset which contain mountains. The problem is the cast shadows from the mountains, so that I can't classify these pixels well. These pixels have much lower ...
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74 views

Smile Random Forest / computation timed out /Computed value is too large

I want to make a binary clasificación (1 = burned area, 0 = non burned area) using smile random forest, to train Sentinel 2 SR (12 band included NDVI and DBR) and get new burned trained areas. I try ...
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1answer
49 views

Filter by bound on Google Earth Engine not covering the whole of bound feature

I tried to filter Sentinel-2 image collection by bound, then I visualized the first in the collection after clipping to the bound feature. The problem is that the returned images does not cover the ...
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73 views

RS & GIS (QGIS Plugin) not producing Land Surface Temperature Layer

Recently I downloaded this plugin as it has demonstrated capability to produce Land Surface Temperature Calculated layer. I tested this plugin using the Landsat 8 contents straight from USGS Earth ...
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981 views

What is lost when converting 12 bit imagery to 8 bit?

SPOT 6/7 satellite imagery is captured with a dynamic range of 12 bits per pixel per channel (ref). However almost all of the SPOT imagery I have seen in use has been 8 bits per channel, and split ...
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14 views

How to estimate the land surface temperature using ASTER image in ENVI 5.3?

I am doing research about land surface temperature using ASTER image. I have read literature but i cannot do it in ENVI 5.3. Could you provide step-by-step to calculate land surface temperature using ...
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71 views

Resampling Sentinel-2 ImageCollection on GEE having the bands with the same spatial resolution

I'm a beginner at Google Earth Engine. I've seen on previous topics that resampling can be made on single images, like in this topic on downscaling raster images. I have an ImageCollection of Sentinel-...
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10 views

Satellite image is cut, when the composite tool is run on it- ArcGIS

Hi I am using satellite imagery in my project. The images come in squares, after using composite to join the bands, one square shrinks or is clipped somehow. Does anyone know the solution? Thanks. ...

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