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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1answer
53 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
29 views

How to visualize large .tif file which is a multispectral image

This image is supposedly a 5m multispectral multi-temporal (LISS IV) data of a place in India called Satna. It is a .tif format file of size around 32 MB. Image should typically have greenery(...
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14 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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1answer
53 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
35 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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18 views

Batch downloading LANDSAT imagery based on nearest image capture date

I have a 30-year large dataset (100,000+ points) of insect outbreaks (0=no out break, 1= outbreak) throughout Australia. I am interested in seeing if the spatial configuration of vegetation is a ...
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1answer
4k views

Selecting bands of image collection in Google Earth Engine?

I want to use the Landsat 8 surface reflection collection (LANDSAT/LC08/C01/T1_SR), which contains the 7 spectral bands plus some extra mask bands. I want to run my algorithm on just the 7 spectral ...
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1answer
35 views

Mask clouds across multiple images using Google Earth Engine

I Have multiple Landsat8 images at the same place in different years. I want to have a cloud mask for each image, then merge the mask so that all images will be masked with a same aggregated mask. I'...
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2answers
197 views

Computing MNDWI for Sentinel 2 Images in Google Earth Engine?

MNDWI is the normalized difference of Green Band and SWIR Band. In LANDSAT both are of a similar resolution i.e. 30m. In the case of LANDSAT var landsat8 = ee.Image("LANDSAT/LC08/C01/T1_RT_TOA/...
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1answer
90 views

Unable to download VIIRS images with GIBS API and gdal_translate

I'm trying to download some VIIRS images from GIBS API. I'm using gdal: gdal_translate -projwin 19.07 42.16 28.39 34.5 -of "GTiff" "viirs.xml" "VIIRS_SNPP_DayNightBand_ENCC.tif" The viirs.xml file ...
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3answers
2k views

How to analyze Vegetation Index using Sentinel-1 SAR Imagery?

I am using the ESA open scientific data hub for Sentinel 1 SAR imagery (Interferometric Wide swath SLC VV polarization) and would like to know how to perform vegetation health analysis from this data? ...
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2answers
9k views

Layer stacking Sentinel 2 imagery

Is it possible to layer stack all 13 Sentinel 2 bands or can I only layer stack those that are the same resolution (so for example the blue, green red and NIR bands). I have a very large area of ...
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1answer
33 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
934 views

Seeking VIIRS Day Night Band and alternatives for night satellite images [closed]

Has anyone worked with VIIRS Day Night Band? I want to download few images to get a map of night scene of Central Europe (city lights etc). I use friendly interface at NOAA (http://www.class.ncdc....
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1answer
14 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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1answer
773 views

Accuracy assessment in Erdas imagine

Is it necessary to do an accuracy assessment for an unsupervised classification done for a Landsat 5 image?
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2answers
621 views

Get ASTER full bands file

I am having some problems on downloading ASTER data. When I download a Landsat-8 scene, it cames with the full bands on it (14 band files), an metadata file and a quality file. I need to download ...
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2answers
2k views

Detecting cloud shadows

I am trying to detect cloud shadows in Landsat images. I came up with producing good shadows and cloud masks. Now I'd like to implement my cloud mask adding cloud shadows. Do You have a good idea to ...
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132 views

What does Google Earth Engine's image.unmix() differentiate from other implementations?

I want to realize a project with spectrally unmixed Landsat imagery. However, I find no satisfying information on the respective GEE function, image.unmix(). I processed a few scenes with the exact ...
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2answers
1k views

ENVI band math incorrect values

I'm attempting to calculate vegetation indices in ENVI 5.2 using level-2 AVIRIS data in band math. The indices I'm working with are Vogelmann Red Edge 2, normalized difference red edge, and red edge ...
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1answer
92 views

Whether Sentinel 3 OLCI can be used as a MODIS replacement for 250m NDVI?

Based on the bandwidths MODIS bands 1 and 2 (620nm - 876nm) will match S3 bands Oa7 - Oa17 (620nm - 865nm) I am just trying to know if anyone had any experience in using S3 data instead of MODIS for ...
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1answer
505 views

Extract Pixel Values for Multiple Polygons and Images

I have 21 polygons and for each polygon I want to extract the pixel values inside them for Sentinel 1 images from 2017-01-01 to 2017-06-30. The example below shows how this is done for one polygon. ...
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1answer
32 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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0answers
26 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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0answers
34 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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2answers
948 views

Applying pixel reliability mask to time series MOD13Q1

I am working with a 23-band GEOTiff in which each band is a 16-day MVC MODIS NDVI image. The MODIS .hdfs include a "pixel reliability" image with the following values: [-1]: Fill/No Data-Not ...
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2answers
1k views

Image classification using google satellite images

Currently our expert user classifies locations by viewing the Google earth satellite image of a location. They consider circular areas of a 5km radius at a set zoom level. They evaluate the image for ...
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51 views

Seeking Soil Mapping data in Southern Africa?

I am researching soil quality in Zambia but I’ve been unable to find georeferenced soil datasets (e.g. soil samples) for my area of interest. Specifically, I want to get yearly soil sampling data in ...
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26 views

SAR calculating distance between 2 points

I am playing around with ESA's SNAP software and Sentinel-1 data and I was curios if it is possible to measure the ground distance between 2 points in a radar image. For example let's say that I am ...
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1answer
45 views

Sentinel-1a real azimuth resolution

I was exploring this satellite's payload characteristics on ESA's website and I saw that it's azimuth resolution varies a lot. For example azimuth resolution for IW mode is 22m (https://sentinel.esa....
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66 views

Enhanced Vegetation Index( EVI) Value Interpretation

Im working on calculation of Calculation of Enhanced Vegetation Index(EVI) From Landsat 5 TM and Landsat 8 OLI Using ArcMap 10.4.1. As far i know to Calculate EVI, first it needs to Convert the DN ...
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0answers
28 views

Why does a raster that consists of 3 bands appear greyed out?

I have a raster that is formed by stacking the bands blue, green and red of "Landsat 8", when it is displayed on Erdas Imagine 2015 it appears as if there is a semi-transparent grey layer over it, the ...
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1answer
72 views

Dataset description AREA_OR_POINT

What are the differences between these two options in satellite image metadata?
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1answer
32 views

Evaluating elevation change between multiple LiDAR datasets

I am hoping to get some insight from others who are familiar with comparing multiple LiDAR surveys to one another. I have two LiDAR surveys with similar extents that I would like compare for elevation ...
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1answer
38 views

Finding sericite alteration in ENVI 5.3 spectral library?

I work on an area where there is a sericite alteration and i searched for the sericet and did not find a word. I want to know what is called sericet in the spectral library of ENVI 5.3? Sericite is ...
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28 views

Calculating/estimating carbon content in soil by using Remote Sensing

I am analysing sugar cane crops with QGIS and need to estimate the soil carbon content to evaluate the nutrition status of the crops. The problem is that I don't have ground data so there is no ...
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2answers
102 views

Remove Angle or Projection in GDAL

I am completely new to GeoData so this might be somewhat of a silly problem, but I am having a problem with the angle GeoTIFF images tend to come with. I am collecting satellite images for a deep ...
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5answers
2k views

Bulk Download App 'Insuficient Previledges'

Ordered Landsat 7 data from USGS and wants to download it using the Bulk Download application. However, i get this error while running the software. I have JRE Installed properly. Does someone knows ...
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1answer
82 views

Which band to use for LSWI?

I have a sentinel 2 L1C data and I am trying to calculate the Land Surface Water Index (LSWI) using the NIR and SWIR bands. As the Sentinel 2 data is having 2 SWIR bands (B11 and B12), I am confused ...
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2answers
91 views

Can BFAST algorithm be applied to to a whole study area/ ROI?

I am working on identification of breakpoints in Landsat based NDVI time series (1990-2018). I am using The Breaks for Additive Seasonal and Trend (BFAST) algorithm which is a pixel based time series ...
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1answer
376 views

Raster pattern recognition

I'm wondering if it is possible to do pattern recognition with QGIS. I have 5 NDVI Landsat images and I try to find areas automatically (constant pattern). Is there a tool in QGIS? The pic below ...
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1answer
445 views

How to add color-map scale in Google Earth Engine?

I want to add a colormap scale like below in my Earth Engine app. I cannot find a UI component for this. Can I do this in any other way in Earth Engine?
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1answer
56 views

Moisture Stress Index - how important is seasonal influence in a deciduous forest?

I want to calculate moisture stress index for a deciduous forest using the formula from the article 'Detecting vegetation leaf water content using reflectance in the optical domain' (Ceccato et al. ...
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1answer
674 views

Pansharpening radiance/reflectance of Landsat 8 in GRASS 7?

first at all, I have to say that I'm new GRASS user. I would like to make a pansharp in GRASS 7 with reflectance Landsat 8 bands. I have revised some related posts and blogs, and I didn't find out if ...
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1answer
2k views

Examples of GIS or Remote Sensing in movies

Looking for examples where GIS or RS has been a part of a movie plot. I'm trying to put together a "GIS & RS and the Cinema" class, in which examples of GIS & RS are shown. Those examples will ...
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1answer
34 views

Conversion of MLS/AURA RELATIVE HUMIDITY PRODUCT to correctly referenced GeoTIFF

I have downloaded the following product https://cmr.earthdata.nasa.gov/search/concepts/C1251101764-GES_DISC.html and it gives me a .he5file. Can anyone help me in correctly geo-referencing the file ...
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1answer
48 views

Applying Google Earth Engine cloud mask on each individual image BEFORE mosaicing the images?

How can I apply a cloud mask to each individual image in a collection THEN mosaic them together based on (for example) mean pixel value across images? The code does not work because the maskClouds ...
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1answer
30 views

Is re-gridding a good idea?

I am working with MODIS Aerosol data (the Level-2 AOD_550_Dark_Target_Deep_Blue_Combined product). I am retrieving the data using the LAADS DAAC data API, and requesting all swaths as GeoTIFF files. ...
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1answer
29 views

Geolocation of L2G-Lite MODIS data

I would like to know if I am processing an L2G-Lite MODIS product, do I still need to geolocate, or reproject it to EPSG:4326? Or can I just leave it?
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8 views

TIMESAT3.3 output errors

When I ran "fit2img" in TIMESAT3.3,I got problematic result image.Contrasted with original image, this result image seemed to be cut into two parts and was badly deformed.I did not know what happened....