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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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241 views

### NDVI calculation problem

I have photo created by UAV, and I want to calculate bNDVI: (NIR-blue)/(NIR+blue) I have these bands (filter is ok -100%). So using QGIS I have values -0,1-> 0,3 - but bNDVI must be from 0,65->0,...
744 views

### Convertion of spectral indices formulas from Landsat to Sentinel

There are many spectral indices in literature. However, the formulas mostly refer to landsat imagery, and thus the corresponding spectral bands. Question: How can a formula that was originally ...
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 ...
1k views

How do you write the MSAVI formula in JavaScript function for Google Earth Engine? I am trying to calculate the MSAVI as a function. The aim is to map the result over a Sentinel-2 composite and not a ...
107 views

### Vegetation Index for dry and sparse vegetated areas?

I found many different index for the estimation of vegetation cover, but many of them struggle in sparse areas with low vegetation cover, as the soil signals are way stronger than the vegetation ...
1k views

### Select pixel values in a raster using R

I'm trying to select some cell values in a raster MODIS. Follow my problem: I have to filter these values to mask after it: 32767,32766,32765,32764,32763,32762,32761 I've used this code to one value:...
74 views

### How replace n values in a raster using two different rasters in R?

I have 2 raster and I wanna do it: raster 1 is a water mask where 1 means water and 0 surface; raster 2, I wanna exclude water using raster 1. So, I wanna make a script like that: if water is 1, ...
67 views

### How can I export a Numpy array made from MODIS data for use in ArcMap?

I have an array made from MODIS Terra Daily snow data that I would like to export for use in ArcMap. How would I output the 'probablility_of_snow array' array near the bottom of this post to an image ...
222 views

### Cloud detection in various scenes in R

I have 99 LS8 scenes (mountainous terrain) and before processing them any further I would like to mask out cloudy and snow pixel since they might mess up the topographic correction I have to apply. My ...
418 views

### Open .fit image file

I am trying to open an image file with the extension ".fit". Does anybody know which software to use? I obtained this image using the WASI software (Water Color Simulator) available on the IOCCG ...
445 views

### R: Display single band raster in true color

I have a static image of a Bing maps tile (Mercator EPSG: 3857) with satellite overlay in PNG format. I read the PNG as a raster and georeferenced it in R by setting the corner coordinates using the ...
163 views

### Is it required to do DOS using Sentinel 2 image for land cover change detections

Sentinel 2 imagery is already ortho-corrected and georeferenced. However I wish to know how important it is to correct further and which correction to carry out.
1k views

### Splitting RGB image into separate bands using Drone (DJI Phantom imagery)

Previously I have made marine habitat maps using multiband imagery and remote sensing techniques (e.g blue, green and red bands from satellite imagery). I am now attempting the same process however ...
41 views

### How does MERIS collect vegetation height data?

In GlobCover 2005 and 2009 project, the sensor used for spectral data collection was MEdium Resolution Imaging Spectrometer (MERIS). It observes the Earth in 15 spectral bands in visible and near ...
325 views

### Is Landsat 30m resolution satellite images accurate enough to map land cover on a 40 km² watershed? [closed]

I am trying to remote sensing land cover features (bare soil, water, vegetation, cultivated areas) on a 40 km² watershed, located in the Sahel (semi-arid west africa). I am heavily interested in their ...
114 views

### How to choose pixel value for NoData when clipping satellite imagery? [closed]

I downloaded a Sentinel 2A image because I want to obtain different index for land usage. I need to clip every band of the satellite imagery using the Clip Multi Layers plug in. The plug-in defaults ...
45 views

### ALOS DEM shows continious no data how to over come?

How to overcome No Data in ALOS DEM which acquired at location of Ernakulam, Kerala. Attached .JPG screen shot of my screen. Why it is showing NODATA??
894 views

### Using MODIS data in ArcMap?

I have downloaded MODIS data (from ladsweb.modaps.eosdis.nasa.gov) which I would like to view in ArcMap 10.4. It's MOD14 thermal anomalies data. Currently I can place the data on a map, but it ...
178 views

### High resolution SAR for Sea Surface Salinity near coasts (Sentinel 1)

Microwave remote sensing missions such as ESA's SMOS are used to compute variables such as soil moisture and sea surface salinity, using the dielectric constant. This is done on large spatial ...
2k views

### Landsat 8 Collection Level 1 and 2

When I access Earth Explorer, I have the option for downloading images for both Landsat 8 Collection Level-1 and Level-2. For Level-2 I have a brief description that refers to "Surface Reflectance". ...
750 views

### How to download large subsets of USDA NAIP imagery from Box.com?

The US Department of Agriculture’s Geospatial Data Gateway states, ‘As of April 21, 2017 the NAIP datasets are only available through the "NAIP Download" option on the home page and are no longer be ...
336 views

### Estimating biomass in mangroves in google earth engine [closed]

I am working on a project estimating biomass production and carbon storage in mangrove forests. I looked upon examples estimating biomass production using NPP and GPP such as https://mygeoblog.com/...
72 views

### Reducing processing time of multiband satellite images using RSToolbox in R [closed]

I have created a script in R using the RSToolbox and raster packages in R to process multiband images from Landsat 7 and 8. The code works fine and it is giving me the outputs I need; however, due to ...
140 views

### Supervised classification using endmember spectra (using ENVI 5.1)

We are trying to map land cover classes over a small watershed. We have selected training sites (during a field campaign in early 2017) and determined their spectral profiles on a Landsat 8 image ...
449 views

### Open source remote sensing and satellite imagery DATA [closed]

What are the most known libraries of open source data related to remote sensing and satellite imagery? Especially applicated to agriculture? And what are their resolutions and frequencies?
65 views

### SAR Flood Depth Mapping [closed]

Is it possible to map flood depth using sar dataset? if yes Which sar data should be used for better result and using which software we can map?
452 views

### Why Landsat ETM+ panchromatic band' wavelength steps over visible range?

The Landsat ETM+ band-8 (Panchromatic) is identical to Landsat-8 OLI' Panchromatic band-8 in terms of spatial resolution i.e. 15 x 15m cell size. However, there is great difference in the wavelengths ...
623 views

### SNAP vs. GDAL vs. Orfeo - image rescale, histogram cut

I work with a Sentinel-2 .jp2 image (red band, 10950 x 10950 pixels). My aim is to reach the same result what SNAP does with a Python script. See the SNAP method and parameters: So this is my ...
116 views

### arcpy CompositeBands for each folder, name new raster by folder

I am processing multibands remote sensing rasters (i.e. Sentinel data). Each set of bands is stored in individual folder. I would like to list folders and list rasters (bands) in each folder to create ...
47 views

### Orfeo rescale problem?

I have downloaded a Sentinel image, what I histogram matched first with the following Orfeo codes (a cut the low and high 2 percentiles): # Import the otb applications package import otbApplication # ...
934 views

### Sentinel-2 mosaic (RGB bands) to a country

Is there a direct way to download a full coverage, actual (2017), cloudless, mosaic of Sentinel-2 satellite imagery to a whole country (with the size like Portugal) ? If it isn't possible, then can ...
189 views

### Clipping raster layer properties change

I have an NDVI for a very large region, so I clipped it so it would fit my study area. The problem I am encountering however is that when I apply the clipping function the pixels come out differently ...
227 views

### Color matching for satellite images

I have two Landsat 8 satellite images from two different dates in may. When I import them in ArcGIS they slightly overlap but the pixel colours don't match making it hard to run an NDVI. I have been ...
683 views

### Maximum Likelihood and Random Forest Classification [closed]

Which classification is best for Crop mapping? Random Forest or Maximum Likelihood?
76 views

### Running MFmask in MATLAB: Error using imfill

I am trying to create a cloud and cloud shadow masking raster using MFmask (https://www.sciencedirect.com/science/article/pii/S0034425717303073) for a Landsat 8 scene. MFmask 1.1 is modified version ...
2k views

### Export time-series MODIS 16 Day NDVI and EVI Data on Google Earth Engine [duplicate]

I want to extract every single MODIS 16 Day NDVI and EVI Data image on a particular area from 2000 to 2016. I was able to filter image collection but I do not know how to export every single image on ...
37 views

### How to do power law test for DMSP/OLS nighttime Satellite data [closed]

I am working with DMSP/OLS satellite's (6 bit) nighttime light data to study the urban expansion of different cities in South Asia. I could not understand the Power law distribution method. I searched ...
269 views

### Calculating albedo values with landsat 7 ImageCollection/FeatureCollection error in Google Earth Engine?

I am facing a technical difficulty with Google Earth Engine I am trying to retrieve the albedo value of the state of Idaho by using Landsat7 TOA reflectance imagery over the span of a year. ('2005-01-...
391 views

### Are landsat 8 SR and TOA rasters calibrated/corrected data or the data to be used for calibration/correction?

I downloaded Landsat 8 Level-2 scenes from https://espa.cr.usgs.gov/ for land cover classification. Following are the product list in the package, cause I ticked Top of Atmosphere Reflectance (TOA), ...
449 views

### What are the necessary correction/calibration on Landsat 8 imagery for land cover classification? [duplicate]

I downloaded calibrated/corrected Landsat 8 data (Level 2) from ESPA (https://espa.cr.usgs.gov/) to do land cover classification. But there are many corrections and calibrations can be done as listed ...
403 views

### Are Landsat 8 data from ESPA corrected and calibrated?

I am trying to figure out Landsat 8 data corrections and calibrations. Actually, I don't really know how this can be done and which data needs what kind of correction and calibration for further ...
556 views

### Why does my rainbow airplane stripes appearing on Sentinel 2 image?

I have downloaded a Sentinel-2 scene and there are some interesting rainbow like stripes trailing an airplane. This is an rgb image but the stripes are also visible on the other bands. You can tell it ...
83 views

### Is it possible for Orfeo toolbox to do auto object identification on a 3band RGB raster image?

My intention of using Orfeo Toolbox is to find all the open air basketball courts on a raster image with 3 bands RGB. Does OTB require a multi spectral band image or is 3 band image good enough to ...
148 views

### Processing historic aerial imagery mosaics

I'd like to process multiple sets of old (>1938) aerial imagery that are scanned, but whether merged nor georeferenced. While I had good results with QGIS to align single photos, using passpoints, ...
572 views

### Spatial downscaling of MODIS LST grids using a covariate (e.g. NDVI): available software?

I have a MODIS MOD11A2 (LST) grid, which has a spatial resolution of 1000m. For the purpose of Surface Energy Balance modelling, I'm trying to improve the resolution of this data to 250m, using a ...
59 views

### Averaging MODIS 8-day LST for each pixel in a region to generate annual mean LST [duplicate]

I have downloaded 8-day MODIS LST products (MOD11A2) for the whole year of 2011 and is there any method in R to extract those pixels in clear sky conditions with emissivity error < 0.01 and LST ...
47 views

### Classification using hyperspectral or Multi-spectral data

Just want to ask one question regarding the classification using the hyperspectral or Multi-spectral data, If we have hyperspectral or Multi-spectral data, and we only use the data of R G and B ...
362 views

### Multi-temporal Maximum Likelihood classification?

Here is my basic questions. Does it make sense from a theoretical point of view to use the Maximum Likelihood classifier in a multi-temporal dataset of satellite images (Sentinel-2)? I mean, perform a ...