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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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2
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0answers
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,...
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1answer
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 ...
2
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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 ...
2
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1answer
1k views

Calculate MSAVI (Modified Soil-adjusted Vegetation Index) in Google Earth Engine

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 ...
3
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2answers
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 ...
-1
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1answer
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:...
1
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1answer
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, ...
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1answer
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 ...
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0answers
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 ...
1
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1answer
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 ...
1
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1answer
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 ...
-1
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1answer
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.
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4answers
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 ...
2
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1answer
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 ...
2
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1answer
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 ...
0
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1answer
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 ...
2
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1answer
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??
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2answers
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 ...
1
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1answer
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 ...
2
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1answer
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". ...
7
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2answers
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 ...
2
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0answers
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/...
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0answers
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 ...
2
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0answers
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 ...
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1answer
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?
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1answer
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?
10
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2answers
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 ...
22
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0answers
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 ...
2
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2answers
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 ...
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0answers
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 # ...
3
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1answer
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 ...
0
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1answer
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 ...
1
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1answer
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 ...
0
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1answer
683 views

Maximum Likelihood and Random Forest Classification [closed]

Which classification is best for Crop mapping? Random Forest or Maximum Likelihood?
0
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1answer
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 ...
0
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2answers
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 ...
2
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0answers
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 ...
1
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1answer
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-...
2
votes
1answer
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), ...
0
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1answer
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 ...
2
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2answers
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 ...
16
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3answers
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 ...
1
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1answer
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 ...
1
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1answer
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, ...
2
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2answers
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 ...
0
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0answers
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 ...
1
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1answer
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 ...
3
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1answer
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 ...
0
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1answer
54 views

Seeking software to pick up rectangular shape of basketball courts?

Is there any software/plugins for remote sensing or object orientated classification for my 3 band aerial image? I want the program to be able to pick up open air basketball courts or badminton courts ...
0
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1answer
84 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 ...