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
387 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
81 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 ...
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0answers
150 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
465 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
68 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?
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2answers
494 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 ...
24
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0answers
758 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
123 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
48 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
1k 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 ...
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1answer
230 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
268 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 ...
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1answer
814 views

Maximum Likelihood and Random Forest Classification [closed]

Which classification is best for Crop mapping? Random Forest or Maximum Likelihood?
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1answer
83 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 ...
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2answers
3k 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
39 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
338 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
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1answer
437 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
492 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
450 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
654 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
89 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
178 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
639 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 ...
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0answers
64 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
50 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
375 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
55 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
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 ...
2
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1answer
438 views

Calculation of fractional cover for each vegetation class at 30-m resolution matching MODIS swath in R

Currently I have a Landsat land cover map with 30-m resolution and I want to calculate the fractional cover for each vegetation class (forests, grasslands and croplands etc.) matching MODIS swath and ...
2
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1answer
1k views

Download AVHRR 1 km SST data

How to download NOAA AVHRR 1 km resolution sea surface temperature data? I need a SST 1 km image of the coast of Netherlands with at least 20 % valid pixels. After searching and searching I find the ...
2
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0answers
30 views

Register an image using mutual information

I want a procedure for registering two images based on their mutual information. I took a pair of georeferenced radar images of the same location, edited the metadata of one so its position was off by ...
4
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1answer
235 views

Does RapidEye level 3A imagery need any kind of preprocessing before applying classification?

I just got some rapideye images and I would like to know if there is need of any preprocessing before applying classification to it? I know that there isn't any automated way of, for example, applying ...
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0answers
160 views

Topographic correction in QGIS SAGA error: Input layers do not have the same grid extent

I have sentinel-2 layer images and one TIN image. I resampled the TIN to same spatial resolution in Layer 4 (10m). Both images are in the same reference system. But when I try to perform topographic ...
2
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1answer
135 views

Surface reflectance product - do I always need it?

There is a neat Surface Reflectance product of Landsat imagery. I know the difference between SR and raw products: SR presents calculated values, that are supposed to represent state of the Earth ...
11
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3answers
4k views

Raw Sentinel 2 jp2 to RGB geotiff

I'm looking for a way to merge Sentinel 2 jp2 band files(B02, B03, B04) and fix RGB colors. All should be done with bash or python script. For my example I work on these images. Ideally the solution ...
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0answers
119 views

Transect profile plot matlab

I have 3D matrix file where XYZ are lon,lat and height. I plot these XYZ value using scatter3. Now I want to plot profile of height (along a line in km) of the data where xaxis:distance along line in ...
4
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1answer
687 views

Landsat / MODIS spatio-temporal fusion: STARFM and software implementations

My main goal is to create Landsat/MODIS image pairs, perform an spatial-temporal fusion which leads to synthetic composites on dates between Landsat acquisition dates. This brought me to the paper ...
2
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2answers
410 views

Missing Landsat TM scenes for the year 2005?

I have searched Landsat TM images (path/row 149/37) for the year 2005 (1st Jan to 31 December 2005) on Glovis, Earth Explorer, Landsat Look and University of Maryland archive to work with. However, no ...
2
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0answers
277 views

Using python spectral package? [closed]

I found this tutorial about spectral using python and I will test kmeans classification using Landsat image. I don't understand some things about this tutorial. First thing I can't understand is about ...
1
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0answers
58 views

Using result raster of Semi-automatic classification to obtain spatial statistics?

I finished classification (use SACP in QGIS), and got a classificated raster. Now I want to obtain characteristics such as sum area of class, areas of different polygons separately, etc. I tried use ...
2
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1answer
2k views

Filter Image Collection by Multiple WRS Path/Rows in Google Earth Engine?

How can I filter an image collection in Google Earth Engine by multiple WRS paths/rows? This is an example of a filter using one path.row: var sr2011 = ee.ImageCollection('LANDSAT/LT5_SR') ....
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0answers
54 views

Loading MOPITT data into QGIS?

I have a problem importing Terra MOPITT data into QGIS (2.18) correctly. The data is in hdf5(HDFEOS) format. QGIS/GDAL imports the data, but the image is rotated by 90° and shifted. QGIS error: CRS ...
0
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2answers
642 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 ...
1
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1answer
54 views

Satellite image of agriculture land cover for some country [closed]

I am looking for a free satellite image of agriculture land cover for North Korea. Can someone guide me to any free resource. Is it available on earth Explorer, if yes, which image should I download....
1
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1answer
300 views

Landsat level-2 NDVI valid range with saturation

I have Landsat level-2 NDVI tiles I am using in ArcMap 10.4.1.; however, the level-2 NDVI data in ArcMap ranges from -5,189 to +20,000. The spectral image product guide (which I've linked) says that ...
2
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0answers
52 views

Is there an arXiv-like electronic archive used by the remote sensing community?

Mathematicians, physicists, and (theoretical) computer scientists use arXiv extensively to share their preprints. Indeed, one could say that it's the established way to share one's research. Is there ...
4
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5answers
2k views

Simple way to collect the Sentinel data of a given ROI?

If you wanted to collect all Sentinel satellite data for a given region of interest (ROI), say, for a given day or time frame - is there any simple way to do it? That means: Without having to download ...
-1
votes
1answer
499 views

Photomosaic non-georefferenced images using open-source software

I have a directory of images that were captured by drone. The images have GPS info in the EXIF tags but are not georefferenced and do not have world files. I would like to merge these photos into a ...
2
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0answers
170 views

ENVI shows colors of different RGB code the same in a bitmap image wrongly?

As you see in this picture which I've captured in MATLAB, there are two colors. Red with the RGB code (255,0,0) Brown with the RGB code (138,139,1) I've tried to show the same picture in ENVI, ...

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