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Questions tagged [landsat-8]

Use this tag when asking question related to the 8th satellite in the Landsat program.

4
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0answers
310 views

Improve washed out blurry composite Landsat 8 image in QGIS

I want to create a composite image using Landsat 8 bands. I followed the steps to do so (creation of virtual layer, high resolution, separate) and adjusted the bands' colors (red 4; green 3; blue 2) ...
4
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0answers
209 views

Disable readdir on open in gdal_translate when using /vsicurl/

I'm using /vsicurl/ file handler to read Landsat 8 data out of S3. Following GDAL documentation "to minimize the total number of HTTP requests outside of the target GeoTIFF file" I set ...
4
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0answers
496 views

How to remove black pixels in Landsat image

Does anyone know how I can remove these black pixels around the edge of this Landsat image? They appeared when I layer-stacked the bands in ERDAS IMAGINE - they were not there in the separate band ...
3
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0answers
442 views

Remove near black borders on Landsat 8 overview images

I want to eliminate near black pixels around edges of Landsat-8 overview. I'm interested in doing it not for the entire image but some extent, so I clipped it. I tried using GDAL nearblack utility, ...
3
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0answers
405 views

Image classification for a study site falling over two adjacent Landsat 8 scenes (qGIS or ArcGIS)

This question concerns work-flow rather than specific methodological problems. I will be using GRASS to classify Landsat 8 images to create a vegetation map for a study site that happens to fall over ...
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0answers
105 views

Calculating indices such as NDVI or NDSI on Landsat 8 imagery whose pixel type is 16 bit signed integer?

I am trying to calculate an NDSI (Normalized Difference Snow Index) using Landsat 8 OLI level 1 imagery atmospherically corrected in ERDAS ATCOR using raster calculator in ArcMap. NDSI is used to to ...
2
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0answers
71 views

Why don't Landsat 8 image extents match WRS2 polygons?

The question doesn't need too many explanations, but the following picture illustrate the problem very well. I sort of understand why they don't match on width. The satellite drifts away of its path ...
2
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0answers
187 views

Computing stats with data ignore values - ENVI classic

I'm using ENVI classic (5.4.1) and trying to compute basic statistics from a Landsat-8 scene. When I mask out certain pixels (water set to 'No Data', for instance) the built-in ENVI statistics still ...
2
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0answers
188 views

ESPA-API for Landsat scene downloads

I've been trying to automatically download Landsat scenes with espa-api ( https://github.com/USGS-EROS/espa-api) However I'm having a big issue with this api right now, that is the long waiting time ...
2
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0answers
172 views

i.atcorr - Landsat 8

I am trying to apply atmospheric correction to Landsat 8 scenes using i.atcorr. After tons of tests I am still struggling with the correct input and output range. The results deriving from radiance as ...
2
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0answers
38 views

minimum number of pixel points for regression on atmospherically corrected satellite images

I am performing atmospheric correction on a Landsat 8 image using different methods to check which one works best (in order to proceed with further/subsequent analysis). Wondering if it's okay to use ...
2
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0answers
125 views

Layer Stack 6 Landsat8 bands

I have 6 images from Landsat 8 (Green,Red,NIR,SWIR1,SWIR2,NDVI). When I want to layerstack them with "Merge" I always get a result tif which is just black and white, however I can see that all 6 bands ...
2
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0answers
356 views

Right Orfeo Toolbox Segmentation input

I made this tutorial. I used Landsat 8 bands (1-7), which I atmospheric corrected with DOS and converted to 8-bit. After that I layer stacked the pre processed band (1-7), clipped a little part with a ...
2
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0answers
1k views

Resample Landsat 8 to 60m Resolution

I have two Landsat images for the same study area. One of them in 1975 (Landsat 2 MSS with 60m resolution) and the other in 2014 (Landsat8 OLI with 30m resolution). I want to do change detection ...
1
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0answers
19 views

Surface Temperature + Air Temperature in Landsat image comparisons

Quick question about relating Landsat Surface Temperature to locally recorded Air Temperature on a given day: Are differences in local air temperature captured by the Landsat ARD ST imaging process? ...
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0answers
26 views

Removing pixels in band using an inequality in Google Earth Engine?

My current code: https://code.earthengine.google.com/5ff735e22e894a6c1b5ddc628cfccae7 I have an inequality from line 99-106. I want this inequality to assign a value of 1 to all pixels that satisfy ...
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0answers
17 views

Landsat 8 cloud band: how to understand their (bit) coding?

I am trying to understand how to use the Lansdat 8 cloud quality band. The user guide L8_Surface-Reflectance-Code-LASRC-Product-Guide.pdf does not explain much, but just gives tables (Table 7-1, 7-2 ...
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0answers
148 views

Normalizing negative pixel values in a GeoTIFF with GDAL in Python

I have a GeoTIFF pulled from Google Earth Engine. I'm using the following code to see the red values of each pixel: from osgeo import gdal gdal.UseExceptions() ds = gdal.Open(myfile) band = ds....
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0answers
41 views

Get a large area landsat 8 metadata from earth-engine

Obviously the code below will returned null because there's no picture in landsat 8 will contain such a large area. #python geometry = ee.Geometry.Polygon( [[73.0, 25.0], [73.0, 49.0], ...
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0answers
178 views

Centroid latitude/longitudes of Landsat pixels

I was successful in getting centroid coordinates for pixels in Sentinel 2A image (10m by 10m). But Landsat (30m by 30 m) posed a problem. from osgeo import gdal # Open tif file ds = gdal.Open('C:\\...
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0answers
182 views

How to preprocess and remove noisy data from Landsat-8 image Bands for ndvi time-series analysis

I'm working on satellite image processing, I'm calculating NDVI for time series analysis and vegetation prediction. I'm having a tough time removing the noisy data like, Cloud coverage Haze Cloud ...
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0answers
109 views

RS&GIS plugin produces no outputs

I'm trying to look at some landsat images and thought I would give the RS&GIS a go, as a way of creating true and false colour composites. I'd like to visually inspect the vegetation my project ...
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0answers
47 views

Is there any specific index for identifiying settlements in remote areas through Landsat or Sentinel images?

I am trying to identify (especially) small settlements in Nigeria that have no electrification. So is there any index that could help me detect households from Landsat or Sentinel images?
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0answers
185 views

Extracting data from satellite tiff file in .nc format?

I'm working with Landsat-8 satellite images and sometimes I need to open real values (numbers) for example as a simple excel table (or similar). These my steps for getting TOA reflection in QGIS: ...
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0answers
482 views

How to export image on google earth engine for large area?

The area that i have been work have about 159695,938 km² and I am mapping the deforestion on this with NDVI. I had to use 2 years to remove all the clouds (eg. 2015-01-31 , 2016-12-31) using a reducer....
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0answers
227 views

Error in GRASS i.pansharpen - No images are generated

I´m trying to run the algorithm "i.pansharpen" in QGIS 2.18.8 , Win. 7_64bit. I´ve tried with rasters (Landsat 8 images) in 8bit and 16 bit unsigned and differents methods (brovey and IHS) but i ...
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0answers
20 views

Finding Land Surface Temperature in across 4 continuous images in ArcGIS 10

I'm trying to find Land Surface Temperature of 4 continuous Landsat8 images in ArcGIS. I was able to calculate them as individual panels (using these two videos as guidelines: https://www.youtube.com/...
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0answers
59 views

RGB Image Metadata

How to extract metadata of landsat-8 multi spectral image.(RGB Formation). I have processed the image, taken out RGB Bands, cropped it and now want the metadata of the combined stack/brick. Using ...
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0answers
207 views

Landsat 8 mosaic

When I tried to mosaic two Landsat-8 images in ARC GIS 10.4, I found overlaps area after mosaic and it appears as sharp line and it looks like two images with different colors. I want to make them as ...
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0answers
95 views

view zenith angle of MODIS surface reflectance product and Landsat 8

I have a MODIS daily surface reflectance product (MYD09GA) which I'd like to validate Landsat 8 image with. I want to obtain pixels that only fall within the view zenith angle of Landsat 8 ( 0 - 7.5). ...
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0answers
230 views

Process Landsat8 data in AWS S3 from EC2 instance

I'm wondering what is the best way of processing huge amounts of Landsat8 images stored in the AWS S3 buckets from an Ec2 instance located in the same availability zone. Should I download the scenes ...
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0answers
177 views

Why are Landsat-8 derived NDVI values higher than SAVI values?

I have calculated NDVI and SAVI vegetation indices for a landsat-8 image. I am unexpectedly getting higher values for the NDVI than SAVI. What may be causing these unusual results? NDVI=0.46 SAVI=0....
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0answers
241 views

Enhancing/smoothing Landsat 8 image using ArcGIS Online?

I understand that Landsat 8 is 30m resolution, but is there any technique that can be used to smooth/enhance the NDVI or Agriculture Landsat layers in an ArcGIS Online (AGOL) web map? I have adjusted ...
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0answers
350 views

Pansharpening Landsat 8 tiles in Grass 7

I am trying to get some nice looking RGB images for visualization purposes, mainly using as background maps, from the Landsat 8 archive. I was following the tutorial provided by Markus Neteler at ...
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0answers
613 views

Asking linear regression between NDVI and LST using ENVI

Here I have a problem to calculate a linear regression. I Have two images of NDVI and LST derived from Landsat 8 and want to calculate the linear regression for between them obtaining the dry edge and ...
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0answers
143 views

How to SELECT one day's scene (Landsat 8 scenes)

I have a huge dataset of raster in PostGIS. Each scene is divided into tiles (tile-size 500x500). I was trying to SELECT rast FROM landsat8 WHERE ST_Intersects(rast, polygon). It runs very slow, ...
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0answers
254 views

How to use USGS Bulk Download on EC2 linux Server?

I am interesting in downloading Landsat 8 rasters to an Amazon EC2 instance and would like to know how to do it. I already install USGS Bulk Download but I do not know how to use it in terminal mode (...
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0answers
12 views

Eliminating superfluous raster values using ArcMap?

I have used the raster calculator in ArcMap to calculate the salinity index (RED-NIR/RED+NIR Khan et al.) over a portion of land which was disturbed by the construction of a solar farm. Landsat 8 ...
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0answers
28 views

Deriving temperature from Landsat (Google Earth Engine)

I've been editting a script to make a time series chart of the temperature. (Original script: https://code.earthengine.google.com/2b2c4e1ece6ac2a201f8e854c34cd577 ) The issue is that I don't know what ...
0
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0answers
117 views

Calculating LST from Landsat 8 in Google Earth Engine?

I'm trying to write a code for Land Surface Temperature (LST) from Landsat 8 images in google earth engine. I'm using the code of this question as a guide and I succeeded at intermediate steps but I ...
0
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0answers
47 views

Google Earth Engine pull least cloudy Landsat scene by location using conditional

My goal is to write code that will pull all Landsat 8 scenes available for a given month in a given year for the US, add a cloud score band to each image, and if there are multiple images for the same ...
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0answers
38 views

Set multiple values to nodata - Erdas Imagine 2015

I am having trouble with the data ranges in the Landsat 8 surface reflectance product which I downloaded from USGS. The Lansat 8 surface reflectance handbook says the valid range is 0 - 10,000 range ...
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0answers
491 views

GEE Landsat SR year composite // mask cloud / shadow out w/ other method than quality pixel

Has anyone found a good solution to mask out cloud/shadow cover not using quality assessesment pixels or combining it with something else? I am trying to generate cloud/shadow free composite for a ...
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0answers
37 views

Calculating the mean between several raster layers, with NoData values

I have several Landsat 8 scenes from which i have derived the surface temperature. To obtain an average, I would like to generate the mean between all my scenes. However, prior to this I am planing to ...
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0answers
166 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 ...
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0answers
289 views

Landsat 8 bands of 432 looks too dark in ArcGIS

I have created a composite map using the combination of Landsat 8 bands of 4, 3 and 2 (I read this combination gives true natural color) to see the scene in true color in ArcGIS, but it looks too dark....
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0answers
21 views

What is the efficient way to find the top-most images of a Landsat-8 mosaic with latest data on top?

I'm building a simple mosaic of Landsat-8 for a region of interest (a bounding box) for a time period, so that the latest data would be put on top of the mosaic. I've found 100 scenes with cloud cover ...
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0answers
107 views

How to georeference different time layers of Landsat 8 for a target area?

The issue is that my target area from different days doesn't overlap each other. When I use UTM coordinates to reference instead of Lat-Lon values, the results are even worse. Here I describe my ...
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0answers
75 views

Reprojecting shapefile to raster projection

I need to rasterize my shapefile. This can only happen if both raster and shapefile are in same projection. I don't know if they are in same projection. How do I compare the projection of these two ...
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0answers
84 views

Building raster attributes?

I have created an NDVI Image using bands 4 & 5 of landsat-8, now I wanted to see the attributes and do some more analysis but can't see the attribute. I have tried to convert the image from ...