Questions tagged [landsat-8]
Use this tag when asking question related to the 8th satellite in the Landsat program.
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5 views
SAGA Topographic correction process will not change original
I am having a problem with processing a file with the "SAGA Topographic Correction" function. I have watch countless videos to see how other users set their parameters and I have had no luck.
I ...
0
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1answer
46 views
How to see previous years' satellite imagery on GEE?
I have a set of points for which I want to see what built up or non-built areas were around these points in 2014, 2015, 2017 and 2018. When I lay these points (in yellow) on the default satellite ...
1
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1answer
49 views
Smoothing/interpolating across images in an ImageCollection to remove missing data
I have some code that is working properly to calculate the monthly NDVI averages for the previous two years from a date but I sometimes have missing data in some of the months and I would like to get ...
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0answers
50 views
Landsat bands have negative values
I have downloaded Landsat 8 OLI TIRS collection 1 level 2 data. I know that Level2 has been converted from DNs to TOA reflectance already. However, when I open it in ArcMap, Band 1 and 2 have values ...
4
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2answers
65 views
Can't get Landsat-8 images after 2017-06-01 in Google Earth Engine Python
Using the Google Earth Engine Python API, I can get a Landsat-8 TOA image for anytime before 2017-06-01 but not for any dates after that.
Getting a Landsat-8 TOA image for before 2017-06-01:
from ...
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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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1answer
32 views
Didn't show all the column while export the CSV file while using Google Earth Engine
I'm trying to calculate the water areas and the statistics of each band for each water areas to see if there are seasonal changes.
The exported .csv file only have the columns ("GNIS_ID","AreaSqKm","...
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1answer
94 views
Using GDALwarp for reprojecting netCDF file?
I am trying to re-project a netCDF file using the gdalwarp command. However, the gdalwarp is giving me a black output.
Below is my code:
import gdal
import osr
import netCDF4
from osgeo.gdalconst ...
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0answers
27 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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2answers
51 views
Pansharpening Landsat 8 16 bit raster images
Situation:
I have merged six Landsat 8 image tiles to one big tile for the bands 4,3 and 2. These are Landsat level 2 products, so already corrected to surface reflectance and need no further ...
2
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2answers
132 views
Landsat 8 - Reflectance Values
I downloaded some Landsat 8 OLI/TIRS C1 Level-1 images from EarthExplorer. I was hoping to get reflectance data out of the blue, green and red band; however, when I opened those images in ArcMap, the ...
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0answers
71 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 ...
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2answers
55 views
Google Earth Engine exported image looks different from map rendered on screen
I am creating a composite image of Landsat 8 OLI of Okinawa and want to export the true color image to my google drive as a tif file. I was able to successfully download it, but the image (img2) looks ...
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0answers
30 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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1answer
52 views
Landsat 8 Level 2 products. Converting Pan & Thermal bands to spectral reflectance
We have downloaded around 20 Landsat Level 2 Surface Reflectance scenes for our AoI. The processed bands available in the downloaded scenes are, as you people know - Aerosol,B,G,R,NIR,SWIR,Cirrus.
...
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0answers
21 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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1answer
324 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 ...
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1answer
23 views
Integrating Landsat ETM+ and OLI surface reflectance data
I want to do a time-series analysis on Landsat surface reflectance data for an extended period of time (2005-2018), which requires integration of Landsat 5, 7, and 8. Is there any procedure to make ...
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1answer
28 views
How can I set multiple values to null in one raster and replace all other values with another raster?
I am working with Landsat8 cloud data (BQA.tiff). I would like to set all medium and high confidence cloud/cloud shadow values (values listed below) to null and replace all other values in this image ...
2
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1answer
177 views
Filter Specific dates in Google Earth Engine?
I've called Landsat8 images from 2014 to 2019 using filter date function. But I don't know how can I call Landsat8 images only for June, July, and August from 2014 to 2019?
Map.centerObject(geometry);...
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1answer
41 views
gdal nearblack increases file size. Is this expected behaviour?
I ran gdal - nearblack on a Landsatlook image with geographic reference as follows:
nearblack -o c:\test\test_nearblack.TIF -of GTiff c:\test\LC08_L1TP_179044_20181228_20181228_01_RT.tif
The input ...
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1answer
55 views
i.atcorr [GRASS] - has anyone used it and actually had success?
I am trying to apply i.atcorr to a landsat mosaic with GRASS. These are my 6S parameters:
18
01 31 22.10 178.940 -17.263
1
1
0
0.115
-0.270
-1000
116
Everytime I run it, it returns me a raster ...
2
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1answer
80 views
How to de-stripe a Landsat 8 band with python?
I am working with Landsat 8 images and some of the bands have striping, e.g.:
I've been going down a rabbit hole by looking for a solution for this. Does anyone know a python library that could be ...
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0answers
55 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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1answer
88 views
Pansharpening many L8 images in folder?
I want to pansharpen several true color and panchromatic Landsat-8 images in a folder using open source tools (GDAL, Python). File names are of format:
L8_2018-09-25T18-17-51_TrueColor_ERaymond.tiff
...
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2answers
71 views
Do I need to do Radiometric Normalization for time series analysis, if I'm using L2_Landsat8_SR data?
I'm doing some forest change detection across several years using L2_Landsat8 Surface Reflectance data. And I am implementing the method available in R (landsat::relnorm) for relative radiometric ...
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0answers
198 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....
0
votes
1answer
59 views
ENVI 5.1 - ANN Classification - Background was classified into one of the class
I'm new to Remote Sensing and I'm having trouble in ENVI 5.1 where the background was classified as one of the classes in the ROI I used, which is not right. How can I exclude the background or at ...
0
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1answer
96 views
What's the time zone of the timestamp of LANDSAT Images?
I am using google earth engine just to print the timestamp here of LANDSAT Image. I am using the geometry of a part of Chennai which is in India.
// Filtering Data with Date and Geometry
var Data2 = ...
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1answer
51 views
Using Google Earth Engine to filter Landsat Daytime image?
How do I filter Landsat imageCollection by their time of collection?
For example, if they are daytime or nighttime, which might be specified as Ascending or Descending.
I don't know which metadata ...
0
votes
1answer
168 views
Google-Earth-Engine + Jupyter : filterBounds not working in Landsat imageCollection
I have a simple problem of not being able to select a single Landsat image using filterBounds within Jupyter environment. It used to work just fine in Earth Engine's online interface. I don't know why ...
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1answer
39 views
Mapping a function over a Collection
I would like to calculate a MSI index for the each image of the collection and I developed below presented script. But, somehow it is not working and it says "midir.divade is not a function". Can ...
1
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1answer
143 views
Function to convert Dictionary to Image works for an image but not for an image collection
I have written a small function that first takes an image, calculates mean for each of its bands and then converts the dictionary of the mean value to an image with each mean value acting as a new ...
2
votes
1answer
924 views
Exporting entire ImageCollection in Google Earth Engine using geetools for JavaScript or Python for Windows?
I am very new to ee and am trying to export a collection to my drive, after masking for clouds and clipping to myregion... tried to follow the advice in this answer https://stackoverflow.com/questions/...
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0answers
42 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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1answer
464 views
GEE. : Exported bands must have compatible data types; found inconsistent types: UInt16 and UInt32
What are the possible reasons for this error?
This is the code:
Map.addLayer(PuntoQuellaveco1);
Map.addLayer(operaciones);
Map.addLayer(Abast);
var image = ee.ImageCollection('COPERNICUS/S2')
....
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0answers
30 views
Extract the county (or village) level data of forest cover change from Google earth engine [closed]
I am currently working with the Hansen data (Global Forest Change) in Earth Engine. And I would like to extract the county (or village) level data of forest cover change in China from Google earth ...
1
vote
1answer
577 views
Estimating Land Surface Temp Using GEET
I am using google earth engine toolbox to estimate land surface temp for landsat 8 imagery. I have been able to run all the necessary calculation without error but when I add the band as a layer all ...
0
votes
1answer
276 views
GEE unsupervised classification (clustering) of Landsat 8 cloud free composite - User memory limit exceeded
Can anyone explain why I am getting the memory limit error when trying to classify using the wekaKMeans algorithm over a cloud-free composite of Bangladesh? I'm trying to differentiate mangrove pixels....
2
votes
0answers
117 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 ...
0
votes
1answer
191 views
How to load Landsat imagery over ROI defined as a polygon rather than a point? GEE
In google earth explorer you can load Landsat image around a roi. You can then conduct analysis on this image. I want to expand my region to cover a whole country or continent rather than just the ...
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vote
2answers
375 views
Getting RGB values of each pixel in a LANDSAT 8 GeoTIFF with Python 3
I'm working with a set of LANDSAT 8 Collection 1 Tier 1 GeoTIFFS pulled from Google Earth Engine, and I need to find the RGB values of every pixel in this GeoTIFF.
I've tried using the code from ...
0
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1answer
402 views
Classification of buildings using USGS Landsat 8 images on Google Earth Engine
I am trying to classify built-up and non-built-up areas in the district of Ambala in India within the time period 2014-17 using a simple classifier model I had created.
The model uses 20,000 points ...
2
votes
1answer
305 views
Why Landsat images are tilted/rotated?
When I browse images from https://earthexplorer.usgs.gov/, I can see that all of the images from Landsat are all tilted/rotated at a certain angle.
Why are they rotated? And what's that for?
Below ...
3
votes
1answer
162 views
Why vegetation index, NDVI or SAVI is not working in the desert?
Could anyone explain why the vegetation indices are not working in the desert region?
I used Landsat 8 image which has been already radiometric/atmospheric corrected.
I want to see the fractional ...
0
votes
1answer
212 views
Radiometric, reflectance and atmospheric correction for Landsat 8 image
I am struggling with the pre-processing process for landsat8 imagery.
I want to use some indices (e.g. NDVI, SAVI, EVI, NDMI) and create a land cover map at the end using ENVI and ArcGIS.
As a ...
1
vote
2answers
38 views
Efficient way to check sample points on many Landsat scenes?
I want to do an accuracy assessment for an annual burned area map (large area - whole country). I have random sampling points which I need to check in simple burned - not burned categories but ...
1
vote
1answer
212 views
conditional statements for raster in R - land surface temperature
Im trying to calculate Land surface temperature estimating with Landsat 8 images, but i got stuck in one place and i cant move on. I m following split window algorithm. I calculated NDVI and I have ...
0
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1answer
87 views
Satellite image in ArcGIS darker than usual
This is one image from 2013 in some área.
This is another image from 2014 in the same área, but darker. why? How can I display it like in 2013.
Both are Landsat 8 images.
3
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2answers
79 views
Computing NDVI in ArcMap from Landsat 8 “Analysis-Ready” Surface and TOA Reflectance Products
The internet is full of various contradictory advice on corrections one can make to get NDVI computed from Landsat 8 to fall between -1 and 1.
This is for instructional purposes, so I hope to use ...
