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Questions tagged [landsat]

A series of Earth-observing satellite missions jointly managed by NASA and the U.S. Geological Survey.

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21 views

Make Level-2 Landsat images comparable with Level-2A Sentinel-2 images

Is there a way to make Level-2 Landsat images (e.g. Landsat-5 images ordered from EarthExplorer) comparable with Level-2A Sentinel-2 images? The objective is to calculate water or vegetation indices (...
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12 views

Quantifying level of urbanization of catchment over time?

I am studying the impact of urbanization on the discharge levels of a river during flooding events. For this, I need to determine the catchment's percent urbanized area through land classification ...
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41 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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27 views

Landsat 8 Mosaic (NDVI) Overlapping?

I have downloaded 3 satellite images (Landsat 8 OLI TC1P), in three different periods (two images are from Mart 4. 2017. and the one is from Mart 20. 2017). I have joined (made mosaic) them in ENVI ...
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39 views

Surface area calculation in Google Earth Engine?

Using this code, I've extracted water extent in a Landsat median image. But how can I compute water area extent? code link: https://code.earthengine.google.com/8ad84d9ca59b3cb71b62f83119621bdc var ...
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15 views

Download QA band of Landsat 1-8

In one of my work, I just need the QA band of Landsat, but USGS Earth Explorer does not provide band by band data download opportunity. As I am interested to get all the available Landsat QA data from ...
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28 views

Creating decision rules on pixel level in time series layer in R? [closed]

I am using Landsat 5, 7, 8 images and RStudio. My goal is to compute the disturbance in a given area using the Vegetation Change Tracker (VCT) algorithm. I would like to ask you if you could provide ...
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22 views

Retrieving Landsat cloud percentage without downloading the data

Is there any way to get the cloud percentage information from metadata of Landsat data without downloading it? I would like a Python solution if one is available.
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83 views

QGIS 3.2 Quick Map Services Plugin not Showing Basemaps

For some reason my landsat imagery through QuickMapServices is not showing up. I set the CRS to Albers Equal Area NAD 5070. It does say "Getting Tiles", so I'm not sure if it just takes hours to load? ...
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27 views

Why is {maxPixels : } set to 1024 for MODIS and 80 for Landsat?

I am currently trying to understand how images are resampled and reprojected in google earth engine and I came across this tutorial: https://developers.google.com/earth-engine/resample Why is ...
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44 views

Merging several .hgt files into one

I'm currently struggling on trying to combine several .hgt files with different software. I can get the 4 tiles into any kind of software but my issue is exporting the file back to .hgt file. I've ...
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1answer
61 views

Perform Radiometric Correction of Landsat images using ArcGIS Desktop

I need to run NDVI on a study area that is covered by more than one Landsat image. The NDVI must also be run over numerous years using different Landsat sensors (eg: Landsat 7 Level 1, Landsat 4-5 ...
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28 views

Calculate cloud free median value for landsat 5, 7, 8 image collections in GoogleEarthEngine

I have an image collection of Landsat 5, Landsat 7 and Landsat 8 images. I want to calculate the median value of my image collection. Before that I want to exclude all cloudy pixels of my collection, ...
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19 views

Higest-resolution daily temperature products?

I'm looking to collect daily temperatures for a very small geographic area, and as such am in need of some high-resolution products. I have used MODIS, but the data comes with a 1km resolution. Are ...
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32 views

Apparent disappearance of NLCD 1992/2001 retrofit land cover change product

I am attempting to download the national land cover datasets 1992-2001 retrofit land cover change product from the mrlc site. The product exists throughout documentation and I have not found any thing ...
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1answer
42 views

Centroid value extraction of Landsat image collection in Google Earth Engine

I have an NDVI collection wich I have created from the combination of different collections Landsat5 and 7. How can I exctract the NDVI values of the centroids of each pixel, of each image from my ...
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1answer
45 views

NDVI over time (30 years)

I am trying to calculate an NDVI over time (say, the span of 30 years) for a certain area of the United States. I think it's possible with Landsat 5,7, and 8 together. The goal is to understand change ...
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1answer
62 views

Pixel-based calculation of valid observations in Landsat ImageCollection

I am trying to calculate an ee.Image() object that contains the number of valid (= unmasked) pixels of a given Landsat ImageCollection. Originally I thought a simple ee.ImageColllection.count() would ...
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1answer
87 views

Selecting Landsat bands to download from Google Earth Engine?

I am trying to download a specific Landsat scene (since the USGS EROS site is down from the government shutdown) using the imageToCOGeoTiff task to save to my Google Drive. I am using the USGS Landsat ...
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1answer
39 views

Earth Engine export scale interpretation

I'm exporting a Landsat RGB image from Earth Engine. I want to use the full native resolution (30-m pixels) in the output file. However, it seems that using 30 in the scale argument fails to export at ...
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60 views

Loading Landsat 8 tiles into QGIS?

I have 65 Landsat 8 tiles I download off of EarthViewer form the USGS website. What is the fastest way I can load these files into QGIS? My issue is that each tile I downloaded came with a folder ...
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59 views

Supervised classification with only one class with Google Earth Engine

I am a beginner with geospatial analysis and Google Earth Engine. I am trying to classify only one class of Landsat 5 image (swimming pool). I got several training sites and applied the classifier. As ...
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2answers
48 views

Relative Radiometric Normalization of multisensor Landsat Level 2 images using R

For my time series analysis, i need to use images of the three Landsat sensors (TM, ETM+ and OLI). I chose the already atmospheric corrected surface reflectance/Level-2 products. Due to the ...
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1answer
106 views

Filter Landsat Images - cloud cover

I'm trying to filter Landsat images based on the percent of cloud cover for my ROI. I have tried to adapt code in link one and link two but cannot get what I want. My ROI has been imported as a ...
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2answers
46 views

Why does the Extent of NIR Band 8 Landsat image not match other bands, even when cropping to a specified extent?

I'm trying to load and then stack four bands 2,3,4 and 8 RGB and NIR from Landsat images. I have downloaded and extracted them and they are in .tif format. # loading the bands B2 <- raster("./...
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1answer
46 views

How to make calculations with Landsat datasets in Google Earth Engine?

I'm looking to transform my Landsat data-sets to correct for differences in sensors between missions The mathematical function I am hoping to apply is- NDVIL8 = 0.0235 + 0.9723 * NDVIL5,7 But I ...
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1answer
33 views

Appropriate resolution for regression analysis

I'm using ArcMap 10.3. I'm a student working on a research problem where I'm taking Landsat imagery (at 30-meters resolution) and regressing it against other datasets captured at different scales (up ...
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32 views

Pre-Processing for multi-sensor Time series analyses based on Landsat Level 2 imagery

I downloaded TM, ETM+ and OLI Surface Reflectance Higher-Level Data Products (atmospheric corrected) based on L1TP Landsat images (radiometrically calibrated, orthorectified). I need to include images ...
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1answer
61 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
80 views

Earth Engine chart image series by region tripped up by geometry

ui.Chart.image seems to get tripped up by Landsat data. I've encountered the same error using Landsat 5, 7, and 8 and with several shapefiles so I'm confident it isn't a problem with the regions I'm ...
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1answer
47 views

Get a list of all the images that match the conditions in Google Earth Engine (not only the first)?

Normally when I run this code I get the least cloudy image but I want to know what the other images are. I use this code: var image = ee.ImageCollection('COPERNICUS/S2') .filterBounds(...
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How do I fill Landsat 7 SLC gaps using QGIS?

I am currently using the QGIS 3.4.0 Raster -> Analysis -> Fill nodata (a tool for Landsat 7 data). I am using the directly downloaded USGS tiff band files with corresponding gap mask band tiffs ...
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63 views

Crop a raster layer given lat/lon ranges in QGIS 3.2?

I uploaded a landsat raster layer in QGIS 3.2 and I need to crop it. I noticed that for every pixel QGIS knows the lat/lon value (as expected). Since each pixel has its associated lat/lon coordinate, ...
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1answer
230 views

Search images in USGS earth explorer using Python API

Is it possible to search for images in USGS Earth Explorer using Python (API) script? I tried the example here: from usgs import api # Set the EarthExplorer catalog node = 'EE'# this indicates ...
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1answer
22 views

Radiance Calculation of Landsat 7 with Google Earth Engine(search for gain and bias)

I need to calculate the Radiance of Landsat 7 in GEE I read in Data Users Handbook under 5.6.5 how to do this. Here it says, these Values are accessible in the Metadata. Now I am searching the ...
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1answer
52 views

How to determine the right time of Landsat 8?

Sorry, please help me clarify this issue. Assume that I have information from a Landsat 8 image with the time shown as below: Start time: 2018:288:03:13:25.1532590 Stop time: 2018:288:03:13:56....
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51 views

Classification based on NDVI values of two images

I want to find the areas where the NDVI value were higher then 0.4 at the end of April and NDVI values were lower then 0.3 at the end of June. I have tried to make it using below demonstrated script, ...
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1answer
52 views

What's is the difference between slicing and stacking in a time-series analysis?

My adviser told me that there are two categories of time-series in remote sensing: slicing and stacking. What is the difference between time-series stacking and slicing pertaining to landcover ...
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2answers
251 views

Pansharpen landsat mosaic in Google Earth Engine

Does anyone have a good way to pansharpen an entire mosaic of landsat 8 images? I would use the Panchromatic band (band 8). I have found tutorials on how to pansharpen a single image, but not for a ...
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1answer
68 views

Poor Landsat 5 coverage in Google Earth Engine

I am analyzing Landsat data around Lagos, Nigeria going back to 1990 which includes Landsat 8, 7, and 5. I am using Google Earth Engine's code editor to access and clean the images. I am trying to get ...
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98 views

How to interpolate Landsat missing values after exlcuding cloud masks in google earth engine?

I want to generate the annual mean NDVI from Landsat in Google Earth Engine. However, after excluding bad observations caused by clouds and shadows, the mean composite of remaining Landsat data will ...
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0answers
31 views

Landsat util error when downloading data

I am having trouble when trying to download data using Landsat util. Using the following command: landsat download LC81710792016253LGN01 I get the following issue: landsat download ...
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1answer
115 views

What does percentile mean in simpleComposite of Google Earth Engine?

I was using 'ee.Algorithms.Landsat.simpleComposite' to composite images, but I'm not sure what does this 'percentile' parameter mean?
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1answer
52 views

Mosaic Landsat Scenes for NDVI Generation

I would Like to generate an NDVI map for my study region, which is positioned between three Landsat scenes. Which method suits: 1) compute NDVI for each Landsat scenes and then mosaic or 2) Mosaic ...
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1answer
211 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 ...
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66 views

Vegetation height estimation with QGIS

Is it possible to estimate vegetation ( crops) height using free of charge satellites, like sentinel or Landsat, with QGIS?
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1answer
393 views

Are there high resolution images available for download on earthexplorer?

The problem with earth explorer GeoTiff files is, if you zoom in enough, the resolution is very fuzzy. If you want to look at your backyard, for example, that is impossible. If you use the earth ...
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3answers
93 views

Sequential cloud mask closest to date in Google Earth Engine

I'm interested in transitions that occur on a date, such as bushfires. I want to get the closest (in time) cloud-free landsat image possible using as many images as necessary in the collection up ...
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2answers
67 views

No Landsat across northern Australia in 1974-1977

Why there is no Landsat imagery available for the Gulf of Carpentaria, northern Australia, in 1974-1977? I have obtained imagery via USGS Earth Explorer from 1972 through to 2017, but there is a gap ...
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2answers
61 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 ...