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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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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
16 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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29 views

Snowline extract elevation using NDSI index in Google Earth Engine [on hold]

Im try extract snowline elevation values using the NDSI index (normalized difference snow index), with the target of to know the variations of height over Landsat collection. Im new in the ...
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1answer
43 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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31 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
23 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
20 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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37 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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38 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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Is it possible to perform time series analysis on Landsat imagery data?

I have a 20 years of the Landsat imagery data for which I need to perform some analyses including cropping them to some specific geographical locations and extracting the surface reflectance values ...
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2answers
31 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
58 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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35 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
32 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
28 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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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
35 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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59 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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37 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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49 views

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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1answer
35 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
100 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
19 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
49 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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1answer
39 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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17 views

Is there a way to classify a satellite image in arcgis using all bands for more accurate classification?

-I want to classify a Sentinel 2A image which has 12 bands and a Landsat 8 satellite image wich has less bands. -How do I overcome the mountains shade? -In theory there would be 5 classes if you ...
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12 views

USGS Landsat image: About pretreatment

According to USGS-Landsat T1 : All Tier 1 Landsat data can be considered radiometrically calibrated and geolocated consistently across the full collection for all the sensors. So my question is, if ...
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26 views

What's stacking in time-series in Remote Sense?

I am learning time-series of remote sense. My adviser told me that there are two categories of time-series, slicing and stacking. I couldn't understand what's stacking is thought I know what stack is ...
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35 views

Exporting corrupted image in Google Earth Engine night time luminosity data

I am exporting time series of Landsat and night-time luminosity data from Google Earth Engine, one cleaned composite per year from now back to 2000. I export the yearly images to my Google Drive. I ...
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2answers
150 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
57 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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69 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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21 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
75 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
37 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
144 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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31 views

Seeing alignment issues between ESRI's Pansharpened Landsat and World Imagery layers?

I'm using Landsat and World Imagery to assess some landscape changes over time and then drawing polygons to highlight certain things. I've noticed that when I draw a polygon while viewing one layer, ...
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1answer
60 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
189 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
63 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
66 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
48 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 ...
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2answers
182 views

Landsat 8 BQA - using cloud confidence to create a cloud mask

I want to use the Landsat BQA (TOA images) to create a cloud mask in GEE. In particular I want to mask out all areas where there is high confidence that cloud cover is present. I have tried to adapt ...
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2answers
274 views

Creating opacity mask in Google Earth Engine?

I have an NDSI snow layer loaded in Google Earth Engine. Since snow is present for values <0.4, I want to make values >0.4 opaque. I looked at the manual's examples, but this code is not giving me ...
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19 views

Zenith and Azimuth Angles of OLI sensor of Landsat 8 [duplicate]

I am working with l8. How i can calculate Zenith and Azimuth Angles of for Landsat 8?
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0answers
26 views

Merge two reflectance layers in QGIS

I currently have two Landsat 5 reflectance value layers that were calculated from the per-processing function in SCP for QGIS. I would like to merge these two images together to create one mosaic ...
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1answer
739 views

download Landsat data from Google Earth Engine for the Continental United States

I need to download one image of the Landsat 7 NDVI 32 day from Google earth engine for the continental United States. Just this specific one image from 2005-08-13 to 2005-09-14. Please see my code ...
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0answers
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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 ...
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Stacking and masking Landsat at the same time with rasterio

Based on answers from previous questions 1,2 and the Masking a raster using a shapefile guide from rasterio cookbook, I wrote the code below. The code runs correctly. I would like to improve it. 1- ...
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1answer
250 views

Add bands' name and description to the Metadata when stacking using rasterio

I'm using this code, of @Loïc Dutrieux, to stack 8 Landsat bands. with rasterio.open(final_list[0]) as src0: meta = src0.meta with rasterio.open('stack.tif', 'w', **meta) as dst: for id, layer ...