Questions tagged [landsat]
A series of Earth-observing satellite missions jointly managed by NASA and the U.S. Geological Survey.
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Pansharpen Landsat 7 RGB using gdal_pansharpen.py
Is it possible to pansharpen Landsat 7 RGB band combination (without NIR) to have approximately the same intensities as the original RGB image with gdal_pansharpen.py (weighted Brovey algorithm)?
What ...
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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 ...
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Plotting Bare Soil Line on landsat data in RStudio?
I am using RStudio with landsat package for computing and plotting the Bare Soil Line (BSL) on landsat tif image running on my HP Pavilion i7 laptop. The codes for running the BSL() function is as ...
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Landsat Collection 2 surface reflectance harmonization
I am using Landsat 5, 7, 8 collection 2 level 2 to extract NDVI time series with GEE.
Is it necessary to apply the Landsat ETM+ to OLI Harmonization with the Roy et al. (2016) coefficients to ...
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EVI in Google Earth Engine
I calculated the EVI for a Landsat image from -1 to 1. However, when I use the inspector tool in GEE and click around on my image, I see I have values less than -1. Is there something wrong with my ...
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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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SPOT and LANDSAT images on the same grid
Let us introduce ourselves, we are a GIS team of the Cartographic division of INDEC (the national census bureau of Argentina). We are working on the next national Agricultural Census 2018, which will ...
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Negative reflectance values after topographic corrections (cosine correction and modified Minnaert correction)
I am trying to manually correct the surface reflectance values of some Landsat 7 and 8 images. I'm using Minnaert modified method, which uses the cosine correction as one of its inputs (see below the ...
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How do I report area statistics for land cover classes at equal sections along a river?
I have a river outlined:
Using QGIS, the Semi-automatic Classification plugin and Landsat 8 images I classified the habitats (blue=water, yellow=sand/rock...,green=vegetation/algae) inside the river ...
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How to use a conditional logic on Impervious Mapping
I am trying to use a logic ( rule -based classification ) to extract built-up area, similar to as suggested by Xu (2007).He uses, three spectral indices, SAVI( Soil Adjusted Vegetation Index), NDBI ( ...
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Using Python script to stack layers from multiple directories and produce multiple outputs in ERDAS?
I am using ERDAS Imagine 2013 and am trying to create a Python script that takes lists created in another script containing the path to each scene's raw data folder and base image ID's (for example ...
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NDVI from rescaled Landsat 8 L2 product is out of range
I need to use Landsat 8/9, level 2 products, to compute NDVI. I know that I need to scale band 4 and 5 before compute the index. Here there are the official scaling factors.
So, as example, I apply ...
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Using images from different Landsat missions and Sentinel-2 for machine learning
I am doing some image segmentation using random forests on satellite imagery. The events I am trying to detect are somewhat rare so my training sets are very limited if I want to use Sentinel-2 ...
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How can we know that a random satellite image is atmospherically corrected or not using python?
If a satellite image in .tiff format was given. what are the values that can be obtained from a satellite image using python to see whether it has atmospheric errors or not?
I am expecting what values ...
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Exporting EVI image on Google Earth Engine with visual parameters between -1 and 1?
I am having an issue with exporting an EVI image with the visual parameters between -1 and 1. On Google Earth Engine (GEE), using the inspector tool, the values are between -1 and 1, but when I export ...
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Landsat L1GS product processing to change detection analysis ready state
At high latitude area of Svalbard Norway, one can find Landsat 8 data processed to L1TP level. With previous Landsat missions, this is not the case. Landsat 7 data are processed to L1Gt level and ...
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Why is ReduceRegions returning null values when I reduce using a feature collection?
I am running a landtrendr script which returns some disturbance-related values (year of disturbance, duration... among others) for an area. I would like to reduce the result of the area by a large ...
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Aligning pixels for using GSW as mask layer with Landsat 8 and Global Surface Water (JRC) Layer
I want to isolate some surface water areas on Landsat 8 images by using the Global Surface Water dataset in GEE as mask. After mapping both in the Editor I realized the positions of pixels of GSW and ...
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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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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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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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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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Pitch Black Bstack_raster.tif image after Stacking Landsat 8 bands using SCP plugin
I encountered a disruptive problem while following a step-by-step guide of the Land cover supervised classification from a document accessed from https://arset.gsfc.nasa.gov/sites/default/files/land/...
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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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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 ...
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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 ...
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Alignment, raster time-series, R
I have a Landsat raster time-series (2000-2016) of 102 rasters for the same location. Since the original Landsat scenes don't overlap exactly, I defined a polygon to use for cropping all the rasters ...
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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 ...
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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 ...
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Snapping vectors to vertices for ROI delineation?
I am trying to manually extract a set of ROIs in ENVI 5.0.
However, I can't seem to successfully line up the vector to be flush with the boundary of the pixels, which means I don't have fine-tune ...
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Calculating Aerosol optical thickness from Landsat 7
EDIT I have added question down
I am reading one paper and I found method to retrive AOT from landsat 7 image
This should be simplifield equation, because they assumed observation zenit as 0. Than ...
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Landsat images from same path/row have different shapes
I'm starting to play with satellite imagery. In particular, I am using images of the Landsat 7 and Python. I open two TIF images of the same place but at different times to the numpy arrays and they ...
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Important to perform atmospheric correction when attempting to identify coral reefs?
I want to identify coral reefs using multi-temporal Landsat data and Lyzenga's Transformation method. In relation to pre-processing the image, should atmospheric correction be done or not? If not, ...
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Georeferencing multispectral data using ArcGIS Desktop?
I often have to georeference Landsat data image to map (often raw data without geometric corrections). The way I am doing this is to open up one channel and set my GCPs and save them into a txt file. ...
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QGIS 2.4.0-Chugiak: How to produce raster colour map
By carefully deriving the NDVI values from Landsat Band 3 and Band 4 after doing atmospheric correction by applying DOS1 method in semi-automatic classification Plugin QGIS, I was to calculate the ...
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Change Detection ArcGIS with multiple dates
I'll explain my aim first: I am trying to create a single raster to represent vegetation resilience, I am doing this via change detection.
So far I have created 5 Change detection images, where 2000 ...
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Analyzing signatures for Landsat clasification with Sextante in QGIS
I am defining my training data for a Landsat classification. I am digitizing the polygons with the field data in QGIS and I want to analyze the signatures of the Landsat images to avoid errors.
In ...
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What is the difference between surface reflectance and top of atmosphere (TOA) reflectance?
I was told that during winter it is better to use TOA because SR is not good for winter. But I didn't find any files describing it. Can anyone explain the difference of these two and why they perform ...
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Applying temporal water masks to temporal Landsat composites
My goal is to create monthly water masks using an NDWI index with Landsat. Additionally, the code should allow a user to select their own temporal window, but in this case the goal is monthly. In ...
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Directly working with data from different platform without having to download it in Google Earth Engine
Is it possible to import and work with data that is not hosted in Google Earth Engine without having to download it?
I am working with a publicly available Global Man-made Impervious Surface (GMIS) ...
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Is there a publicly available higher resolution equivalent to Landsat 8/9 TIRS?
I have a strong feeling the answer to this question is no. That said, I'd love to be wrong.
I'm looking to estimate land surface temperature at a higher resolution than the 100m bands (10 and 11) on ...
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Layer error: Image.rename: The number of names (2) must match the number of bands (12)
I'm using landsat 9 raw data and get some topographic correction before, for canopy density mapping, after all band input to the equation for FCD there are error message appear, it said"Layer ...
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Video Exporting Black/White Odd Image Landsat 4/5 and other Landsats in GEE
I am able to get variations of this code to work with Sentinel images, and with a heatmap image collection from Yale. However, I have tried with every landsat collection, and I always get videos that ...
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Pixel value backwards compatibility Landsat collection 1 and 2
Background: I have a machine learning model that is trained on values derived from Landsat Collection 1 images extracted from Google Earth Engine. Collection 1 is deprecated and about to be purged ...
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Landsat 8 panchromatic band and multispectral overlap in GEE
I'm trying to overlay multispectral band with panchromatic band from Landsat8 in GEE.
Although these bands are perfectly overlapped in QGIS, it is not in gee. Why did this happen and, of course, is it ...
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Different NDVI ranges caused by multiplicative scale factor and additive offset
I am trying to calculate NDVI using Landsat 8 Collection 2 Level 2 data. My problem is that, before applying the scale factor and the offset, NDVI range is correct. After applying the scale factor and ...
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Problem using cloud masking
I am using Landsat 8 L2C2 products and I am trying to use Quality Assessment Band for Cloud Masking. The problem is that, I don't know which values to use on the remap properties tool. I am expressing ...
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What are the band units of L8C2L2 before applying the scale factor?
Bellow there is an image which shows "Collection 2 Landsat 8 Level 2 Science Products Band Specifications". When I use the multiplicative scale factor and the additive offset on Band 10, I ...
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How to face outliers on a raster?
I am trying to calculate a Soil Moisture Index using the procedure of this article: "Estimation and evaluation of high spatial resolution surface soil moisture". My final SMI's range is not ...
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How to calculate NDVI, EVI with Landsat 5 images?
How to calculate NDVI, EVI with Landsat 5 images?
I downloaded the Collection 2, Level-2 image of Landsat 5.
I calculated NDVI and EVI for Landsat 5 images using QGIS.
EVI =2.5 * ((Band 4 – Band 3) / (...
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