Questions tagged [landsat]

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

Filter by
Sorted by
Tagged with
0
votes
0answers
14 views

How is Band 8 (panchromatic) of Landsat connected to Surface Reflection/Albedo?

I want to work with the surface reflection/Albedo of Landsat 8 and got told to use B8 which is the panchromatic. It catches all the visible light so it makes sense to me that it is connected but I ...
0
votes
0answers
23 views

Land classification confusion matrix pixel total and toList() pixel total not matching

Using Landsat imagery and a CART classifier I have successfully carried out land classification and computed a confusion matrix for one full Landsat image, please see: https://code.earthengine.google....
0
votes
1answer
15 views

Adding layer titles to summary table using batch processing and ModelBuilder

I have 180+ Landsat Raster Layers open. Part of the layer names in the TOC include the date the image was taken. I'm trying to get weighted average NDVI for each layer in one summary table. This is ...
0
votes
0answers
9 views

What do the following eigenvalues/eigenvectors tell me regarding the bands in the following LANDSAT TM image?

I am struggling to understand the interpretation for eigenvalues for a false-color NIR LANDSAT TM image. The image is shown below. (Note: I'm using ENVI Classic, but this is a general question and not ...
0
votes
1answer
26 views

Merging two landsat images

I have several Landsat 5 Images to merge together. As far as I saw from tutorials and previous questions there are two main methods (and none seem to be working for me): 1 - raster » miscelaneous » ...
0
votes
0answers
27 views

Cannot download Landsat 8 images from RGISTools R package

I've been having a hard time trying to automate some Landsat 8 image download and processing for my project. At first, I tried to use getSpatialData package to do what I need from R, but it seems the ...
1
vote
0answers
28 views

Estimate cross-covariance of seasonality (NDVI) and precipitation data with a harmonic regression model then visualize a chart from the model

The challenge is to estimate cross-covariance of seasonality (NDVI) and 30-day precipitation with a harmonic model. I added the UCSB CHIRPS rainfall data as bands to all available Landsat 8 imagery ...
0
votes
1answer
42 views

Get DEM from Google Earth Engine

How can I get ASTER or SRTM DEM for years like 2016, 2020,... in Google Earth Engine? I can't filter date for SRTM DEM in GEE. It seems that SRTM DEM doesn't have multi-year data, it was captured only ...
2
votes
1answer
37 views

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 ...
1
vote
1answer
56 views

Rename Landsat bands across sensors in Google Earth Engine

I'm trying to rename bands with standardized names across different Landsat sensors. When I add layers using visualization parameters for the new standardized band names, I get errors like this: "...
0
votes
0answers
40 views

Unable to download images in Semi-Automatic Classification Plugin (SCP)

I am using version 3.10, and I am trying to download images directly from the QGIS. The Semi-Automatic Classification Plugin (SCP) seems to work fine, I can find all the available images. However, ...
1
vote
0answers
21 views

Create a custom buffer in Google Earth Engine

I am working to make mosaics of Landsat 5 scenes that cover watersheds in Montana, and am currently struggling to deal with the "rough edges" on the east/west sides of scenes that get ...
0
votes
0answers
50 views

Earth Engine: Combine time-series of NDVI from Landsat 5, 7 and 8, into one image collection and export CSV values

I'm working with 79 different research sites in Oregon where I need to extract the full time-series of NDVI values for specific areas around natural springs and then compare them to a corresponding ...
1
vote
1answer
38 views

Filter scene overlap in image collection

How can I filter areas of scene overlap so that each pixel only has data from one landsat scene? My goal is to have as many images as possible while also maintaining a uniform number of images across ...
0
votes
0answers
18 views

Accuracy assessment (confusion matrix) of image classification from Landsat imagery in SAGA GIS

I have classified Landsat images in two different classes, namely pervious and impervious, in SAGA GIS, using training sample in polygon shapes. This training sample has only one column of attribute ...
0
votes
0answers
65 views

Difference between two atmospherically corrected Images

I corrected Landsat 5 image with two different methods, first atmospheric correction through calibration (means converting raw image into radiance), second atmospheric correction through QUAC ...
0
votes
0answers
30 views

Using i.albedo in QGIS

I was wondering if anyone has used the i.albedo processing tool in QGIS? I am looking to do an analysis on a composite image from Landsat 8 and don't really know where to begin. I am using version 3....
1
vote
1answer
73 views

Landsat footprint artifacts in statewide CCDC map

I have produced a map for New York State using CCDC as implemented in google earth engine. The map counts the number of disturbances for each pixel occurring between 1990 and 2019 (black = 0 ...
0
votes
0answers
10 views

Landsat MSS data Masking for Clouds and Water bodies

I'm trying to construct mask for Landsat-1 mss data for: clouds clouds shadows water bodies Mainly using either ArcGIS, ENVI, Matlab and R softwares. Firstly, I started with the mask for water bodies. ...
1
vote
0answers
53 views

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 ...
0
votes
0answers
15 views

Seeking Moderate to High Resolution Forest Fire Before and After Images

I'm trying to search through the moderate to high-resolution satellite image data sets for imaging that shows forests both before and after a forest fire in order to assess the burn severity and the ...
0
votes
0answers
60 views

Google Earth Engine: Black Landsat 8 Image to corresponding samples

I am very new to the GEE. I'm trying to create reference labels for samples interpretation. When I try to display the corresponding Landsat images for the sample units, all Landsat images would just ...
0
votes
1answer
33 views

Can you use Landsat 7 to make studies of land surface temperature, even though it has the scan line problem?

Is it recommended to use Landsat 7 to study the temperature of the surface? If you fill the gap of the scan line errors, would that gap filled give you different results from the original image?
1
vote
1answer
133 views

Implement system:time_start for NDVI trend analysis in GEE

I am developing a yearly NDVI trend analysis using Landsat data in Earth Engine over the last decades. My process is to add a NDVI band to every scene for each summer (green) month, then to reduce the ...
0
votes
1answer
124 views

Obtaining yealy maximum NDVI values from Landsat, Earth Engine code editor vs rgee package

I am trying to obtain the Landsat yearly maximum NDVI values for a region using Earth Engine through the R package rgee (an implementation of Earth Engine Python API for R). So far, I had success in ...
1
vote
1answer
49 views

Vegetation Change Tracker and GEE: What bands are required?

I'm hoping to use the GEE implementation of the Vegetation Change Tracker (VCT) algorithm here: https://developers.google.com/earth-engine/apidocs/ee-algorithms-temporalsegmentation-vct#javascript I'm ...
0
votes
0answers
19 views

Landsat NDVI collections, are they cloud filtered?

I am wondering if the Landsat NDVI collections (e.g. https://developers.google.com/earth-engine/datasets/catalog/LANDSAT_LT04_C01_T1_8DAY_NDVI) were cloud-filtered before their creation? I know these ...
1
vote
1answer
52 views

Fulfilling removed cloud area with free cloud data in Google Earth Engine

I have completed doing cloud removal with Landsat image (in this case is Lansat 8) in the Google Earth Engine. Of course the result of this process is the cloud pixels become no data, consequently the ...
1
vote
0answers
41 views

Create Time Series Chart of NDVI (based on Landsat 5) of a National Park in Germany with Google Earth Engine

So this is my code so far: My Questions: How do I name the title and x-axis and y-axis? It isn´t working with .setOptions({title: 'NDVI Bayrischer Wald Landsat 5 1984 - 2013'}) unfortunately. How do ...
0
votes
1answer
63 views

Google Earth Engine Matrix Multiply Error?

In the below code, Tasseled Cap algorithm computed using array based computation but returns error and I don't know how can I solve this: code link: https://code.earthengine.google.com/...
0
votes
1answer
26 views

I need to export the list of IDs of the satellite images available in Google Earth Engine to work in Excel. I just need the ID

I am working with Google Earth Engine and I need to export the collection as a list, to be able to work it in Excel. What I mean is being able to export the list of the ID of the available satellite ...
1
vote
1answer
49 views

Combine slope info with Landsat for classification in Google Earth Engine

I wanted to add slope data as a band to filtered Landsat data. I used ee.Image.cat to "merge" two images. I can see added band in a merged image, but when I perform the classification (which ...
0
votes
0answers
33 views

Landsat imagery corrections

I have downloaded Landsat collection 1 Level 1 imagery (Landsat 4,5,7 and 8) from https://earthexplorer.usgs.gov/. I would like to know that do we have to apply some conversions or corrections before ...
0
votes
0answers
37 views

Distinguish between agricultural lands and other land types in the Google Earth Engine

I have classified an image into 5 different categories of soil land, build-up, jungle, water, and the lands that are green but are not jungle. Now, I want to write a code to separate and distinguish ...
0
votes
0answers
68 views

Google Earth Engine vegetation index

I am trying to make maps and histograms for Landsat EVI. My code (extract below and full thing attached) works but the results seem very strange. The histogram outputs are bimodal, despite the exact ...
2
votes
1answer
44 views

Issue while creating dataset mask for Landsat 7 ETM+ band data by using rasterio

I am trying to create dataset mask of a particular band of Landsat-7 (B2) & Landsat-8 (TIR) data and then plot the same using the following code: For Landsat-7 Band-1:- import rasterio import ...
0
votes
0answers
17 views

After export the clipped Landsat image, it's distorted

I clipped square(polygon) of NDVI and Aster GED dataset and select the scale of 100 and set CRS to native projection and Exported to drive. But when I am Opening this dataset in QGIS it's showing ...
2
votes
1answer
35 views

Explanation on band conversion from radiance to reflectance final value

I've watched few video on conversion of radiance to reflectance for landsat band, most of them recommended to use formula below to to make sure the final reflectance value lies in between 0 to 1. My ...
0
votes
0answers
26 views

Copernicus OpenSearch API rate limit

I'm looking to download Sentinel imagery using an API (only), and as part of this process I would like to identify which tiles lay in the area I am interested in by providing the relevant bounding box ...
1
vote
1answer
66 views

Percentage value when resampling GEE

I am trying to resample a landsat NDSI image to a MODIS NDSI image. When I run the code below and use the inspector to click on a few random points in the image, it provides the normalized difference ...
0
votes
0answers
34 views

Viewing Google Earth Engine source code — Landsat TOA

I am working on a project looking at satellite calibration, and would like to see how Google Earth Engine performs ee.Algorithms.Landsat.TOA(image). I know that they incorporate the metadata ...
0
votes
0answers
33 views

How do I produce a time series of the NDVI with Landsat composites with Google Earth Engine?

I am trying to obtain a yearly time series of the NDVI values for a series of locations, specifically 82 random squared polygons. As I need the best temporal resolution possible, dating back to the ...
1
vote
0answers
24 views

How to blend Landsat scenes in image mosaic?

I have Landsat scenes in the same month but different dates. All are atmospherically corrected. I want to mosaic them but the colors/tones of the final result did not blend. I do not think adjusting ...
0
votes
0answers
77 views

How to get the value of specific pixels in Google Earth Engine

I want to extract the value of some pixels. I have already select the pixels that I want to extract the value with this code: var pixel_snowcover = glacierfilled_M1.select('albedofill1').map(...
2
votes
1answer
21 views

Why do Landsat images sometimes form triangles instead of 4 sided polygons to cover areas?

I put several Landsat8 images into ArcMap 10.7. I don't get the same kind of coverage (square area) you see in the first picture from the Earth Explorer site. I instead get picture 2: corners, ...
0
votes
1answer
165 views

How to calculate the number of pixels with a specific value in a image Google Earth Engine

I am trying to count the number of pixels who are equal and greater than 0.6 in a specific band (albedofill1). I am trying to count this for every image in my collection (glacier_final). For now, I ...
2
votes
1answer
24 views

Big holes in the Landsat record?

Does anyone know why there are multi-year gaps in the Landsat record in some places? This screenshot is from earthexplorer, but I found the whole when my Earth Engine code wouldn't run because it ...
1
vote
1answer
59 views

Clipping imagery to regions of interest with Google Earth Engine before exporting

My code currently collects all Landsat imagery and then creates a mean summer NDVI for each year. I would like to clip the the summer raster to an vector polygon shapefile (such as attached). ...
0
votes
1answer
83 views

Using the pixel quality layers of the Landsat SR products to create cloud and water masks in R

I tried to use the RStoolbox package function classifyQA to generate information on quality of the layers of interest, namely - cloud, cloud shadows, and water. I am unable to understand how to mask ...
0
votes
1answer
88 views

Extract landsat pixel values over plots with measurement dates

I am trying to get landsat reflectance values corresponding to field plots spread all over Finland in Google Earth Engine. Each plot is small, hence is represented by a single point (lat, lon). It ...

1
2 3 4 5
11