Questions tagged [landsat]

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

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29 views

Producing Vegetation indices maps and histogram using SAGA GIS?

I am planning to analyze changes in vegetation for past 30 years in a forest using Landsat Imagery, as this forest consists of two different shots of Landsat; I have merged them in accordance to ...
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21 views

ImageCollection (Error) User memory limit exceeded. Mean annual land surface temperature landsat data

I am trying to calculate mean annual and monthly land surface temperature for three image collection of landsat8, Landsat5, and landsat7(image collection of landsat7 and landsat 5 are merged). The ...
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10 views

Image Difference in Erdas Imagine [closed]

I want to calculate change detection using Image Difference technique in Erdas Imagine in which you need to add after and before images. Is it compulsory to add the same bands for change detection? ...
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54 views

Export Google Earth Engine Landsat Image to Google Drive not working in Python API

I am trying to export a collection of Landsat images (but at this point I will settle for a single image) from Google Earth Engine to my Google Drive. I am using the Python API from my local terminal ...
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35 views

Spectral signatures chart in Google Earth Engine

I have been reading the documentation and some related questions online, but I cannot seem to make it work. I use Google Earth Engine to access an old Landsat 5 image, and classify later on. I want ...
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1answer
54 views

Min and Max for each image of NDVI to calculate Em and LST

I am working on my script to calculate LST for all the images in the collection separately and then use the calculated LST to estimate Mean Annual LST. I have calculated NDVI for each image, and the ...
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18 views

Batch downloading LANDSAT imagery based on nearest image capture date

I have a 30-year large dataset (100,000+ points) of insect outbreaks (0=no out break, 1= outbreak) throughout Australia. I am interested in seeing if the spatial configuration of vegetation is a ...
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9 views

Unclear how to implement weighted average of GoLive velocity data

I am trying to apply the weighed averaging scheme outlined in Scambos et al. 2007 to GoLive surface velocity data in Antarctica. Essentially, for a given Landsat scene I have a number of ice ...
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18 views

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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1answer
36 views

Replacing cloud values with NA in a raster stack

I am removing clouds from a raster stack of 768 pixel_qa bands which are provided by USGS as part of surface reflectance product. The details of raster stack (qa) are: > qa class : ...
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Ambiguity on Tasseled Cap coefficients for Landsat platforms

According to this post Tasseled Cap Transformation coefficient and Bias Value and one of the answers, the Tasseled cap coefficients are intended to be used on TOA data, not surface reflectance. I ...
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67 views

Enhanced Vegetation Index( EVI) Value Interpretation

Im working on calculation of Calculation of Enhanced Vegetation Index(EVI) From Landsat 5 TM and Landsat 8 OLI Using ArcMap 10.4.1. As far i know to Calculate EVI, first it needs to Convert the DN ...
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66 views

Increasing spatial resolution of Landsat MSS and TM images? [closed]

I am trying to do a timeseries analysis of morphological change in the coastal zone using images from Landsat 1 MSS, Landsat 5 TM, Landsat 7 EMT+ and Landsat 8 OLI. My problem is that although I can ...
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44 views

Bidirectional reflection disturbance function (BRDF) for Landsat imagery in earth engine

I am wanting to use various vegetation indices calculated using Landsat imagery. I am aware that BRDF is an important correction to do, but I am unsure where to start. Is there a product with ...
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1answer
38 views

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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11 views

Landsat 1MSS composite colour

How can we match the Landsat 1 MSS and Landsat TM, ETM + and OLI bands? I have a scene of 1973, but on this one, there are only the bands 4, 5, 6, 7 and the bands T2_BQA and T2_VER, unlike the other ...
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82 views

How to perform change detection using LandTrendr in Google Earth Engine?

I am having very basic skills in LandTrendr, I want to make a map showing year of detection and another magnitude of change, but I keep getting errors. I suspect the problem to be with the image ...
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51 views

Mass downloading Google Earth historical imagery

I've been working with the historical imagery in Google Earth and I'm wondering if there's an easy way to download the geoTIFFs for my study area. It doesn't seem possible from Google Earth itself. ...
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116 views

Merging two Landsat TIFF file of same band in QGIS 3.4

I've been wanting to merge two TIFF files of same band (this case it will be B1 in Landsat). I have followed tutorials which I came across online, but none of them seems to work. Generally, raster > ...
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1answer
91 views

Making intra-annual image composites for a series of years in Google Earth Engine?

Below is my code to build a time series collection of all ETM+ and OLI Landsat images intersecting my region of interest. Now I want to build an ImageCollection that represents the mean or median of ...
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39 views

Cropping Landsat images with shapefile in MATLAB

I want to crop several Landsat images, of different satellites, in MATLAB employing a shapefile. For only one image, I could manage to do it properly. But if I try the same with a second image, the ...
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1answer
28 views

GEE Select images that have certain number of pixels

I have code that calculate NDVI for Landsat 5,7 and 8. I would like to know how can I "filter" my image collection so I have only images that have a certain number of pixels. For that I thought maybe ...
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1answer
40 views

Understanding the metadata in GEE

I have code that retrieve images from Landsat 5 , calculate NDVI , display the rasters and export it to my drive, giving names to th rasters according to their ordinal number. My problem is that I ...
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43 views

How to get the fitted data in GEE LandTrendr for the changes defined by vertices of initial veg. index (e.g. NBR)?

What I have: NBR layes of magnitude, year of disturbance, etc. for the AOI. What I expect to have: fitted values of TCW, TCB, TCG defined by vertices of NBR time series I mentioned above. I cannot: ...
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36 views

Mask clouds across multiple images using Google Earth Engine

I Have multiple Landsat8 images at the same place in different years. I want to have a cloud mask for each image, then merge the mask so that all images will be masked with a same aggregated mask. I'...
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28 views

Generate LULC maps using Sentinel data of European Space Agency?

I found out that Sentinel data is of 10m x 10m resolution whereas LANDSAT data is of 30m x 30m resolution. Did anyone come across research in which Sentinel data is used for making LULC maps or is ...
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Difference between local and global image co-registration

I want to co-register Landsat and Modis image after Reprojection and Resampling. So for that I was trying to understand the difference between local and global image co-registration of this library. ...
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2answers
93 views

Can BFAST algorithm be applied to to a whole study area/ ROI?

I am working on identification of breakpoints in Landsat based NDVI time series (1990-2018). I am using The Breaks for Additive Seasonal and Trend (BFAST) algorithm which is a pixel based time series ...
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1answer
32 views

Landsat image exported from Google Earth Engine not displaying correctly in ArcGIS [closed]

I have run a script to produce a land use classification clipped to my study site using google earth engine. However, when i export the classified image and open it in ArcGIS, the image is cut off at ...
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'Faulty' Landsat-8 Images (Collection 1 Tier 2) for Antarctica? [closed]

Whilst working with the Landsat collections across Antarctica I have noticed that recent L8 images (from late 2017-present) appear to not be 'correct' in GEE. Images from this time period appear black ...
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2answers
30 views

Query about Satellite Thermal Imaging [closed]

I am working on my undergraduate thesis and for this I need access to Satellite Thermal Imagery. I have spent some time looking at how to get these Images. I know from my investigation in the last 1 ...
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1answer
119 views

Time series for MultiPoint geometries in Google Earth Engine

I am trying to generate time series for a set of points in earth engine. I am attempting this for multiple datasets, but for now let's do NDVI with Landsat 8. My problem lies (i think) in step 6. ...
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Reasons of displacement between same photo taken from two different satellites [closed]

So I am interested what could be the reasons for displacement when comparing the same photo taken from two different sattelites (ASTER, LANDSAT). I need this for my study so I would be thankful for ...
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1answer
252 views

Google Earth Engine really slow in loading maps

I am using the code below to run random forest classification, clip and mask the layer, and then export the map to Google Drive. I expected the export process to be slow. Nevertheless, why are the ...
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1answer
13 views

i.landsat.dehaze add-on for Grass 7.x

What happened to the landsat add-ons i.landsat.dehaze and i.landsat.trim in grass7? I keep seeing references to them but cannot find them in the repository.
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128 views

Conversion of Landsat ToA reflectance to BoA reflectance with an equation

I am using temporal datasets from Landsat 5, 7 and 8. Since I have many datasets I would like to include the conversion from ToA(top of atmosphere) to BoA(bottom of atmosphere) reflectance into a ...
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32 views

co-registration/radiometric normalization for L1 Landsat products

I have downloaded Level 1 temporal datasets from Landsat 5, 7 and 8. My target is to calculate the NVDI and compare it over time with more indices at the same AOI. As the Landsat Level 1 ...
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40 views

Access to Harmonized Landsat Sentinel 2

Can anyone check access to https://hls.gsfc.nasa.gov/data/ from AWS. I recently discovered a 403 error while trying to load data from a location above. This error I get only from AWS instances. From ...
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Calculating Satellite Azimuth from Landsat WRS data?

I found the below answer in regards to how one identifies the satellite azimuth from Landsat Images, but am not sure how you translate the path/row into azimuth angle. I have searched for such, but am ...
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1answer
29 views

Landsat TOA TI and Landsat TOA T2

I want to know the difference about TOA T1 and T2. Are they two repeating collections? I want to use the imagecollection (merge from Landsat TOA T1 and T2). How can i achieve it?
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58 views

Failure in merging Landsat 4/5/7/8 collections?

The paper Murray, N.J., Phinn, S.R., DeWitt, M., Ferrari, R., Johnston, R., Lyons, M.B., Clinton, N., Thau, D. & Fuller, R.A. (2019) The global distribution and trajectory of tidal flats. ...
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1answer
53 views

Finding cloud cover score of Landsat image?

I want to find cloud cover of an image This is my code: var image = ee.ImageCollection('LANDSAT/LC08/C01/T1_TOA') .filterBounds(district) .filterDate('2015-03-01','2015-05-01') .sort('...
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1answer
45 views

Do I need to perform any corrections on Level-2 Landsat imagery?

My objective is to perform a land cover classification with multiple scenes over historical imagery (one year every decade). Most of the imagery I have downloaded is level-2 imagery. From my ...
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85 views

Set Root Mean Square Error (RMSE) as feature properties

Using Landtrend library in Earth Engine, I can use a property that comes as default to calculate the square mean error (RMSE) and, then use this property to apply the current formula for this model: ...
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34 views

Integrating Tidal Calculator into Google Earth Engine [closed]

I am trying to use Google Earth Engine to explore changes in coastal areas over time using LANDSAT imagery. A key piece of this will be to determine what LANDSAT images were taken at high tide and ...
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2answers
68 views

Visualize Image Collection

I have created image collection in GEE of LANDSAT 7 NDVI (LANDSAT/LE07/C01/T1_8DAY_NDVI). I chose date range and I know I have 71 images in the image collection. Is there any way to clip all the ...
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248 views

Calculate mean value from list features in Google Earth Engine

I created a FeatureCollection containing 63 features with a different date, from one filter per ID. In each of these 63 features, I created a new property named "matches" that contains a new list of ...
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19 views

Error generating chart because computed image is too large

I want to export a graph of type ui.chart.image.series in the GEE in CSV format. This graphic is built into the browser after two different collections of images (one I named "Collection" and the ...
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56 views

ALOS PALSAR resampling

I want to combine Landsat bands with the backscatter coefficients of ALOS PALSAR. I used the following code to resample and combine. However, the HH, HV bands in combine image showed with 'masked'. I ...
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1answer
95 views

Pixel alignment for trend analysis in Earth Engine

I am trying to calculate NDVI trends over time using Landsat scenes and the earth engine code below: var point = /* color: #d63000 */ee.Geometry.Point([-133.49, 69.18]); var l5 = ee....