Questions tagged [google-earth-engine]
Google's cloud computing platform for geospatial data & analysis at earthengine.google.com.
5,486
questions
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'Year' variable not applied in Earth Engine Example?
I wonder if the year variable in Google Earth Engine's example 'Sentinel2 Clear Composites' is actually applied or working. https://code.earthengine.google.com/1885668f9f476d9f8f917b2fde0b00cd
To the ...
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votes
1
answer
39
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Should I use map or iterate in EarthEngine?
I'm working with Earthengine with a commercial license now so I started worrying about the performance of my computations. As the caching mechanism is preventing me from doing performance checks on my ...
- 2,650
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16
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Mask get wrong value
While trying to see if 2 images share some matching pixels I try to implement the mask() function.
In order to do so I used image1.mask(image2)
Here is an example :
Mask of Image 1 :
Mask of Image 2 :...
0
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1
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41
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When loading a DEM in Google Earth Engine, it doesn't load the full map extend
I want to download a digital elevation model for a major part of Europe.
Last time I tried it with the "NASA NASADEM Digital Elevation 30m", wich can be found here: https://developers.google....
- 29
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16
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Selecting only matching mask between 2 FeatureCollection
In order to do linear regression between Landsat8 and Modis Aqua datasets I want to select the images of Landsat & Modis that cover each other for each date.
I have already selected the matching ...
-1
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58
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I am not able to use the Vegetation Change Tracker algorithm of GEE
// Load a Landsat image collection
var landsatCollection = ee.ImageCollection('LANDSAT/LC08/C01/T1')
.filterBounds(roi)
.filterDate('2021-01-01', '2021-01-17')
.sort('system:time_start');
...
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0
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17
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Implementation of below equation in jupyter or gee
Explanation for the equation: where A is the azimuth of the search direction, (xi , yi )are the coordinates of the cell of interest, and (xy , yy )are the set of all cell coordinates located along the ...
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40
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Efficient way to handle large Sentinel - 2 imagery dataset
I need to automatically crop large number of polygons (~200K in a geojson file) from Sentinel-2 images varies both in extent (~30 tiles) and time (from May till August, say it's about 30 images) so if ...
- 157
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22
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Use GEE downloading worldwide images results in a very narrow line
var imageCollection = ee.ImageCollection("projects/verselab-398313/assets/HiQ_LAI/wgs_500m_8d");
var MODTSS = imageCollection.filterDate('2021-01-01','2021-12-31').select('Re_TSS_MOD');
var ...
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7
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No valid training data were found. (Error code: 3) with Random Forest
In the last two days I integrated three new variables: NDVI, EVI and Copernicus Land Cover. Since that moment my model doesn't go. I tried to cover the entire AOI with Modis and Copernicus Image with ....
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1
answer
38
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Creating line from 2 points in Google Earth Engine Python API
I try to create a lineString object from 2 points in using the Earthengine Python API:
point0 = ee.Geometry.Point([0,0])
point1 = ee.Geometry.Point([0,1])
line = ee.Geometry.LineString([point1, point0]...
- 2,650
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1
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18
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How to create a multiGeometry in EarthEngine
According to the documentation, earthengine supports GeometryCollection as MultiGeometry.
For testing purposes I would like to create one manually, but I fail to find the corresponding class in the ...
- 2,650
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votes
1
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37
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Earth Engine Zonal NDVI Stats Simulation
I am a beginner at GEE and I want to run a simulation where I calculate some zonal stats for NDVI for a bunch of random points within a specified region of interest and plot them on a histogram. This ...
1
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1
answer
29
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Make a time series plot of NDWI based water area extraction
I want to make a time series of NDWI based extraction of water pixels using Google Earth Engine. I can successfully make the mask but I am not able to code it properly to store the values of water ...
0
votes
1
answer
20
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EarthEngine: how to change pyramiding policy to mode for a "sum" reduction?
I am trying to do a simple "area of deforestation per year" computation in GEE, that is, applying a grouped sum reducer of a "year of deforestation" variable coming from the ...
- 1,981
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2
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24
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how to transform a doy band into a date in specific format?
Let's Assume I have a "doy" band in my ee.Image e.g. an integer from 0 to 365. I know the year as well (2023).
It's a typical case when dealing with deforestation alert system.
I would like ...
- 2,650
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1
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27
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How to check if a featurecollection have empty geometries
I try to export a FeatureCollection to my assets, this featurecollection is build as such:
surface_deforested_coffee = ee.Image.pixelArea().divide(10000).multiply(deforestation_total)
res_existing = ...
- 2,650
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1
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25
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Error exporting the mean of an Image List (of 173 Elements)
I am trying to export the LST mean for a period of time. I converted the Image collection I had to a List, but I cannot calculate the mean of all the elements within the List so there is only 1 image ...
0
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1
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22
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Spatial Analysis and Value Comparison in Google Earth Engine
I'm currently working with Google Earth Engine and coding some analysis. The task at hand involves working with two images. Initially, I want to select all values greater than or equal to a specific ...
- 29
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33
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Retrieving concentration values from Google Earth Engine
I am using a chlorophyll-a algorithm to retrieve chlorophyll-a and turbidity concentrations using different algorithms for a lake using Sentinel 2A (S2_SR). How can I determine the output ...
- 41
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1
answer
26
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Using existing GeoTIFF as training points for random forest classifier (Landsat 7)
I am new to R and GEE. I am trying to establish a link, using time series analysis, between land use change (different classes) and evapotranspiration (if possible also temperature, precipitation and ...
1
vote
1
answer
15
views
Indexing error in list in gee [is not a function)
how do I access an element from a index. I have created a list with feature and I want to access them and I am using .get function. However after getting .get it is returning error that it is not a ...
- 11
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25
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SVM and KNN variable Importance Factor getting error in GEE
I have done RF, BRT and CART variable importance factors in GEE, but I faced errors in svm and knn. Here is the code
/////RF_importance/////
var rf_dict = classifier.explain();
print('Explain:',...
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0
answers
24
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Empty results when using sampleRegions
I have a list of multiple raster images, from which I want to select different bands from each image. Then I also have a list of coordinates, and I want to get the results for all coordinates across ...
- 101
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1
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17
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Create a point that represents the maximum raster value (elevation) within a polygon: Google Earth Engine
I have around 300 polygons spread across a large area and wish to create a set of points, one for each polygon, that represents the maximum elevation value along the edge (or within) the polygon.
I ...
- 157
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1
answer
52
views
How to deal with the blank areas in Landsat images of a large area for one year
I am a beginner with Google Earth Engine (GEE). When I select a large area of interest to obtain Landsat 8 imagery in GEE, I find that even when I use a whole year's data, the final image still has ...
- 1
0
votes
1
answer
59
views
How to do post-classification / eliminate isolated pixels in Google Earth Engine
I am trying to apply post-processing (Classification Sieve) in GEE to my classified raster, just as we apply in QGIS (used 4x4) or (8x8). Remove unwanted and noise pepper effects from the ...
- 103
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votes
1
answer
27
views
How to extract HYBAS_ID values from the WWF HydoATLAS Basins feature collection?
I am using the HydroATLAS feature collection in Google Earth Engine to work with watersheds in a region of interest. Here is an example:
// Load watershed boundaries
var basinATLAS = ee....
- 5
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1
answer
21
views
Image export is 0 - 0 GEE NDWI
Why does this code export result in a 0-0 range in the TIFF image? This is from a youtube author (https://www.youtube.com/watch?v=U8qrOc9zaaE).
//Download & Visualize NDWI image using Landsat 8
/...
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1
answer
39
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GEE: "Earth Engine Memory capacity exceeded" when Exporting Images
I tried running my code without exporting to drive and it works fine with no errors. But as soon as I add in the block of code that exports images to drive, I get a bunch of messages saying "...
- 17
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1
answer
89
views
Random forests Google Earth Engine
I have been trying to train a random forests algorithm to sort of predict fire occurrences, using MODIS fire occurrence data as an outcome variable and elevation, distance from urban areas, air ...
- 11
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1
answer
75
views
Map a function with multiple arguments over an ee.ImageCollection in Google Earth Engine
I'm building a Python function for Google Earth Engine that takes two arguments: image is an input ee.Image and fields is an input ee.FeatureCollection. The function uses these two arguments to return ...
- 1,104
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1
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26
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How to create charts from LandTrnder function in GEE
I ran the sample code found here: https://emapr.github.io/LT-GEE/lt-gee-outputs.html, which is supposed to generate an array of results:
[
[1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,...
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vote
1
answer
49
views
Extracting filtered NDVI proportions from polygons
I have a dataset with several polygons in which I have to guess the proportion of bared soil. My ideal approach would be to use NDVI data where I select NDVI under, lets say, 0.3, and then calculate ...
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1
answer
24
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Softwrap in Google Earth Engine like Atom
Is it possible to activate any option in the Code Editor of Google Earth Engine similar to 'toggle softwrap' in the software Atom?
I mean, for long lines of codes that automatically continue in the ...
0
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0
answers
34
views
Missing Landsat 8 Surface Reflectance Data [duplicate]
I was downloading surface reflectance data from GEE from March 1st 2017 to October 31st 2017. I should be getting data every 16 days because of the nature of Landsat 8. However, there is no data in ...
- 1
0
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1
answer
30
views
Better way to pass server-side info to export filename?
I'm trying to export many images I made in one go but since everything is stored as earth engine objects, I don't know a good way to pass information into the filename portion besides using .getInfo() ...
- 17
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vote
1
answer
36
views
Understanding Recursion in Google Earth Engine
I have a simple recursive function and would like to understand why it results in an infinite loop. I thought it would terminate immediately because I'm passing in the number 0. But instead, it seems ...
- 17
1
vote
1
answer
43
views
Layers not getting displayed using Map.addLayer in GEE
I am writing a code to classify glacier features using various masks. The problem however is that none of the processed images are getting displayed. They are getting processed and the 'print' ...
0
votes
1
answer
56
views
Missing Landsat 8 Surface Reflectance Data From August 2017
I was downloading surface reflectance data from GEE from March 1st 2017 to October 31st 2017. I should be getting data every 16 days because of the nature of Landsat 8. However, there is no data in ...
- 1
0
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1
answer
47
views
Stopping condition in Google Earth Engine
I haven't been able to find much on this - likely because GEE prefers the use of .map and such. However, I have an inherently iterative problem. At a high level, I just need to iterate through a list ...
- 17
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0
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138
views
Harmonized Sentinel-2 Landsat
Recently, I recognized a new dataset in Google Earth Engine called the HLSL30: HLS-2 Landsat Operational Land Imager Surface Reflectance and TOA Brightness Daily Global 30m. I am wondering about the ...
- 21
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1
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71
views
How can easily I convert polar coordinates (using an arbitrary location as the "pole") into latitude and longitude in Google Earth Engine? [closed]
Let's say I have an arbitrary point marked by WGS84 lat/lon. From that point, I measure the distance (in meters) and direction (as an absolute bearing from true north) from that waypoint to the ...
- 393
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0
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34
views
Unknown reference to value named ''. Currently known value names are: []
I'm extracting an imagecollection with to drive with this function :
var batch = require('users/fitoprincipe/geetools:batch');
var output_folder = 'Modis_tiff';
// Export collection image to Drive
...
1
vote
1
answer
28
views
Error when trying to transform ee.Image to vector with Python
I am trying to transform some weather ee.Image to vector format. For context, my final goal is to export data as shapefile, read into GeoPandas and use it as input to a deep learning model, so there ...
- 111
1
vote
2
answers
89
views
How to convert Float to Number in gee
I'm trying to calculate percentile 95th divide to percentile 5th but I have not been able to find how to do this.
var start = "2022-01-01"
var end = "2022-12-30"
var dataset = ee....
- 51
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1
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148
views
Total request size (537871149 bytes) must be less than or equal to 50331648 bytes
I try to export images from an image collection in .tif by using this code.
https://colab.research.google.com/drive/1dfIoK5stZcFrtfGDsFLhxIV_VrJNZlxM?usp=sharing
When doing this I got the following ...
1
vote
1
answer
75
views
Calculation of percentile and use it in formula
I'm trying to calculate percentile 95th and 5th for NDVI
I can put the 95th percentile and 5th percentile manually, but I want to do it automatically, that is, Google Earth Engine itself will extract ...
- 51
0
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1
answer
51
views
Error exporting GeoTIFF to Google Drive - Google Earth Engine
I am trying to export a GeoTIFF to my Google Drive, but this error occurs -
Error: Image.clipToBoundsAndScale, argument 'input': Invalid type. Expected type: Image. Actual type: ImageCollection. (...
0
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1
answer
77
views
How to fix "If one image has no bands, the other must also have no bands"
I want to divide every image to 10000 then change the negative values in every pixels of a image to zero from (2015-01-01) to (2016-12-30) but when I am trying to run this code
it gives me this error:
...
- 51