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Questions tagged [image-classification]

Image classification refers to the task of extracting information classes from a multiband raster image.

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Computation Timed Out Error in Google Earth Engine [closed]

I'm new to GEE. I am trying to use random forest classification to identify solar panels in a region of Brazil using a Landsat 8 median image and derived bands. However, the dataset seems to be too ...
Juan's user avatar
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Image Classification Wizard: Error Message

After classifying the image into impervious/ pervious surface areas and applying a supervised classification of the different features, I tried to run the Image Classification Wizard. This is the ...
CatchE's user avatar
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What is the optimal number of samples in a random forest classification?

I am conducting a supervised classification as part of a LULC analysis. I have 8 classes with sample sizes maxing at 500. However, I am still seeing some misclassification and want to add more classes,...
Ceiba's user avatar
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Format error training algorithm for image supervised classification - Google Earth Engine python API in QGIS

I am using Google Earth Engine python API in QGIS to try and run a supervised classification of an aerial image. I started working on a GEE guide on supervised classification, but there seems to be a ...
Tom John's user avatar
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How to differentiate between bareland and crop land while supervised classification?

I am performing supervised classification in Sentinel 2A 10m resolution image using Arcgis 10.5. The area for which I am doing classification mostly contains built up areas, very few bareland and I ...
Monika Jirel's user avatar
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Google Earth Engine Classification Collection Mode Frequency for pixel confidence/stability/agreement

I am trying to obtain the mode and the mode frequency per pixel of different iterations of a Random Forest Classifier (With a fixed number of trees but with different random seeds) with 5 classes (0 ...
Daniel Aguirre Nieto's user avatar
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ArcGIS classification and accuracy assessment NoData class and error generating accuracy points

I'm trying to classify a clipped Landsat raster and then do an accuracy check for a watershed. When I do classify my clipped watershed, the region outside the ROI also gets classified i.e. the NoData ...
ManishaSingh12's user avatar
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Exporting an image collection as an asset

Is it possible to export each image from image collection as an asset? If yes how can I improvise this code? // set cloud threshold var cloud_thresh = 40; // Cloud mask function var ...
Bibek Haudi's user avatar
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Classification in ENVI

I classified multiple images using ENVI modeler and I would like class statistics for each image. Is there a task available in ENVI modeler that can do this? I know I can right click each image and ...
Micaela's user avatar
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How to extract random points from a list of polygons in Earth Engine (classification accuracy assessment / "is not a function")?

I am working on an accuracy assessment for my classification and want to do this using random sampling of points from a validation part of my training areas. For this I split the training areas into a ...
pcf42's user avatar
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What data does clustering use from multiple raster files?

I currently have a series of rasters of the same area across different times. The data is categorical: the product of a supervised classification used on LANDSAT data run on ERDAS Imagine. Each ...
Phil's user avatar
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Region of Interest selection error in Semi-Automatic Classification Plugin (Error: unable to calculate)

Yesterday I upgraded the Semi-Automatic Classification Plugin. Immediately after doing this, the automatic ROI selection is giving me that error as shown in the attached image. I have tried to ...
Aim Banda's user avatar
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Error in preview of classification in QGIS

While doing LULC classification I am facing the following problem in QGIS. I am unable to do the following process. After selecting all the training inputs, I select classification in band-processing ...
Dibyendu Biswas's user avatar
2 votes
1 answer
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GEE Classification Error Multiple Geometry types

I came to the issue of Out of Memory Error when I tried to do a supervised classification of an image using a shapefile polygons as underlying featureCollection in GEE. It turned out that some of the ...
Sina NAKHOSTIN's user avatar
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Apply Sieve in Google Earth Engine

Without applying a filter function like the mode or similar, I want to apply a sieve to a raster with two classes. Let's say I have a raster with pixel values 0 and 1; I want to remove groups of ...
Isa's user avatar
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Object-based classification issues on ArcGIS Pro

I am currently building a predictive wetland layer using Sentinnel-2 bands (RGB and Infrared), and several LiDAR derived datasets. I made a 8 band composite and have been training the model using the ...
Erioderma's user avatar
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Train images classifier not working on orthomosaic GeoTIFF file

When I run the train images classifier on an orthomosaic or orthophoto by OTB in QGIS it generates me not just a file with .txt extension but by default it starts generating .txt.shp, .txt.shx, .txt....
ibex's user avatar
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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 ...
Shumaill's user avatar
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How to Fix: Layer error: Computed value is too large in Google Earth Engine

I conducted a landcover classification, distinguishing between mangrove and non-mangrove areas. For each landcover type, I gathered fewer than 10 samples. I utilized Random Forest (RF) for ...
Edudzi's user avatar
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Image Overlay for Classified Images

I created 5 classified images for year 2019-2023 as shown: - Fig: Classified image of Sentinel-2 for 2019 I have also prepared the classified image for 2020, 2021, 2022, 2023 like above. The ...
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How to enable the image classification tool in ArcGIS

I intend to perform a supervised classification on a TIFF image in ArcGIS 10.8. The image is an imagery of an area which I downloaded from my ArcGIS Online account. The goal is to automatically ...
Tsaku Graham's user avatar
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How to use Spectral Temporal Metric (reducers) in Supervised Random Forest Classification in GEE

I am trying to improve image classification in GEE by using the STM of the mean. I first calculated the mean of the four bands. Then I added the new column with mean to the image. Then I used the new ...
Ndahambelela's user avatar
2 votes
1 answer
534 views

Supervised classification from collocated Sentinel 1 and 2 image

I was trying to perform a supervised classification of a mangrove forest using collocated sentinel 1 and 2 images using this code. With the help provided by @Xunilk, I finally managed to run the code. ...
Sakib Rahman Siddique Shuvo's user avatar
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Performing image classification with both a classifier definition file and a segmented image in ArcGIS Pro

I am performing object-based classifications in ArcGIS Pro in the form of two separate rounds of classifications. In the first round, I obtained a drone image and uploaded it to GIS, I manually ...
Matt Dupasquier's user avatar
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What do the values in trees of Random forest GEE mean?

I get these trees in GEE: trees: List (29 elements) 0: n= 116838 node), split, n, loss, yval, (yprob) * denotes terminal node 1) root 116838 31180 8 (0.010997 0.0066155 0.019316 0.013984 0.012195 ...
Ludmila VT's user avatar
1 vote
1 answer
82 views

GEE: Finding number of classified pixels for entire image collection (Sentinel 2)

I'm trying to calculate the number of pixels classified as ice for every image in my Sentinel 2 collection, but when I try to map my function over all the images, each feature in my test export has ...
Will's user avatar
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217 views

How to use existing polygon feature class as training samples in ArcGIS Pro Classification Wizard?

I have created a polygon feature class from field observations at specific locations. I renamed the attribute table field containing the classes to "classname" as this seems to be important ...
avaruus's user avatar
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1 vote
1 answer
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Perform the accuracy assessment after performing classification on an image collection in GEE

I have classify an image collection using Random Forest classification method by creating a function and mapping that function over image collection. Now, I am stuck with accuracy assesment. Because ...
Syed Ahmed Raza's user avatar
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1 answer
284 views

Accuracy assessment 0.99 Google Earth Engine

I've successfully run my classification using Landsat but my accuracy gives me 0.99 which might be too good to be true. Here is my script. What might the problem be? //Define AOI and predefined ...
Kanya Xongo's user avatar
1 vote
1 answer
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No valid data training when doing a supervised classification using training data from a different year

I'm doing a supervised classification using training data from a 2023 Image to a 2022 Image. However, when doing the migration I got the error message "No valid training data were found" for ...
Luis's user avatar
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Missing features in FeatureCollection in Google Earth Engine

I am working on a project where I cross-classify several regions with each other. In other words: I train several classifiers on imagery from different regions and classify all images of all regions ...
pottsbill's user avatar
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27 views

Apply single label image classification in Google Earth Engine

I am trying to apply single label image classification in Google Earth Engine in the context of Bragg Scattering. What I'm trying to do comes down to the following: Assign a single label (e.g. Bragg ...
Cato van Meurs's user avatar
1 vote
1 answer
218 views

Google Earth Engine: How do I create a feature collection with bounded, randomly-assigned classes?

Here's an example script: https://code.earthengine.google.com/d511144dde609f4cf1fd8607499e2026 I would like to create a set of random points with random classes to use as training data in order to ...
Matt's user avatar
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Classify pixels using deep learning model outputs blank raster

I have been attempting to classify 0.5 m resolution imagery for my research. Unfortunately, when I go to run the "classify pixels using deep learning tool", I get an output with no errors, ...
goodson36's user avatar
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1 answer
339 views

QGIS dzetsaka plug-in for satellite image classification error how to do?

When I used dzetsaka plug-in of QGIS to process the SAR image of Gaofen No. 3 satellite, I wanted to use Gaussian mixture model and random forest for classification according to the different ...
chiyi y's user avatar
2 votes
0 answers
124 views

Classify georeferenced image based on colour in QGIS

I have a georeferenced image (attached) that I want to classify into a raster, where raster values correspond to the colours in the image. Low (green) = 1 Medium (yellow) = 2 High (red) = 3 All other ...
Stuey17's user avatar
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Calculate accuracy assessment for MNDWI classified image (Overall accuracy, Kappa)

I want to find a way to calculate the accuracy assessment for a classified image (classified by mndwi threshold). I already had the classified image and the reference water body in shapefile format ...
Minh Vu Anh's user avatar
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106 views

Band Combination for NIR-R-G in Landsat 7 scene

What is the order for the band combination to show Landsat7 scene in NIR-R-G Band? The band combination I used is:- And the result generated is:- Is this the correct layer combination to show ...
Walker's user avatar
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Classify Land Use Land Cover

I am asked to classify an image (Landsat 7 scene) for 2 different time period one for the month of July (Image 1) and the other December (Image 2) as shown below. Image for the month of July Image ...
Walker's user avatar
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1 vote
1 answer
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Classifying Object Based on Mean IR Values

While Developing rule sets using e-Cognition for object classification for say; Landsat 7 images what are the threshold conditions to classify water, building, agriculture land & bare soil ...
Walker's user avatar
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1 answer
19 views

How do I ignore artificial landscape (e.g., pavement, cars, buildings) in order to classify features of the natural landscape (e.g., veg cover, soil)? [closed]

I want to classify the landscape into different classes, in order to identify areas with low veg cover and bare soil. Unfortunately, any of the classification tools I use will recognize pavement, cars,...
USJoeS's user avatar
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0 answers
48 views

Supervised Classification gives "Directory(error)" ans "SR_B1" missing error in GEE

I am trying to run supervised classification on single date, cloud free, Landsat 5 collection 2 level 2 image. I have imported the point shapefiles of different classes with class values and have ...
Kiran Choudhary's user avatar
2 votes
1 answer
128 views

Classify the image by a field in its attribute table using QGIS software

I created the attribute table of raster data in ArcMap software. There is a field that I added in the attribute table that I created. I can reclassify the image using the field I added to the image's ...
emre's user avatar
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2 answers
163 views

Issue in applying condition expression to all band values in Google Earth engine

I want to apply the following condition statement to all the pixels of an indices image having only 1 band. The condition is as follows- For that first I have calculated the mean value of my image. ...
soumik chakraborty's user avatar
1 vote
1 answer
221 views

Is there a way to obtain the variable importance for a specific class in Earth Engine?

I used a .smileRandomForest() and I know that by calling .explain() you can see the relative importance of the variables for the general classification... but I would like to know which inputs ...
M_LeonPerez's user avatar
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1 answer
221 views

Using values of a groups of objects to create an image in GEE

I have calculated the 90th percentile for each class of land cover using the reducer ee.Reducer.percentile([90]).group The result is a group of objects and I don’t know how to use it. I would like to ...
Anto260783's user avatar
1 vote
1 answer
110 views

R RStoolbox not picking up a SpatialPolygonDataFrame as a Polygon

I am trying to perform a supervised classification via RStoolbox. I am using a SpatialPolygonDataFrame as the training data. Now, even though rgdal picks up the polygon, RStoolbox returns an error. ...
Arthur_Morgan's user avatar
0 votes
1 answer
359 views

Calculate transition of different NDVI classes from pre and post NDVI in Google Earth Engine

My competency in GEE is quite low. I have calculated 2 NDVI layers (pre and post-disturbance NDVI). I have separated these NDVI layers into 4 classes according to NDVI values. Now I need to calculate ...
Mohammed7's user avatar
0 votes
1 answer
241 views

Google Earth Engine: summary statistics of an image by another image classified

I want to summarize the value from one image by the label provided by another classified image which only with two labels. But the reduceRegions function needs the FeatureCollection to provide the ...
ChuDingjin's user avatar
1 vote
0 answers
111 views

Fatal error using orfeo toolbox (otb 8.0.0) algorithm Computeconfusionmatrix in QGIS 3.22

I tried to compute a confusion matrix of a raster classification with otb's Computeconfusionmatrix using vector data (polygons) as reference input. When I run the same algorithm in mapla (otb ...
Mirje's user avatar
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