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Questions tagged [classification]

The process of sorting or arranging entities into groups or categories; on a map, the process of representing members of a group by the same symbol, usually defined in a legend.

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12 views

Wrong pallete in Gradient Tree Boost classification

I'm using GTB to classify LULC, and when I'm trying to visualize the image it looks like this: //Gradient Tree Boost Classification var classifier = ee.Classifier.smileGradientTreeBoost(500).train({ ...
1 vote
1 answer
274 views

Locations From image.sample() are Different From Input Data in Google Earth Engine

I found an issue that the locations of the sampled points from ee.image.sample() do not match the locations of the input points. Above, the image is extracted MODIS 1km band, and the red points are ...
1 vote
2 answers
2k views

SCP QGIS Training input is not loading?

I am using QGIS, version 3.10.14 and the semi-classification plugin and want to create a training input, to classify different land-use-types. I followed the manual (https://readthedocs.org/projects/...
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1 answer
731 views

Layer error: No valid training data were found

I am creating soil land use classification through the use of ee.Classifier.smileCart(). I created the variable training, but I got an error: Layer error: No valid training data were found. // This ...
7 votes
1 answer
3k views

Results of Variable Importance of RF Classifier in GEE

I create a RF module in GEE like this: //Random Forest Result Function Module exports.getRfResults = function(image, title, bands, trainPoint, testPoint, area, label) { //Create Sample Points ...
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1 answer
15 views

Supervised classification ALOS-PALSAR Google Earth Engine

I need to create a supervised classification for flood detection with ALOS PALSAR in Google Earth Engine. How can I do this?
1 vote
1 answer
484 views

Semi-Automatic Classification Plugin Problem - No band encountered

I am new to the Semi-Automatic Classification Plugin. I am currently trying to produce Land Surface Temperature maps using satellite images (Landsat8) from Earth Explorer. I have downloaded the B10, ...
1 vote
1 answer
497 views

Predict classification probability of pretrained Random Forest in GEE

I'm running examples of binary classification in Google Earth Engine with ee.Classifier.smileRandomForest, and I saving the models to apply them later using ee.Classifier.decisionTreeEnsemble. My ...
1 vote
2 answers
530 views

Train Images Classifier - OTB Spatial reference of input and samples don't match

I am running the Train Images Classifier on OTB 7.1.0. I used QGIS to upload a raster images and then created a vector polygon file for my classes. I ensured that both the raster and vector files are ...
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21 views

Use a mosaic image of aerial imagery with the classification wizard in ArcGIS Pro

I've been trying to run the classification wizard tools in ArcGIS Pro with a mosaic of 4 aerial multiband images. I have all the licenses to do so and the mosaic image is multiband. I'm able to run a ...
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1 answer
257 views

Classifying land use in polygons using aerial imagery

I am trying to use the shapefile here: https://environment.data.gov.uk/DefraDataDownload/?mapService=EA/HistoricLandfill&Mode=spatial to work out how much of the sites are covered in trees. I ...
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1 answer
2k views

SCP Plugin for QGIS 3.16.7 Error 'raster is not loaded'

This is more of a FYI than a question... I'm running SCP (semi automatic classification) 7.10.4 plugin to QGIS 3.16.7 under Windows. I struggled quite a bit with the following roadblock: Create a ...
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1 answer
251 views

GEE OBIA - Non-zero error margin

I am trying to run this code and keep getting the error: "Classified objects: Layer error: Collection.geometry: Unable to perform this geometry operation. Please specify a non-zero error margin&...
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10 views

How to set the block size parameter for prepare a high point-density PointCloud dataset for training a model with ArcGIS Pro

I have a mobile point cloud dataset with following information: point density: all returns 126.91 last only 117.75 (per square units) Point spacing: all returns 0.09 last only 0.8 (in units) For ...
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8 views

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,...
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23 views

Training Samples Manager in ArcGIS Pro takes each polygon as a class

I am trying to create segmentation on satellite image I have. I have something like 1000 polygons to use for training and I'm using the Classification Wizard. I have uploaded the sample polygons, but ...
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12 views

Merging non-overlapping classified rasters with varying nb of classes

In ArcGIS Pro 3.2, I have several tiles of 1km² as composite rasters (4 bands+NDVI+NDVIre+DSM). I classify each tile independantly with SVM and segmentation, using a training scheme with 8 classes. ...
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1 answer
275 views

What's the use of ImageCollection.errorMatrix() in Google Earth Engine?

In the docs there are two versions of the errorMatrix function: ee.FeatureCollection.errorMatrix and ee.ImageCollection.errorMatrix I've been sampling points from my classified images to create error ...
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1 answer
30 views

Using large datasets for training in Google Earth Engine

I created a training dataset using polygons outside of GEE and I want to use them now in GEE for a supervised classification in Sentinel-2 images. However when I try to create training points from it ...
1 vote
1 answer
30 views

Apply symbol from one category to other categories and retain color already set

Is there a way to apply or change a symbol of one category to other categories without changing the already set color in the QGIS symbology window? After setting up a symbol, I can change the color by ...
-1 votes
1 answer
65 views

Link drive folder to gee: Display tiff images from drive to gee

I have classified images using many different programs on gee and exported a series of classified images to a folder on my drive. I don't know how I can link that folder to gee so I can display the ...
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1 answer
176 views

Error using 'extract' to extract landsat pixel values from training data

I'm getting an error with a line of code that I've run successfully in the past. My goal is to extract landsat pixel values from training data polygon shapefile for classification. Here's my code up ...
1 vote
1 answer
269 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 ...
4 votes
1 answer
100 views

Sorting Classification by another field

I am currently using the QGIS software. I use rule-based classification to extract the monetary values from a field and display them as symbols. For map legend purposes I need to concatenate the ...
1 vote
0 answers
34 views

Classify vector layer by area quantiles in QGIS

I have a vector layer with aroud 400 features, each having an assigned value (here displayed as a label). I want to classify it into 5 groups (10%/20%/40%/20%/10% of the total area) based on the ...
0 votes
1 answer
236 views

Creating random points based on a classified raster WITHOUT detour via raster-to-vector-conversion (QGIS 3.16, Win10)

I'd like to create a random-point-vector-file from a classified raster with a given number of points per class. I found several solutions or tool recommendations in diverse forums. But, all these ...
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61 views

Random-points-from-Classification tool (EnMAP-Box plugin) - Adding mask option by python? (QGIS 3.16, Win10)

I created random-point-vector-files from a classified rasters with a given number of points per class by the Random points from Classification tool (EnMAP-Box plugin). But, now I'd like to exclude ...
2 votes
0 answers
61 views

Doing simple manual classification of LAS using QGIS

Are there any basic tools for lidar classification in QGIS? Id like to do simple function like reclassing single points, classing points inside a fence or above a line. something similar to the basic ...
2 votes
1 answer
902 views

Multi-temporal classification in Google Earth Engine - clustering and grouping based on time sero

I am working on my master thesis on multi temporal classification of LULC using S2 imagery in Google Earth Engine. The goal: to distinguish urban area from the landscape in the Inner Niger Delta. ...
1 vote
1 answer
898 views

Errors when uploading image to Earth Engine directly from the Cloud Storage bucket

I wanted to upload the image to Earth Engine directly from the Cloud Storage bucket with the earthengine command but encountering some errors !earthengine upload image --asset_id={OUTPUT_ASSET_ID} --...
0 votes
1 answer
63 views

QGIS and percent values in slope map

I create a slope map from a DEM downloaded with SRTM Downloader in QGIS 3.32.0-Lima. I searched in the internet trying to find the way to interpret the values of the left column in percent. For ...
3 votes
2 answers
235 views

Error occurring when converting to dB during the python-based classification

I am trying to perform an object-based classification using a python-based script with rsgislib. Although, when converting to dB, an error is appearing. Any ideas why is this happening? Create and ...
0 votes
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15 views

Affect on classification for two different Sentinel images taken at the same time with slightly different color values

I am running a supervised land-use land-change classification across multiple Sentinel images. These images were taken at the same time of different but overlapping areas. However, despite being taken ...
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18 views

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 ...
1 vote
1 answer
166 views

Assign raster's pixel values to a new column

I want to use a landcover raster for further training in GEE. This raster has different pixel values for different landcover classes. However, I want to assign those values in a new column to use this ...
1 vote
1 answer
718 views

Calculating number of plants on orthophoto [closed]

I have orthophoto map of agricultural field and I need to count plants there. I have also multispectral map (NDVI) but I think it's not very usable here. I know the best would be to have point layer ...
0 votes
1 answer
36 views

Difficulty displaying custom LAS attribute in ArcGIS Pro symbology

I have computed a vegetation index for my point clouds and have added it as a new attribute to my LAS file, and saved the updated las file using the following code- lz <- readLAS('x.laz') rgb <- ...
1 vote
1 answer
193 views

Export band value range of one landcover class after Random forest classification

I have classified my study area into six landcover classes (water, urban, barrenland,plantation, nonmangroves forests and mangroves) using Random Forest. I used six bands for classification (red, blue,...
0 votes
1 answer
49 views

Plotting Sentinel-2 Level-2A Scene Classification in GEE

I am interested to visualize the result of Scene Classification (SC) that is automatically performed during the production of level-2A products. I am using GEE. I have read this page and this page and ...
1 vote
1 answer
306 views

Failing at using 'Zonal Statistics As Table' to calculate the number of pixels per class, for each individual area (19 total) of a classified raster

I am using ArcGIS Pro 10.2.9. I have a raster. I used a polygon feature class (19 rows of data) to clip the raster into 19 distinct areas, some of which abut each other. I classified the clipped ...
2 votes
2 answers
392 views

Maximum Likelihhod Classification - Error 010108 and Error 010067

I'm trying to run a supervised classification on a Landsat8 multi-band raster in ArcMap. Every time I run the classification, it returns Error 010108 and Error 010067. The 010108 error says The number ...
0 votes
1 answer
427 views

Export as CSV after using for loop in GEE

I'm trying to use the for-loop function for a supervised classification over several dates. I have trouble exporting the accuracy metrics that are useful to me in a single CSV file. With my code I can ...
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0 answers
24 views

Random forest invalid data

I'm trying to classify forest habitats at a 10-meter resolution. I have imported my points from a shapefile that contains habitat categories for each sampled point in the "target" column. I ...
1 vote
1 answer
558 views

SVM Classifier Probability Output is Opposite of RF and CART Classifiers using Google Earth Engine

I am working on a Peatland Fire Fire Susceptibility Determination on GEE using three classifier algorithms: RF, CART, and SVM. The outputs are fire probability and binary classification (1 = fire, 0 = ...
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31 views

Band not recognised - seagrass mapping on GEE

// Load Sentinel 2 raw imagery and filter it to all images in 2023. var S2data = ee.ImageCollection('COPERNICUS/S2_SR') .filterDate('2023-05-01', '2023-08-01') .filterBounds(poi) .filter(...
0 votes
1 answer
1k views

Classification: Layer error: Property 'Class' of feature '2_0_0' is missing:

When I was trying for LU classification, I am getting an error: Classification: Layer error: Property 'Class' of feature '2_0_0' is missing. What is the reason for this error and the solution? var ...
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0 answers
17 views

Multitemporal supervised classification with spectral signatures in GEE

I need to run a supervised classification on GEE using Landsat image about a determined date with the spectral signatures derived from a image of another year but same month. Is it possible?
0 votes
1 answer
152 views

Symbology Class Editing Options Greyed Out

I am trying to add a symbology class to a layer but the options are greyed out. I believe it has something to do with the warning that says "primary symbology relies on one or more fields that ...
1 vote
1 answer
53 views

Error - Missing property in a classified image

I am trying to classify a Sentinel 2 image composite with some added index bands using Random Forest supervised classification on a collection of sample points generated from a source Dynamic World V1 ...
0 votes
2 answers
438 views

Error Executing Maximum Likelihood Tool

I am attempting to create Supervised Land Cover classification maps using the classes (Mangrove, Non-Mangrove, Barren, Urban, and Water) for four period of interests (1988, 2000, 2017 and 2020) using ...

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