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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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Classifier training failed: 'Only one class.' in GEE

I trying to run random forest on my study area with a number of created polygons with different class values.In spite of that, the error is coming--- Classifier training failed: 'Only one class.'.Here ...
Payel Ghosh Dastidar IRRI IN's user avatar
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23 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({ ...
Reza Pranata's user avatar
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1 answer
20 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?
Paula Torres's user avatar
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24 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 ...
DecentShapefile.pdf's user avatar
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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 ...
Anahita Kp'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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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 ...
ReutKeller's user avatar
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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. ...
JeremieT's user avatar
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1 answer
101 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 ...
MNgoc's user avatar
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1 answer
31 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 ...
basto's user avatar
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1 answer
66 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 ...
rrwork___'s user avatar
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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 ...
Ernst's user avatar
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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 ...
t3ahunt3r's user avatar
2 votes
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82 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 ...
LidarBeaver's user avatar
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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 ...
Ceiba'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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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 <- ...
Sonali Sharma's user avatar
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81 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 ...
Sina NAKHOSTIN's user avatar
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25 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 ...
Ecostudent's user avatar
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19 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?
Leo Lizárraga's user avatar
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1 answer
234 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 ...
Bear's user avatar
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1 vote
1 answer
58 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 ...
Kirill Ivanovskiy's user avatar
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1 answer
79 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 ...
Joseph's user avatar
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Interactive supervised classification tool greyed out

I'm using ArcMap to perform a classification. The problem is in the classification wizard, all tools like maximum likelihood classification and other are still available except the interactive ...
amina k's user avatar
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51 views

Zonal Statistics in QGIS

I am using raster layer zonal statistics in QGIS. I want to quantify the water yield contribution of each LULC class, but the results of the zonal statistics is greater than the value given by the ...
ccquinon's user avatar
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82 views

QGIS SCP Error When Classifying Landsat 5

Good day! I am trying to classify a landsat 5 collection 2 level 2 image of my study area, but when I start the classification process after selecting the ROIs an error occurs. UnboundLocalError: ...
ccquinon's user avatar
2 votes
1 answer
580 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, ...
Izzy's user avatar
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32 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(...
Defne's user avatar
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1 answer
63 views

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 ...
MONICA MANUELA CORREIA's user avatar
1 vote
1 answer
261 views

Reclassify points in a LAS file using laspy

I am trying to change the classification of all points in my las file above a certain height (z value) from 2 (ground) to 1 (unclassified). I wrote the following code to do this: las = laspy.read(&...
Tahrir Siddiqui's user avatar
1 vote
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40 views

QGIS Classifications on 10km^2 square grid

I am new to QGIS, and I have a problem that I don't know how to solve: My goal is to have a 10km x 10km square grid of Europe where each cell of the grid is classified by land use. With just a few ...
Philip Schmid's user avatar
1 vote
1 answer
297 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' ...
Ayushi Sharma's user avatar
1 vote
1 answer
46 views

Select legend items in ArcMap

I have classified class interval with pixel value (i.e. >1 & < 0 ) as Non-Bamboo area after excluding these values in image classification. However, these classes appear in 2 rows in legends ...
Pushkar's user avatar
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1 answer
111 views

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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1 answer
326 views

Calculate area under each class for a feature in a shapefile

I have a shapefile that you see in attached picture and you can see it has eight classes for a feature shown in picture. How do I calculate area under each class. I would like to export area ...
QGIS_krig's user avatar
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90 views

Google Earth Engine Error for random forest classification

I am working on random forest classification to distinguish corn areas, and defining train and test data but I faced an error. classification: Layer error: ErrorMargin, argument 'value': Invalid type....
bahare bahmanabadi's user avatar
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28 views

Image (Error) Property 'NDVI' of feature '0_0' is missing

when I was working on classification for crop mapping to find maize fields, I faced the error. I made samples using geometry and named it trainingdata which indicate maize fields. Besides I tried ...
bahare bahmanabadi's user avatar
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0 answers
15 views

losing classified values when converting from .tif to .asc (for Maxent)

I have 10 aspect values in a .tif generated by ArcGIS from a DEM file. When I convert to .asc (necessary for Maxent) it becomes a single value arc from -1 to 360(m). I need to use this as a ...
Tal_1's user avatar
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0 answers
19 views

Land cover classification of different acquisition dates

I am doing a land cover classification of a large area, therefore all the images over the area do not all have the same acquisition dates. This results in my output having visible borders: The images ...
GISJess's user avatar
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1 answer
52 views

Does Landsat satellite image should have raster value to -1 and 1?

I am calculating the NDVI for Landsat-8 using the formula as shown below:- But the pixel value rendered is as shown below: - But the NDVI values need to be between -1 and +1 however, the value ...
Pushkar's user avatar
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1 vote
3 answers
96 views

How do I classify contour lines on specific levels?

I have a shapefile with contour lines. When I go to classify it to decimeter interval it chooses some rounded off to for example 5,8 while 5,7 is classified by 5,70000001 or simliar. How do I go about ...
Igzie's user avatar
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1 vote
0 answers
45 views

Generalization of classified raster: reassigning class after Region Group and Nibble

I want to do a Generalization of classified raster in ArcGIS as it is described here: Generalization of classified raster imagery. The documentation includes following steps: 1. Majority Filter, 2. ...
Katrin's user avatar
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0 answers
93 views

How to classify points in LAStools using shapefiles as reference

I am new to LAStools, and mostly use MicroStation/Terra for classifications, except MS is a resource heavy at times so can be slow and can crash. The macro we run uses shapefiles as a reference, and ...
Warrick Allen's user avatar
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0 answers
59 views

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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1 answer
82 views

Random forest classification on QGIS gets stocked at 66% with an error message whose conditions have been met

I am running a random forest classification on QGIS using dzesaka pluggin, after picking my training sites and running the classification, it gets to 66% and a prompt message appears that i ensure ...
Nkogho Uchenna's user avatar
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1 answer
134 views

File not found, no such file or directory in GEE python

I follow step by step in : https://geemap.org/notebooks/33_accuracy_assessment/#split-training-and-testing When the step to download confusion matrix, there is error. I type the code : import csv ...
mega saputra's user avatar
-1 votes
1 answer
32 views

Join attribute table - 2 different layers - 2 different classifications (QGIS)

I have 2 vector layers, one containing cells on a municipality level and one containing a more detailed classification on a district level. Some municipality contain multiple districts, whereas other ...
Ann's user avatar
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0 answers
62 views

Get working of Random Forest in GEE in understandable form

I used this code to see decion tree in RF GEE: var decisionTrees = ee.List(trained.explain().get('trees')) print("Tree decision", decisionTrees) I get this: Tree decision List (29 elements) ...
Ludmila VT's user avatar
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1 answer
124 views

Merging training points for classification (Random Forest) using L9 data in Google Earth Engine

I am not able to merge training points using Google Earth Engine code. I am very new to Google Earth Engine. The code which is tried is var dataset = ee.ImageCollection("LANDSAT/LC09/C02/T1_L2&...
user28542's user avatar
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120 views

Semi-automatic classification QGIS plugin not responding

Trying to use search in Semi-automatic Classification plugin as part of QGIS and it is not responding. I have searched parameters for Bonn in Germany and dates from 2020-04-01 to 2020-05-07 with cloud ...
Nigel's user avatar
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