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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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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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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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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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
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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 ...
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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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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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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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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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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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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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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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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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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
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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, ...
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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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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
154 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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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
180 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
45 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 ...
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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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210 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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73 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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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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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 ...
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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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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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3 answers
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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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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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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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50 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
68 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
117 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
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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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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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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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0 answers
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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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1 vote
2 answers
142 views

Classification using Google Earth Engine JavaScript API

I am trying to classify the Bostanliq area of Uzbekistan. Everything is fine unless my final result does not give Forest even though I collected many samples for that class of land. My code: var ...
Bokhir Alikhanov's user avatar
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40 views

Blank classification output in Google Earth Engine

I tried to classify the Landsat images from 2013 to 2022 using the random forest classifier. I have used the below code which has been modified from the one available here. The original code was for ...
Pratibha 's user avatar
3 votes
1 answer
131 views

Classify vegetation by height

Trying to further classify a las catalog that already has buildings, bridges, noise and ground classified. I want to break the unassigned points into vegetation classes by height but can't get it to ...
pseudotsuga's user avatar
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1 answer
60 views

Change the order of my raster based classification

I am having troubles switching the order of my classifications of my raster, which originates from R language and imported into QGIS. In the attached image I am trying to switch around my grass and ...
Aaron_Elph's user avatar
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16 views

Radiometric standardization for Landsat5 and Landsat8

I'm currently encountering an issue with classifying LULC. The first image I have is a false color composite taken in 2020 using Landsat 8. However, the second image, captured in 2010 using Landsat 5, ...
Jubier 's user avatar
1 vote
0 answers
178 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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63 views

FeatureCollection (Error) Array: Max (NaN) cannot be less than min (NaN)

I am trying to do Object base Image classification, but my code giving me this error, I tried to fix it but nothing worked. This is an error, "FeatureCollection (Error) Array: Max (NaN) cannot be ...
Muhammad Waqas's user avatar
1 vote
1 answer
30 views

Showing data in increments on map using ArcGIS Pro

Let's say I have a feature class with numerical values say age greater than 0 and so on. How can I show them classified them in such a way that these values are shown in increments of 20 on the map in ...
Arthur_Morgan's user avatar

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