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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How to add the bands value from CSV file to Image Collection for Classification

I am currently working with GEDI data and Random Forest Classification in Google Earth Engine. I have a csv file which contains 42 bands and about 3600 points. My aim is to import this csv into GEE ...
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Ground Classification, without any classified data? (Laspy, Python)

I am trying to classify ground point in .las file. Points are never classified which is 0. I read something about, if the number of return is 1, we can declare it as ground. Is it true? las....
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Is there a way to filter out polygons/lines using geometry in QGIS?

I am currently working on a project to digitize utility data, however my input layer is not classified. I am currently using length of the features to filter out unnecessary lines/polygons. Is there a ...
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GEE Supervised Classification using Sentinel-2 to detect seagrass

I am trying to distinguish seagrass from seaweed (macroalgae) and ultimately map seagrass around Britain. I am aware it may not be possible because it is challenging to differentiate seagrass and ...
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Establish multiple thresholds with Otsu method in Google Earth Engine?

I am using the Otsu Method on dNBR imagery to determine optimal thresholds for burned/unburned areas. I'd like to take this analysis a bit further and try to establish thresholds within the burned ...
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nodata pixels in classified raster

first of all: this is the first research I'm doing using remote sensing data and therefore this is a very basic question: I'm doing a research regarding the classification of grasland use in the year ...
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Sampling random points over each class of a Classification in GEE

I performed an Unsupervised Classification in GEE and I have 3 classes. I need to create random points in each class in order to draw a histogram of spectral signature later. In line 150 of the script ...
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ArcGIS Pro Unique Values with Domains Does not Display Correct Number of Classes

This post may be overkill, but I'd like to see if anyone else has run into this and if they have a fix. I'm trying to get ArcGIS Pro (2.9.2) to symbolize linework where three fields use a domain (0=...
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SVM algorithm does not run in Google Earth engine

I am running a classification code in GEE and getting the following errors while trying to print Validation overall accuracy and mapping the classification result: > Number (Error) The service is ...
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Error with CART: Layer error: Property 'LandCover' of feature '1_1_1_1_0_0' is missing

I've been trying to run this code on Google Earth Engine, however I get the following error and I'm not sure how I can resolve this issue: //Set map centre Map.setCenter(159.9737, -9.4336, 12.5) //...
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Error in random forest classification for the GEDI datasets in GEE

I am a beginner in GEE. I am trying to do the random forest classification for the GEDI datasets (rh13 and rh99) in Google Earth Engine. I want to do the classification of each point of the GEDI ...
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Error while performing an Unsupervised Classification in GEE

I got the following error while performing the unsupervised classification as below: Unsupervised K-means Classification: Layer error: Output of image computation is too large (17 bands for 845340 ...
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Classification: Layer error: Property 'landcover' of feature '1_1_1_1_1_0_0' is missing, but print() does not show feature 1_1_1_1_1_0_0

I got this error when running the classification for classes 0-5 on an imported Sentinel 1 image via ee.ImageCollection. To debug this error, I did print(). However, print() does not show up feature ...
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Reclassifying vector attributes efficiently in QGIS

I have converted a raster file to vector and I am trying to create multiple attributes or levels, for my land classification. I have multiple values that are 101, 102, 103, 104 etc. where the 100 ...
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Creating CNN model for multi-class image classification using Google Earth Engine

I am trying to build a satellite image classifier CNN using Google Earth Engine. I have been following this tutorial: https://colab.research.google.com/github/google/earthengine-api/blob/master/python/...
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Classify using more than two condition in "Assing Class process" from Ecognition

I am trying to classify a shapefile in Ecognition. I want to use the process "ASSING CLASS", but this tool only permits 2 conditions, as the picture shows. Is there any other tool, or way, ...
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GEE training classification = not finding the training data

Still as an exercise I have selected the points for training classification but it keeps saying that Layer error: No valid training data were found. Any clues? Here is the link: https://code....
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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 ...
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Supervised classification using spectral signature without using any indices like NDVI for crop classification of two classes only

Code: var S2filtered = S2_2A.filterDate('2021-04-1', '2021-04-16') .filterBounds(roi) .sort('CLOUDY_PIXEL_PERCENTAGE') .first(); var S2clipped =...
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Vegetation classification for aerial photography in QGIS

What I need to do is to use QGIS, for vegetation classification of some older and newer Aerial Photography. In the past we have used ERADS Imagine but I have seen that there is some plugin developed ...
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Exporting a classified image in GEE without getting a BLACK raster image

I have been trying to export this classified image. I want my GeoTIFF file to show this view... But every time I export, my image turns out Black. after some digging i got to learn that I need to ...
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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 ...
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Evaluating classification accuracy and the result of kappa test in Google Earth Engine

I am trying to check the efficiency of the classification. The classification accuracy and kappa test for 2020 are 0 while for 2000 is 1. I am just not able to put my finger on what is incorrect as ...
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QGIS, Lines disappearing after classification

I want to create a shapefile with the geometry type Line. For this purpose I make a classification in the symbolization, because the lines are assigned to different meanings. For example: Value a --&...
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Manual classification combining bands and defining values in GEE

I would like to perform some manual classification on a single image of S1-data which is fairly simple: either a pixel is classified as 'Water', or it is classified as 'Land'. I did these ...
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Converting .tif image to classified polygon layer

My objective is to turn a .tif image layer (a classified map) into a a polygon layer (using the raster to polygon function) with the original map's classification scheme. The classified map contains ...
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How to integrate DSM elevation values into a classification scheme?

I'm in the process of attempting to create a corrected DTM for a UAV flight of a salt marsh. As part of this process I'm trying to integrate mean elevation values from each cell of a raster DSM into ...
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Google Earth Engine Classification with high-res. NAIP-Orthofotos

i try to perform a supervised classification with Google Earth Engine based on NAIP: National Agriculture Imaginary Progamm orthofotos. These images have a resolution of 1m in 4 Bands (R,G,B,N). I am ...
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Dynamic Category thematic map

I am working in QGIS 3.8.3-Zanzibar on a shapefile with polygons. I am zoning by selecting the polygons and giving each group a different number (a zone code). In order to visualize it, I have a ...
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Split polygons in a shapefile based on distance [closed]

I have polygons as shapefile sprawl on very large area in Brazil, with many "blank" area in the middle: I would like to split this shapefile to smaller groups of polygons based on their ...
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Raster pixel size changed after classification QGIS

I've been trying to classify an imagery with k-means clustering for grids tool in QGIS 2.18.22. The imagery is acquired from Sentinel 2-B which should have 10m sized pixel. Before classification, i ...
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Invalid classificationField when updating symbology via ArcPy

I'm new to defining symbologies via ArcPy. I have some code (snippet below) that identifies broken links in .aprx files, sets a new data source & refreshes the symbology data range of this new ...
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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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Classification not corresponding when saving a raster from WMS layer in QGIS

In QGIS, I would like to save a WMS layer representing the pHx10(ranging from 0 to 140 https://maps.isric.org/mapserv?map=/map/phh2o.map from ISRIC) using an area in Belgium as a map extent. I saved ...
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Reclassify points within a bounding box with PDAL

I have a list of 3D bounding boxes manually drawn around noise points and I want to reclassify them as noise. One option would be to simply drop them but, in this particular case, I would want to have ...
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2 votes
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Random forest for Landsat 8 in Google Earth Engine JavaScript API

I want to apply and examine random forest classification results on landsat 8 image collection in Google Earth Engine (as modified from the origin code in Earth Engine Tutorials) Accordingly I ...
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Setting the colour of one class to display with "No Colour" Google Earth Engine

I would like to display one class within a binary image as "transparent" or "no colour". I have tried the following: var NDVIclass2Clipped = NDVIclass2.clip(geometry) Map.addLayer(...
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Image classification check points

I am running an object based image classification and am wondering how I should create my accuracy check points. Do they need to be random or can I select the areas manually? The majority of my study ...
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7 votes
2 answers
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Classifying raster layer by number of equal values in given area using QGIS

I am using QGIS 3.16.12 - Hannover. I have a binary raster layer which consists of 2 values, either 0 or 1 (in my screenshots, 0 = black, 1 = white). The 1 values are scattered throughout the layer in ...
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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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Changing upper break value to decimal using ArcPy with ArcGIS Pro

My ArcGIS Pro custom script tool is based off of a script that changes break values from a user's input. I believe I've done all I can troubleshooting the existing script. I'm suspicious of the tool ...
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Supervised classification in parts

I have an image from 1990 (res 30m, also clouds) for an area equal 2100km2 and when I performed the supervised classification, the software (ERDAS) confuses the classes that look similar. Is it ...
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Identify Pavement Markings from Satellite Imagery and export to shapefile

I have a 10cm x 10cm aerial photo of a city which I plan to use for classification of pavement markings (e.g lane arrows, lane lines, bike stencils etc.). Currently, the process I'm envisioning to ...
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Combining training datasets extracted from different images in Google Earth Engine

in Google Earth Engine I would like to combine training datasets extracted from many different images (same area but different years). I would then perform a random forest classification. How can I ...
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How to Interpret eCognition Best Classification Result [closed]

I am learning eCognition using the trial version. Having completed an object-based classification, I wanted to view the accuracy. I can't though find any straight-forward guidance on how to interpret ...
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Why is the preview in SCP working, but the actual classification not?

I am using the Semi-automatic Classification Plugin (SCP) to classify Sentinel and Landsat satellite imagery. I have training ROIs saved in a file (.scp) and (re)calculated their spectral signatures. ...
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Train SVM at higher spatial resolution than the data that is to be classified?

I want to use support vector machines to classify landcover of a raster image and compare the results for different spatial resolutions. I will simulate the coarser spatial grain by aggregating ...
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Changing simple fill symbol to line fill symbol using ArcPy with ArcMap

I have the following scale with different intervals in ArcMap: I want to change it to: The issue here is that I have to do this for many frames. Can I achieve it in arcpy? import arcpy lyrfile1 = &...
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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,...
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Automating ArcMap quantile plotting with ArcPy

I have a shapefile to which a CSV file with multiple columns has been joined. This CSV file has numeric values ranging from 0 to 1800. After joining, I have to plot each column as each plot (or data ...
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