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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112 views

Clustering spatial data based on categorical attribute

For a project I'm doing, I want to cluster parcels together based on their specific land use category. As an example, a small part of the data looks like this. Spatial Data with different categories ...
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1answer
51 views

Is there a function in PyQGIS (QGIS 3.10) similar to the ''slice" function in ArcPy?

I am working on a script that automatically generates heatmaps from point data. I am aware of the heatmap/KDE tool already existing in PyQGIS (I am working in QGIS 3.10). What I want to do after ...
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LiDAR data should be classified according to the source/vendor (ELVIS Australian source) but it is not when put into ArcGIS Pro

ELVIS states the following for areas with point clouds available: The C0 LAS data set contains point data in LAS 1.2 format sourced from a Leica-Geosystems Airborne Digital Sensor(ADS). The processed ...
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1answer
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Add default classification to Esri ASCII Raster?

I have some .ASC data files from Wales Govt. LiDAR data. I converted it to LAZ using LasTools, but when I try to use the data in a third party app, I get an error saying that the data is unclassified....
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1answer
47 views

Getting forest area (km2) of a region after the classification by RF considering the >10% tree cover and 0.5Ha?

I am trying to make a yearly image collection using Landsat images, then trying to make a classification using Random forest for the image of the years 1990, 1995, 2000, 2005, 2010, 2015 and 2020. I ...
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Alternative way of correctly classifying Landsat images

I am conducting a supervised classification of Landsat 8 image. I have 6 classes: river, forest, built-up, brush land, grassland, and agricultural land. I assessed the spectral separability of each ...
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1answer
58 views

Map by density of information per pixel?

I am working with QGIS. I have 6 shp files of the same pixel resolution (1 pixel = 10*10km). My issue is that I would like to represent them all on one map as such manner that the color varies ...
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1answer
15 views

Image classification history in ArcGIS Pro

I would like to examine the details for a supervised classification project performed previously in ArcGIS Pro. Specifically, I am interested in the segmentation characteristics used (spectral and ...
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1answer
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Error while exporting from Google Earth Engine

I run an unsupervised classification with Google Earth Engine using this code: // UNSUPERVISED classification of Conifers// var input = ee.ImageCollection("COPERNICUS/S2_SR"); var ...
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0answers
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Spectral signature of classified classes in Google Earth Engine

I wrote this code in Google Earth Engine to perform unsupervised classification. The code seems to work fine. I need to classify conifer trees specifically between all other land covers and I need ...
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Scale and Numpixel in Unsupervised classification in Google Earth Engine

I used the sample code available in GEE website for unsupervised classification of Landsat data and I changed it to use Sentinel 2 L2A data. var S2 = ee.ImageCollection("COPERNICUS/S2_SR"); ...
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Cannot see or classify weighed overlay or weighted sum rasters using ArcMap

I ran weighed overlay and weighed sum on a suitability analysis in a model. neighther one is visible when added to display. The weighed sum values are also suspect (first pic). I go to properties, ...
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Removing cast shadow from Landsat 8

I've got Collection 2, level 2 Landsat 8 dataset which contain mountains. The problem is the cast shadows from the mountains, so that I can't classify these pixels well. These pixels have much lower ...
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1answer
19 views

nDSM tree detection using scipy watershed

I am trying to generate segments with single trees in a normalized surface model (nDSM). I tried using scipy.ndimage to achieve this, but the segmentation results are not precise. I would like a ...
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Automatically labeling layers according to raster characteristics

The question is oriented more towards end user and came up during the preparation of field maps, which have to show previously mapped biotopes and their ID on an aerial image. The map is used to ...
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Finding only one class (stones) in aerial image using SAGA GIS

I have a color infrared image of a mountain with trees, meadows, clusters of stones and single stones. For my work I need to identify only the pixels that cover stones, everything else is secondary. I ...
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SCP - Keyerror when merging ROIs into one class

I want to merge the spectral signatures from the classes in the ROI list into one class. E.g. I have 4 ROIs representing water and I want to merge these 4 water ROIs into only one water class to ...
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1answer
30 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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1answer
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Classification of drone imagery (RGB) with SCP [answered]

How can I work on the classification in orthophotos (generated by Metashape from a DJI Phantom drone) when I cannot input the orthopoto into the band set? SCP does not find the raster of the ...
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1answer
32 views

Seeking Random Forest R Code for Temporal Datasets [closed]

I have images from 4 different years and field datasets that correspond for each year. Is there an R Code for Random Forest that will give me a classification map based on the 4 images and their ...
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26 views

Adding categories classification to rule

How do I add sub categories to a rule with automatic classification as I modify a field? Basically I want to give the chance to display each single new feature.
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1answer
56 views

lidR Vegetation Classification

I'm new to R and to lidR. I have LAS files that are already ground classified and I'm attempting to use the method below to classify the vegetation and then write a new LAS file retaining the ground ...
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Merging Image Collections and Land Classification using Google Earth Engine

I ultimately would like to look at multiple parameters on a landscape to identify suitable habitat for a squirrel species. The parameters I would like to look at are 1) NDVI 2) Elevation 3) Impervious ...
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Using training polygons to classify past imagery based on spectral reflectance in ArcMap

I am currently creating training polygons on ArcMap on 2020 imagery and classifying that imagery. I want ultimately to compare it to historic imagery (I'll first do 2013 for example). However, I ...
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Creating polygons based on overlapping buffers and classifiers using ArcMap

I have a shapefile with around 100 points, each representing 4 different types of habitat. My goal is to create polygons around areas of the same type of habitat. I've created 100 m circular buffers ...
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1answer
70 views

Classifying an image based on the EVI values of vegetation

I am very new at GEE, and I’m trying to classify an image based on the EVI range of various vegetation classes. For example, Bamboo may have a minimum threshold of 0.6712 and maximum of 0.776 EVI. ...
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1answer
54 views

Apply Jenks classification on a subset of features - PyQGIS3

I have a layer of watersheds, and a layer of diagnostic units, that are contained in each watersheds. I have indicator values for each diagnostic unit. Indicator values have been normalised according ...
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0answers
45 views

ArcGIS - separate/split shapefiles by attribute range and save

Problem: I often have a shapefile that I classify into 3-5 classes based on the values of a specific field. Usually I am interested how many features are in each class and which area has each of the ...
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22 views

There is Change in classification total area after Exporting and reclassifying it from **Google Earth Engine** to ArcMap

I have done classification of 6 classes in google earth engine on an available forest mask that has an area of about 2493 sq. km. The forest mask basically uploaded to Google Earth Engine and ...
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1answer
59 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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1answer
113 views

Validate a supervised classification in Google Earth Engine using ground truth data

I ran a supervised classification in Google Earth Engine (GEE) using the following script. // add an image, bounds, filter data and sort by cloud cover var limitiNapoli = 'PathToMyasset' var image =...
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0answers
29 views

GEE: Creating a buffer stratum to improve accuracy

I want to create a buffer (post-)stratum in addition to my other four strata (forest, nonForest, degradation, deforestation), in order to increase the accuracy of the auto-classification. My wish is ...
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50 views

Using attribute domain and subtypes in ArcMap

I have a schema (attached) for a certain classification that I need to include in the data structure. Is it possible to use subtypes and domains to get the proper solution? Simply, How to represent ...
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2answers
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“User memory limit exceeded” using Random Forest classification

I am trying to classify using randomForest classification in GEE . However, I always get the error User memory limit exceeded, so I assume the number of the feature are too large. Nevertheless, I saw ...
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0answers
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Getting different “Layer Errors” every time for the same classification code in GEE

I am running a classification code and getting different errors every time. classification: Layer error: The service is currently unavailable. classification: Layer error: Computation timed out. ...
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0answers
99 views

Getting different “Layer Errors” every time for the same code in GEE

I am running a classification code and getting different errors every time. classification: Layer error: The service is currently unavailable. classification: Layer error: Computation timed out. ...
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0answers
28 views

Retraining a classifier with training data from different images

I am in the process of conducting a multitemporal image classification in Earth Engine using training data from specific images within an ImageCollection. So far, I was able to classify an image from ...
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1answer
58 views

lidR - add vegetation classification to unique trees

I have done a individual tree segmentation using lidR and the resulting LAS file now has been classified so that all points belonging to a tree have a unique treeID. So far so good! But before writing ...
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1answer
47 views

Problem dry fields- urban areas on supervised classification in QGIS, Landsat 7

I am trying to make a supervised classification on a Landsat 7 image using the QGIS 3.16.1 version. I am using the SCP plugin to do then classification. I am doing the classification using the RGB ...
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0answers
46 views

Accuracy assessment (confusion matrix) of image classification from Landsat imagery in SAGA GIS

I have classified Landsat images in two different classes, namely pervious and impervious, in SAGA GIS, using training sample in polygon shapes. This training sample has only one column of attribute ...
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0answers
45 views

Interpreting GEE unmixing SMA classification output results

I would like help interpreting unmixing SMA (Spectral Mixture Analysis) output results in GEE. I have identified endmembers by class as the following: 4 classes: 0 = forest; 1 = savanna; 2 = ...
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1answer
25 views

Laspy outfile gives zero decimal points in coordinates

Im detecting trees and want to create a .las file to be able to display it in Cloud Compare. I can not wrap my head around why this is not working. The scale should allow for 6 decimal points but it ...
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1answer
56 views

Removing a polygon-defined area from a multiband raster: A landscape classification inquiry

I am trying to exclude multiple lakes and reservoirs from a Supervised landscape classification but at the moment I have not found a way to do this. So far I have used the following workflows: 1.Draw ...
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2answers
239 views

Can you store a Classifier in Google Earth Engine for later use?

Training a classifier in Google Earth Engine is slow and can sometimes show temporary errors like "Capacity exceeded". To combat this, I would like to train the classifier, store it, and ...
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0answers
26 views

Running Train Random Trees Classifier which classifies by probability and not discrete classes using ArcMap

I have a a series of points which values' are a binary of a feature being present or not-present and a multiband raster of various landscape varables. Is there a way to use random trees classification ...
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2answers
210 views

QGIS How are data points of the same value classified for Equal Count (Quantile)?

For example, I have 100 data points and am classifying them using the Equal Count (Quantile) method. I want to have 5 classes, and in the ideal situation I will have 100/5 = 20 values in each class. ...
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0answers
28 views

Maximum likelihood image classification in ArcMap

I am running MLC in ArcMap but the result is returning 1 class instead of all 3 classes that the training samples have. What could be the cause of that? is my sample too little or what could cause it?
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1answer
51 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 ...
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0answers
50 views

GEE fails to classify different classes in Supervised Classification

I am doing supervised classification for flood mapping. The problem is when I try to classify into different groups, the code can't seem to differentiate between vegetation and Water (personally, I ...
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0answers
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Setting LAS Class Codes in ArcGIS Pro too slow

I have seen similar questions, but they don't quite relate to my particular issue. I classified habitat in a high-resolution drone orthomosaic image of a 300-m long stretch of beach, then used Raster ...

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