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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18 views

Selecting certain segments when creating training set for classification in ArcGIS?

I am trying to classify an RGB image in ArcGIS 10.7. When I try to use the 'select segment' option to create a training set I am allowed to pick only certain segments to add to my training set. For ...
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9 views

K-fold validation on Google Earth Engine

I have a satellite image "india_image" and data in form of a feature-collection "ft". I want to perform k-fold validation on this data in Earth Engine. How to do so? var india_image = ee....
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Getting areas of different classes in Google Earth Engine?

I would like to know if it is possible to calculate the area resulting from a classification. he been reviewing some sections, I found this Calculating areas of different classes in Google Earth ...
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26 views

Performing time series supervised classification on Google Earth Engine?

I am quite new as I only use google earth engine for a couple weeks. So if I missed anything feel free to advise The goal want to achieved is to perform time series classification on Google Earth ...
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24 views

Problem showing classes on Supervised Classification using ArcMap

I'm using ArcMap 10.5. With the "Image Classification" tool I create all the polygons with the training areas for each class. I use "merge" and give the name of the classes (ocean, river, urban...) ...
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26 views

Creating classification matrix for rasters with abrupt class intervals in R

I am trying to re-classify to raster images which do no have continuous range intervals which normally have been used in examples for creating classification matrix. My original data has these values ...
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20 views

Calculating classed areas of classified image in Google Earth Engine

I am attempting to calculate of area of 4 different classes in my classified map. But I am getting error "Dictionary (Error) Classification request exceeds size limit." Here is my Code: //Load ROI ...
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29 views

Google Earth Engine: convert image collection to image

I want make Supervised Classification for all images in imagecollection. I make one image with all bands, but i can't make classification, console give error: merged.sampleRegions is not a ...
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ArcMap cloud removal process

I am working with Landsat 8 data. I have performed the necessary pre-processes that I want (atmospheric and topographic correction and pan-sharpening, using QGIS and ERDAS). I am now working on ...
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48 views

Running classification on image collection using Google Earth Engine?

I have ImageCollection. composed of satellite images which shows Zebras on grasslands. The location of each zebra is stored within a point shapefile, which I uploaded as a "table" into Earth Engine. ...
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26 views

Classifying coordinates on land/on water using QGIS very slow processing issue

I'm very new to QGIS. I have a problem related to the "select by location" tool of QGIS. I have loaded 10 different layers into my map containing data of waters (rivers, canals etc.). Now, I want to ...
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51 views

Classifying coordinates on land/on water using QGIS?

I am a new user of QGIS. I'm looking for a solution for my problem. I have my own dataset providing the latitude and longitude of different unique ID's. Now, I would like to classify those ID's that ...
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59 views

Adding up several rasters to show the change

I want to add several images such that their change is shown in different colors. Such as the following in which I simply added two images in their grayscale. But I would like to have a colored ...
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1answer
58 views

GLCM measure in an object-based classification?

I am trying to classify agricultural fields with randomForest model. I will conduct an object-based classification. To do so, in the code by Ned Horning, I provide the boundaries in a shapefile. The ...
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29 views

Feature space selection for river sand classification using multispectral imagery

I want to perform supervised classification for river sand detection. I have 3 m spatial resolution Surface Reflectance multispectral imagery with B, G, R and NIR bands (Planet data). Which all ...
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30 views

Split list by chunks Earth Engine with mean

I am calculating mean temperature data based on historical data. I need to calculate the mean through the years (jan-jan-jan-jan...) and the means within a year (jan-feb-mar-may-jun...). This is ...
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22 views

Selecting Certain Slope Class That Is Not Surrounded Narrowly By Other Class

not sure how to brake it down, but let me try i've created a slope classification with this class now what i'm looking for is how can i select the class of 0%-8% that is not surrounded narrowly by ...
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29 views

Extracting Results of KMeans using Google Earth Engine?

How can I extract the Values for the Cluster-Means in Google Earth Engine? // Define each water-body as a own region var region = water // training region is the full image var training = ms1_new....
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Checking completion situation in GEE Code Editor?

I am trying to export a classified image and an accuracy table from GEE Code Editor to my PC. I think I know the procedure and implemented many times before. Can I see the downloading percentage of ...
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Input of KMeans when using multiple Band-Image in Google Earth Engine?

I am using Earth Engines ee.Clusterer.wekaKMean() for Clustering my Data. My input is a mosaic of different S1 images containing VV and VH bands. Is it possible to declare which bands are taken ...
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How to create coordinate system (using Lat/Long) across IR & VIS satellite images

A recent project of mine has been to gather IR and VIS data from WeatherUnderground's online site for the purposes of creating fun and informational temporal GIFs. Now, I'd like to take it a step ...
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25 views

How can you identify loam/clay settlements with Sentinel-2 Images when using eCognition?

I am doing my thesis research about analyzing settlements in Mali with Sentinel2 images with the use of the program eCognition (object-based). We have trouble with determining the settlements because ...
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1answer
73 views

Classify polygons with Random Forest on Python

I have a segmentation shapefile made with e-cognition containing many polygons of which a part classified for the train file. I would like to classify them by applying labels (e.g. water, vegetation, ...
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Conditional Expanding in ArcGIS Desktop?

I would like to reclassify a LC map given some conditional rules (raster with 8 classes total). Using the illustration, I would like to expand the green pixels (two distinct classes) on the white ...
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33 views

Supervised Classification within the bounds of a FeatureCollection

I am a bit new to classification within GEE and was hoping to get some help regarding classifying within a specific region. var bands = ['NDVI']; var landSat = ee.Image(ee.ImageCollection('LANDSAT/...
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Assigning colors to specific table once, which will be used in different classifications of Google Earth Engine?

I am working on Crop Classification Assignment, in which I do classification twice in a year on the basis of major crops time periods. What I want to do is to assign Color to Unique ID of crops once ...
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32 views

What is Kappa coefficient in HSI classification? [closed]

What is the Kappa coefficient and how it is calculated in the HSI classification process?
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38 views

Converting raster symbology to vector shapefiles using ArcGIS Desktop?

I am using ArcGIS Desktop. I have a satellite raster geoTIFF, the image shows a coastal region with water, rocks, grass. To display these three features of interest, I've symbolised the raster via ...
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1answer
57 views

lidR (rlas) writeLAS changes values from Classification attribute?

I have a point cloud with extra attributes: class : LAS (LASFˇ v1.4) point format : 6 memory : 2 Gb extent :7498400, 7499200, 5779500, 5780000 (xmin, xmax, ymin, ymax) coord. ref. ...
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1answer
36 views

Google Earth Engine: Supervised Classification fusion table error

I am currently doing a supervised classification (just two classes for detection of large-scale solar plants) in GEE. When I am using training polygons drew and create as polygons everything works ...
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27 views

GPS file categorizer

Do you know a software tool that can categorize/group GPS track files based on the location of its points? I need a tool (standalone executable, script or QGIS extension) which I can feed a list of ...
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244 views

Doing change detection of land cover between 2 landsat images in google earth engine?

I am doing land use/ land cover classification of 2000 and 2018 year . I had completed supervised classification now i wanted to do change detection analysis. Please guide me how to do change ...
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13 views

Is there a way to reuse the samples chosen for NN classification for an another image?

I recently carried out the classification of a UAV multi-band orthoimage using NN method in eCognition. I have another orthoimage from the same mission for a neighbouring area. I would like to apply ...
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1answer
38 views

Count pixels per class instance of a raster classification

I have a fairly easy problem but I can not find any algorithm for it. I have this kmeans classification of a windspeed pattern from a model output: What I want now is to count the pixels in each ...
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44 views

Classifying Attribute Table values? [duplicate]

I have an attribute table with a lot of lines. I want to classify them considering their length: SHORT (from 0 to 50) MEDIUM (from 50 to 150) LONG (from 150 to 180) How can I do avoiding to modify ...
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35 views

Can I symbolize based on the syntax in a description attribute colum?

I got a kmz-file from an organization and the attribute table has a colum 'description' with a synthax that holds import information (such as date built, water source, village etc.) instead of a ...
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47 views

Linear Regression on single image with multiple bands in Google Earth Engine

I have a single image with 3 bands representing different properties for water detection and a 4th band for reference (ground truth - water/no-water). I want to perform a linear regression using the 3 ...
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1answer
66 views

Can my “.las” data be classified [duplicate]

I was given a ".las" data set from a Trimble/AutoCAD shop. I use Esri. I could not import the .las file they supplied to an ESRI LASDataset as it was created with Trimble software. I downloaded and ...
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1answer
104 views

A reproducible example for the use of separability measures in improving selection of spectral variables

I have been working with the tutorials in GEE on supervised and unsupervised classification, but I haven't come across any examples on the use of separability measures such as Jeffreys-Matusita, ...
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1answer
93 views

How to automatically get/assign contour height attributes?

I have quite a simple problem yet I can already guess the solution is going to be pretty complicated. I'm using QGIS and was wondering if there is a simple way for the computer to automatically assign ...
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1answer
78 views

Get round numbers using Natural Breaks (Jenks) classification

In ArcMap, is there an easier way to get more round numbers when using the Natural Breaks (Jenks) classification in the symbology tab? For example, in the image ebelow I'd want the classes to be 5-140,...
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2answers
44 views

How can I find the percentage of representation of classes?

I have done a classification using the semi-automatic classification plugin, and now, I would like to express each class in percentage of the study area (e.g. forest represent 20% of the study area ...
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1answer
27 views

Merging NDVI classified and unsupervised classified image?

I have clipped forest area from an image and apply NDVI classification on forest area and in the remaining, I have done unsupervised classification. So, I want to know after NDVI and unsupervised ...
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1answer
91 views

Earth engine error: Layer 1: Layer error: Image.visualize: Parameter 'image' is required

For land use classification of my shapefile, When I use Landsat 4 collection, got an error: Layer 1: Layer error: Image.visualize: Parameter 'image' is required. but in the case of Landsat 8, ...
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1answer
90 views

Can I use a greenest pixel or a no clouds Sentinel 2 for NDVI analysis?

Can I use a greenest pixel or a no clouds Sentinel 2 for NDVI analysis? I want to use it for extract spectral signature. And now that I´m asking about it, I want to know if I can work classification ...
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36 views

Merging and Clustering Rasters using QGIS?

I have 3 rasters for three regionalized variables (r1, r2, r3). The rasters have the same projection, origin and cell spacing. Can I merge this into ONE "multivariate" raster? (ie x,y,r1,r2,r3) I ...
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40 views

Calculation area of different colored region using image classification

I have a georeferenced JPEG image(as shown below) I want to calculate the area of regions covered by red color and regions covered by blue color. I tried maximum likelihood classification using ...
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1answer
143 views

QGIS Gratuated Symbology gives differents results on every classification with Natural Breaks (Jenks)

When styling a polygon layer using the Graduated styling and the Natural Breaks (Jenks) mode, QGIS is classifying the data with different values. So every time I click on "Classify" the values are ...
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1answer
44 views

Classifying fields and getting statistics in ArcMap? [duplicate]

I am using ArcMap 10.6. I have a table with country data. I am interested in Asia only, so I created a new layer (and shapefile). Several countries have missing data, which was filled with the same ...
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2answers
102 views

Feature normalization (scaling) for Hyperspectral images

I have been straggling with the concept of feature normalization for the hyperspectral images. Respect to my problem I have attached a picture of my problem which clearly stands the issue which I have....