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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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Semi-Automatic Classification Plugin - Crush dumped

I installed Semi-Automatic Classification Plugin but it doesn't work. After starting QGIS, program displays a message "Please restart QGIS to executing the Semi-Automatic Classification Plugin. ...
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1answer
1k views

Is it possible to set different scale dependent visibility for one layer classifications?

I'm working on a sewer and water network, so I need to set different scale visibility for primary, secondary and tertiary network.
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1answer
68 views

How to Classify With Multiple Ancillary Datasets using QGIS?

I've tried using the classifiers in ArcMap which only supports one ancillary dataset and I tried using Orfeo in QGIS 2.18, though the Orfeo Image Classification tool does not accept any ancillary ...
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1answer
43 views

Error while object-based classification

I have code doing the object-based classification. https://code.earthengine.google.com/7ab0276a205e9157c2681b8341db6ab4 However, I encounter this error Error generating chart: Image.reduceRegion: ...
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2answers
27 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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1answer
48 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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0answers
24 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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1answer
38 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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1answer
44 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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1answer
59 views

ENVI 5.1 - ANN Classification - Background was classified into one of the class

I'm new to Remote Sensing and I'm having trouble in ENVI 5.1 where the background was classified as one of the classes in the ROI I used, which is not right. How can I exclude the background or at ...
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1answer
23 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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20 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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20 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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16 views

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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1answer
86 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
53 views

SAR spectral signatures for oil spill detection from different sensors

I have a rather general question about supervised classification for oil spill detection. I want to apply supervised classification on the ESA SNAP dark spot detection tool results. My question is: if ...
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0answers
12 views

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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0answers
20 views

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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0answers
19 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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2answers
131 views

Is the Random Trees Classifier in ArcMap 10.5 equal to Random Forest?

Is the Random Trees Classifier in ArcMap 10.5 the same as what is named Random Forest in other applications/software? I see that the parameters are the same and the design seems the same, but I need a ...
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1answer
45 views

Data type doesn't match error in Sieve filter

I classified some land cover types in aerial image with Erdas Imagine, now I want to remove classification errors showing very small areas. I tried to use Sieve filter, but getting error notification "...
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1answer
39 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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23 views

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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1answer
34 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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26 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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1answer
53 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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0answers
9 views

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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31 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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1answer
31 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
32 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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2answers
146 views

Classification model using NDVI time series?

I am trying to form a classification model with the help of NDVI time series data. I want to use methods like SVM and Random Forest. I know how to apply these methods to normal data. But, I am ...
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0answers
26 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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0answers
94 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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1answer
75 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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0answers
8 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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0answers
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 ...
5
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2answers
735 views

Changing line width by classification in QGIS

I am using QGIS 2.18.18 I have a map of rivers and I want to style them based on their width. I have width as an attribute of the rivers layer. Just as we can style colors by category or graduated ...
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0answers
34 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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1answer
26 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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0answers
27 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 ...
4
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1answer
134 views

Setting GroundFilter parameters for low density point clouds?

I'd like to use the function GroundFilter on my dataset. However, the manual says that the default values of the parameters used by this function (g parameter, w parameter) are related to a high ...
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1answer
55 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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0answers
30 views

Labeled training data for water extraction/classification

I'm working on a small project to extract water features from satellite images. In particular, I plan to use Landsat 7 ETM+ satellite images of a particular lake (it's on plain land). I have decided ...
4
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1answer
58 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
38 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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3answers
708 views

Determining if polygon lies completly in another polygon or only partly using QGIS? [closed]

I primarily use QGIS. I have two Layers which both contain polygons.So one layer(A) contains only one polygon, the other contains a number of polygons(layer (B)). I can run the Intersect-Tool and ...
4
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0answers
320 views

Running OTB Random Forest Classification

I am having trouble processing a satellite image using the RF (Random Forest) classification, that is a machine learning algorithm in the Orfeo Toolbox of QGis 2.18.1. When I run the Tool, the ...
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1answer
58 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
65 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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2answers
38 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 ...