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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922 views

What is the convergence threshold for ArcGIS Iso Cluster?

The ArcGIS tool Iso Cluster Unsupervised Classification does not seem to have any documentation on the convergence threshold used in the tool. To compare, Erdas Imagine has all of the necessary ...
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925 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
81 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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2k views

Classify image using segmentation analysis using QGIS and OrfeoToolbox

I am working on a project where we have made a RGB orthomosaic using a drone which I want to classify using QGIS. I am not a fan of unsupervised classification, and I started exploring the ...
3
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1answer
351 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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106 views

Reproducing Paper Results for Land Cover Mapping of Satellite Imagery?

I am interested in training a neural network to perform pixel-based classification for land cover mapping of satellite data. In order to learn more about this interesting field I am trying to ...
3
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198 views

QGIS: Cropland Data Layer - how to add class names to .tif file?

I'm working with a clip of the Cropland Data Layer (raster), which has a number for each value coded to a crop type. I want to add these crop type / class names to the .tif file (and have them show up ...
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562 views

QGIS - Semi-Automatic Classification Plugin v.4.9.5 - When trying to create ROI getting Error[43]: Attribute table error

when I try to create a ROI within the Plugin: Semi-Automatic Classification Plugin, I am getting the Error: Attribute table error. Which means it is not creating MC ID / MC Info or C ID / C Info in ...
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84 views

How to use a conditional logic on Impervious Mapping

I am trying to use a logic ( rule -based classification ) to extract built-up area, similar to as suggested by Xu (2007).He uses, three spectral indices, SAVI( Soil Adjusted Vegetation Index), NDBI ( ...
3
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423 views

What does “Information [18]: Select at least one signature” in the semi automatic classification plugin mean?

I am using the semi automatic classification plug in to classify vegetation and water in a satellite image. I create training shp and signature list. When i hit "classification preview" it gives me ...
3
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318 views

ASTER mineral indices with VINR and SWIR data

I need to run a supervised classification on ASTER data in order to map a rock formation, which is composed of chert. There is no shortage of indices which can be used to highlight silica rich ...
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389 views

R: Can raster predict function pass to predict.rfsrc (a prediction function in a parallel verion of RandomForest)?

It seems that raster predict function can pass to predict.randomForest by setting the "type='response'". I am using a parallel version of randomForest package called the "randomForestSRC" and I am ...
2
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1answer
57 views

How to replicate ArcGIS geometric intervals in QGIS

Is it possible to replicate ArcGIS's Geometric Intervals in QGIS 3 layers symbology? I am using QGIS 3.10.9 LTS and would like to assign a geometric interval style to a simple shapefile of UK counties ...
2
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1answer
172 views

Results of Variable Importance of RF Classifier in GEE

I create a RF modulu in GEE like this; //Random Forest Result Function Module exports.getRfResults = function(image, title, bands, trainPoint, testPoint, area, label) { //Create Sample Points ...
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0answers
57 views

Calculating proportion of pixel containing vegetation (from sentinel 2 image stack)

My task is to perform a supervised classification of landcover across a huge (20,000+ hectare) property. I need to classify into three classes: forest, regenerating trees, and soil. We use s Sentinel-...
2
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0answers
32 views

Create categorized renderer from styles won't color categories

I'm trying to use the tool named 'Create categorized renderer from styles' When I classify my layer by an attribute table value in layer properties/symbology/categorized I get different colors ...
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51 views

More precise control over QGIS symbology classification

In QGIS, I would like to classify my graduated symbology by standard déviations, as such: . However, I find that the behaviour seems erratic or hard to control, and I can't choose the number of ...
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25 views

Calculating range of values for a class for landscape analysis

I am working on a large scale landscape analysis in Qgis: on several raster layers i made (using SRTM dem as source data) i am doing a reclassification procedure. Reclassification is based on a set of ...
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24 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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39 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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687 views

Classifying image using image segmentation in google earth engine

I am trying to classify a Landsat 8 image in google earth engine. I have to classify them object based, since I am building on an earlier research where they have used object based classification. ...
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136 views

Orthophoto land use classification in QGIS

I am using a CIR orthophoto and tried to make a land use classification with the use of Semi-Automatic Classification Plugin in QGIS. I work in QGIS 3.2 but I get errors that my ROI are too small (...
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207 views

Classify / section line or group of points according to shape (with shapely objects)

Is there any python module/function that classifies/sections a shapely line according to the shape the line forms? If not, I could do it with the positions of the points that form the line. I would ...
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158 views

Supervised classification using endmember spectra (using ENVI 5.1)

We are trying to map land cover classes over a small watershed. We have selected training sites (during a field campaign in early 2017) and determined their spectral profiles on a Landsat 8 image ...
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0answers
336 views

Importing classification bitmap made by another software into QGIS?

I am currently trying to import a classification bitmap made by our own deep learning software into QGIS. The classification is saved in a TIF file, the classes are 8-bit integers. We have the class ...
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0answers
169 views

Delineating coastline with panchromatic imagery

I have a panchromatic satellite image with a large coastline area and my goal is to delineate this coastline with a maximum accuracy and minimum amount of manual work. What is the best option to ...
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268 views

reading .tif and .tif.aux.xml as a whole using geotools

I have sample.tif, sample.tif.aux.xml, sample.qml files in a directory. The .qml and .xml files contain classification data about .tif file. For example my .xml file is something like this: <...
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205 views

Erdas 2014 process time signature editor supervised classification

I am currently using erdas imagine 2014 with 64bit OS. Basic configurations of my computer are; i7 3820 3.60 GHz CPU, 16 GB memory (RAM), gforce GTX 680 SLI 256 bit Graphic card ( 2GPU ), 250 GB ssd. ...
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0answers
261 views

Supervised Classification Plugin QGIS: change input image; use another raster layer

I'm doing supervised classification on a sugar cane field for identifying vegetation, soil, and soil and litter. The plugin is only taking in the GeoTiff taken from the multispectral camera we used (...
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0answers
742 views

Classifying data as Natural Breaks using ArcPy?

Is there any chance I can create a simple python script to classify my data as Natural Breaks? I have only created a script for quantile classification, but it is not enough for my work. arrp = ...
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0answers
513 views

Needed help to launch SVM classification in eCognition

I would like if somebody help me to launch SVM classification in eCognition. Have you met any tutorials? I was searching through ecognition community, but there I find only basic KNN supervised ...
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653 views

Remote sensing Classification and texture analysis compared with QGIS zonal statistics

I am Using Geomatica to analyse suburban spectral signature in Las Vegas. Ran a texture analysis on all band images. Combined texture bands with original image bands to run an unsupervised ISODATA ...
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191 views

Landsat Data to Map Slums in India

I am working on a project to answer the following geographic question: How much have slum areas increased in Mumbai, India, since the 1970's (or earliest data). I have downloaded LandSat imagery and ...
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0answers
477 views

How to batch classify a multi-temporal raster image stack?

I am using dense time stacks of remotely sensed imagery to analyse vegetation change in the Arctic from 1984-2010 for one scene. I will be needing to classify each image, likely using the Maximum ...
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198 views

QGIS 2.2.0-Valmiera 64bit on windows 8.1 displays error while creating ROI in SAC plugin

I don't know what happened while creating ROI during Classification using Semi automatic Classification Plugin 3.1.0 "Rome" installed on hp Pavillion i7 with windows 8.1 When i started to generate ROI ...
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0answers
137 views

Flood extent extraction from satellite images

How can I extract the floodwater from satellite images? Is the image classification method accurate for moderate-resolution satellite (Terra/Aqua MODIS)? Or are there more accurate methods?
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894 views

ISODATA unsupervised classification in ArcMap 10.1

I’m doing a project on landsat 5 images. I’ve composited the images into 1 raster, and I want to classify the raster with ISODATA Unsupervised Classification. How do I calculate the best number of ...
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46 views

Using LiDAR to identify coniferous and deciduous trees

Is it possible to use only LiDAR data to distinguish between mostly coniferous and deciduous forest? I have a LiDAR data from spring and summer, but they have different point spacing.
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1answer
22 views

Combine slope info with Landsat for classification in Google Earth Engine

I wanted to add slope data as a band to filtered Landsat data. I used ee.Image.cat to "merge" two images. I can see added band in a merged image, but when I perform the classification (which ...
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0answers
41 views

Overstory-understory classification from discrete return aerial LiDAR

I have an opportunity to collaborate with bat biologists who are interested in predicting probability of roost occurence in seasonally flooded ponderosa woodland. We suspect that both properties of ...
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0answers
25 views

Create an outline based on density of raster

I have a classified aerial image of small vegetation that is separated enough by ground that it is not overlapping each other. After the classification process (dzetsaka), I removed all the other ...
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25 views

Error occurring when converting to dB during the python-based classification

I am trying to perform an object-based classification using a python-based script with rsgislib. Although, when converting to dB, an error is appearing. Any ideas why is this happening? Create and ...
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27 views

QGIS SCP doesn't stack all bands for Sentinel 2

I've been following various tutorials to try and stack and then eventually classify images from Sentinel 2, but after downloading the images and running the band set tool, it simply only stacks 4 ...
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11 views

Unsupervised pixel classification in ArcGIS Pro 2.4.0: ISO cluster will not let me classify image into three classes

I am using ArcGIS Pro 2.4.0, and am attempting to classify a field into a schema with three categories: Leaves, Shadows, and Soil. Here is a sample of the original RGB image: Through supervised ...
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62 views

How to improve LiDAR classification in GlobalMapper

I have a LiDAR point cloud that has a density of 16.4 points per m^2 and spacing of 0.2469m, and am trying to extract trees from it but the classification came with a lot of messy points in classes ...
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0answers
32 views

Handling Nodata values in sklearn (working w pyimpute)

I'm using sklearn for a classification project. Because I'm relatively new to doing geospatial tasks outside of a GUI, I'm using Matt Perry's pyimpute (link has all the code for that module) to handle ...
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0answers
181 views

Multi-temporal classification in Google Earth Engine - clustering and grouping based on time sero

I am working on my master thesis on multi temporal classification of LULC using S2 imagery in Google Earth Engine. The goal: to distinguish urban area from the landscape in the Inner Niger Delta. ...
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0answers
36 views

QGIS SCP pulgin layer output

I use the plugin regularly and have already used every function. But I have often noticed that the output layers are not always intuitively understandable. I googled on the topic and found no ...
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0answers
113 views

Export classified Landsat 7 image - Google Earth Engine

I am trying to export images of MODIS landcover classifications and classified Landsat 7 images. However, my codes only result in black images rather than what I see if I add the layers to the Map. ...
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0answers
163 views

Export classified land cover types as table - Google Earth Engine

My question relates to extracting the area of different land cover types in a region. So far, I classified a Landsat7 image using MODIS data as classifier. When I choose a point on the Map, the ...