Questions tagged [image-classification]

Image classification refers to the task of extracting information classes from a multiband raster image.

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Extract water areas from aerial photogrammetry DEM in QGIS

We are working with peatland restoration sites providing aerial photogrammetry of the restoration progress. We want to differentiate between areas water and bare peat which can look very similar in ...
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18 views

Is there a faster way to assess accuracy of image classification in ArcGIS?

I am trying to perform accuracy assessment on a raster RGB image after supervised classification. I know the normal workflow in ArcGIS would be to create accuracy assessment points, then evaluate each ...
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13 views

Cannot Load Training Samples to Edit?

I'm trying to do a maximum likelihood classification with supervised training samples. I saved the training samples as a .gsg and I was able to load it into a maximum likelihood classification and ...
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20 views

Does contrast stretching help image segmentation and classification?

I am trying to identify and classify marine litter from drone RGB images at beaches. Due to the small size of litter and only having RGB images available, my supervisor recommended to carry out ...
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16 views

NoData cells appeared in segemented raster

I am trying to classify an aerial image of a dike into grass and weeds. I used an aerial RGB image of 10 cm resolution being a TIF file. This aerial image is cleaned and contains no gaps. Only outside ...
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32 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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27 views

ROI signature creation error

I'm trying to run a maximum likelihood classification on a Landsat 8 mosaic to assess land cover, but I keep getting the same error during signature generation: I never got this error before, and ...
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63 views

Unsupervised classification in ERDAS imagine

I am trying to make a classification to run some index ( like NDVI) to see the change over time using the image difference function. Is it possible to do an unsupervised classification on one image ...
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97 views

Supervised classification with only one class with Google Earth Engine

I am a beginner with geospatial analysis and Google Earth Engine. I am trying to classify only one class of Landsat 5 image (swimming pool). I got several training sites and applied the classifier. As ...
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149 views

Using output of unsupervised cluster analysis to train supervised classification for vegetation mapping?

I'm using Google Earth Engine to classify mangrove forests from Landsat imagery to calculate extent. Let's say I perform an unsupervised K-means cluster analysis on a Landsat scene to identify general ...
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60 views

Color different of two Sentinel 2A (L1C) images from the same sensing date

i'm new to this GIS Q&A websites and remote sensing as well, so sorry for this too basic question. It's about my Sentinel 2 (Level-1C) images. I downloaded 2 images with the same sensing date (09-...
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137 views

QGIS Semi Automatic Classification SCP Plugin Runtime Error

I am using Landsat 8 satellite imagery for doing Supervised Classification using Semi Automatic Classification Plugin (SCP) in QGIS. I have created ROI's and done all the procedures for doing the ...
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123 views

i.cluster command with GRASS GIS

I am trying to do an unsupervised classification using GRASS GIS software. I have hyperspectral photo and now analyzing vegetation indices. Here is what I did: Created 2000+ raster photos with ...
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86 views

Jpeg Image Classification

I want to perform Image Classification(JPEG Image). I loaded the image in QGIS. Everytime i perform an action, i get a screen pop-up of Co-ordinate Reference System(CRS). How should that be handled? ...
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10 views

Obtaining same classification results using VH and VV polarization for Sentinel-1 data

I am performing an image classification(Random Forest) for obtaining rice and non rice areas from Sentinel-1 data. As a result am obtaining same classification accuracies for both polarizations. I ...
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23 views

How to see classifications of ArcGIS Pro Iso Cluster Unsupervised Classification output raster?

I input a number of raster bands into the Iso Cluster Unsupervised Classification tool and asked for 5 classifications and specified a signature file to be created. The tool ran for a while and then ...
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15 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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27 views

How to use knowledge engineer in Erdas Imagine for rule based classification

I want to use rule based classification in knowledge engineer section of erdas imagine software. But I don't know how to create a *.ckb file. Can somebody point me to some reference material or ...
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75 views

ArcGIS: Train Support Vector Machine Classifier on a Segmented Raster

I have a raster (.jpg) which I have segmented utilising Segment Mean Shift to smooth out JPEG artefact (aim is to classify it as accurately as possible for conversion into vectors). START .JPG Input ...
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12 views

Calculate distance between multiple arrays and landsat bands in IDL

I have a set of landsat 7 layers, that look like this: files = [ $ "D:\ArcGIS\Programmieren in IDL\Landsat Daten\landsat_b1.tif" $ ,"D:\ArcGIS\Programmieren in IDL\Landsat Daten\landsat_b2.tif" $ ...
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1answer
51 views

Area of classified pixels in an image collection

I am using Monthly History data of the Global Surface Water dataset (Asset id: JRC/GSW1_0/MonthlyHistory). I have filtered the images using .filterdate and .filterbounds for my region of interest (...
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40 views

Use raster calculator on an Image Service in ArcMap or ArcGIS Pro

I'm mapping the approximate polygon shapes of dirt roads in a large area. I can see the roads clearly on the world imagery basemap and on the USA NAIP image service. Can I use Raster Calculator to ...
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1answer
55 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, ...