Questions tagged [image-classification]
Image classification refers to the task of extracting information classes from a multiband raster image.
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questions
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How to detect green areas in Google Earth imagery using R?
I want to detect urban green areas in Google Earth imagery, using R. I've already downloaded contiguous images and assembled them into a larger image.
The above PNG image has 800x769 pixels, but the ...
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18 views
Exporting result of a supervised classification from Earth Engine to drive
I am doing a supervised classification of an image in Earth Engine. I want to export the results of this classification to my drive
var seed = 2015;
var ft1 = ft.randomColumn('random', seed);
var ...
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1answer
28 views
Earth Engine error: Error: Image.select, argument 'bandSelectors':
I have done a supervised classification. The output is an image collection. I cannot export it in drive. Here is the link
https://code.earthengine.google.com/ebd671bb75dde4892e3a7e14acdc7d4e
var ...
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19 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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1answer
23 views
SVM object based classification QGIS with Orfeo Toolbox. Model outputs incorrect/ invalid
I am trying to run an SVM object based classification on QGIS with Orfeo Toolbox. I have 5x Spectral Tif images of bands; blue,Green, red, Infra-red and Rededge, these were generated from a UAV survey ...
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66 views
Create binary value by comparing classified image and samples in Google Earth Engine? [closed]
Suppose, in Google Earth Engine, I have a classified image with different classes and some test samples as ground control points.
How I can create a Binary feature by comparing classified image and ...
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2answers
41 views
How to define new classes from a change detection raster layer [closed]
As part of my thesis, I'm looking at the atmospheric and landscape effects of the 2018 wildfire in the Algarve. As part of the process, I want to estimate total biomass loss so I have classified two ...
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21 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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27 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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21 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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12 views
Integrating block shapefile into segmentation level in eCognition? [duplicate]
I am trying to perform an object based hierarchical network classification of an urban scene in eCognition. To make the classification better I thought adding the building blocks shapefile in the ...
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45 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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19 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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18 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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40 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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1answer
98 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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35 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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20 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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30 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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0answers
106 views
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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115 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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13 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
102 views
How to obtain percentiles of classes in classified image in Google Earth Engine?
https://code.earthengine.google.com/e430e2a79aecb65e3efbce23779a0abc
I have written this code for supervised classification using the cart classifier.
Now I want to extract the no. of pixels in each ...
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1answer
72 views
Performing Supervised Classification of Houses in Africa using ArcMap?
I am doing a supervised classification in ArcMap to classify land cover types in a study area in Africa. I am using RapidEye satellite imagery (Planet Labs) and they have 5 bands: blue, green, red, ...
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70 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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0answers
119 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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1answer
205 views
Is there machine learning for image classification in ArcGIS 10.3?
I have access to ArcGIS 10.3. Do I need to get ArcGIS Pro to have access to machine learning?
I've read that this is a built-in function in ArcGIS Pro.
links:
http://www.esri.com/esri-news/arcuser/...
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168 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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1answer
113 views
Incorporating NDVI and texture metrics in OBIA-Supervised Image Classification
Anyone knows step-by-step tutorials for incorporating NDVI and texture metrics in land cover classification with ArcMap?
I've been doing supervised classification of Sentinel-2 with the assistance ...
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1answer
57 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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1answer
286 views
Using thematic layer for segmentation in eCognition?
I have a thematic layer, i want to perform segmentation and classification only within the thematic layer,not in a whole image. how can i do it? I tried to segment the image after viewing the thematic ...
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73 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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1answer
49 views
Know of any existing quality training/validation datasets for land cover?
Looking to do some moderate res. global land cover mapping and need as much training and validation data as possible--does anyone know of any good/quality land cover/land use data that are freely ...
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147 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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1answer
41 views
Is it possible to see which Landsat bands were used most, when creating kmeans clusters?
I am using kmeans clustering (ee.Clusterer.wekaKMeans) to classify a Landsat8 image using all 11 bands. I was wondering if it is possible to see what bands are relied on most to create the clusters (i....
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2answers
110 views
Supervised Classification Imagery for rooftops
I'm trying to do a supervised classification in ArcPro that will allow me to find Tar and Gravel rooftops in Miami. I have Landsat data but just wondering if there is imagery out there with better ...
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1answer
459 views
GEE: Supervised Classification exceed memory
I am trying to do a supervised classification using Landsat images, DEM, Slopes, NDVI, etc. Is there any way to do not exceed memory limit?
https://code.earthengine.google.com/...
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1answer
234 views
Orfeo TrainClassifier tool not working in QGIS
I have been using Orfeo Toolbox with QGIS (version 2.18.0) to do image classification.
I was following this tutorial on YouTube on the SVM classifier. I have followed steps 1 and 2 as described, and ...
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1answer
71 views
Supervised Classification using Remote Sensing data?
Is there a correlation between the time that supervised classification takes to execute and the training areas that we choose?
Perhaps if we take larger areas for classification will the ...
1
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1answer
326 views
About support vector machine classification
I want to classify Sentinel 2 images with the SVM in orfeo toolbox in QGIS.
I have made a ROI (2 classes) and use TrainImages classifer (libsvm). I have made a SVM model,but when I use ...
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1answer
588 views
eCognition TTA Mask : Aerial images in ecognition for supervised classification
I am using eCognition Developer Trial 8.0. I have rgb Drone Otho foto. We want to classify this image for various biotope types exist in that region. We have already an existing classification as a ...
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0answers
139 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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2answers
3k views
Performing deep learning land cover classification using R?
I am really new to Deep Learning and, unfortunately, I can't find example codes on land cover classification other than this one where the author wrote a script in R for a large dataset.
The main ...
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1answer
1k views
How do I manually edit raster layers on QGIS 3.0?
Main question: How do I manually edit raster layers on QGIS 3.0?
Some context: I georeferenced Google Earth high resolution downloads on to QGIS, and was looking to do image classification for a ...
4
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1answer
1k views
Exporting classification error matrix Google Earth Engine
I did a supervised classification of land cover and I need to export the Validation error matrix to .csv file. When using 'Export.table.toDrive' an error message 'Invalid argument: 'collection' must ...
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1answer
65 views
Can mosaic dataset be used as input to ArcGIS Pro's Image Classification Wizard?
I am currently not licensed for the Image Analyst or Spatial Analyst extensions of ArcGIS Pro. However, I am contemplating trialling/purchasing Spatial Analyst to perform image classification on a ...
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90 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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1answer
178 views
Beginning Image Classification? [closed]
I'm a beginner with remote sensing and have the task of creating a land use/land cover map of a region in India from IRS imagery. I've never performed an image classification before, although I do ...
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0answers
119 views
Appropriate resolution of images for image classification? [duplicate]
I am attempting to perform image classification on some maps that I have in PNG format. This classification is failing due to there being too many many pixels in the training samples (I appear to be ...
3
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1answer
2k views
Building confusion matrix for image classification using SAGA?
I did a supervised classification of a Landsat image subset using my training data polygons. I used SAGA GIS for that and everything worked out fine. Now I am stuck since I have no clue how to ...
