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Geographic Information Systems

Questions tagged [image-classification]

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

30 questions
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Correct parameter setting in otbApplication

Trying to run a vector classification in Python using otbApplication. When running the same procedure through the OTB GUI (Monteverdi) all works well. But I get errors when running it through Python. ...
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9 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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23 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
50 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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40 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
48 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
21 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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0answers
28 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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24 views

Multi-temporal classification steps

Please could someone advise me on the steps to carry out a multi-temporal classification on sentinel -2 images in QGIS? I am working on a classification for crop types in an area. Up until now I ...
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1answer
33 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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26 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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0answers
72 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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37 views

Unsupervised classification raster

I'm a novice when it comes to image classification and was hoping for some advice. Specifically, ive experience in clustering of geochemical and hydrochemical data. Hard (HCA and K-Means) as well as ...
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17 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
54 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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48 views

No data was found in classifier training input afer run code in GEE

I want to classify images using three types of sample data, including yumi, xiaomai and youliaozuowu, but it shows this error 'Class: Layer Error: No data found in the classifier training input'after ...
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1answer
107 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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33 views

What indices work best for entropy computation for classifying lone standing trees?

Question: What bands or indices work best for entropy analysis of lone standing trees? Problem: In Google Earth Engine, I created a landcover classification for semi-arid africa with good accuracy....
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1answer
106 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
67 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
168 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
190 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
66 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
1k 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
329 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 ...
3
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1answer
514 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 ...
2
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1answer
44 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 ...
1
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0answers
73 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? ...
0
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1answer
157 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 ...
4
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0answers
114 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 ...