Questions tagged [image-classification]
Image classification refers to the task of extracting information classes from a multiband raster image.
64
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30 views
Number of pixels for training areas in Semi-Automatic Classification Plugin
I'm trying to make a supervised classification using QGIS and Semi-Automatic Classification Plugin using high resolution images (5 m). I wonder how many samples I need to have for an efficient ...
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14 views
When creating a confusion matrix, can you have more ground-truth points than the recommended 10-times the number of classes you have?
Using ArcGIS Pro, I classified a field of grain sorghum (supervises, pixel-based support vector machine) using 5 classes: Soil, Shadows, Leaves, Heads, and Ground targets (this was a UAS study). The ...
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34 views
gtk.css:2:33: Failed to import in Grass GIS
When first I run GRASS GIS 7.6.0, there is an error message :
(gis_set.py:4772): Gtk-WARNING **: 16:05:43.648: Theme parsing error:
gtk.css:2:33: Failed to import: Error opening file
/home/mega/....
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1answer
61 views
Implementing proportional stratified random sample in R
I've completed a landcover classification on an Landsat Image and would like to start an accuracy assessment. I'd like a stratified random sample that has a sample number that varies based on each ...
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1answer
41 views
How to randomly stratify sampling within landcover classes?
I'm working on an accuracy assessment of a classified landsat image and I'd like input on the best possible way to generate random points across both the classified image and a ground truth image I ...
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0answers
26 views
Get polygons of crop classification from the Land Parcel Information Systems (LPIS)
I'm trying to get\download polygons of fields with crop type. There is a USA database called cropscape which is very friendly. There is also a European one called Land Parcel Information\...
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33 views
Computing producer and user accuracy for each class in Google Earth Engine supervised classification
I know I can get a confusion matrix and an overall accuracy, but is there a way to calculate producer and user accuracy for each class separately from the Google Earth Engine?
This is my validation ...
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1answer
200 views
User memory limit exceeded error for classification in Google Earth Engine
I am trying to do classification using cart. Given below is the code that was used, but I am getting 'user memory limit exceeded' error. Is there no other way to rectify this other than by reducing ...
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40 views
Using point shapefile as training data for example based classification in ENVI
I am trying to undertake a supervised object based classification of vegetation types on a sentinel 2 image. I am having trouble using a point shapefile as training data in the ENVI example based ...
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1answer
40 views
Checking accuracy of supervised classification method in ArcGIS Pro
I have a question about my image classification method in ArcGIS Pro 2.4.
I'm looking at a field of grain sorghum and doing a project that requires me to define certain features within the image for ...
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0answers
20 views
Creating training set of strike and dip data (structural geology) using ArcGIS Pro [closed]
I have been using ArcGIS Pro for the first time, and am attempting to create a training set of strike and dip data (structural geology.) I have created the polygons, after creating a new ...
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1answer
71 views
Weed Identification With QGIS [closed]
Does anyone have any experience trying to locate weeds in agricultural drone images?
I am currently using Dztesaka classification tool to find weeds. It works pretty good. But there may be some ...
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22 views
Number of features does not match for my classification of each pixel
I'm running a rating on a my clip from Sentinel-2 as a reference to the diagram shown on: https://github.com/ceholden/open-geo-tutorial/blob/master/Python/chapters/chapter_5_classification.ipynb
...
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22 views
Export classifier from SCP Plugin for use in other image classification
I have run a classification using the SCP plugin in QGIS.
I want to recreate these results in a neighboring area and I am looking for help to see if it is possible to save the classification ...
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1answer
31 views
Generate LULC maps using Sentinel data of European Space Agency?
I found out that Sentinel data is of 10m x 10m resolution whereas LANDSAT data is of 30m x 30m resolution. Did anyone come across research in which Sentinel data is used for making LULC maps or is ...
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1answer
130 views
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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0answers
25 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
157 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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0answers
27 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
43 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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0answers
80 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
60 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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33 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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0answers
31 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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0answers
26 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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0answers
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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253 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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0answers
21 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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0answers
32 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
74 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
231 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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47 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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0answers
26 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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0answers
45 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 ...
3
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0answers
136 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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0answers
182 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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1answer
144 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 ...
3
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1answer
83 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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83 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
145 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
266 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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0answers
195 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
154 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
84 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
375 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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0answers
108 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
52 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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0answers
203 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
48 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
146 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 ...
