Questions tagged [image-classification]

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

Filter by
Sorted by
Tagged with
6
votes
1answer
2k 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 ...
4
votes
2answers
4k 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 ...
4
votes
0answers
124 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
votes
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 ...
3
votes
1answer
95 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, ...
3
votes
1answer
2k 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
votes
0answers
188 views

Encoding categorical variable for random forest with sklearn

I have a random forest model that works pretty well, taking a bunch of vanilla remote sensing raster data as input. I think it could be improved with addition of some information that I currently have ...
3
votes
0answers
145 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 ...
2
votes
1answer
79 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 ...
2
votes
1answer
251 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 ...
2
votes
1answer
803 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 ...
2
votes
0answers
29 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 ...
2
votes
0answers
30 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 ...
1
vote
1answer
53 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 ...
1
vote
1answer
213 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 ...
1
vote
1answer
439 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 ...
1
vote
1answer
332 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 ...
1
vote
1answer
38 views

Unsupervised classification “Error: Image.sample: Computed value is too large.”

I am trying to do an unsupervised classification for a small area in Barcelona. I uploaded an RGB image of 0.25cm of spatial resolution and I derived some indexes from it. Then, I added all the ...
1
vote
1answer
357 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 ...
1
vote
1answer
52 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 ...
1
vote
1answer
161 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 ...
1
vote
1answer
57 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....
1
vote
1answer
367 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 ...
1
vote
1answer
850 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 ...
1
vote
0answers
23 views

Need assistance in project regarding Change Detection

My task initially was to classify the area into land-use classes like forest, sparse vegetation, agriculture, river, etc I had done that by clustering the whole area and then reclassing it. I had to ...
1
vote
1answer
29 views

What is an appropriate scale and numPixels for unsupervised classification in google earth engine

I am trying to do an unsupervised classification based on a sentinel-2 composite. However, I am running quickly into time out and maximum memory problems. I am sure that it has to do with the scale ...
1
vote
0answers
22 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 ...
1
vote
0answers
32 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\...
1
vote
1answer
86 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 ...
1
vote
1answer
67 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 ...
1
vote
0answers
26 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 ...
1
vote
0answers
32 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 ...
1
vote
0answers
96 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 ...
1
vote
0answers
38 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 ...
1
vote
0answers
24 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 ...
1
vote
0answers
60 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/...
1
vote
0answers
75 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 ...
1
vote
0answers
84 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 ...
1
vote
0answers
162 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 ...
1
vote
0answers
215 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 ...
1
vote
0answers
127 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-...
1
vote
0answers
239 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 ...
1
vote
0answers
191 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 ...
1
vote
0answers
98 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? ...
1
vote
2answers
68 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 ...
0
votes
1answer
68 views

No Data was found error after applying a MaxEnt classifier (GEE)

I am trying to redo this tutorial: https://developers.google.com/earth-engine/classification, using the MaxEnt classifier with my data. Code: https://code.earthengine.google.com/...
0
votes
1answer
277 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/...
0
votes
1answer
27 views

Techniques to map small water bodies in desert

Techniques to map small water bodies in desert I have task to map water bodies in a desert. I used landsat 8 and calculated three indices called NDMI, Tasseled Cap Wetness, & AWEIsh. I am ...
0
votes
1answer
50 views

Classification error “Layer error: Property 'class' of feature '00000000000000000000_0' is missing”

I am trying perform a Random Forest classification using an uploaded shapefile of polygons with only one class = 0. Get error Cover crop classification: Layer error: Property 'class' of feature '...
0
votes
1answer
27 views

Unable to export Testing and Training data as TFRecord using Google Earth Engine

While trying to export training (about 700 points) and testing data (about 300 points) as TFRecord, I am getting the following error: User memory limit has exceeded The code I have written, is ...