Questions tagged [confusion-matrix]
A confusion matrix contains information about actual and predicted classifications done by a classification system.
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Confusion matrix from supervised learning
I am performing a supervised classification in GEE and want to verify how well my classifier has got trained.
For this, I found a method confusionMatrix() and my respective program is
var training = ...
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1answer
349 views
Generating confusion matrix using classified image with geotiff format?
I am working on yielding a confusion matrix with importing an image which is a geotiff format. After classified by a python program, The image has two values (two classifications). However, when I ...
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1answer
889 views
Confusion Matrix R
I'm having some problems to understand the result of my confusion matrix. Here is my case:
I've run a classification (random forest) on a satellite image. To do so, I created 50 random points for ...
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1answer
389 views
Ground truthing with Google Earth
I need to obtain ground truth data of Google Earth for a certain region for the purpose of constructing confusion matrix. The data should correspond to Landcover classes.
My main aim is to construct ...
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1answer
167 views
Classification validation: Trouble with the Confusion Matrix
I'm supposed to validate my supervised classification with a Confusion Matrix, but I'm having a hard time getting what I should use as a comparison.
At first, I used the same ROIs I created for ...
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1answer
2k views
Confusion matrix in ArcGIS 10.3
How can I get a confusion matrix using specific columns in two different rasters in ArcGIS ? I have one raster of risk classes 1,2,3,4 and another raster of land cover A, B, C,D. I am looking for a ...
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204 views
Supervised Random Forest in R
I did an image classification using random forest algorithm in R. I got the result but I do not understand what does the confusion matrix shows ? I mean what does the rows and column show?
These are ...
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1answer
5k views
Random Forest out of the bag and confusion matrix
I have implemented Random Forest classifier to classify remote sensing data in R. The original code comes from here:
How to perform Random Forest land classification?
Everything works fine, but what ...
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1answer
937 views
How to interpret accuracy assessment results for classified data?
eCognition has the ability to perform an accuracy assessment for classified data by using an error matrix based on a TTA mask. The image shows the results of the accuracy assessment.
Is there a ...
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2answers
616 views
R: creating an error matrix from two rasters
I have two land use rasters (6 classes each) and I'd like to create an error matrix (errors of omission and commission) from them both.
The premise is that I have a very fine 'base' raster and have ...
2
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1answer
927 views
Remote sensing accuracy assessment - McNemar`s Test
I would like to know how you determine the f12, f21 parameters for use in the McNemar`s test when for example I have two confusion matrices such as below:
(where f12 = number of cells misclassified ...
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1answer
2k views
Doing Accuracy Assessment using test data from shapefile in ENVI?
ENVI 5.2.1. From a .tiff image (4 bands) I created a Supervised Classification Maximum Likelihood .dat file. Now I want to perform an Accuracy Assessment using test data from a shapefile. I've tried ...
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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 ...
