Questions tagged [classification]

The process of sorting or arranging entities into groups or categories; on a map, the process of representing members of a group by the same symbol, usually defined in a legend.

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ENVI 5.1 - ANN Classification - Background was classified into one of the class

I'm new to Remote Sensing and I'm having trouble in ENVI 5.1 where the background was classified as one of the classes in the ROI I used, which is not right. How can I exclude the background or at ...
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PyQGIS 3.4: otb:unsupervisedkmeansimageclassification -> AttributeError: module 'processing' has no attribute 'runalg'

I'm trying to classify a raster with PyQGIS: import processing processing.runalg("otb:unsupervisedkmeansimageclassification","FalseColor.tif",128,None,100,3,1000,0.95,"class.tif",None) The python ...
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163 views

Is the Random Trees Classifier in ArcMap 10.5 equal to Random Forest?

Is the Random Trees Classifier in ArcMap 10.5 the same as what is named Random Forest in other applications/software? I see that the parameters are the same and the design seems the same, but I need a ...
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Performing Object Based Image Analysis with NAIP?

I use NAIP imagery (primarily in QGIS/GRASS) for agricultural analysis. I want to separate out objects such as grain silos, farms, buildings, &c. using segmentation and classification. Is this ...
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How to assess significant land cover changes using Chi-square test?

I have a series of land use maps at different times as a result of a classification process on Landsat images. I am mapping 3 different thematic classes : bare soils, vegetation and croplands. I ...
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Extracting specific roads from raster image using ArcGIS Desktop?

I want to create a line shapefiles of white roads from the raster file (screenshot1) using ArcGIS:. My idea is to use ArcScan toolbar, but first of all I need to classify roads pixels values from ...
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Maximum Likelihood Classification says there are 0 classes when there should be 5

I'm trying to do an image classification. I created a polygon with 5 different classes (identified in the Id column; 1-5). I then created a signature file (which took about an hour to complete). When ...
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Copy class in higher level in eCognition

I use eCognition to do classification. I do segmentation and I class it in level-1. Then I do segmentation in level-2. How to copy class from level-1 and paste the class in level-2 ? There is 'Copy ...
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Data type doesn't match error in Sieve filter

I classified some land cover types in aerial image with Erdas Imagine, now I want to remove classification errors showing very small areas. I tried to use Sieve filter, but getting error notification "...
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220 views

How to export training area information?

I did a supervised classification of a whole Landsat 8 image with 700 Rois (training areas) with the Semi Automatic Classification Plugin. I want to export the class names, the coordinates and the ...
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OBIA following connected components segmentation in Monteverdi2

New to Monteverdi2 and OTB. I just finished a connected components segmentation using the Segmentation module and the large-scale vector output mode for large datasets. How can I filter the output (...
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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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Error while object-based classification

I have code doing the object-based classification. https://code.earthengine.google.com/7ab0276a205e9157c2681b8341db6ab4 However, I encounter this error Error generating chart: Image.reduceRegion: ...
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supervised classification in grass gis

I am currently using GRASS GIS 7.4.1. I need some help here: when loading a geotiff made in QGIS to GRASS GIS, the bands that make the image are split (e.g.clip1@permanent, clip2@permanent, & so ...