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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4
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1answer
1k views

ISOdata classifier in QGIS?

Is there a function that produces an ISODATA unsupervised classification in QGIS? The only unsupervised classification function I can find is a KMeans.
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62 views

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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0answers
555 views

Remote sensing Classification and texture analysis compared with QGIS zonal statistics

I am Using Geomatica to analyse suburban spectral signature in Las Vegas. Ran a texture analysis on all band images. Combined texture bands with original image bands to run an unsupervised ISODATA ...
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3answers
201 views

Landsat 8 striping/banding citation

Does anyone have or know a citation for the Landsat 8 striping that affects some scenes (Brazil shown here). It's apparent in all bands (B3 here at 100% stretch) and is present in both RAW and ...
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1answer
256 views

Creating new field with values from different fields QGIS [duplicate]

I have combined different layers (vector) in a merged layer. All layers had one specific land-use type, so now the new layer has fields called 'tree', 'paved', 'building', 'water' and 'plants'. All ...
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1answer
34 views

Question about storage space (multispectral imagery vs. classified GIS rasters) [closed]

I have a quick question about storage space in ArcGIS. When I have limited storage space, I am trying to figure out which one on average takes up more space: multispectral images or classified GIS ...
4
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1answer
617 views

QGIS - Orfeo Toolbox: how to run support vector machine classification?

I am trying to classify SPOT images with the support vector machine classification in Orfeo Toolbox with QGIS. I installed Orfeo Toolbox with OSGeo4W. I have made a ROI image with 600 training samples ...
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1answer
278 views

Can anybody help me to know the type of land covers in DIVA GIS data?

I have dowloaded the country mask land cover data from DIVA GIS website. I don't see the name of different types of land covers.
2
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2answers
237 views

Interpolating LiDAR scattered ground data?

I wonder if someone can give me a hint on how to interpolate sparse data. I have a 1km by 1km tile located in a dense rain forest area. Original LiDAR data are 37,395,021 points. I have played with ...
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2answers
2k views

Stratified random sampling with Google Earth Engine Error

I am trying to sample points from a classified raster using Google Earth Engine, but am running into some problems. I developed a script based on the Classification video located here. Here is a toy ...
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1answer
337 views

QGIS saga supervised classification [closed]

I'm using QGIS 3.0 with the expanded SAGA options. I created a training file in SAGA standalone that I am using, but would prefer the GRASS kappa comparasion options. I have already performed the ...
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1answer
928 views

Implementing a classification on Google Earth Engine

I am attempting to implement a classification based from a decision tree (attached as image below) where there are 5 classes. These classes are based off the different water reflectance values in ...
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2answers
621 views

Erdas Imagine Error: Performance warning: Covariance calculation requires stack processing but input layer stack isn't suitable. How to solve it?

I am collecting signatures right now and when I am adding them to the Signature Editor Erdas says: Performance warning: Covariance calculation requires stack processing but input layer stack isn'...
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1answer
592 views

Thematic layer in ecognition

I want to assign class by thematic layer in ecognition. I have digitized road edges and I want to classify the roads in my 'road class' using the shapefile (polyline) of my roads. How do I do this?
2
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1answer
41 views

How does MERIS collect vegetation height data?

In GlobCover 2005 and 2009 project, the sensor used for spectral data collection was MEdium Resolution Imaging Spectrometer (MERIS). It observes the Earth in 15 spectral bands in visible and near ...
0
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1answer
119 views

ArcGIS Desktop Classification Histogram

Is there a way to access the classification histogram which is used when classifying data in ArcGIS desktop? The background is I have a series of data layers for which I need to use the same ...
2
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0answers
135 views

Supervised classification using endmember spectra (using ENVI 5.1)

We are trying to map land cover classes over a small watershed. We have selected training sites (during a field campaign in early 2017) and determined their spectral profiles on a Landsat 8 image ...
13
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1answer
6k views

Using Orfeo Toolbox object based classification in QGIS tutorial/workflow?

I have a set of aerial photos of vegetation which needs to be classified. Instead of using manual interpretation, I want to try using Object-Based classification based on the Orfeo Toolbox in QGIS ...
0
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1answer
670 views

Doing supervised classification for images on ERDAS?

i want to do a supervised classification for images on ERDAS, using GIS, i clipped the areas i want to use as training/signature from the original images. but i just can't create a signature file, ...
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347 views

R: Can raster predict function pass to predict.rfsrc (a prediction function in a parallel verion of RandomForest)?

It seems that raster predict function can pass to predict.randomForest by setting the "type='response'". I am using a parallel version of randomForest package called the "randomForestSRC" and I am ...
2
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0answers
220 views

Importing classification bitmap made by another software into QGIS?

I am currently trying to import a classification bitmap made by our own deep learning software into QGIS. The classification is saved in a TIF file, the classes are 8-bit integers. We have the class ...
2
votes
1answer
110 views

How to classify vegetation in 500x500 m polygons in a very coarse way in QGIS

For a simple species distribution map for the Dutch Wadden island of Terschelling, I want to give each 500x500 m polygon (reference grid = EPSG 28992) a specific color that coarsly corresponds with ...
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2answers
136 views

Getting IndexError while classifying .tif using GDAL python

In the following code (derived from code written by dmh126) I want to classify .tif file based on it's pixel values after converting it into an array. I think there is some mistake in for loop which ...
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0answers
131 views

Extract percentage slope [duplicate]

I have a slope created in percentage of declivity and I class this slope in some ranges (see the image), and I need to know how much % in 0 to 15 in that slope, how much % in 15 to 20 range.
2
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1answer
94 views

Transfering vector Style classification into Attribute table in QGIS?

I have a shapefile with a few thousand shapes, each with a specific value. Using Graduated classifcation, I can classify these shapes into ten categories based on value ranges. I'd like to use these ...
2
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2answers
2k views

Counting plants in aerial images from UAV [closed]

I want to extract the number of plants per row in a crop land. I have and RGB mosaic from UAV orthorectified aerial images. I would like to be able to identify single plants in order to count each ...
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1answer
120 views

Using ArcMap for Image Classification?

I am trying to classify an image with SVM and RF in ArcMap. I have trained the classifiers and have the classifier definition files. I tried to classify but could not get RF and SVM from the drop-down ...
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2answers
3k views

Reclassifying raster layer with certain colors for value ranges in QGIS?

I'm using QGIS. I want a raster layer with 6 different colors each color representing a certain value range (e.g. -1 to 0 red, 0 to 0.2 orange). In the layer style menu I can only approximate colors.
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0answers
1k views

Classify image using segmentation analysis using QGIS and OrfeoToolbox

I am working on a project where we have made a RGB orthomosaic using a drone which I want to classify using QGIS. I am not a fan of unsupervised classification, and I started exploring the ...
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1answer
655 views

Maximum Likelihood and Random Forest Classification [closed]

Which classification is best for Crop mapping? Random Forest or Maximum Likelihood?
2
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2answers
3k views

LAS dataset to raster with ground points only [duplicate]

I'm trying to make a raster from an LAS dataset. I want to only use points classified as ground, but I can't figure out how to do this. What I've tried is: Create LAS dataset from 2 .las files. ...
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2answers
622 views

Cleaning LiDAR points that classification algorithm misses?

There are numerous methods for classifying ground and not-ground points from raw LAS point clouds. They all do a great job, depending on local circumstances, but inevitably even when algorithm and ...
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4answers
1k views

Exporting ground returns (.las) from classified point cloud?

I have lidar data that is classified as several categories (water, ground etc.). I need to open this lidar data in some software (it will be great if it would be a open source software) and delete a ...
0
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1answer
267 views

Random Forest Classification of Landsat8 Image gives invalid/noise output

In my previous question (memoryerror in Supervised Random Forest Classification in Python sklearn) encounter further issue on random forest classification output. The python code runs fine, but the ...
2
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1answer
318 views

Getting rural/urban classification from Zip Codes

I have a dataset containing GPS coordinates and zip codes of locations from different regions in Spain, and I need to classify them as rural or urban based on either of these two information sets (and ...
4
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1answer
4k views

Training signature file for supervised classification in ArcGIS Desktop?

I want to do supervised classification in ArcGIS 9.3. I have a 321RGB composite of a pretty good quality which I want to use for supervised classification. How can I create signature file which ...
4
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2answers
972 views

Classifying raw LAS data as bare earth in ArcGIS for Desktop?

I have a raw LAS data that has only one return (no second/ third.. return) and not classified yet. The only information I have is intensity and elevation. Is there any way that I can classify bare ...
0
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1answer
2k views

memoryerror in Supervised Random Forest Classification in Python sklearn

I have Landsat 8 preprocessed image I want to classify using random forest(RF) classification in python. The size of the image is 3,721,804 pixels with 7 bands. I have 250 training data shapefiles ...
0
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1answer
159 views

How can I classify GPS points with road type?

I have a road database in .osm.pbf format; I want, for a long list of GPS points, to classify whether they fall on (with a margin of, say, 20m) Highway: motorway, trunk, motorway_link, trunk_link ...
3
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2answers
496 views

Finding tree canopy width using PDAL?

I want to classify (and separate) houses from trees (high vegetation) in point cloud data using PDAL. I use height filter for this purpose. Our high Vegetation lies in the range between 5 and 10 ...
4
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1answer
82 views

Why won't ogrinfo write to new column using informaiton from previous columns?

I'm having problems classifying an area of mixed forest using ogrinfo. I have an .sqlite file which contains the three columns; proportionclass1. proportionclass2, proportionclass3. I'm trying to ...
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2answers
1k views

Unsupervised classification using ISODATA clustering in R

Is there a way (e.g. package) to perform an unsupervised classification using the ISODATA clustering algorithm in R?
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0answers
264 views

Importing 1000s of svg symbols into QGIS 2.18 [duplicate]

Does anyone know a way to import 1000s of svg symbols into QGIS without having to painstakingly click on every single XML file to import? I created SVG files (with xml) of all of the CAMUTCD sign ...
0
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1answer
82 views

Avoiding overestimation in impervious mapping using raster/shapefile training data?

I have tried several methods including unsupervised classification, supervised classification, random-forest classification, and spectral indices methods to estimate the amount of impervious surface ...
1
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1answer
174 views

Batch processing multiple files with MCC-LIDAR?

I want to classify ground points from multiple LiDAR tiles (.las files) using MCC-LIDAR software. I already made some research and I have found this sourceforge thread; however, it is not that clear (...
1
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1answer
194 views

GrassGIS process for DTM of UAV point cloud [duplicate]

Using grassGIS I am attempting to produce a DTM (remove buildings and vegetation) from the las point cloud. Unfortunately the point cloud exported from dronedeploy.com does not distinguish first and ...
0
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1answer
58 views

point count from in Inverse Distance weighting procedure - QGIS

I have conducted an interpolation using IDW procedure. I have vectorized the interpolation in order to be able to specify a 3 class clasification. I have additional point dataset indicating the ...
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0answers
125 views

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 ...
0
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2answers
716 views

Applying SLD file exported from QGIS in GeoServer - why is color not applied?

I was trying to put style of color classification that was created in QGIS. It works in Geoserver but the colors are not shown. It is always single color. I have read that this is often a problem with ...
2
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1answer
954 views

Possible to use same signature file to classify images from different years? [closed]

I have Landsat images for the same area over 20 years (one photo per year in same season). I would like to detect changes occured in forested area like clear-cut and bark beetle outbreak over time. I ...