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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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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549 views

Doing change detection of land cover between 2 landsat images in google earth engine?

I am doing land use/ land cover classification of 2000 and 2018 year . I had completed supervised classification now i wanted to do change detection analysis. Please guide me how to do change ...
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46 views

Merging and Clustering Rasters using QGIS?

I have 3 rasters for three regionalized variables (r1, r2, r3). The rasters have the same projection, origin and cell spacing. Can I merge this into ONE "multivariate" raster? (ie x,y,r1,r2,r3) I ...
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25 views

semi automatic plugin v value in automatic threshold calculation

what does the 'v' defined value stands for in automatic threshold calculation in semi automatic plugin in QGIS
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60 views

Training Sample Automation

Background, in case it helps: My objective is to (eventually) fully automate the mass digitization of grain silos. To this end, I have set out to first find a way to automatically identify silos in a ...
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76 views

Photogrammetric point cloud classification

My question is regarding the point cloud classification and editing work for a photogrammetric point cloud generated using drone based imagery. My objective is the generation of a digital elevation ...
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154 views

Using Maximum Likelihood Classification and raster border in ArcGIS Desktop?

I have tried multiple times to see if this was an issue with my supervised classification, but I don't think it is. I created my training samples and created a signature file. Per my course, I need to ...
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37 views

How to Make automatic classes with algorithm in qgis modeler?

I have 1 column of numeric data in one attribute table of a layer made of points. I want to regroup this data in classes (style) with the Qgis modeler and each class must have a specific lenght that ...
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59 views

Identifying clusters in classified imagery data

I am relatively new to working with satellite imagery at 1 m resolution and am struggling with a methodology for "grouping" the imagery. Using ArcGIS, I have performed an ISO classification on some ...
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58 views

Using result raster of Semi-automatic classification to obtain spatial statistics?

I finished classification (use SACP in QGIS), and got a classificated raster. Now I want to obtain characteristics such as sum area of class, areas of different polygons separately, etc. I tried use ...
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240 views

Accuracy assessment in QGIS (Semi-Automatic Classification Plugin) without using random points?

i am using QGIS with the Semi-Automatic Classification Plugin. I already classified a Sentinel 2a scene by using an supervised classification approach. So I have trained areas all over the scene but I ...
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2k views

NumPy ValueError: operands could not be broadcast together with shapes (1,2) > (1678,2218)

My objective is to classify a Landsat 8 image using supervised classification. I have a training point shapefile data and a preprocessed Imagery. I want to use Random Forest classification method. ...
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72 views

Endmember selection when applying SAM, SVM and MLC to PCA

I intend to apply the Spectral Angle Mapper (SAM), Maximum Likelihood (MLC) and Support Vector Machine (SVM) algorithms on a hyperspectral dataset in ENVI but I am slightly confused as to how to ...
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47 views

Automating habitat classification

I’ve been tasked with a habitat classification project which is requiring me to assign thousands of empty polygons different classification types and I do not know how to automate this process. ...
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177 views

How to seperate class labels of hyperspectral images using R?

The image has different classes and different band, where the 220 bands are separated by the following code library(RStoolbox) library(raster) library(rgdal) library(caret) library(...
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99 views

What's the difference between classification/clustering and zoning?

A week ago I had an exam and there was a question: What are the main steps of zoning in a GIS? I didn't understand the question and asked the instructor what does she mean by zoning (in ...
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82 views

How to extract and export “raised field” LIDAR objects?

I'm working on Windows 10. In input, I have a .LAS "GROUND_only" LIDAR point cloud (4 millions points). We're interested in geomorphological microstructures called raised field (ground elevation due ...
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451 views

Natural Breaks (Jenks) classes as a new column values

I have .shp layer with column Length In Layer Properties it's possible to display Layer with natural breaks (Jenks) classification. It's shown below: Based on that classification I'd like to ...
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238 views

ArcGIS Desktop Supervised Classification problem

I have a complex classification problem to solve: I have multiple shapefiles containing the polygons of all the parcels of different kinds e.g. a shapefile with all polygons with maize, another with ...
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426 views

Desktop ArcGIS Training Sample Manager cannot merge training samples

I have done the following procedure which has resulted in a troubling behavior: I have a Shapefile Feature Class with multiple different areas under specific distinct description field. I need to ...
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65 views

Deciding on classification method and number of classes for mean temperature

I'm trying to decide on the classification method: natural breaks, equal interval, quantiles, or manual and the number of classes for a map showing the mean temperature of places in Canada. The ...
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141 views

Tool in ArcMap for capturing ROIs of same size?

I'm trying to run supervised classifications and need all ROIs to be the same size. I'd like to capture the ROIs in ArcMap and so far can only find a tool which allows you to draw your ROIs by ...
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218 views

Crop/ forest/grass classification in Erdas

I am trying to calculate crop land, forest and grass land to check the irrigation potential during the period from Landsat 8 image using supervised classification in ERDAS. I am finding difficult to ...
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41 views

Maximum likelihood classification- changing class colour with every layer

I created a signature file, where I defined 4 different classes, which I named and coloured specifically. When I try to use the maximum likelihood classification tool for other layers, the classes ...
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87 views

Classification of multiple values at the same point

If I have a point dataset with multiple values for the same geographic location (e.g. residuals from a regression where multiple individuals live at the same location) which I classify using quantile ...
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44 views

exclude value from feature analysis classification (ArcGIS extension)

I am using feature analysis to classify small (mm) round features from the landscape. I have calculated the circularity of each shape and I want to exclude those which are not round enough. Does ...
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56 views

how do I get percentages of classes in a classified image?

I am using ArcMap 10.3 I have two layers, one classified raster, Landsat based dNBR, where classes show burn severity, and a shapefile containing polygons, drawn based on the dNBR image and that ...
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75 views

Spectral classification for crops

I'd like to do a classification using a multispectral raster (1 Blue 475, 2 Green 560, 3 Red 668, 4 Red Edge 717, 5 Near IR 840). I'd like to classify the crops (kiwi plants). I tried a few ...
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459 views

Needed help to launch SVM classification in eCognition

I would like if somebody help me to launch SVM classification in eCognition. Have you met any tutorials? I was searching through ecognition community, but there I find only basic KNN supervised ...
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37 views

Band Separation from regular cameras

I have removed the IR block filter from a Sony digital compact camera so it has become multispectral (in a way). In addition to that I placed a IR pass filter, so it only captures photos in the Near-...
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138 views

Using same ROI/Signature for classifying spatially different rasters?

Using QGIS SCP Plugin, I have classified a raster of a state. Can I use the same ROI/signatures to classify rasters of other states?
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62 views

qgis Semi automatic classification pluggin how to add text to rows in attribute table

I want to use a previously created shapefile as Training shapefile in the semi automatic cassification pluggin. Therefore i added 4 fields to this shapefile: Macro_ID (int), MCl_info (text), Class_ID (...
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1k views

How to create ROI in Semi-Automatic Classification plugin QGIS

while trying to classify landsat images, I get the following problem: I click on the pixel I want to define a ROI, but the ROI polygon that the plugin creates appears in a different part of the image ...
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31 views

Does fixed classes exist in QGIS?

I'd like to create several images of voronois polygons in QGIS; each images having differents values joined to the voronois. I tried to load a qml style with the values I want to keep (8 classes : 0>...
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91 views

How do I use Multispec for Landsat data?

It seems that I only can use the Clustering if I want to cluster only one band data.. If I open up more than 1 band (in one image), the cluster toolbar is disabled? optional: Is there any free ...
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1k views

Performing Maximum Likelihood Classification in R

I'm trying to perform maximum likelihood classification of landsat imagery using R, I have been searching for a package that implements it but so far I haven't found it. What is the easiest way to ...
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40 views

lulc mapping from modis surface reflectance

can i prepare LULC with 10 classes from MODIS surface reflectance level 3 data 500m resolution... if so what are the preprocessing techniques should i do on the data..i have to prepare LULC for yearly ...
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671 views

ENVI: Postclassification, remove pixels of certain size

I did a classification over multiple Landsat imagery in ENVI 5.1, which turned out not too bad (ice and snow in Cyan in the picture below). Now I am about to do a postclassification to filter out ...
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100 views

Reclassifying based on neighbour polygons using QGIS?

I have a polygon shapefile and each one has one class attached. I want to reclassify one of them based in the neighbours. For example, I have a polygon with class street and I want to reclassify to a ...
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231 views

Segmentation Violation in ArcView 3.1 while performing UpdateLegend?

I am loading a ".avl" legend file into ArcView 3.1 and I am plagued with a recurring Segmentation Violation Error when I execute the updatelegend command in the theme. It looks like the legend file ...
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119 views

From classified image to topology in ArcInfo

I have some coastal 4 band imagery that I have classified to designate land, water, and undetermined. I want to convert this to polygons with topology, and significantly simplify the polygons. If I ...
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1answer
152 views

Seeking 4-band satellite imagery?

I'm looking for good quality, fine resolution 4-band satellite photos of Sweden for academic use (and I'm willing to pay for it). What I'm after is as detailed as possible photos of certain part of ...
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2answers
102 views

Image Classification on Photos From Camera?

I have some photos of 1X1 meter plots that were taken with a NIR digital camera. They have been georeferenced, corrected, etc. I am interested in performing an image classification for the vegetation,...
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44 views

Multi-temporal classification in Google Earth Engine - clustering and grouping based on time sero

I am working on my master thesis on multi temporal classification of LULC using S2 imagery in Google Earth Engine. The goal: to distinguish urban area from the landscape in the Inner Niger Delta. ...
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13 views

Printing label and associated pixel value from raster?

I have created a classified raster using the ArcGIS Pro image classification wizard. Unfortunately, I am unable to get the table of pixel intensities & associated labels to export to .csv. When ...
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23 views

Accuracy classification in Google Earth Engine

I'm trying to perform a supervised classification of a composite image from a Sentinel-2 time series. I'm using cart as classifier and a set of points as trainers. Once computed the classification I'm ...
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17 views

eCognition Accuracy Assesment Tool problem

I'm narrowing down a vegetation RF classification in eCognition along a river course, it's going very well but I've run into a problem with my Accuracy Assessment. The gist of it is that my class sums ...
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34 views

Convert output of Image Segmentation/Classification (From land-use classification) into different shapefiles

I am performing the Landuse Classification on satellite imagery. I have classified my image into different categories. I have the shapefile of the original image, now I want to create the separate ...
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15 views

Can't perform supervised image classification in ArcMap - can't view histograms or scatter plots

I'm having problem performing an image classification in ArcMap 10.4.1. I'm trying to classify a simple 3 band PNG file, all though I have also tried with other formats and other types of images. As ...
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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 ...