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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12 views

SVM probability output in Earth Engine [closed]

I'm trying to predict burnt probability on an image with a SVM, but I can't get a probability output, I just get zeros and ones. It's a binary classification (burnt and unburnt), the feature (NBR) is ...
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17 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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43 views

Calculating proportion of pixel containing vegetation (from sentinel 2 image stack)

My task is to perform a supervised classification of landcover across a huge (20,000+ hectare) property. I need to classify into three classes: forest, regenerating trees, and soil. We use s Sentinel-...
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27 views

Create categorized renderer from styles won't color categories

I'm trying to use the tool named 'Create categorized renderer from styles' When I classify my layer by an attribute table value in layer properties/symbology/categorized I get different colors ...
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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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1answer
66 views

How to mosaic 3 different layers that do not overlap and make them into 1 layer

I have 3 different independent layers which I want to merge into one layer: For creating those layers, I have calculted NDVI, calculted the mean and then I have created one layer that is lower than ...
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19 views

Export classified Landsat 7 image - Google Earth Engine

I am trying to export images of MODIS landcover classifications and classified Landsat 7 images. However, my codes only result in black images rather than what I see if I add the layers to the Map. ...
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42 views

More precise control over QGIS symbology classification

In QGIS, I would like to classify my graduated symbology by standard déviations, as such: . However, I find that the behaviour seems erratic or hard to control, and I can't choose the number of ...
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46 views

Export classified land cover types as table - Google Earth Engine

My question relates to extracting the area of different land cover types in a region. So far, I classified a Landsat7 image using MODIS data as classifier. When I choose a point on the Map, the ...
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1answer
25 views

Adding value options in feature attribute table?

I cannot figure out why it says NULL, my goal is to be able to pick values from a classificator table made in Excel and imported into QGIS as a vector layer.
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31 views

Categorizing Layers in ArcGIS Pro Like QGIS

Is there a way in ArcGIS Pro to easily and quickly categorize, display, and hide layers as there is in QGIS (example in image)? This feature in QGIS makes it easy to work with layers that have the ...
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1answer
35 views

Categorizing data by partial attribute

In QGIS 3.4 I'm trying to categorize a column in my attribute table which contains a code, of which I only need the (highest) number (which implies a gradation). This probably means I need an ...
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1answer
21 views

Use icons for polygons based on Boolean values from attribute table as secondary symbology

I have a multypolygon-shapefile of government districts in Germany with two columns, "population density" and "yesno": The first has integer the second one Boolean values. I have already colored the ...
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1answer
21 views

Get data monthly from Landsat 8 image-collection

I am doing classification with Landsat 8 and other information to predict farm land use. I want to use monthly data(Monthly composite) rather than data from 2015-01-01' to '2016-12-22'. I think I ...
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17 views

making image to geometry with mobis images [closed]

I am trying to do the classification of farming areas and I do not want to include the city and forest areas. so I want to use land without forest and city. I want to make forest_and_city to geometry ...
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1answer
54 views

Object-based Classification in Orfeo ToolBox

I have a multispectral camera with 5 bands (r, g, b, red edge, NIR) and I would like to classify plants object based with Orfeo ToolBox. I am flying with the drone close to the plants and have an ...
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37 views

SNIC Algorithm and Classification using the clusters in Google Earth Engine [closed]

I have run the SNIC algorithm in GEE and want to classify the clusters into two classes. I have 2 specific doubts. Not able to compute cluster statistics like std dev( Layer is null). Not able to run ...
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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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1answer
33 views

Locations From image.sample() are Different From Input Data in Google Earth Engine

I found an issue that the locations of the sampled points from ee.image.sample() do not match the locations of the input points. Above, the image is extracted MODIS 1km band, and the red points are ...
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14 views

Vector to Raster

I traced land use as forest (purple) and non-forest (Teal) in my study area of 117sq.km. from google earth. I have attached a copy of the landcover file which I have created. I need to convert this ...
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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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1answer
36 views

Classifying land use in polygons using aerial imagery

I am trying to use the shapefile here: https://environment.data.gov.uk/DefraDataDownload/?mapService=EA/HistoricLandfill&Mode=spatial to work out how much of the sites are covered in trees. I ...
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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 ...
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24 views

Merge and CLASSIFY ImageCollections with different pixel size

I am trying to perform a classification on a merged imageCollection that includes median annual images for both the Landsat 8 and Sentinel-2 satellites. To merge the two datasets, I resampled all ...
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23 views

Classifying if a coordinate lies on a building

I'm trying to classify if a given coordinate (latitude, longitude) lies within a building footprint, street or elsewhere. To accomplish this task, I'm using OSM data and the Overpass API. I wrote the ...
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29 views

Generate LULC maps using Sentinel data of European Space Agency?

I found out that Sentinel data is of 10m x 10m resolution whereas LANDSAT data is of 30m x 30m resolution. Did anyone come across research in which Sentinel data is used for making LULC maps or is ...
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24 views

Calculating area of classified pixels in Google Earth Engine for each feature in featureCollection

I have run a random forest classification on my three class system, but now I would like to determine the area of each class within each feature in my featureCollection. Can I add this as a property ...
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1answer
64 views

Why can't I perform supervised classification using Landsat 8 SR images in Google Earth Engine?

This is the link to the code. https://code.earthengine.google.com/ba342d996547c4fa8151bc99052036cf This error message appears var ColecaoL8 = ee.ImageCollection('LANDSAT/LC08/C01/T1_SR'); var ...
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1answer
122 views

Is there a Post-classification Majority Analysis feature on Google Earth Engine (Similar to ENVI)?

In ENVI there's a Majority/Minority Analysis function that allows you to to change spurious/"wrongly classified" pixels within a large single class to that class (it also allows you to enter kernel ...
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23 views

Calculating range of values for a class for landscape analysis

I am working on a large scale landscape analysis in Qgis: on several raster layers i made (using SRTM dem as source data) i am doing a reclassification procedure. Reclassification is based on a set of ...
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1answer
70 views

Difference between classification methods with Laspy

I need to add classification to create a LAS file. I used the code below but it was miss-classified. Is there any problem with the code? And what is the difference between: out.file classification ...
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37 views

ArcGIS symbology mis-categorizing data points

Wondering if anyone has run into this issue with Arc before. I've set up a simple symbology categorized into groups by parcel size. Size Categories: This appears to be calculating correctly for the ...
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23 views

Using object-based classification on a new set of imagery, without retraining the classification in ArcGIS Pro?

I am working with NAIP imagery for a county in PA in an attempt to create a classification scheme that I can use on other counties within the state. I'm very familiar with the process of creating a ...
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1answer
102 views

Using NDVI along with regular RGB and NIR bands for image classification

Is it plausible to use NDVI along with other regular bands for image classification related data processing? Recently, I came across a comment that RED and NIR band might interfere with NDVI or vice ...
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26 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 ...
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72 views

K-fold validation on Google Earth Engine

I have a satellite image "india_image" and data in form of a feature-collection "ft". I want to perform k-fold validation on this data in Earth Engine. How to do so? var india_image = ee....
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60 views

Getting areas of different classes in Google Earth Engine?

I would like to know if it is possible to calculate the area resulting from a classification. he been reviewing some sections, I found this Calculating areas of different classes in Google Earth ...
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111 views

Performing time series supervised classification on Google Earth Engine?

I am quite new as I only use google earth engine for a couple weeks. So if I missed anything feel free to advise The goal want to achieved is to perform time series classification on Google Earth ...
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27 views

Problem showing classes on Supervised Classification using ArcMap

I'm using ArcMap 10.5. With the "Image Classification" tool I create all the polygons with the training areas for each class. I use "merge" and give the name of the classes (ocean, river, urban...) ...
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1answer
101 views

Creating classification matrix for rasters with abrupt class intervals in R

I am trying to re-classify to raster images which do no have continuous range intervals which normally have been used in examples for creating classification matrix. My original data has these values ...
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61 views

Calculating classed areas of classified image in Google Earth Engine

I am attempting to calculate of area of 4 different classes in my classified map. But I am getting error "Dictionary (Error) Classification request exceeds size limit." Here is my Code: //Load ROI ...
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155 views

Google Earth Engine: convert image collection to image

I want make Supervised Classification for all images in imagecollection. I make one image with all bands, but i can't make classification, console give error: merged.sampleRegions is not a ...
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20 views

ArcMap cloud removal process

I am working with Landsat 8 data. I have performed the necessary pre-processes that I want (atmospheric and topographic correction and pan-sharpening, using QGIS and ERDAS). I am now working on ...
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149 views

Running classification on image collection using Google Earth Engine?

I have ImageCollection. composed of satellite images which shows Zebras on grasslands. The location of each zebra is stored within a point shapefile, which I uploaded as a "table" into Earth Engine. ...
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27 views

Classifying coordinates on land/on water using QGIS very slow processing issue

I'm very new to QGIS. I have a problem related to the "select by location" tool of QGIS. I have loaded 10 different layers into my map containing data of waters (rivers, canals etc.). Now, I want to ...
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94 views

Classifying coordinates on land/on water using QGIS?

I am a new user of QGIS. I'm looking for a solution for my problem. I have my own dataset providing the latitude and longitude of different unique ID's. Now, I would like to classify those ID's that ...
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69 views

Adding up several rasters to show the change

I want to add several images such that their change is shown in different colors. Such as the following in which I simply added two images in their grayscale. But I would like to have a colored ...
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1answer
139 views

GLCM measure in an object-based classification?

I am trying to classify agricultural fields with randomForest model. I will conduct an object-based classification. To do so, in the code by Ned Horning, I provide the boundaries in a shapefile. The ...
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2answers
34 views

Feature space selection for river sand classification using multispectral imagery

I want to perform supervised classification for river sand detection. I have 3 m spatial resolution Surface Reflectance multispectral imagery with B, G, R and NIR bands (Planet data). Which all ...
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1answer
36 views

Split list by chunks Earth Engine with mean

I am calculating mean temperature data based on historical data. I need to calculate the mean through the years (jan-jan-jan-jan...) and the means within a year (jan-feb-mar-may-jun...). This is ...