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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1answer
24 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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14 views

Performing supervised classification using Google Earth Engine [closed]

I would like to verify the accuracy of the model I created by comparing the data originating from the model with the data I collected. I thought for this aim to supervised classification. Following ...
4
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1answer
419 views

Pickling a Classifier in Google Earth Engine

I'm busy trying to create a widely applicable reedbed vegetation classifier that could potentially classify any given area within Europe. I already have training data for an area around the Balaton ...
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29 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
34 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
32 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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1answer
19 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
147 views

How to automatically get/assign contour height attributes?

I have quite a simple problem yet I can already guess the solution is going to be pretty complicated. I'm using QGIS and was wondering if there is a simple way for the computer to automatically assign ...
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1answer
18 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 ...
2
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1answer
58 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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0answers
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
33 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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9 views

What classification methods are appropriate for quantitative flow maps?

I would like to show emigration data on a flow map. However, my data histogram is strongly skewed to the right with a few outlier to the left. I am aware that most of the flow maps use absolute ...
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1answer
38 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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0answers
29 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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2answers
372 views

Getting and setting the symbol sizes for a graduated layer in QGIS 3

I have a whole set of maps that have graduated colors based on a set ramp and I also like to change the symbol sizes as it makes anomalous areas stand out even more. Id like to change the symbol sizes ...
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29 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
28 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 ...
4
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1answer
68 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
80 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 ...
3
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1answer
417 views

Image classification for a study site falling over two adjacent Landsat 8 scenes using QGIS or ArcGIS Desktop

I will be using GRASS on OSX to classify Landsat 8 geotiff images to create a vegetation map for a study site that happens to fall over 2 separate Landsat scenes. I seek advice about which route to ...
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0answers
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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16 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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1answer
80 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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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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1answer
146 views

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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1answer
96 views

How to Classify With Multiple Ancillary Datasets using QGIS?

I've tried using the classifiers in ArcMap which only supports one ancillary dataset and I tried using Orfeo in QGIS 2.18, though the Orfeo Image Classification tool does not accept any ancillary ...
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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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20 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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25 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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1answer
74 views

SAR spectral signatures for oil spill detection from different sensors

I have a rather general question about supervised classification for oil spill detection. I want to apply supervised classification on the ESA SNAP dark spot detection tool results. My question is: if ...
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2answers
177 views

Feature normalization (scaling) for Hyperspectral images

I have been straggling with the concept of feature normalization for the hyperspectral images. Respect to my problem I have attached a picture of my problem which clearly stands the issue which I have....
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1answer
53 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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2answers
221 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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1answer
48 views

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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0answers
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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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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1answer
873 views

Identifying shadow on Landsat image by Hillshade Tool in ArcGIS Spatial Analyst?

I would like to automaticaly identify shadows on Landsat scene in mountaineus area using Hillshade Tool (ArcGIS 10.1). I have 1 Landsat image from one date DEM (SRTM) from the same area To create ...
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0answers
85 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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1answer
58 views

Count pixels per class instance of a raster classification

I have a fairly easy problem but I can not find any algorithm for it. I have this kmeans classification of a windspeed pattern from a model output: What I want now is to count the pixels in each ...
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1answer
91 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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0answers
20 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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0answers
42 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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47 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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0answers
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
83 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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0answers
44 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 ...
3
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1answer
2k views

Randomly splitting Feature Collection in Google Earth Engine? [closed]

I am trying to do a supervised classification in Google Earth Engine and created around 50 polygons for each of my 5 categories and put them into Feature Collections and merged them into one single ...
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0answers
96 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 ...