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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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Sentinel2 classification in R [duplicate]

After preprocessing of Sentinel 2 imagery, now I have Level 2 of Sentinel 2 which has 10 bands. I want to run classification of this imagery in R. However, I have never learned R. So could you please ...
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1answer
19 views

How do duplicate script on Google Earth Engine code editor

I'm following https://docs.google.com/document/d/1bRCEB8ybRUp2D6vFc7mjqDMG2bpmCd2iTPQIEern0mk/edit#, its about classification and regression. I followed the regression part then I'll do the ...
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17 views

Semi-Automatic Classification Plugin install failure

I'm trying to download the Semi-Automatic Classification plugin in QGIS 3.4.1 but keep getting this error message coming up. Couldn't load plugin 'SemiAutomaticClassificationPlugin' due to an ...
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1answer
23 views

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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1answer
41 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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1answer
24 views

Running Maximum Likelihood Classification?

I'm trying to run a supervised classification on a landsat 8 (L8 OLI/TIRS COLLECTIONS LAND SURFACE REFLECTANCE ON-DEMAND) imagery. I created a signature file, then ran the Maximum Likelihood ...
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1answer
30 views

How to exclude some classes from legend?

I have a raster file with 8 classifications (all numerical), however the last classification I have coloured with 'no colour' so it does not show up on the map, however I also wish to exclude this ...
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1answer
32 views

How can ee.Image.stratifiedSample() be used in Google Earth Engine to select training samples for a binary classifier?

This is a follow-on question to How can one create a binary image from a FeatureCollection in Google Earth Engine? The corresponding minimal example can be found here: https://code.earthengine.google....
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1answer
28 views

What's the difference between sample, sampleRegions, and stratifiedSample in Google Earth Engine?

According to the documentation of GEE, ee.Image.sample() samples the pixels of an image and returns them as a FeatureCollection, in which each feature has 1 property per band in the input image. You ...
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1answer
27 views

Estimating building and vegetation volume with unclassified LiDAR datasets?

I'm trying to determine the ratio of building to vegetation change (i.e. how has the volume of built structures changed in proportion to the volume of vegetation) in a city over a period of five years....
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26 views

Classification using arcpy 2.7

I'm trying to create a tool that will consume National Weather Service 1 hour precipitation radar information and then classify groundcover based on amounts per area (in mm), then output the results ...
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1answer
30 views

How can I collect training samples using ee.Image.sampleRegions() and an existing raster layer in Google Earth Engine?

I would like to sample training data from some raster data source (e.g. Sentinel-2) based on labels extracted from an already available dataset (e.g. some binary layer or classification map) in Google ...
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8 views

MTMF classification with ENVI 5.1

How do I classify a multi-spectral raster (Landsat 8 OLI) with MTMF classification? A tutorial in Harris Geospatial is still using the old version of ENVI (4.7 I think), because I tried to follow it, ...
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1answer
56 views

Plot areas by class in a polygon with Google Earth Engine

I would like to plot the number of pixels or the area for each class contained in a polygon (shape of a country). I have found the ui.Chart.image.byClass function but I don't understand how to use it ...
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0answers
82 views

Reproducing Paper Results for Land Cover Mapping of Satellite Imagery?

I am interested in training a neural network to perform pixel-based classification for land cover mapping of satellite data. In order to learn more about this interesting field I am trying to ...
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0answers
26 views

SAGA Supervised classification for grids outputs different result from SAGA standalone

I've met a problem with SAGA tools in QGIS (3.14). So, SAGA Supervised Classification for grids gives very poor results, while the same algorithm with the same inputs in SAGA standalone (2.3.2) works ...
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1answer
48 views

Sudden increase in the download size of images from GEE

I am working on LandSat 8 data to build a classifier for built up and non built up areas in a particular district. I was using the following code for classification and then to export my classified ...
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0answers
66 views

Classifying image using image segmentation in google earth engine

I am trying to classify a Landsat 8 image in google earth engine. I have to classify them object based, since I am building on an earlier research where they have used object based classification. ...
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1answer
21 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 ...
2
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1answer
34 views

Performing Supervised Classification on Sentinel Image using ArcGIS Desktop?

Is it possible to perform supervised classification on Sentinel Satellite Image with the minimum error. I compared two raster, one being the manual classification of an area using Photoshop CS6 and ...
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0answers
34 views

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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1answer
28 views

Presenting climate data over time?

I'm trying to map (using ArcMap 10.6.1) some climate change data and I'm not entirely sure how to classify the raster datasets. For this work I am focusing on four different climate change scenarios: ...
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1answer
41 views

Visualize classes from shapefile attribute table

I have a shapefile with classification and I would like to see that map in QGIS. When I open it, adding it as layer, I just see the overall area filled with the shapes of the various classes but I ...
2
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1answer
76 views

Calculate variable importance for classifications in Google Earth Engine

I am doing a simple Random Forest classification in Google Earth Engine. I try to classify upland, water and wetlands, using 25 variables derived from one year of Sentinel-1 images. The classifier ...
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1answer
38 views

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 ...
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1answer
48 views

Static traffic visualization for certain streets with the help of historical traffic data, in QGIS? [closed]

The goal is to make a static map highlighting certain streets in a city that usually have high traffic (for example, highways and main roads). I am using OpenStreetMap for the city. The streets need ...
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0answers
15 views

Getting label of feature in pre classification feature collection and assimilating it to object created?

I'm trying to write a code on Earth Engine for automatically create vegetation samples areas and associate this samples with the pre classified polygon with one of the "properties" of semiarido ...
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1answer
55 views

How can I access the different classes after I did a classification in Google Earth Engine

So I ran a Classification with Google Earth Engine, classifying forest and non-forest. After I prepared my ROI and declared some training points for each forest and non-forest (saved in the variable ...
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0answers
98 views

How to reclassify cluster image based on values from zonal statistics - Google Earth Engine

I have classified an image with 50 clusters (k-means). The next step is to reclassify the image into several meaningful classes (e.g. vegetation, urban, water etc...). I want to take an automated ...
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0answers
17 views

Is there a way to classify a satellite image in arcgis using all bands for more accurate classification?

-I want to classify a Sentinel 2A image which has 12 bands and a Landsat 8 satellite image wich has less bands. -How do I overcome the mountains shade? -In theory there would be 5 classes if you ...
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0answers
32 views

Google Earth Engine - problems with exporting a classified image (how to deal with noData)

I'm trying to export a classified image in GEE for analysis in ArcGIS. My image has 50 classifications (0 - 49). My problem is, after inspection in ArcGIS, it seems the border (coloured red, other ...
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0answers
53 views

Orthophoto land use classification in QGIS

I am using a CIR orthophoto and tried to make a land use classification with the use of Semi-Automatic Classification Plugin in QGIS. I work in QGIS 3.2 but I get errors that my ROI are too small (...
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1answer
125 views

GEE unsupervised classification (clustering) of Landsat 8 cloud free composite - User memory limit exceeded

Can anyone explain why I am getting the memory limit error when trying to classify using the wekaKMeans algorithm over a cloud-free composite of Bangladesh? I'm trying to differentiate mangrove pixels....
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1answer
59 views

Classification erosion - semi-automatic classification plugin

I get an error when working Classification Erosion tool in Semi-automatic Classification Plugin (SCP). I use QGIS v3.2.2 and SCP v6.2.4. The tool is not changing the pixels of the raster layer and ...
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1answer
128 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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1answer
39 views

What Kind of Layer to Add Building Info? [closed]

I am new to QGIS (two days ago) and have been given a task to identify buildings, store info on them (building year, color, road type) in a layer and then export the info in a CSV file. I have fuddled ...
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1answer
39 views

Discerning dwelling types in QGIS? [closed]

In QGIS, I want to discern between a number of building types, based on topology. I have data on buildings, parcels and addresses. I'm having a hard time to discern between row/terrace, end-of-...
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1answer
26 views

Looping select by Attribute height interval and exporting to individual shapefiles using ArcGIS Desktop?

I have had a look at the existing Q&As but none of them seem to be addressing this in detail. I have a building footprint shapefile which contains a height field. I would like to group buildings ...
2
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1answer
25 views

Supervised Classification in gvsig - fails repeatedly

I am teaching an ad hoc class in remote sensing, where students are bringing their own laptops I wanted to go over how to perform a supervised classification in the open source software I had chosen -...
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3answers
79 views

FME Combine Values

I am new in FME and have a table with 10 columns. Every column contains different values. I want to create a new column, which contains a combination of the other columns and for every combination of ...
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0answers
66 views

Choosing statistical method for determining different crop types? [closed]

Task: Determining different crop types from satellite imagery. Tools at hand Training data set which includes RGB, longitude and latitude, NDVI and crop type for each pixel (10m by 10m) Test data ...
0
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1answer
74 views

Why iso cluster unsupervised classification detect less clases than desired?

I have this RGB jpg georeferenced map image: When I do unsupervised classification with 5 classes It only gives 4 classes The original image was generated from CS6 and is georeferenced.
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2answers
164 views

Sentinel 2 Bands + Deep Learning

I am trying to classify 9 different classes of Land use deploying Resnet Architecture. Sentinel images come with 13 bands and in RS we normally combine different bands for different classes for ...
0
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2answers
119 views

Creating signature file for classification in ArcGIS Desktop?

I am trying to classify a raster image with the Maximum Likelihood Classification tool. I understand from the ArcGIS Resource Center I need to input a signature file in the second field to tell the ...
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0answers
26 views

Obtaining reflectance value after supervised classification in QGIS/SAGA

I want to extract the reflectance values of my classes/training inputs but after supervised classification i.e post classification. Is there any tool or process to do it in QGIS/SAGA
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1answer
62 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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0answers
31 views

LiDAR Point Classification Program Recommendation [duplicate]

I'm working with terrestrial LiDAR data to create a reference data set and need to classify the points into either ground points or non-ground points. Automated/semi-automated methods don't seem to be ...
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0answers
18 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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0answers
21 views

ML classification: signature file vs. train classifier

There are two different ways to conduct a maximum likelihood classification in ArcMap. Either you create a signature file from the training samples and than choose the maximum likelihood ...
2
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2answers
355 views

How to change border style for classified data?

I would like to classify my layer according to two categories (for example year and type of land) and would like to show these classifications with a different colour of the border (for 'year') and ...