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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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28 views

How can you identify loam/clay settlements with Sentinel-2 Images when using eCognition?

I am doing my thesis research about analyzing settlements in Mali with Sentinel2 images with the use of the program eCognition (object-based). We have trouble with determining the settlements because ...
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1answer
118 views

Classify polygons with Random Forest on Python

I have a segmentation shapefile made with e-cognition containing many polygons of which a part classified for the train file. I would like to classify them by applying labels (e.g. water, vegetation, ...
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23 views

Conditional Expanding in ArcGIS Desktop?

I would like to reclassify a LC map given some conditional rules (raster with 8 classes total). Using the illustration, I would like to expand the green pixels (two distinct classes) on the white ...
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37 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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1answer
65 views

lidR (rlas) writeLAS changes values from Classification attribute?

I have a point cloud with extra attributes: class : LAS (LASFˇ v1.4) point format : 6 memory : 2 Gb extent :7498400, 7499200, 5779500, 5780000 (xmin, xmax, ymin, ymax) coord. ref. ...
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9 views

Assigning colors to specific table once, which will be used in different classifications of Google Earth Engine?

I am working on Crop Classification Assignment, in which I do classification twice in a year on the basis of major crops time periods. What I want to do is to assign Color to Unique ID of crops once ...
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32 views

What is Kappa coefficient in HSI classification? [closed]

What is the Kappa coefficient and how it is calculated in the HSI classification process?
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1answer
48 views

Converting raster symbology to vector shapefiles using ArcGIS Desktop?

I am using ArcGIS Desktop. I have a satellite raster geoTIFF, the image shows a coastal region with water, rocks, grass. To display these three features of interest, I've symbolised the raster via ...
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1answer
42 views

Google Earth Engine: Supervised Classification fusion table error

I am currently doing a supervised classification (just two classes for detection of large-scale solar plants) in GEE. When I am using training polygons drew and create as polygons everything works ...
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2answers
167 views

Classification model using NDVI time series?

I am trying to form a classification model with the help of NDVI time series data. I want to use methods like SVM and Random Forest. I know how to apply these methods to normal data. But, I am ...
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28 views

GPS file categorizer

Do you know a software tool that can categorize/group GPS track files based on the location of its points? I need a tool (standalone executable, script or QGIS extension) which I can feed a list of ...
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379 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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16 views

Is there a way to reuse the samples chosen for NN classification for an another image?

I recently carried out the classification of a UAV multi-band orthoimage using NN method in eCognition. I have another orthoimage from the same mission for a neighbouring area. I would like to apply ...
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45 views

Classifying Attribute Table values? [duplicate]

I have an attribute table with a lot of lines. I want to classify them considering their length: SHORT (from 0 to 50) MEDIUM (from 50 to 150) LONG (from 150 to 180) How can I do avoiding to modify ...
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2answers
1k views

Changing line width by classification in QGIS

I am using QGIS 2.18.18 I have a map of rivers and I want to style them based on their width. I have width as an attribute of the rivers layer. Just as we can style colors by category or graduated ...
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0answers
35 views

Can I symbolize based on the syntax in a description attribute colum?

I got a kmz-file from an organization and the attribute table has a colum 'description' with a synthax that holds import information (such as date built, water source, village etc.) instead of a ...
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1answer
29 views

Merging NDVI classified and unsupervised classified image?

I have clipped forest area from an image and apply NDVI classification on forest area and in the remaining, I have done unsupervised classification. So, I want to know after NDVI and unsupervised ...
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0answers
56 views

Linear Regression on single image with multiple bands in Google Earth Engine

I have a single image with 3 bands representing different properties for water detection and a 4th band for reference (ground truth - water/no-water). I want to perform a linear regression using the 3 ...
4
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1answer
162 views

Setting GroundFilter parameters for low density point clouds?

I'd like to use the function GroundFilter on my dataset. However, the manual says that the default values of the parameters used by this function (g parameter, w parameter) are related to a high ...
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1answer
78 views

Can my “.las” data be classified [duplicate]

I was given a ".las" data set from a Trimble/AutoCAD shop. I use Esri. I could not import the .las file they supplied to an ESRI LASDataset as it was created with Trimble software. I downloaded and ...
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1answer
100 views

Get round numbers using Natural Breaks (Jenks) classification

In ArcMap, is there an easier way to get more round numbers when using the Natural Breaks (Jenks) classification in the symbology tab? For example, in the image ebelow I'd want the classes to be 5-140,...
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2answers
49 views

How can I find the percentage of representation of classes?

I have done a classification using the semi-automatic classification plugin, and now, I would like to express each class in percentage of the study area (e.g. forest represent 20% of the study area ...
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3answers
772 views

Determining if polygon lies completly in another polygon or only partly using QGIS? [closed]

I primarily use QGIS. I have two Layers which both contain polygons.So one layer(A) contains only one polygon, the other contains a number of polygons(layer (B)). I can run the Intersect-Tool and ...
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0answers
524 views

Running OTB Random Forest Classification

I am having trouble processing a satellite image using the RF (Random Forest) classification, that is a machine learning algorithm in the Orfeo Toolbox of QGis 2.18.1. When I run the Tool, the ...
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1answer
165 views

Earth engine error: Layer 1: Layer error: Image.visualize: Parameter 'image' is required

For land use classification of my shapefile, When I use Landsat 4 collection, got an error: Layer 1: Layer error: Image.visualize: Parameter 'image' is required. but in the case of Landsat 8, ...
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1answer
107 views

Can I use a greenest pixel or a no clouds Sentinel 2 for NDVI analysis?

Can I use a greenest pixel or a no clouds Sentinel 2 for NDVI analysis? I want to use it for extract spectral signature. And now that I´m asking about it, I want to know if I can work classification ...
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2answers
43 views

Calculation area of different colored region using image classification

I have a georeferenced JPEG image(as shown below) I want to calculate the area of regions covered by red color and regions covered by blue color. I tried maximum likelihood classification using ...
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0answers
45 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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1answer
169 views

QGIS Gratuated Symbology gives differents results on every classification with Natural Breaks (Jenks)

When styling a polygon layer using the Graduated styling and the Natural Breaks (Jenks) mode, QGIS is classifying the data with different values. So every time I click on "Classify" the values are ...
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1answer
54 views

Classifying fields and getting statistics in ArcMap? [duplicate]

I am using ArcMap 10.6. I have a table with country data. I am interested in Asia only, so I created a new layer (and shapefile). Several countries have missing data, which was filled with the same ...
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1answer
79 views

Exporting vector from raster classification gives deformed vector in Google Earth Engine?

I am very new with Google Earth Engine and I try to make a landcover classification using Sentinel-2 imagery to get the urban area over a very large area (country wide ideally). I was able to ...
2
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1answer
39 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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1answer
8 views

No visable Difference between two Lists for Visualisation via Palette creating an Error

I want to Visualize a Landcover Classification I have different success with seemingly identical Lists. List 1: Pallette Parameters inside the Code like: var landcoverPalette1 = [ 'E6004D', //...
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3answers
4k views

Distinction between pixel-based and object based classification?

I am struggling to clearly understand the distinction between pixel-based and object-based classification in the remote sensing domain and am hoping someone from this community can provide insight. ...
3
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2answers
438 views

Classify a slope raster in Image Analysis

I have a DEM in a Mosaic Dataset covering a large area (300 x 200 km). I want to create a classified slope raster showing slopes of say 0 - 10 degrees, 10 - 20 degrees, and then 20 - 90 degrees. ...
2
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1answer
101 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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1answer
122 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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1answer
92 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 ...
2
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1answer
331 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 ...
4
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1answer
188 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
416 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
78 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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1answer
3k views

Computing unsupervised random forest classification in R?

I want to compute an unsupervised random forest classification out of a raster stack in R. The raster stack represents the same extent in different spectral bands and as a result I want to obtain an ...
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2answers
101 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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0answers
100 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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1answer
89 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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2answers
403 views

Creating raster from several polygon layers using ArcGIS Desktop?

I have the following map: The four layers have the following attribute tables: SF_UrbanTreeCanopy_84 SF_Building_Footprints_84 GrassBeach Water I want to create a ...
5
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1answer
232 views

black and white aerial ortophoto classification using texture with GRASS

I have a b&w image i want to classify; the trouble is that mere spectral classification yields a lot of error, I saw this in wikigrass In case of panchromatic maps or limited amount of channels,...
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1answer
221 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 ...
2
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1answer
78 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 ...