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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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Adjusting PixelValues by function - Google Earth Engine [on hold]

I am not finished with my task so far, but I am stuck so maybe you can help me out at this points (and maybe later as well). Here is my code: var AOI_cut = ee.Geometry.Polygon([[ [20.56356780529154, ...
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11 views

Input of KMeans when using multiple Band-Image in Google Earth Engine?

I am using Earth Engines ee.Clusterer.wekaKMean() for Clustering my Data. My input is a mosaic of different S1 images containing VV and VH bands. Is it possible to declare which bands are taken ...
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20 views

Access output of KMeans-Clustering in GEE [on hold]

I am quite new to Earth Engine overall, but managed to perform a KMeans-Analysis on my area of interest. Unfortunately I am not able to extract the values for the means of the different clusters. Is ...
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18 views

How to create coordinate system (using Lat/Long) across IR & VIS satellite images

A recent project of mine has been to gather IR and VIS data from WeatherUnderground's online site for the purposes of creating fun and informational temporal GIFs. Now, I'd like to take it a step ...
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14 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
34 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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0answers
15 views

Slope classification in ArcMap [duplicate]

I'm trying to measure the area in hectare of a slope degree using generated slope raster from DSM file. Is there an easy way for me to do it in ArcMap?
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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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25 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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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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30 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
29 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
51 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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1answer
27 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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25 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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0answers
57 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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8 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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1answer
34 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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44 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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21 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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0answers
24 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 ...
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1answer
55 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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29 views

Labeled training data for water extraction/classification

I'm working on a small project to extract water features from satellite images. In particular, I plan to use Landsat 7 ETM+ satellite images of a particular lake (it's on plain land). I have decided ...
3
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1answer
79 views

A reproducible example for the use of separability measures in improving selection of spectral variables

I have been working with the tutorials in GEE on supervised and unsupervised classification, but I haven't come across any examples on the use of separability measures such as Jeffreys-Matusita, ...
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1answer
59 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
53 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
38 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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1answer
26 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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1answer
42 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
60 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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0answers
29 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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2answers
38 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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1answer
135 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
40 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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2answers
68 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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0answers
290 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
36 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 ...
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1answer
7 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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1answer
42 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
32 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
62 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
46 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
50 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
202 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
82 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
46 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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0answers
30 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
59 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
105 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 ...
4
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0answers
96 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 ...