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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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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 ...
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1answer
313 views

Slope Classification for HRU in a watershed (SWAT Model)

For the definition of HRU (Hydrological response units), the parameter slope can be classified into maximum of 5 classes. Depending on the definition the results will vary. Is there a commonly used ...
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0answers
342 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
2k views

supervised classification

I am having a problem in creating new signatures in Signature Editor in ERDAS 2014. Whenever I click on the icon (i.e., after selecting the aoi), it shows an error which says "unable to open ...
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1answer
107 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
84 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
35 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: ...
7
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1answer
151 views

How can I get a numerical (or value) display for equal intervals in a layer?

I'm looking to classify regions on a map by the amount of light pollution in the area. I have the varied intensities (0 through 60) plotted using a color map, but is there anyway that instead of a ...
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1answer
68 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 ...
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2answers
1k views

Creating histogram/statistics/scatterplot by classification tool in ArcMap?

I'm currently working on a land cover classification with Landsat 8 imagery. I already subjected the imagery to pre-processing (atmospheric and topographic correction) and I mosaiced two images. Now I ...
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1answer
202 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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1answer
124 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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1answer
153 views

Classify LAS By Height tool is not yielding any results?

The classify LAS by height tool (CLHT) in ArcGIS says that it will only reclassify LAS points with class codes of 0 or 1 (http://pro.arcgis.com/en/pro-app/tool-reference/3d-analyst/classify-las-by-...
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0answers
103 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
447 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
118 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
309 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
43 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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2answers
391 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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1answer
66 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
30 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 ...
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0answers
517 views

Assessing accuracy of image classification using ArcGIS Desktop? [closed]

I have classified images in ArcGIS Desktop with the support vector machine classifier, and am now struggling with the accuracy assessment. I have only been able to find tutorials on how to do it ...
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0answers
87 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 ...
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3answers
173 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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1answer
210 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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0answers
96 views

Reclassifying based on neighbour polygons using QGIS?

I have a polygon shapefile and each one has one class attached. I want to reclassify one of them based in the neighbours. For example, I have a polygon with class street and I want to reclassify to a ...
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2answers
276 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 ...
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2answers
102 views

Post process OBIS for Canopy Dedection

I have high resolution UAV-Images (4x4cm) in RGB and would like to detect individual tree canopy's. I was using Object Based Image Segmentation (OBIS) from SAGA to classify the images by homogeneous ...
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1answer
151 views

Seeking 4-band satellite imagery?

I'm looking for good quality, fine resolution 4-band satellite photos of Sweden for academic use (and I'm willing to pay for it). What I'm after is as detailed as possible photos of certain part of ...
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0answers
139 views

Classify / section line or group of points according to shape (with shapely objects)

Is there any python module/function that classifies/sections a shapely line according to the shape the line forms? If not, I could do it with the positions of the points that form the line. I would ...
3
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1answer
1k views

Classifying LiDAR ground points using laspy?

I have a classified LiDAR point cloud (.las) with misclassifications. The walls of steep surfaces that should be ground (class 2) have been misclassified as vegetation (classes 3, 4, 5). I am ...
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0answers
25 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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1answer
164 views

single feature probability in ERDAS object-oriented classification

I'm using ERDAS for my UAV image classification (consists 6 land cover types) and I performed the first step of Object-oriented classification, Single Feature Probability (SFP). It outputted a ...
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1answer
70 views

Problem with supervised classification (using GRASS) [duplicate]

So I was playing with supervised classification with GRASS. The first issue that I ran into was right after the first two steps of classification (v.to.rast and i.gensig) which was: unable to read ...
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0answers
2k views

NumPy ValueError: operands could not be broadcast together with shapes (1,2) > (1678,2218)

My objective is to classify a Landsat 8 image using supervised classification. I have a training point shapefile data and a preprocessed Imagery. I want to use Random Forest classification method. ...
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2answers
173 views

Orfeo Toolbox KMeans Classification failure

I am trying to process a Landsat8 OLI image using the Orfeo Toolbox Unsupervised KMeans Classification application. I obtain the following error message: Error when loading model ...
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0answers
59 views

Identifying clusters in classified imagery data

I am relatively new to working with satellite imagery at 1 m resolution and am struggling with a methodology for "grouping" the imagery. Using ArcGIS, I have performed an ISO classification on some ...
2
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2answers
380 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 ...
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1answer
43 views

Classifying GPS locations according to Land area classification using ArcPy?

I have a vector layer for the GPS locations and a raster for the landuse/landcover. I've realized a supervised classification to classify the categories in the Lulc and a maximum likelihood ...
3
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1answer
217 views

How to tell if a geo-point is on a road

I am looking for a robust way to determine if a geo point (long, lat) is located on a road I am currently using openstreetmap overpass-api with the following query: way[highway](around:3.0, {lat}, {...
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0answers
58 views

Using result raster of Semi-automatic classification to obtain spatial statistics?

I finished classification (use SACP in QGIS), and got a classificated raster. Now I want to obtain characteristics such as sum area of class, areas of different polygons separately, etc. I tried use ...
2
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1answer
726 views

Classifier with SVM algorithm for sentinel 1A image

I am classifying rice for the Red River Delta with 2 class: class 0: Rice class 1: Not rice I used svm classifier algorithm. However, after running the code, the classifier operated for a long time ...
2
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1answer
201 views

Duplicate Layers in eCognition

I am attempting to use eCognition Developer to segment and classify 5-band UAS imagery. When I go to create a new project in eCog and input my imagery (individually selecting the five .tif files), it ...
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0answers
55 views

Training Sample Automation

Background, in case it helps: My objective is to (eventually) fully automate the mass digitization of grain silos. To this end, I have set out to first find a way to automatically identify silos in a ...
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0answers
119 views

Performing Object Based Image Analysis with NAIP?

I use NAIP imagery (primarily in QGIS/GRASS) for agricultural analysis. I want to separate out objects such as grain silos, farms, buildings, &c. using segmentation and classification. Is this ...
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3answers
941 views

Identifying training sites?

Prior to image classification, collection of training sites and obtaining a signature file is the most critical step. Field visits with a reliable GPS Unit is usually the first step followed by ...
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1answer
75 views

How do I export training samples from IDRISI?

I have been tying to implement this paper on an SVM classifier wherein I need to extract training samples from an image and run an SVM classifier on it. The paper says the following: IDRISI Andes ...
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0answers
124 views

QGIS: Cropland Data Layer - how to add class names to .tif file?

I'm working with a clip of the Cropland Data Layer (raster), which has a number for each value coded to a crop type. I want to add these crop type / class names to the .tif file (and have them show up ...
3
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0answers
657 views

Image Segmentation and Object-based Classification in Google Earth Engine [closed]

I have tested three methods to segment my image collection: (https://code.earthengine.google.com/699f04706c114260068275acd2605644) var l8sr = ee.ImageCollection('LANDSAT/LC08/C01/T1_SR'); function ...