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
362 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
110 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
270 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
336 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
63 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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477 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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86 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
143 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
181 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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90 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
257 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
96 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
147 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
127 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 ...
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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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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
161 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
68 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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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
167 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
57 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 ...
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2answers
379 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 ...
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1answer
199 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
57 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 ...
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1answer
645 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 ...
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1answer
184 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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52 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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114 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
931 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
69 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
114 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 ...
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0answers
608 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 ...
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72 views

Photogrammetric point cloud classification

My question is regarding the point cloud classification and editing work for a photogrammetric point cloud generated using drone based imagery. My objective is the generation of a digital elevation ...
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0answers
129 views

Using Maximum Likelihood Classification and raster border in ArcGIS Desktop?

I have tried multiple times to see if this was an issue with my supervised classification, but I don't think it is. I created my training samples and created a signature file. Per my course, I need to ...
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1answer
101 views

Classify area by year

I'm trying to classify a set of buildings (grey) in a layer, according to construction year, in a number of different areas (orange). In Orange – areas with a sum of buildings inside. The ...
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1answer
204 views

GEE: apply ee.Reducer.mean to a list

After classification of an image in GEE, I got 2 lists of user's and producer's accuracies (1*7 and 7*1 dimensions). How can I calculate an average value for each of them now? print('Validation ...
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3answers
3k views

Pixel-based and object-based classification!

I would like to understand if pixel-based classification algorithm (e.g. Maximum Likelihood classification ) can be used for object-based classification (i.e. after a segmentation procedure). On the ...
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1answer
304 views

QGIS 2.18.19 and OTB 6.4.0 Application

I've tried the whole weekend to get the Orfeo Tool Box running in QGIS 2.18.19 (stand-alone version) and today I finally managed it by setting the paths to the bin-folder of the stand-alone version on ...
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1answer
349 views

SAGA 2.2.5 Problem Object Based Image Segmentation

Every time I use the Object Based Image Segmentation with Landsat 8 data I get a segmentated image which looks like a spider's web. The image contains no 0 values. Anyone has a idea how to fix this?
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35 views

How to Make automatic classes with algorithm in qgis modeler?

I have 1 column of numeric data in one attribute table of a layer made of points. I want to regroup this data in classes (style) with the Qgis modeler and each class must have a specific lenght that ...
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1answer
353 views

Taking classification image from ENVI and using it in ArcMap?

Loading ENVI file into ArcGIS Desktop? is a question similar to this but used a slightly different way of going about things so it made it not fit my situation so here's my situation. I ran an ...
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1answer
1k views

ISOdata classifier in QGIS?

Is there a function that produces an ISODATA unsupervised classification in QGIS? The only unsupervised classification function I can find is a KMeans.
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59 views

How to assess significant land cover changes using Chi-square test?

I have a series of land use maps at different times as a result of a classification process on Landsat images. I am mapping 3 different thematic classes : bare soils, vegetation and croplands. I ...
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0answers
545 views

Remote sensing Classification and texture analysis compared with QGIS zonal statistics

I am Using Geomatica to analyse suburban spectral signature in Las Vegas. Ran a texture analysis on all band images. Combined texture bands with original image bands to run an unsupervised ISODATA ...
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3answers
192 views

Landsat 8 striping/banding citation

Does anyone have or know a citation for the Landsat 8 striping that affects some scenes (Brazil shown here). It's apparent in all bands (B3 here at 100% stretch) and is present in both RAW and ...
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1answer
252 views

Creating new field with values from different fields QGIS [duplicate]

I have combined different layers (vector) in a merged layer. All layers had one specific land-use type, so now the new layer has fields called 'tree', 'paved', 'building', 'water' and 'plants'. All ...
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1answer
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Question about storage space (multispectral imagery vs. classified GIS rasters) [closed]

I have a quick question about storage space in ArcGIS. When I have limited storage space, I am trying to figure out which one on average takes up more space: multispectral images or classified GIS ...