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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Errors when uploading image to Earth Engine directly from the Cloud Storage bucket

I wanted to upload the image to Earth Engine directly from the Cloud Storage bucket with the earthengine command but encountering some errors !earthengine upload image --asset_id={OUTPUT_ASSET_ID} --...
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Generate classification schema in ArcGIS Pro using labeled raster - fail

Trying to do supervised classification of L1TP Landsat 8 OLI bands using USDA Crop Data Layer .tif file through ArcGIS Pro. The Crop Data Layer file has one band, with labels like "Corn", &...
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Categorise vector layer based multiple attribute variables

I would like to make a classification of a dataset (WFS point layer) on the values of two different variables. I would like to select from the first column only a specific type of flower (Rose). Then, ...
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fusion of different resolution satellite image?

I have two dataset Worldview (38cm: pansharpened) - R,G,B Planetscope (3m) - R,G,B,NIR But, worldview image has only R,G,B, so I can't figure out spectral response for classification. I think it's ...
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Change classification attribute of points in las file by laspy

I'm not able to modify my classification attribute for points that have met the treshold value of Z elevation values. The las file has point format 6 containing ['classification_byte'] and ['...
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Extract band values to points from mosaic (ArcGIS) in R

I am classifying satellite images in ArcGIS. I would like to partially evaluate my results in R, e.g. through Crossvalidation. I want with mosaic (raster with 6 bands) extract band values to points ...
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Resources for building convolutional neural networks for image classification? [closed]

I am beginning to look into using convolutional neural networks (CNNs) for image classification. For what I will be wanting to do, I will be building a large training database of images that will be ...
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Performing land cover classification over whole country

I am doing land cover classification over the whole country of Djibouti. I am downloading Sentinel 2 images for this purpose. I have realised doing land cover classification over a large area needs ...
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What are some ways to measure the width of desert roads in satellite images? [closed]

I'm interested to know what sort of software and/or concepts should I learn to be be able to get a computer to recognize desert roads in a satellite image. This satellite is an example of what sort of ...
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QGIS SCP doesn't stack all bands for Sentinel 2

I've been following various tutorials to try and stack and then eventually classify images from Sentinel 2, but after downloading the images and running the band set tool, it simply only stacks 4 ...
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Results of Variable Importance of RF Classifier in GEE

I create a RF modulu in GEE like this; //Random Forest Result Function Module exports.getRfResults = function(image, title, bands, trainPoint, testPoint, area, label) { //Create Sample Points ...
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Which function/method in GEE is similar to “supervised classification of shapes tool in SAGA GIS”?

For object based image analysis (OBIA), I have segmented my image. In next stage, I want to assign classes to segments (training data) followed by supervised classification of attributes data. In SAGA ...
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Fire Danger Forecast index- classification - USGS

I recently downloaded a raster image called Fire Danger Forecast index from USGS - Fire Danger Forecast, and I wanted to get the probability of fire for a set of points I have in another layer, but ...
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Unsupervised pixel classification in ArcGIS Pro 2.4.0: ISO cluster will not let me classify image into three classes

I am using ArcGIS Pro 2.4.0, and am attempting to classify a field into a schema with three categories: Leaves, Shadows, and Soil. Here is a sample of the original RGB image: Through supervised ...
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Google Earth Engine: Collecting Region Samples through image collection and merge them

I am using S1 Imagecollection to start a temporal supervised classification. Firstly, I added polarimetric indexes and other data as bands in each image. Then, I filtered the image collection and got ...
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Is there a Post-classification Majority Analysis feature on Google Earth Engine (Similar to ENVI) for Landsat 5 and Landsat 8 images?

In ENVI there's a Majority/Minority Analysis function that allows you to to change spurious/"wrongly classified" pixels within a large single class to that class (it also allows you to enter kernel ...
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Issue when running a land cover classification based on OBIA

I am carrying out a hybrid classification based on OBIA, following the magnificent code that Noel Gorelick and company developed: https://code.earthengine.google.com/?scriptPath=users%2Fnclinton%...
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Calculating number of plants on orthophoto

I have orthophoto map of agricultural field and I need to count plants there. I have also multispectral map (NDVI) but I think it's not very usable here. I know the best would be to have point layer ...
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50 views

Probability of variable importance calculation error in Google Earth Engine

I am trying to calculate the probability of variable importance each bands for classification. Basically, I have 3 class but when I try to implement the probability of variable importance, the error ...
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Pre-trained transfer learning models for satellite image classification

I am currently working on a project that tackles crop type classification using machine learning and deep learning. Given the limited amount of satellite data that I have, transfer learning sounds ...
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Extract house and road using image Google Earth

where I live does not have gis data, only images from google earth, so I want to take advantage of this image to build gis data,it is local's road, river and house. I am a beginner with this job. I ...
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78 views

No Data was found error after applying a MaxEnt classifier (GEE)

I am trying to redo this tutorial: https://developers.google.com/earth-engine/classification, using the MaxEnt classifier with my data. Code: https://code.earthengine.google.com/...
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Mask out pixels smaller than 1ha in Google Earth Engine

I am new here so please forgive any mistakes in this post: I have a simple script to classify cultivated area vs none cultivated areas using Sentinel-2 in GEE. I want to mask out all objects that are ...
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When to choose between a raster or vector format?

I'm trying to decide how to best serve data layers on a map. The data will be preprocessed on the server. The workflow I'm currently trying to implement goes as follows: Acquire satellite imagery (eg....
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43 views

Calculating areas of different raster classes in R with Superclass

I have a classified image with three categories (specific grass species: 1, ground: 2, other vegetation: 3). I am trying to calculate the area of each category. For the classification process I used ...
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Train/test split in QGIS

I have a polygon layer, which contains information about different classes and I am using it as training areas for supervised classification. Is there any way (like tool or plugin) in QGIS which could ...
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1answer
26 views

Calculating LULC change 1973-2014 of a classified map (raster converted to shapefile) in ArcGIS 10.6

I am attempting to workout landcover change between two classified landcover maps. Ideally I want to show percentage change between the years per landcover type. I think I have done this but I am ...
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61 views

GEE never count 100% of the pixels

I have few codes that count number of pixels in different classes in GEE, and then calc the precentage of them using the total number of pixels that were count. The code seems to work, but when I ...
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30 views

Extracting pixel values by overlaying polygons

I am trying to extract pixel values by overlaying polygons. I use a code after Patrick Grey (http://patrickgray.me/open-geo-tutorial/chapter_5_classification.html). When I masked the image with the ...
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52 views

Train Images Classifier - OTB Spatial reference of input and samples don't match

I am running the Train Images Classifier on OTB 7.1.0. I used QGIS to upload a raster images and then created a vector polygon file for my classes. I ensured that both the raster and vector files are ...
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Use Summary Statistics and Add Join to Categorize Blockgroups

I am relatively new to GIS and am still learning how to us ArcGIS Pro. I am trying to figure out how to use the "Summary Statistics" tool and the "Add Join" tool in order to categorize blockgroups in ...
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Find overlapping area of each class in classified images

I have three classified satellite images, lets say 2005, 2010, and 2015. All images are similar i.e. the same total area and same number of classes. I want to output those areas where pixels of all ...
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How to run multi level segmentation for LULC in process tree, eCognition software

Can we run the eCognition multi level (level 1 ,level 2,...) segmentation and classification in the same process tree? I want different outputs to show for each levels in a process tree. I'm in the ...
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Semi-Automatic Classification plugin: Cloud Masking errror

I'm doing Tutorial 2 out of the manual for this plugin as a GIS course lab exercise and I'm hitting an error when attempting to run the cloud masking function. I'm using 3 bandsets of Sentinel-2 data ...
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1answer
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Calculate the class limits from the kernel density depending on the percentage of the source dataset

My goal is to make the class boundary of a kernel density dependent on a percentage of the input points. Specifically I calculate the kernel density from 3000 points in a 50m x 50 m grid with a search ...
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1answer
52 views

Aggregate multiple image class values into a single class (Earth Engine)

I have created 20 clusters from unsupervised classification of a specific region in Google Earth Engine. Now I want to reclass them. For example, let's say class values 10, 4, and 16 are forest, I ...
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How to improve LiDAR classification in GlobalMapper

I have a LiDAR point cloud that has a density of 16.4 points per m^2 and spacing of 0.2469m, and am trying to extract trees from it but the classification came with a lot of messy points in classes ...
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Nan values when classifying with Natural Breaks (Jenks)

When using the Natural Breaks classification mode, "nan values" often appear in the classes (see picture below). The nan values may disappear when I change the number of classes back and forth, but ...
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72 views

Scripting color palette to align with corresponding classes from supervised classification in Google Earth Engine

When I display my classification map, the colors don't line up with the variable that I want them to. For example, my forest category is represented as red (instead of my goal color-green), or my ...
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1answer
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Verifying that it is ok to use multiple band combinations as I create polygons for my supervised classification?

I am sorry if this is a naive question, but I am very new to remote sensing analysis. I am conducting a supervised classification in Google Earth Engine. I want to verify that as I develop my ...
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1answer
16 views

Targeted Region of Interest Classification in eCognition

Is there a method of targeting only specific areas for classification in eCognition? Say, maybe using pixel coordinate constraints?
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Leaving Image Objects that are Uncertain to be a Particular Class as 'Unclassified' in eCognition

In classification of the imagery, is there a way of leaving certain image objects unclassified? Say for example, if the classifier is uncertain what class to classify the image object as, does ...
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Earth Engine: Simplest way to move from EE image to array for use in sklearn?

I've produced a very large multiband image in EE with the goal of classifying it using the classifiers implemented in sklearn (the native ones implemented in EE don't provide enough flexibility for my ...
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Handling Nodata values in sklearn (working w pyimpute)

I'm using sklearn for a classification project. Because I'm relatively new to doing geospatial tasks outside of a GUI, I'm using Matt Perry's pyimpute (link has all the code for that module) to handle ...
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118 views

Multi-temporal classification in Google Earth Engine - clustering and grouping based on time sero

I am working on my master thesis on multi temporal classification of LULC using S2 imagery in Google Earth Engine. The goal: to distinguish urban area from the landscape in the Inner Niger Delta. ...
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21 views

Printing label and associated pixel value from raster?

I have created a classified raster using the ArcGIS Pro image classification wizard. Unfortunately, I am unable to get the table of pixel intensities & associated labels to export to .csv. When ...
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QGIS SCP pulgin layer output

I use the plugin regularly and have already used every function. But I have often noticed that the output layers are not always intuitively understandable. I googled on the topic and found no ...
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112 views

Accuracy classification in Google Earth Engine

I'm trying to perform a supervised classification of a composite image from a Sentinel-2 time series. I'm using cart as classifier and a set of points as trainers. Once computed the classification I'm ...
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Calculating proportion of pixel containing vegetation (from sentinel 2 image stack)

My task is to perform a supervised classification of landcover across a huge (20,000+ hectare) property. I need to classify into three classes: forest, regenerating trees, and soil. We use s Sentinel-...
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Create categorized renderer from styles won't color categories

I'm trying to use the tool named 'Create categorized renderer from styles' When I classify my layer by an attribute table value in layer properties/symbology/categorized I get different colors ...

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