Questions tagged [land-classification]

A cartographic delineation of distinct land areas, identified by their geology, topography, soils, vegetation, climate conditions, living species, habitats, water resources, as well as anthropic factors.

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Making land cover classification predictions of Landsat 8 imagery using pre-trained CNN model [closed]

I am not very experienced in the field of image processing/deep learning/remote sensing. I have trained a model - perhaps incorrectly, to classify water bodies and land cover. Very simple. But I say "...
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9 views

Working/Functioning of “sampleRegions” function in Google Earth Engine

I am doing land use classification in Google Earth Engine. I am using three different classes(forest, building, water) for classification. For each class, there is a shapefile containing polygon ...
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1answer
544 views

Classification of buildings using USGS Landsat 8 images on Google Earth Engine

I am trying to classify built-up and non-built-up areas in the district of Ambala in India within the time period 2014-17 using a simple classifier model I had created. The model uses 20,000 points ...
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1answer
71 views

How to visualize data for a specific class in change detection plot in R?

I have created a change detection plot shown in image below for two rasters having 6 classes each using the code below. Now the plot, shows the change for all the classes but i am interested in only ...
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2answers
136 views

Converting output of crosstab() in R to raster; from classified raster images to show overall land cover change in different classes?

I have two classified landsat images from 2014 and 2018 both of them containing 6 classes including urban,forest,barren etc. In order to see how each pixel's class changed or remained same from ...
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841 views

Decision tree classifying of satellite image in R?

I want to classify satellite image in R using RWeka classifier, J48. I have a CSV file with the classes required, and raster data loaded in R. I am able to make the tree, however, I am not able to use ...
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2answers
44 views

How to define new classes from a change detection raster layer [closed]

As part of my thesis, I'm looking at the atmospheric and landscape effects of the 2018 wildfire in the Algarve. As part of the process, I want to estimate total biomass loss so I have classified two ...
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1answer
34 views

Do I need to perform any corrections on Level-2 Landsat imagery?

My objective is to perform a land cover classification with multiple scenes over historical imagery (one year every decade). Most of the imagery I have downloaded is level-2 imagery. From my ...
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1answer
59 views

Classifying coordinates on land/on water using QGIS?

I am a new user of QGIS. I'm looking for a solution for my problem. I have my own dataset providing the latitude and longitude of different unique ID's. Now, I would like to classify those ID's that ...
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1answer
70 views

Calculate area of overlap within polygons

ArcGIS Pro 10.6 I have a polygon layer with a column of 5 unique values, class names. I have a second polygon layer with a column of unique values, Parcel number. Each parcel will have multiple ...
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3answers
14k views

How to perform Random Forest land cover classification?

This is a follow-up to a previous post: Machine Learning Algorithms for Land Cover Classification. It seems that the Random Forest (RF) classification method is gaining much momentum in the remote ...
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Performing supervised classification with Landsat 7 in Google Earth Engine

I am trying to perform landcover classification of Shanghai using JavaScript in Google Earth Engine. I am a complete beginner at this and I have been going through many tutorials trying to figure ...
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Conducting Land Cover Signature Classification on Google Earth Engine?

I was wondering if there is a way to conduct Land Cover Signature Classification, as specified on page 122 of the following user manual: https://buildmedia.readthedocs.org/media/pdf/...
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2answers
166 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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25 views

Correct translation of Norwegian landcover classes derived from WMS?

I am making a map of the study site located in Norway. I have accessed the awesome and free WMS data regarding landcover (I guess: N250 Arealdekkeflate) https://openwms.statkart.no/skwms1/wms.topo4....
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Quantifying level of urbanization of catchment over time?

I am studying the impact of urbanization on the discharge levels of a river during flooding events. For this, I need to determine the catchment's percent urbanized area through land classification ...
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1answer
89 views

Array in python just full of zeros when opened using GDAL

I'm working on the below script. What I'm trying to do is create a stats.txt file output which has the Land Cover Class ID, Fractional Coverage (of that class) and the number of pixels (of that class) ...
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1answer
557 views

Classifying raster that takes neighbours into account?

I am working on classifying forest types using Sentinel-2 satellite imagery (10-m resolution; band-2, band-3, band-4 & band-8). I have ground-truthed field data as a training set. I want to set a ...
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1answer
2k views

Does the “Quick-TRANSfer stage steps exceeded maximum” warning message affect my unsupervised classification results?

A similar version of this question has already been asked here, but there was no satisfying answer yet. I get the following warning for some of my satellite images: Quick-TRANSfer stage steps ...
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1answer
2k views

Accuracy assessment using Google Earth Engine?

I'm using Google Earth Engine for Land Cover change detection, I would like to know whether we can generate Error Matrix (Accuracy Assessment) for a classified image in Earth Engine or not?
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Non-visibility of .ECD file in ArcMap using Random Trees Classifier

I have been using the Random Trees (RT) algorithm in ArcMap 10.6 for classifying some Landsat raster imagery. I have the training data file which I input into the Train RT Classifier to produce the ....
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0answers
125 views

Supervised classification with only one class with Google Earth Engine

I am a beginner with geospatial analysis and Google Earth Engine. I am trying to classify only one class of Landsat 5 image (swimming pool). I got several training sites and applied the classifier. As ...
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1answer
338 views

How to crop TIFF image without losing classes in QGIS 3.2?

I am trying to crop a TIFF file in QGIS 3.2. What I am currently doing is going to Raster -> Extraction -> Clip Raster by Extent... . Then I type in my min and max x,y values. The new raster layer is ...
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7answers
8k views

Failed to create signature file

I've no clue how to solve this issue in the exercise that I'm trying to perform. The point where I'm stuck is 4. "Create signature file as LandsatCompS.sgs". I've done what it says in the exercise. I ...
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2answers
321 views

Ice type differentiation using satellite data

I would like to classify glacial area by categories of snow (if there is) and ice, but what's most important: between old ice and fresh ice. They have different properties that are possible to ...
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1answer
50 views

Know of any existing quality training/validation datasets for land cover?

Looking to do some moderate res. global land cover mapping and need as much training and validation data as possible--does anyone know of any good/quality land cover/land use data that are freely ...
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7answers
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Machine Learning Algorithms for Land Cover Classification

I am interested in learning what software exists for land classification using machine learning algorithms (e.g. k-NN, Random Forest, decision trees, etc.) I am aware of the randomForest package in R ...
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1answer
85 views

Simple land classification (urban, suburban, rural) using polygons in MapInfo?

I have a large number of polygons which I need to classify as either rural, suburban or urban. These polygons represent wireless coverage for a cellular network. What I would like to achieve is a ...
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33 views

NoData values in classification accuracy assessment

I want to assess the accuracy of a settlement classification I made (classification map) by comparing it to another product's settlement classification (reference map). Both maps have two "normal" ...
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0answers
853 views

Supervised classification Google Earth Engine

In the next code there are: Creation of variables such as: Slope, DEM, NDVI magnitude, NDVI average, etc. All those variables merged with two LANDSAT scenes Unsupervised classification with all the ...
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182 views

Export a ESRI base map image as a raster for posterior soil and vegetation classification using ArcGIS 10.5.1

I need to export a ESRI basemap (or anyone with high resolution) image as a raster to perform a posterior classification. I need to differentiate trees from ground soil to obtain the proportion and ...
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1answer
202 views

Quality of median image

I am trying to do supervised land use classification in a certain region. As this region is naturally prone to clouds, I have filtered the image collection on images with less than 10% cloud cover and ...
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2answers
1k views

SCP V.4.9.6 - after creating ROI, Warning: The following signature will be excluded if using Maximum Likelihood

I am creating ROI in Clouds using "create a ROI" (polygon) and this warning often shows after i save the ROI. Since the warning says that it will affect the Maximum Likelihood, that is why i delete ...
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1answer
71 views

Supervised Classification using Remote Sensing data?

Is there a correlation between the time that supervised classification takes to execute and the training areas that we choose? Perhaps if we take larger areas for classification will the ...
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0answers
80 views

How to classify land cover with MMU 25hac

By using the 30 meter resolution of landsat TM & ETM+ data, I want to create the land use/ land cover map. I have read in several studies to first decide about the minimum mapping unit (MMU) that ...
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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
355 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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1answer
1k views

Accuracy assessment in R - Calculation of User Accuracy

I want to assess the accuracy of the land cover classes classified by supervised classification of Landsat images. As reference data I use the aerial photography. I sampled the classified Landsat ...
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0answers
50 views

Missing Values in Crop identification using Python? [closed]

I am developing a Python based process that classify crops via time series analysis. Due to clouds there are many missing values. My problem is how to assign a value to these pixels that would be near ...
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1answer
3k views

Is machine learning used much in GIS?

I'm new to GIS. Is machine learning used much in this field, and where? I'm investigating a job opportunity with a mapping company working on traffic awareness. My background is in supervised machine ...
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1answer
163 views

Using Hybrid Classification? [closed]

I'm new to this field of study. my teacher ask me to do a hybrid MLC and ISODATA classification for my bachelor thesis. so I got one journal that combine both method, but I think it too complex for ...
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0answers
91 views

Method in QGIS to classify veg from HiRes geotiffs created in Pix4D?

I have 10 2D geoTIFF orthophotos (~2GB each, ~3km2 each, all 4.2cm/pixel) that I generated from Vis RGB 12MP images in Pix4D for a desert vegetation survey over 30km2 for a development. I need to ...
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1answer
445 views

What are the necessary correction/calibration on Landsat 8 imagery for land cover classification? [duplicate]

I downloaded calibrated/corrected Landsat 8 data (Level 2) from ESPA (https://espa.cr.usgs.gov/) to do land cover classification. But there are many corrections and calibrations can be done as listed ...
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1answer
2k views

Processing LANDSAT 8 data in R (using packages Raster, RSToolbox, etc.) in order to calculate NDVI and land cover classification? [closed]

I am analyzing several LANDSAT scenes from the LANDSAT 8 OLI mission (18 in total, all from Jan 2017 - cloud cover < 20%). I now want to calculate the NDVI and do some land cover classification on ...
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2answers
1k views

Simplifying land cover classification in QGIS?

I have recently completed a land use classification using over 100 ROIs for 5 different land cover classes and it has developed what looks like a highly specific spectral signature for each class. ...
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1answer
464 views

Adjust polygons by edition (freehand and reshape tools used together)

I would like to adjust the polygons of my vector file. This vector is a land use classification with classes of vegetation, human uses, etc. So the form of the features classes are so irregular and ...
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0answers
211 views

SCP training input error message in semi-automatic classification

I have been doing some land classifications and everything was working fine, until it wasn't. I keep getting the same error message when I try to calculate the signatures from the ROI creation: [...
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1answer
26 views

Classification algorithm for landsat classification with training sites biased towards only few tiles

I would like to classify several LANDSAT tiles (18 of them), but only have training sites for 3 of the tiles. Should I merge/mosaïc all the tiles before running a supervised classification in this ...
2
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1answer
126 views

Surface reflectance product - do I always need it?

There is a neat Surface Reflectance product of Landsat imagery. I know the difference between SR and raw products: SR presents calculated values, that are supposed to represent state of the Earth ...
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2answers
577 views

Feature extraction in remote sensing? [closed]

Which are the most common features in order to perform a supervised classification in remote sensing? Furthermore anyone worked with SAR features? Which are the most commonly used? Can anybody ...