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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How to use a shapefile to Object based classification on eCognition?

Let me ask you a question about object-based classification with eCognitoin's Developer license. With the esstentials license, after the segmentation, a shape file to be used as teacher data was read ...
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Densify and smooth out categorical raster with diagonal neighbors

I'm classifying vegetation types in QGIS (3.10). I have a pretty coarse raster that I want to smooth out. The standard approach seems to be to polygonize and then apply various smoothing algorithms (e....
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Get polygons of crop classification from the Land Parcel Information Systems (LPIS)

I'm trying to get\download polygons of fields with crop type. There is a USA database called cropscape which is very friendly. There is also a European one called Land Parcel Information\...
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1answer
50 views

Splitting up a region into training data and validation data for Landsat7 classification

I am building a classifier for Landsat7 by using MODIS land cover classification. My goal is to split up my region of interest into 80% being training data and 20% being validation data (with a ...
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304 views

Replace specific raster class by surrounding classes

I have a classified landcover raster which also contains the classes "clouds" (pixelvalue 5) and "shadows" (pixelvalue 10). I want to eliminate them by replacing these two classes by the majority of ...
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Measuring area of raster within polygons using QGIS

I am trying to use QGIS3.10 to analyze the area of forest within regions. It looks like this where the polygons belongs to WFS layer and Rasters belongs to WMS layer. The legends fo Raster suggests ...
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18 views

Creating boundaries for Land-use classification

I have done the land use classification for sentinel imagery. Now I want to create boundaries, within that classified image, enclosing different classified section. For example boundaries for water, ...
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1answer
35 views

Classifying type of crop on satellite images using Python [closed]

I'm trying to make a classification on the send with python, but logically I find all the vegetation that I don't care about. The even more serious fact is that if the species is not present in a ...
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1answer
35 views

Classifying land use in polygons using aerial imagery

I am trying to use the shapefile here: https://environment.data.gov.uk/DefraDataDownload/?mapService=EA/HistoricLandfill&Mode=spatial to work out how much of the sites are covered in trees. I ...
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21 views

Export classifier from SCP Plugin for use in other image classification

I have run a classification using the SCP plugin in QGIS. I want to recreate these results in a neighboring area and I am looking for help to see if it is possible to save the classification ...
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1answer
34 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
113 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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187 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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59 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
45 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
86 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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1answer
94 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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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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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
107 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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143 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
404 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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1answer
657 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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52 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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34 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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1k 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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1answer
225 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
181 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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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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1answer
87 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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52 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
213 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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93 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
480 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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244 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
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
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 ...
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1answer
134 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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1answer
590 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
67 views

What is no change class in NLCD 2011?

I have to use the NLCD 2011 dataset and I am trying to understand the "no change" class. This class is not defined in any of the legend descriptions (Anderson classification). What is the no change ...
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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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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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218 views

Setting CRS automatically on Raster using QGIS? [duplicate]

I'm currently working with the Semi-Automatic Classification Plugin to help ID agricultural plots. However, when I attempt to set up the training I am given the error message. Error [61]: ...
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1answer
328 views

How to convert NoData values to other values for raster data?

I have a NDVI map from MODIS data for my AOI. When classified, i noticed that few of the pixels appear in " white" color and show no value. How do i classify these pixels and attache an appropriate / ...
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72 views

Endmember selection when applying SAM, SVM and MLC to PCA

I intend to apply the Spectral Angle Mapper (SAM), Maximum Likelihood (MLC) and Support Vector Machine (SVM) algorithms on a hyperspectral dataset in ENVI but I am slightly confused as to how to ...
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123 views

Making land-use raster reclassification in QGIS? [duplicate]

I have been struggling with the task of creating a least-cost path between two points on a land-use map. So far I have got the raster as follows (category names don't matter right now) So these 7 ...
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1answer
130 views

Differentiating between Water and Built-Up pixels in ArcGIS Desktop?

I am classifying an imagery that has 3 bands i.e., NIR, Red, and Green band. While classifying I am not able to differentiate between Water and Built-up pixels and there is lot cross contamination ...
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QGIS: use graph builder to classify multiple images at once

I am classifying subsets (Sentinel 1, Sentinel 2, NDVI, and Landsat 8 data) in order to see which image as the highest accruacy. These classifications are taking several days for each of the images. ...