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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55 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
108 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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2answers
39 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
32 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
54 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
51 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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37 views

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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48 views

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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15 views

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
73 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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25 views

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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106 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
293 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
470 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
47 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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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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741 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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137 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
191 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
158 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
83 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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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
156 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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89 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
411 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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191 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
1k 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 ...
2
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1answer
120 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
529 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
63 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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0answers
183 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
229 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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0answers
63 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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109 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
126 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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0answers
45 views

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. ...
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1answer
115 views

Why do some tools / scripts not open for use in the ArcGIS?

I am using the Image Classification toolbar to classify a composite LANDSAT image and every time I go to the "classification" drop down and chose the "Iso Cluster Unsupervised Classification" option ...
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0answers
180 views

Image classification: separating pine forest, lowland and upland hardwood

I want to classify 20 feet-resolution 4-band leaf-off image into lowland hardwood, upland hardwood, pine trees, and other (bare ground, water, roads etc). I am thinking to use randomForest package in ...
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1answer
218 views

Low Recall for Radar Image Flood Classification

I am following the example here to learn how to classify flood images. I am using a single band of the Sentinel-1 radar imagery. I am able to build and train my model without trouble. The problem is ...
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0answers
39 views

Preprocess a thematic raster to produce multi-band raster of proportions?

I've been trying to figure out a way to pre-process a single-band thematic raster dataset (e.g., land cover) to produce a multi-band raster of proportional cover. For example, consider a land cover ...
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2answers
1k views

Extracting Metadata of a GeoTiff image

I am working on Landsat 8 satellite image and want to perform land cover classification for a particular region Preferred software tool is R I have formed a RGB image from the satellite data and now ...
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1answer
366 views

Export Google Earth Placemarks to shapefile

We were provided with a few geotagged photos, from those photos we were expected to mark more classification points around the region for the classes like water, built-up and barren land. I was able ...
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1answer
86 views

Can I use an existing landcover shapefile to classify a landsat image better than ROI approach?

I am trying to teach myself how to develop a land surface temperature map for the first time using landsat 8 images in QGIS. I have been following an online tutorial but it seems that, when I get to ...
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1answer
241 views

How to use qgis to get fraction of different vegetation types in a grid?

I have a vector file having different land use type. I have to create grid in that and the grid should be similar to a raster file. Finally I have to calculate fraction of each land cover type with a ...
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2answers
216 views

Applying Maximum Likelihood Classification to a single band (NDWI)

I have applied ML to a single band file, specifically a NDWI (McFeeters version). Comparing the results of this classification, with ML applied too a normal 5 band RapidEye Scene, the first one gave ...