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.

learn more… | top users | synonyms

0
votes
0answers
12 views

Maximum Likelihood Classification in ENVI

can anyone help me? I am a new ENVI user and I am trying to perform a supervised classification of a Landsat 8 image with the maximum likelihood algorithm. In order to run the classification, I have ...
2
votes
1answer
24 views

How to define a threshold in Principal Component Image for Urban mapping?

I am working on an Urban mapping and i would like to know how i could define a threshold value for extracting built-up areas from a PC (Principal Component) Image ? I am interesting on how to ...
3
votes
2answers
45 views

How to give polygons a classificaton code in ArcGIS?

Does anyone have a trick for assigning polygons a code based on the classification classes? For example, if I symbolize the population of census blocks with 10 classes using Natural Breaks, I would ...
1
vote
0answers
21 views

Needed help to launch SVM classification in eCognition

I would like if somebody help me to launch SVM classification in eCognition. Have you met any tutorials? I was searching through ecognition community, but there I find only basic KNN supervised ...
5
votes
1answer
62 views

Aggregating polygons with space between them

Im currently editing a large dataset that has large chunks removed throughout (buffered road network). The areas adjacent from each side have coinciding attributes, but have this large erased area in ...
2
votes
2answers
47 views

Adding more than one legend in QGIS Print Composer?

I'm using QGIS 2.8.4 and I can't seem to figure out adding more than one legend to my Print Composer. Say I want a larger map and then an inset map -- showing perhaps a different classification/color ...
1
vote
0answers
18 views

Band Separation from regular cameras

I have removed the IR block filter from a Sony digital compact camera so it has become multispectral (in a way). In addition to that I placed a IR pass filter, so it only captures photos in the ...
0
votes
1answer
15 views

Rule of thumb for selecting ROIs for supervised classification

I'd like to perform a supervised classification using the Semi-Automatic Classification Plugin and a maximum likelihood classification algorithm. I read about a rule of thumb which says "if training ...
1
vote
0answers
25 views

Normalizing raster data: getting a range of output values as opposed to a Boolean output [duplicate]

I converted a polygon shapefile which defined ED boundaries to raster. The value i based the raster surface on was a population count for each ED. The values ranged from 568 and 18160, as expected, ...
0
votes
0answers
16 views

Adding Masked Classes to unsupervised classification in ERDAS Imagine

Prior to supervised classification of a landsat 8 scene in ERDAS Imagine I masked two classes using the 'Mask' tool [Raster - Geometry - Subset & Chip - Mask] I now wish to add these two classes ...
0
votes
1answer
19 views

Call Toolbox operators of ENVI from IDL code

Is it possible to call the clustering/classification algorithms included in the toolbox of ENVI (gui) from IDL (source code) and how?
0
votes
0answers
14 views

Finding spectral reflectance bands for classes created from unsupervised classification

I am working on a project that requires separating water and non-water features based on unsupervised classification in ERDAS Imagine 2015. I have taken the original image, and assigned it into 50 ...
1
vote
1answer
75 views

Creating building footprints from LAS files

I wish to create building footprints from the classification in our LAS files. I have filtered out the building points, using the point cloud filter. But I now trying to join the outermost points of ...
4
votes
1answer
170 views

Random Forest land cover classification in ArcMap?

I am an undergraduate student working with a very large data set (to me), and who has NO experience with R, but is fairly comfortable with ArcMap. I have about 60GB of 8band 1m satellite imagery of ...
1
vote
0answers
24 views

Using same ROI/Signature for classifying spatially different rasters?

Using QGIS SCP Plugin, I have classified a raster of a state. Can I use the same ROI/signatures to classify rasters of other states?
3
votes
0answers
52 views

ArcGIS quantile classification

I have been implementing a workflow previously devised ArcGIS 10.2 in R. The process involves a discretization of an integer raster (the cells are counts) through quantile reclassification. I've ...
2
votes
0answers
48 views

Create a raster dataset containing the number of returns from a las file? [duplicate]

I already created DEMs, DTMs, DSMs from a LiDAR (LAS) file with a little help from the internet. However, right now I'm kind of stuck in my research. I want to create a raster file which contains ...
0
votes
0answers
107 views

Object-based classification using R and Orfeo Toolbox

I am trying to run an object-based classification using R. The Landsat images were segmented using Monteverdi (Orfeo Toolbox) and training samples (segments) were selected. My problem is that the ...
0
votes
0answers
27 views

Finding Land Cover colormap (*.clr) for IGBP Land Cover Classification?

Where can i find a land cover classification colormap (*.clr) for IGBP land cover classes? How can i apply the legend colors on the land cover classes? I'm using ArcGIS.
0
votes
2answers
61 views

Area calculation of mapped categories in ArcGIS 10.1 Basic

I have performed supervised classification (Interactive supervised classification and Maximum Likelihood Classification) on landsat reflectance raster data to classify it into seven land use ...
1
vote
1answer
49 views

Can ArcGIS automatically round labels for a raster symbolised according to a classification? [duplicate]

I'm looking for a way to automatically adjust the reported precision of the label field for a float raster rendered in ArcGIS according to a classified symbology. Currently, the a classified raster ...
2
votes
1answer
49 views

Styling line layer based on two attributes in QGIS ? (1 discrete and 1 continuous)

I have found a really helpful tutorial to style points based on two attributes. Is it possible to make style lines based on two attributes? I have a shapefile with streets that have two attributes: ...
1
vote
0answers
26 views

qgis Semi automatic classification pluggin how to add text to rows in attribute table

I want to use a previously created shapefile as Training shapefile in the semi automatic cassification pluggin. Therefore i added 4 fields to this shapefile: Macro_ID (int), MCl_info (text), Class_ID ...
0
votes
1answer
37 views

Is there an Export All Features in View Extent equivalent with ArcPy?

I would like to dynamically classify a layer's symbology based on the current view extent. As in, quantities of a specified field will be classified into quantiles based on the range of values of the ...
1
vote
2answers
28 views

QGIS: Class boundaries

I have seen that people already had issues about overlapping class boundaries with the classification of graduated vector data. I am wondering if there is somewhere written in the documentation if ...
3
votes
1answer
231 views

SAR - Using the Intensity or the Amplitude for the classification

In a Sentinel-1 Level 1 Ground Range Detected SAR data product, Intensity = Amplitude * Amplitude. Should the intensity image or the amplitude image be used for radiometric calibration when using ...
2
votes
0answers
22 views

Tasseled Cap in ENVI

Im working on ENVI 5.2, with Tasseled cap (TCT). The resulted output from this process is in ENVI Standard format, which shows error when used as an input in Confusion Matrix... For this i want its ...
2
votes
1answer
57 views

NDVI in ENVI: Output format issue

I am working on NDVI in ENVI... the output file is in Envi Standard format... I required it in Envi Classification format, which can be done through Envi Edit Header tool... This requirement is for ...
2
votes
2answers
132 views

When is it best to use a Proportional Symbol Map or a Graduated Symbol Map?

I am having trouble understanding the difference between the two, or why it matters. How do these two differ from each other?
2
votes
1answer
28 views

Panchromatic Image Classification GRASS GIS

How to perform an unsupervised classification of a single panchromatic satellite imagery in GRASS GIS? I tried it many times but I keep being prompted for a second image or other images in the ...
1
vote
0answers
44 views

QGIS: How to exclude outliers from the legend classfication using an expression

I am trying to make an equal interval legend using a rate of burglaries per 1000 habitants using a combination of a column with the counts of burglaries and a column of total population using census ...
0
votes
0answers
28 views

NetCDF Qgis problem

I have a problem with importing a NetCDF file in Qgis. I added the file as a raster layer and I can see the layer. Now I want to change the colours by using the classify function in the properties ...
0
votes
0answers
24 views

Image and AOI files have different Map Info Error Message in ERDAS

I have a raster image at 15m resolution and trying to conduct subpixel classification in ERDAS. I extracted two AOI's (area of interests) from the image and used it for my signature derivation. But ...
0
votes
1answer
54 views

How to classify shapefile values in QGIS?

I would like to classify shapefile values using graduated style in QGIS, but instead of using the default mode of classification (e.g.natural breaks with values range 0-10, 10-20, 20-30), I would like ...
2
votes
0answers
86 views

Graduated symbols not appearing for all polygons

I'm using ArcGIS 10.2.2. Trying to map some city populations using graduated symbols. Should be simple, but while most of the polygons are being assigned symbols, some aren't. For example, in the ...
3
votes
1answer
141 views

Looking for example of a Random Forest tutorial to estimate spatial distribution

Could anyone point me to a Random Forest tutorial for predicting a spatial random variable? Or an easy dataset to try to work through. For Decision Trees and Random Forests, I found some very good ...
0
votes
0answers
44 views

Importing representations from a Layer File

I'm trying to incorporate representations as part of my data model. I have set up representation rule for my feature class, which is part of a feature dataset. The way I have the data categorized is ...
0
votes
1answer
52 views

How do I classify my counties to color the bottom / top 25% in area?

I have a map of my state with county boundaries. What settings should I use to color the counties based on their area but only if its area falls in the bottom or top 25% of county area? For example, ...
1
vote
1answer
119 views

Does anyone know a way to do a supervised classification on a google maps image to show only hedgerows? [closed]

I would like to then use the hedgerows by bringing it into QGIS as a layer. I need to know what software to use and the method to make such a layer? I would like to use a google earth image in Grass ...
2
votes
4answers
165 views

Export ground returns (.las) from classified point cloud

I have lidar data that is classified as several categories (water, ground etc.). I need to open this lidar data in some software (it will be great if it would be a open source software) and delete a ...
2
votes
0answers
46 views

What does “Information [18]: Select at least one signature” in the semi automatic classification plugin mean?

I am using the semi automatic classification plug in to classify vegetation and water in a satellite image. I create training shp and signature list. When i hit "classification preview" it gives me ...
1
vote
0answers
48 views

how to calculate distance in sub pixel mapping from Atkinson's paper?

Condition from atkindon's paper http://info.asprs.org/publications/pers/2005journal/july/2005_july_839-846.pdf for every sub-pixel the attractiveness Ai of a pixel i is predicted as a ...
0
votes
0answers
46 views

Unsupervised (ISODATA) classification in ENVI returns fewest classes possible

Running an unsupervised (ISODATA) classification in ENVI 5.2 consistently returns the fewest classes possible. For example, set to produce anything between 50 and 70 classes, the classification ...
2
votes
0answers
71 views

Remote sensing Classification and texture analysis compared with QGIS zonal statistics

Some back round: 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 ...
2
votes
1answer
106 views

Can I use TIFF files for zonal statistics in QGIS or ARCGIS?

I am completing a remote sensing paper and am doing most of the work in PCI Geomatica, where I have 2 separate files. One from running a texture analysis algorithm containing 6 band layers from a ...
2
votes
2answers
240 views

land Use land cover classification

I am working on Land Use/Land Cover Classification of the Hindon river(India) watershed extracted using Aster DEM. Landsat 8 scenes had been used and mosaicked for the required AOI using the Watershed ...
1
vote
0answers
112 views

How to create ROI in Semi-Automatic Classification plugin QGIS

while trying to classify landsat images, I get the following problem: I click on the pixel I want to define a ROI, but the ROI polygon that the plugin creates appears in a different part of the image ...
0
votes
1answer
81 views

Compare Multiple attributes visually

I am working on a project in which I want to take point features( tweets) and compare them to the GDP per capita of countries. I would like to have my end result be such as the following: GDP Class ...
0
votes
0answers
44 views

Image formats to use for land cover classification in Python? [duplicate]

I am supposed to classify images for different land covers or land uses in Python. I read somewhere that the spectral module of Python is required to do the processing of Hyperspectral image data. ...
1
vote
0answers
17 views

Does fixed classes exist in QGIS?

I'd like to create several images of voronois polygons in QGIS; each images having differents values joined to the voronois. I tried to load a qml style with the values I want to keep (8 classes : ...