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Questions tagged [image-analysis]

Image analysis is the extraction of meaningful information from images; mainly from digital images by means of digital image processing techniques.

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Describe the texture features of the image through a single value in R

My purpose is to describe the characteristics of the texture of the image through a single value (eg, second angular momentum ASM), similar to what Haralick presents in Figure 4 of his article. The ...
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Why does ArcMap's Apparent Reflectance function call for Radiance Gain and Radiance Bias?

This documentation, as well as the function properties window, call for Radiance Gain and Bias to produce what ArcMap is calling "Apparent Reflectance" -- a term I am not otherwise familiar with. My ...
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1answer
32 views

Image segmentation error 999999 with NAIP in ArcMap?

I'm trying to do object-based image analysis on a portion of the NAIP 2016 aerial imagery for Washington (4-band, 8-bit unsigned). Image: The NAIP file I'm using is accessed through a USDA server. To ...
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2answers
122 views

Separating spectral similar training sets to improve accuracy of classified Landsat scenes in ArcMap?

I am classifying Landsat TM scenes of the entire Chesapeake Bay as part of my Master's research in ArcMap 10.3. For these scenes, I am classifying the following land cover types: water, forest, ...
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2answers
318 views

Classify a slope raster in Image Analysis

I have a DEM in a Mosaic Dataset covering a large area (300 x 200 km). I want to create a classified slope raster showing slopes of say 0 - 10 degrees, 10 - 20 degrees, and then 20 - 90 degrees. ...
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1answer
113 views

Saving a clipped image analysis raster

I have a raster that I clipped to a polygon using the image analysis window (regular raster clip doesn't do what I want) but when I go to save the temporary raster to a hard file I get the same ...
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1answer
290 views

Different values for NDVI from different techniques

I'm trying to calculate NDVI from Landsat 5 imagery. I'm using ArcMap 10.2.2. I know that the formula for NDVI is (VIS-INFRA)/(VIS+INFRA), where in Landsat 5 VIS= band 3 and INFRA= band 4. When I ...
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1answer
147 views

ArcGIS: Legend patches turn black with negative contrast

I have a problem I've never seen before in ArcGIS (Desktop 10.4). When I use the Image Analysis Window (or symbology settings), the raster DEM in the background changes accordingly... HOWEVER when I ...
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1answer
102 views

Difference between Image Analysis Window and other associated tools?

I've been unable to find some concrete ESRI documentation on this. What are the differences between the Image Analysis Window tools and the corresponding tools in other toolboxes? How come the Image ...
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1answer
58 views

Performing change analysis between two time series images (2010-2000)

I performed the difference between two images, 2010-2000, with the command in Arcmap10: Image Analysis and raster difference,based on the pixel value difference in the two image tables (2010, 2000). ...
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2answers
473 views

Nearest Neighbour Classification in eCognition

I have a few papers and youtube videos explaining how to conduct the NN classification in eCognition but it isnt giving me any output. I think the confusion is arising when trying to define the ...
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1answer
2k views

Image segmentation in open-source software

For an analysis of several multilayer raster files I want to perform some kind of image segmentation (multi-resolution, ...) to extract polygon object of similar raster properties. I know that Trimble'...
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1answer
49 views

Cropscape Change Analysis

I have two raster data layers from cropscape for 2014 and 2015 that have been clipped to Fresno County. I want to look at the change in almonds between these two years (if and where almonds were added ...
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1answer
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Aerial picture - how can I extract water drainages on a crop (to vectorize them)

I have a RGB aerial picture of an agricultural crop. The drainages (hundreds of them) can be barely seen because they a very slightly greener then the surrounding crop area (picture is from April). ...
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0answers
657 views

How to create an annual NDVI from Landsat 8 imagery [closed]

I am relatively new to GIS. I am studying wildlife (I have collar data that lasts a year) and my supervisor and I would like to create an annual NDVI map for my projected area. I was able to ...
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1answer
2k views

How to smooth NDVI raster (Sentinel 2-A image) in ArcGis?

My question is regarding the final display of a NDVI raster. I currently work with ArcGIS Desktop 10.2.2. When I work with Landsat images (the image is loaded as composition through the MTL file, ...
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1answer
112 views

Conversion of multispectral image to grey scale

I have a composite with four bands NIR, Red, Green and Blue. I would like help on which weight values to use when converting it to a single band which will then be used to classify vegetation. I am ...
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1answer
124 views

Is there any comprehensive book or online instruction on image segmentation techniques? [closed]

I'm looking for a source to learn theoretical basis of image segmentation techniques thoroughly. The desirable book, or other kinds of source you may know, should cover the techniques that are more ...
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5answers
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Is there a tool that performs automatic recognition of buildings?

I'm wondering if there is a tool, which takes a satellite map of a region, detects typical buildings and allows the user to review its result (check, whether the tool correctly identified the ...
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2answers
1k views

Applying stretch in ArcGIS Image Analysis Window?

I need to apply stretch to ArcGIS 10.1 exported raster. The best way to accomplish this task: Image Analysis Window, because there are fine tools to equalize raster data. 1 - This is my IRS-P6 24m ...