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Questions tagged [feature-extraction]

Creating vector features automatically from point cloud (LIDAR) data or raster data using image processing techniques.

1
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1answer
78 views

Digitize objects in a LiDAR point cloud?

I am working with LiDAR point cloud data of road networks. The goal is to digitize all visible objects like hydrants, streets, sidewalks. My input data is available in LAS or ASCII format. My first ...
0
votes
1answer
222 views

Extract value from shapefile in Google Earth Engine

I'm new in Google Earth Engine. I want to extract the value of NDVI for a series of MODIS images using a shapefile and after export the database. This is my script: var vect = ee.FeatureCollection("...
0
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0answers
15 views

How to isolate of building class from ground truth (GT-Potsdam) in ArcGIS?

How to isolate of building class from ground truth (GT-Potsdam_Raster file) in ArcGIS? (I just need building and clutter(background) classes in GT) Impervious surfaces (RGB: 255, 255, 255) Building (...
0
votes
1answer
91 views

Batch ENVI IDL PointCloudFeatureExtraction results in unprocessed areas [closed]

I have an IDL-ENVI code to batch PointCloudFeatureExtraction for lidar tiles across a large area, however, when run, the output results in lower areas of each tile as "unprocessed". So my question is ...
0
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1answer
137 views

ArcMap Building detection [closed]

Utilizing only ArcMap 10, is there a way to set up a tool that will automatically detect building footprints from aerial imagery and then build a polygon on them? It doesn't need to be incredibly ...
0
votes
1answer
167 views

Extracting features from High Resolution mosaic (tiff)?

I have a very high resolution map(tif) i.e. drone image as shown in the image. Is there any way we could extract features including building and road etc. from high resolution image?
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0answers
25 views

How to pick up features from an aerial photo [duplicate]

I am new to GIS. I was wondering if there is any existing method to extract features from an aerial image? Specific features like shelters and playground. If it helps, I have the file with the ...
0
votes
1answer
94 views

National Land Cover Dataset (USA) Data Extraction

I have downloaded the NLCD 2011. It has different formats of files (i.e. .rrd, .ige). I tried to open the (.rrd) file using ArcGIS 10.5.1 but it couldn't open it. Can you suggest me how can I view ...
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0answers
52 views

Extracting Roads and Trails from SPOT Imagery

Is it possible to extract Roads and Trails vectors from SPOT Raster Tiff Image? Actually I have tried SPRING software to extract road vectors from this raster. Yes, It gives good result, But ...
7
votes
1answer
835 views

Extracting building footprints from Sentinel-2 imagery

My attempt to extract building footprints from Sentinel-2 images using machine learning algorithm trained on Sentinel-2 images produced a lot of false positives and there is no sign that the algorithm ...
9
votes
2answers
243 views

Identifying Joshua trees with LiDAR data?

I'm working on a LiDAR project to determine where Joshua trees are located within a specified study area. Due to the vegetation cover being so sparse, there are really on 2 canopy species there, which ...
0
votes
1answer
66 views

Detection of avalanche debris based on their distinctive shape

I want to detect avalanche debris of a known avalanche using Sentinel-2 optical imagery. I've calculated the Normalized Difference Snow Index and from there I've extracted all the values above 0.4 ...
3
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0answers
515 views

Using WATERSHED to delineate tree crowns in ArcGIS Desktop? [closed]

I'm trying to delineate and count trees from a DSM/DTM generated from a UAV survey. It's from a citrus grove where trees are growing in different spacing. I have developed a workflow that works for ...
1
vote
0answers
90 views

QGIS: Extract rows of grape vines from inter-row vegetation using a 3D point cloud

I have some multi spectral imagery (raster data) from a UAV of vineyards in Victoria, as well as corresponding 3D point cloud (also raster) of the vineyard topography, based off ultrasonic sensing, ...
1
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0answers
98 views

Export Features by Multivalue?

I have a similar problem to the user in this question from a couple of years ago: How to Extract by Attribute Using ModelBuilder with User Input? Except when I go to build the model, the "Values" ...
2
votes
1answer
159 views

QGIS 2.16 Extract Nodes command works strange

On Qgis 2.16 when I am using the extract nodes command, even when I save to file with a specific name, the result is a layer named "Nodes" with the extracted points. I have to go to the folder where I ...
5
votes
2answers
227 views

Pattern search in satellite imagery

I would like to search for the specific buildings (polyhouse in my case) on the map like the one shown here Are there any free options available which can give me lat and lng of such shapes/features ...
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0answers
142 views

Extract specific altitude curve from raster

Is there any way one can extract a specific curve from a raster DEM qith QGIS? I know I can extract all curves, specifying the desired altitude interval between curves. But I was interested in ...
1
vote
0answers
41 views

exclude value from feature analysis classification (ArcGIS extension)

I am using feature analysis to classify small (mm) round features from the landscape. I have calculated the circularity of each shape and I want to exclude those which are not round enough. Does ...
2
votes
1answer
483 views

Issues with raster data on postgresql / error:Attempting to get pixel value with out of range raster coordinates

So here is the issue, i am trying to extract values from a big raster divided in 200 or so tiles and applying them to a selection. The points are startpoints, endpoints and midpoints from vector items,...
0
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3answers
257 views

Extracting impervious areas (buildings, rails, pavements) from LAS dataset [closed]

How to extract impervious areas (like buildings, rails, pavements etc.) from las dataset and receive it like a raster? I tried to do it with intensity, but there are many valids with vegetation. I ...
4
votes
1answer
168 views

Extract manhole covers from ground LiDAR

I am wondering if anyone has come up with an automated or semi-automated workflow for extracting manhole covers from LiDAR data in ArcGIS? I was thinking about looking at the change in elevation ...
2
votes
2answers
418 views

Extracting coastline as vector from landsat 8 imagery?

I am trying to detect some sea level rise/fall for a specific region, from Landsat imagery. I went through the recommended methods of identifying water/land (MNDWI, AWEI, Bandratio 5/2, etc.). Now ...
9
votes
1answer
701 views

Counting number of plants in area using images from UAV? [closed]

How do I count the number of pineapple plants in a 1-hectare block? I have heard of these algorithms but I don't know how to do it. I'm still a newbie of QGIS, ArcGIS and ENVI. I have the NIR, RGB, ...
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votes
1answer
99 views

How are digital maps generated? [closed]

This is a more of a noob GIS question. How are all the features on the maps we come use know and love (Google Maps, Bing Maps) generated from imagery? Does somebody actually look at the imagery and ...
0
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0answers
93 views

Generating outlines of islands using QGIS?

I have a (raster) satellite image showing islands. I wish to extract the boundary (shoreline). I tried a simple classification with just two groups (land and water). Unfortunately too many ...
0
votes
1answer
224 views

Extracting features from raster data using ArcGIS Desktop?

I want to extract flood related pixels from my imagery. I calculated mLSWI(Modified Land Surface Water Index). According to the literatures, mLSWI >= 0.5 is flood pixels. How do I identify the ...
3
votes
0answers
233 views

Improve tree extraction method

I want to extract trees from a given normalized Digital Surface Model (nDSM) in SAGA GIS. My workflow is the following: Applying a Gaussian Filter to the nDSM with search radius with standard ...
1
vote
0answers
68 views

How to extact very narrow water linear features from GeoEye-1 image

I need to extract beaver channels from a GeoEye image (attached image). What is the best approach to automatically delineate such very narrow and not very sharp water features?
0
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0answers
230 views

Extract features from satellite images and store the features as a shapefile?

I am trying to identify boundaries, blocks etc from Satellite images which are stored as GeoTIFF files. I want to extract fields, buildings etc. by feature recognition and store that as GeoJSON/...
6
votes
4answers
5k views

Converting NoData to 0 values in ArcGIS Desktop?

I have a raster of landcover that I have reclassed and the different land cover classifications are now represented by numbers which correspond to fertilizer inputs. Using ArcGis 10.3, I am trying ...
3
votes
2answers
1k views

Raster image thresholding using python

Can someone guide me for applying thresholding technique to input raster image using Python. I intend to extract impervious surfaces from a high resolution raster such as roads, sideways and ...
4
votes
1answer
771 views

Orthogonal correction of building footprints after extracted from a raster

I have ArcGIS 10.1 and am working on a project involving extraction of vegetation and building classes from LIDAR (unclassified) data and aerial imagery (resolution 30x30cm). I have managed to ...
1
vote
1answer
658 views

Identifying dwellings/homes from imagery using ArcGIS for Desktop?

I have a task where I need to identify dwellings/homes on property lots. The data that I have is an aerial image of the town, cadastre/property boundaries, land tenure information and land-use. I ...
1
vote
1answer
126 views

Seeking program to highlight and calculate multiple areas on satellite image? [closed]

I would like to calculate the area of all the parking spaces in my city (North Miami Beach). I would highlight the parking in two layers, commercial and residential, and then export it to Excel and ...
0
votes
1answer
346 views

How to separate details by color from raster?

How to separate details by color from raster? Is it possible in ArcGIS or any other software? I have tried Spatial Analyst. I want to use RGB .tiff image which is scanned map. It consists of all the ...
1
vote
1answer
198 views

Algorithm to detect entity (aircraft, ship, etc) intrusion into geographic area [closed]

I have been tasked with coming up with an algorithm to determine whether or not an entity (aircraft, ship, etc) is inside or outside of a geographic area defined as a set of geodetic (lat/long) ...
1
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0answers
71 views

How can I get a remote village transportation network from openstreetmap?

How can I get such a remote village transportation network from openstreetmap? nodes represent remote villages links represents public transportation tools, like buses Something like that: It is ...
2
votes
2answers
542 views

How to automatically convert dots on paper maps to vector points?

I have several paper maps with dots that I need to convert to vector points. I was hoping to get some suggestions on how to accomplish this without recreating each and every point by hand. I know ...
7
votes
1answer
273 views

Extracting wall information using LIDAR data?

I'm trying to extract wall using the LIDAR. I have tried Fusion, Whitebox, Lastools in Arcgis, Saga and Envi. Those are tools that I can use. The walls I am interested are mainly 1 meter high. Some of ...
2
votes
2answers
1k views

Counting plants in aerial images from UAV [closed]

I want to extract the number of plants per row in a crop land. I have and RGB mosaic from UAV orthorectified aerial images. I would like to be able to identify single plants in order to count each ...
1
vote
0answers
212 views

extract roads, railways and canals out of old orthophoto

how is it possible to extract the roads, canals and or railways out of this image (black-white)? Or how is possible to create lines at the edges of the roads, canals and or railways?
3
votes
2answers
319 views

Draw Paths Automatically

I have the following data: The pink represents digitized hiking trails done on a different software that is completely inaccurate compared to raster images. They do however have attributes with the ...
1
vote
6answers
734 views

In what real-world examples do users still digitize features from a map?

Is digitizing of map features completely dead? For example, when and why do you still digitize features from a map? It can be heads digitizing up from a scanned paper map (or image, or whatever) or ...
11
votes
1answer
367 views

Automated detection of tracks

Given an area with depressions in open area from; say all terrain vehicles driving on soft surface. The vehicles will cause parallel depressions (paths) of about 10-20 centimeters in depth and around ...
0
votes
1answer
324 views

Extract feature for automation method using ERDAS Imagine 2013 software?

I have Quickbird Satellite data, hence I want to extraction from Building foot prints using automation method. Could you give whether its possible or not using ERDAS Imagine 2013?
4
votes
2answers
522 views

Why use feature extraction?

Why is feature extraction important? Why do we have to reduce the feature space? Is it only a computational problem when we use hyperspectral imagery or does this procedure improve the ...
5
votes
0answers
1k views

Single Tree detection in ArcMap? [closed]

I was wondering how I could extract "crown area" of single trees in a forest from a high-resolution image with only 3 band (RGB) in ArcMap. ( No NIR to use NDVI as any threshold). I need a fast easy-...
3
votes
1answer
181 views

Checking for feature existence before extract by attribute in ArcGIS ModelBuilder?

I have a model that runs through a series of Rasters in a folder and extracts individual crops as layers cyclically. The problem is that if the crop is not grown in a particular state, the model ...
5
votes
1answer
1k views

Extracting flow accumulation to stream shapefile

I would like to create a shapefile that displays the flow accumulation for a given point in a stream channel. Is this possible? My client wants a map that shows the accumulated flow/catchment area ...