Use this tag for questions about creating vector features automatically from raster data using image processing techniques.

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1
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0answers
26 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 ...
0
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0answers
29 views

Easy way to digitize DSM for feature extraction

I have a Digital Surface Model (DSM) that I would like to digitized to extract features (buildings, etc.) using ArcMap 10.1. I would like to know if there is an easy way to digitize the DSM or to ...
1
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2answers
113 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 ...
0
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0answers
35 views

overlap test of raster and polygon

I have a shapefile with many polygons and many raster datasets (tif). Now, for each polygon I want to extract its area from the each raster datasets overlapping the polygon and save it to a new ...
5
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0answers
44 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 ...
0
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0answers
19 views

quantitative feature extraction from remote sensing imagery

I'm looking for a software to extract quantitative data from satellite images. I need for example the length, width and orientation of a particular feature (mountain ridges, drainage networks, roads, ...
2
votes
2answers
87 views

Counting plants in aerial images using unsupervised classification?

I am relatively new to GIS and I have the following problem: I want to extract the number of plants per row in a crop land. I have and RGB mosaic from aerial images. I think that I could do an ...
1
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0answers
38 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
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2answers
203 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 ...
0
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0answers
87 views

How to collapse dual lines to centerline in QGIS?

I'm in the process making of semi-automatic feature extraction from printed map tool. The feature I need to extract was a line, but on the map it's obviously in a raster data model. So after Raster ...
1
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5answers
113 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 ...
10
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1answer
166 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 ...
4
votes
2answers
55 views

How to extract nodes with PostGIS to a multipoint geometry

I have a line in a PostGIS table test_line. I want to extract it's nodes into a multipoint geometry. I tried the following: SELECT ST_Collect((ST_DumpPoints(the_geom)).geom) FROM test_line; But it ...
0
votes
1answer
50 views

How can we 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? If possible how can we use ERDAS Imagine ...
1
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0answers
17 views

QGIS Extract elevation data only for one country [duplicate]

Hye, Here a map built with (1) a shape file for country contour, and (2) raster from .hgt files with altitudinal representation. How can I only select the area corresponding to the country ? I found ...
4
votes
2answers
244 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 ...
1
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0answers
28 views

Extract values to point - values not being extracted

I have a single band raster. When I use the information select tool I can see pixel values. I also have a shape file made up of points sitting over the raster. I want to extract the pixel values from ...
3
votes
1answer
75 views

Check for feature existence before extract by attribute Arc GIS Model Builder

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 ...
3
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0answers
332 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 ...
6
votes
1answer
342 views

Ditch Extraction using LIDAR DTM (1m resolution)

I'm trying to extract ditches using the LIDAR DTM using the software eCognition but I am actually having a hard time since the paper where I based my workflow entitled "Ditches’ network extraction and ...
8
votes
1answer
309 views

River boundary (bank) extraction from LiDAR

Is there any way to extract a river boundary (bank) from LiDAR data and its products (DEM, intensity image and slope) automatically? Digitizing is very time consuming.
1
vote
1answer
107 views

Preserve attribute table while using extract by mask in arcgis

On using the Extract by mask function on a raster with several columns (beyond value and count) in the attribute table, the resulting raster does not have all the columns (it only has value and ...
0
votes
0answers
136 views

Extracting shape point coordinates from polylines in MapInfo

My question follows from Coordinate extraction in a different projection in MapInfo . I now have WGS84 begin and end coordinates for the polylines(which are in british grid coordinates) How do I now ...
0
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0answers
55 views

Is there a way to retrieve/query country data from a shapefile programmatically using map coordinates in GeoTools?

I am using Geotools to parse and draw a shapefile. Now; when I draw that map I receive coordinates with this bit of code for my Flight Line button. void selectFeatures(MapMouseEvent ev) { ...
0
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0answers
129 views

I am getting NULL values when I use “point sampling tool”?

I am trying to extract values from a raster using a point shapefile, but I am getting NULL values. I think that NULL values are obtained because the Coordinate Reference System (CRS) are not the same ...
0
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0answers
46 views

RGB Imagery Layer - Feature Extraction

I'm looking for information on Feature Extraction from the Ordnance Survey Mastermap Imagery Layer. This could be technical information, research papers or just sound advice from folks on this message ...
2
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0answers
141 views

Ecoregions shapefiles: subsetting, extracting and summarizing data from raster

I am attempting to subset and project an ecoregions shapefile from : EPA ECOREGIONS my data set is found here: SHAPEFILES and RASTER When I run this code, two major problems occur: 1) I cannot get the ...
7
votes
2answers
565 views

How to extract vectors from map using QGIS?

I am trying to extract building footprints from a raster map (as shown in the example below). Please note that the maps are out of copyright, have been scanned and georectified by a library and have ...
0
votes
0answers
111 views

OBIA following connected components segmentation in Monteverdi2

New to Monteverdi2 and OTB. I just finished a connected components segmentation using the Segmentation module and the large-scale vector output mode for large datasets. How can I filter the output ...
1
vote
1answer
25 views

RasterStack extract() for duplicated dates

I have a a Large RasterStack of temperatures and a 10570 points in a Large SpatialPointsDataFrame and I'm using extract() to assign the temperatures to each point in R. ...
1
vote
2answers
212 views

How do you remove isolated roads from a bigger network?

I'm trying to perform an OD Cost Matrix calculation on a set of points using a road network from OpenStreetMap data. The network contains lots of roads that don't connect to the rest of the network. ...
2
votes
1answer
209 views

Extract/Split raster dataset by attribute (OBJECTID)

I have a raster dataset with an attribute table generated from a series of image classification (unsupervised) and processing tools (majority filter + boundary clean). The attribute table shows pixels ...
2
votes
1answer
429 views

Hydrology tool dataset in ArcGIS 10.1 for calculating slope?

I am quite new to the hydrology toolset in ArcGIS and thought it may be useful for extracting slope data from a raster; I was wondering if anyone had experience trying to extract slope data upslope ...
0
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0answers
65 views

Los Angeles Public Parking Lot Polygons?

So, I'm looking for some relevant data to incorporate into my map, and one of them is public parking polygons. Is there such a .shp file with these data?
1
vote
1answer
658 views

ArcGIS 10.2 Extract Polyline from Start/End Coordinates

I have two files. A polyline shape file of highways and a spreadsheet that contains beginning and ending coordinates w/ descriptions of segments of the highways. For example: BegX, BegY, EndX, EndY, ...
0
votes
1answer
379 views

Summarize values from a raster brick by latitude bands in R

I would like to sumarize (sum and/or mean) values from layers on a raster brick based on latitude bands (been using raster package). Been looking at the package documentation and didn't find a way to ...
3
votes
0answers
101 views

Creating a new raster based on pixel value of original raster using raster calculator but new layer is not evident

I am trying to create a new raster based on a current raster (w001001 - NVIS) which has one paletted band, with palette values ranging from 1 to 29, with each palette/value representing a vegetation ...
15
votes
4answers
769 views

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 ...
0
votes
1answer
387 views

Merging Multiple Paths

Alright, I'm going to start by using Google Earth terminology because that's where the original need for a solution came up. I have multiple paths (54) that I want to merge into a single path. ...
1
vote
2answers
599 views

Extract pixels from NDVI in ArcMap

I have a NDVI that I created from a Landsat 5 image. Is there a way to extract all the pixels above a certain threshold and save it as a shapefile? I am trying to create a vegetation mask of sorts to ...
5
votes
1answer
179 views

LiDAR Feature extraction specifications/standards

I have vector data representing forests/trees/buildings that have been automatically extracted from LiDAR data. I am looking for specification/guidance for LiDAR derived products, or any standard for ...
7
votes
2answers
333 views

Practical Building Extraction Algorithm Implementation

I've been reading many papers over 3D building extraction using LiDAR data and Aerial images. I see that there are many different algorithms for doing such things, such as this and this. Those ...
2
votes
1answer
55 views

Trying to extract arc information from a Suburb shapefile

I downloaded some shapefiles from the Australian Bureau of Statistics (ABS) Its basically showing a bunch of suburbs when I view the shapefile through a GIS tool. The GIS tool that I am using at ...
1
vote
0answers
281 views

Feature Extraction from LiDAR in Erdas 2012 or ArcGIS10.1

I know it's possible but I just can't find or figure out a workflow for it. Erdas Webinars has the workflow for ver 2011 but this is very different in 2013 as it uses a raster img file instead. I ...
1
vote
1answer
167 views

Easy Extraction of features from a Feature dataset ( Not feature class)

My Feature dataset (residing inside a GDB) contains more than 30 feature classes and every month I like to extract features from this GDB based on one attribute, which is repeating in all the feature ...
1
vote
1answer
88 views

Near / Near Table creates -1 values

I have two feature classes. Point feature of hand-sampled GPS locations Line feature of terrace walls digitized from aerial photograph. Because of the less than perfect ways I generated these ...
2
votes
1answer
177 views

Extract number of vertices in each polygon in R

Simple question: how best to do this? I've found one way that works, but this is very slow (when x is a SpatialPolygonsDataFrame): y <- fortify(x) n.verts <- aggregate(y, by=list(y$id), ...
4
votes
2answers
314 views

How to extract values from intersection of different size buffers with raster?

I have a polygon shape with buffers. However, the buffers are of different size from 4m radius to 15m. In total I have 7 different buffers. I have a landcover raster and I would like to extract ...
3
votes
1answer
560 views

Extract multi values to point error

I am trying to extract values from my rasters : slope, aspect, landcover etc. for my animals group locations. I used Spatial analyst>Extract multi values to points but when I look in my attribute ...
2
votes
2answers
395 views

Create polygon of buildings from Quickbird images in QGIS

I have Quickbird/Ikonos/GeoEye image and want to extract all the buildings from the image as an independent layer in QGIS. How can i achieve that?