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3
votes
1answer
38 views

Extracting points bordering shape extent

I'm using ArcGis 9.31. I have a set of points as elevation and in order to get a soft clip area for the TIN, I would like to extract only all the points bording the extent of this shape, or to get a ...
2
votes
1answer
48 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), ...
3
votes
2answers
61 views

Buffer of different radius - Intersect 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 ...
0
votes
0answers
32 views

Extract elevation data from arcglobe

Im trying to create a small 3d trail map and therefore need to get elevation data for the 3d visuals. I've already visited the USGS site and downloaded some DEMs, but they just dont look right even ...
0
votes
0answers
41 views

R-raster versus ArcMap Bioclim clipped values differ?

I have a set of lat/long ccordinates for which I wanted to pull corresponding BioClim (1-19) values. I first used ArcMap, without interpolating, and came up with a set of data. I then used R's ...
2
votes
2answers
104 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?
16
votes
3answers
622 views

How to create a polyline-based “heatmap” from GPS tracks?

This winter I am planning to track my downhill skiing/snowboarding using a GPS. Most of my riding will occur at the same resort. I would like to be able to create a sort of "heatmap" that shows the ...
3
votes
3answers
202 views

How to extract raster values and create new raster in Qgis?

I want to extract certain values of a raster image in order to create a new raster which then should only contain the extracted/chosen values. How to do this in QGis?
3
votes
2answers
586 views

Extract raster by mask output does not completely overlap the mask

I have a flow accumulation grid and a shapefile containing catchment areas. Now I want to do some calculations on them so I need to extract data from cells in the raster adjacent to certain catchment ...
6
votes
1answer
612 views

Can I specify a point and get all features within a certain radius of this point?

I have recently shifted to QGIS from ArcGIS and am looking for some help/pointers with the following: Does QGIS have a method by which I can specify a lat-lon coordinate (or a utm x,y coordinates, ...
5
votes
3answers
320 views

Extract Overlapping Polygon Data to Points

I have a polygon data set of corn yield collected by a combine. However, as the combine drove through the field, there was slight overlap between passes, leading to overlapping polygons within the ...
5
votes
2answers
192 views

Extract certain area of contours/satellite images

I have 2 satellite images (jpeg2000 format) and 2 xyz-files from the same area. I am trying to extract certain region from the area including contour lines and the satellite image in order to import ...
2
votes
1answer
135 views

How to extract a single road from OSM GIS Database?

Is there a way to extract a single row out of the OSM-GIS-Database (by a Query). It would be so much easier, if I could find an EER Model of the Database. I was searching a long term and found very ...
3
votes
1answer
127 views

Extract pixel value for corresponding gps location in R

I have animal gps data with several locations for each day and regular gaps of several days when no location of the animal was recorded. Additionally, I have satellite data in intervals of 16 days. I ...
4
votes
1answer
910 views

Lidar - Automated building extraction (Improve Process)

I have the following process for automatically creating building outlines/footprints from Las files and was wondering if anyone can help improve it or has suggestions for other processes to use? ...
3
votes
1answer
344 views

Extract data from QueryLayer to Shapefile

I have a QueryLayer that I need to export as a shape file. This was previously implemented as an ArcSDE feature class which we converted to a QueryLayer (running against SQLServer) in order to have ...
0
votes
1answer
147 views

What is the easy way for extracting a dted raster file?

i have some srtm data which was converted to dted file with globalmapper or arcmap ascii to raster. i want to extract raster from vector with easy way.. i have tried "extract by mask" method but it ...
0
votes
1answer
408 views

Fields from a selected feature set are missing when gp.submitJob(..)--in Flex— pushes feature set to geoprocessing service (in Python)

I am extending existing query functionality that I have added to the ArcGIS Flex Viewer. I would like to extract the results from a query--which consists of a FeatureSet--into a .gdb. In order to do ...
2
votes
2answers
192 views

How to remove roads from dataset

I've got a shape file that I loaded into PostGIS that has both road and parcel multipolygons and I need to remove the roads. I tried loading the shp file in qgis and it loads them both as a single ...
2
votes
3answers
379 views

How do I extract beginning/ending points for polyline shapes?

I need to extract the beginning/ending coordinates of every shape within a polyline shape file. It would be best to actually add them as values within the shape files .dbf (I can live without doing ...
8
votes
3answers
1k views

Land Cover Feature Extraction from Satellite Imagery

I'm interested in a low-cost or open source solution for creating land cover GIS layers that utilize both spectral and textural extraction algorithms. I have used PCI Geomatica, ENVI, and Feature ...
4
votes
0answers
143 views

What open source solution would work best for auto extracting features from satellite images? [duplicate]

Possible Duplicate: Feature Extraction - Land cover I have been looking for an open source solution which would allow me to define a region (or collection of images) and extract features ...
2
votes
0answers
865 views

Extract parcel layers from vector pdf

So, I have an interesting problem... I have a PDF file which has over 100 pages and each of these pages is displaying a map in vector format. By using some third party program I was able to find out ...