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1500 questions
17
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2 answers

What are LiDAR returns?

Can someone help with an explanation and some references, in order to understand the nature of return pulses within a LiDAR system.
DiegoS
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17
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6 answers

How to update a popup content from its marker?

I created a popup with Leaflet doing so: marker.bindPopup(content).openPopup(); How can I update the content value afterwards? I suppose to do it from the marker, something like this: marker.updatePopup(newContent);
Yako
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17
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4 answers

Need to Quickly Add Multiple Layers From Multiple Folders To QGIS Project

I have downloaded several imagery Zip files (content of each is jp2, jpg, jpw, xml, htm, and .dbf, .prj, .sbn, .sbx, .shp, .shx) and would like to quickly add this imagery to my working project in QGIS 2.6.1. I am trying to avoid having to navigate…
reevesii
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17
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2 answers

Help choosing a suitable routing engine

I am building a route planning system, but i have still to decide what underlying routing engine i will use. So far i have found pgrouting and neo4j. I have my route network in a postgresql/postgis database (imported from a shapefile). I have made…
mrg
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17
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5 answers

Appropriate map projection for the Pacific Ocean

I've found this map that shows the Pacific Ocean from http://www.transpacificproject.com: I'd like to produce a similar map, for the same region of the earth and I'd like to use the same projection as I think it illustrates well the distance…
ivanmp
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17
votes
4 answers

Get Center of Geometry in OpenLayers 3

Given a Geometry object in OpenLayers 3. How would one go about getting its center? Older versions of OpenLayers provided a getCentroid method. There was also a getBounds workaround. But these appear to be removed in OpenLayers 3.
Joseph Ravenwolfe
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17
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1 answer

Adding search box to Leaflet.js

Consider the example in the following link for Folium: US Employment visualization per county. The result looks like what you see below:     I would like to add a search box to it to be able to search by city, and have the visualization zoom in…
Amelio Vazquez-Reina
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17
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2 answers

Changing unit of measure from degrees to meters in QGIS?

I am running QGIS 1.7.0 on windows, and I donwloaded a shapefile of census block group boundaries from TIGER. This file appears to be in the WGS 84 coordinate system, and when I open it in QGIS the unit of measure is degrees. I tried re-projecting…
Zach
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17
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3 answers

How to split text attribute by characters in QGIS?

Is it possible to make a new column, for example named "Test" and store the first part of the column "Name" split by -? See below how it should look like:
Danny
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17
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4 answers

Gdal: clipping a raster with another raster

I'm writing a simple utility to crop batches of multi-band geotiff raster files to the same (smaller) area. Using gdalwarp, I can easily crop a file using a single-polygon clipping shapefile: gdalwarp -cutline clipper.shp -crop_to_cutline input.tif…
Joe
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17
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6 answers

Deleting duplicate geometry in PostGIS tables

After - I don't know what happened - all my entries in my PostGIS tables are doubled. I tried this to delete them but it does not delete any/all duplicates: DELETE FROM planet_osm_point WHERE osm_id NOT IN (SELECT min(osm_id) …
MartinMap
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17
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6 answers

How to use ST_Intersection?

Here's a quick summary about what I'm trying to do: I have 3 tables in Postgres, 'a' and 'b', each have a Polygon column, and 'c' has a Point column. What I'm trying to do here is to get the geometries intersections between 'a', 'b' and 'c', and to…
Uriel
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17
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2 answers

Create "mean" line from multiple lines using QGIS

I have multiple lines features (also have them in multipoints...) representing similar path (mountain trails, in this case) with various GPS precision, resulting in many lines close to each other, but not perfectly overlapping. For the purpose of…
Horizen
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17
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6 answers

Seeking current geostatistical analysis classes/events

I am interested in geostatistics. I am not very programmatically inclined but have been following several lists with this theme. One being the R filter on Stack Exchange where I get occasional digest emails of questions. I find that there is an…
Brad Nesom
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17
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3 answers

Parallelising GIS operations in PyQGIS?

A common requirement in GIS is to apply a processing tool to a number of files or apply a process for a number of features in one file to another file. Much of these operations are embarrassingly parallel in that the results of the calculations in…
Mr Purple
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