Any way to read bathymetry surveys (*.xyz) into QGIS as a TIN or as raw points?
4811
Is there an easy path to visualizing LIDAR data in QGIS?  I have some USGS LIDAR data in .las format downloaded from . This means I have both the .las and metadata in .xml format. I am aware , but not how to apply it to this task. I am running on Ubuntu 11.04 with QGIS 1.7.0-Wroclaw.  A similar question for ArcGIS is:  . I just need to get a sense of this data and the registration. Conversion to a DEM would be OK if I can visualize it.
106021
How do I add .e00 data into my QGIS project?
123223
I am trying to display certain features in a shapefile-based layer using QGIS. I have found the subset function in the properties panel, which does exactly what i want, but is too tedious given that I have to manually sift through a large number of features. Is there a quicker way to do this?  I am using both shapefiles and postGIS best,  dietmar
46813
I have a map I've made in QGIS which is points from a .csv file. These have then be turned into different symbols based on what they represent and then the sizes of said symbols based on values in the .csv.  I need to export this as a .dxf to use in AutoCAD so it basically looks the same as it does in QGIS. However, when I do so it just exports as single dots (points). Is there a way I can export them as the symbols as I can see in QGIS?
70040
I want to  create a small web application to visualize election results on a per poll site basis for my city. The result is going to be very similar to what has been done for Berlin . Hopefully this helps in understanding what I'm going for.  The election raw data on the scale I need is published and I know how to visualize this on the grounds of a shapefile with separate polygons lining out the election districts. My problem is - as you could probably guess - that something like this doesn't already exist.  What actually is published though, is a PDF file lining out the borders of the districts I'm interested in:   I'm not keen on redrawing the linework myself, so I'm looking for a way to make a shapefile out of this. Luckily, the PDf includes the linework as separate vector objects, I extracted these into a SVG file:   I already tried converting the SVG to a DXF and importing it into qgis 2.0.1. This actually works, but (as expected) places the vectors in the atlantic ocean and I can't find a way to edit it and fix this.  What can I do now to georeference these vectors with open source tools and finally produce a shapefile?
93465
I'm looking for a rather basic PostGIS viewer. It should be possible to pan, zoom and retrieve coordinate information on mouse click. No need to support coordinate transformations. It should introduce as little further dependencies as possible. Preferably written in C++.
26484
I have a .tif file that contains all the elevation of a country.   How can I convert that to a CSV file that contains x,y,z values where x and y are the latitude longitude respectively and the z column is the elevation using QGIS?
74079
I am working with lithological data, where I have multiple z depths for one set of coordinates. How is this read by the raster interpolation toolset? Does it utilize only one or all of these z values?  If it does not recognize multiple values, is there a type of interpolation I can use that can?   My ultimate goal is to create something in ArcScene that has a 3D appearance and can demonstrate the profundity of a certain lithology.
121882
Do you know of a way to take surveyor's calls from an excel file (for example: N35-45-15W 60.0 ft, etc) and have them generate polygon shapefiles point by point in GIS? I know you can easily do this with point features that have coordinates, but I am trying to figure out how to build full polygons (without XY coordinate information, just surveyor's calls).
88471
I'm pretty new to using QGIS and I'm curious about how to import and export GPS points created in QGIS. I have QGIS 2.0.1 Dufour on Windows XP and a Garmin 62s. Any suggested walk throughs would be great.
77465
I'm a bit of a novice with QGIS, so this is really throwing me for a loop.  For the maps I'm intending on making, an azimuthal orthographic projection would be my preference.   For example, one map I'm trying to recreate is this map of the Pacific islands :    I've been using the NaturalEarth Quick Start package, which has been a really good launching-off point, but I'm running into some issues at the horizon of the orthographic projection.  I've tried adding a custom projection:  +proj=ortho +lat_0=0 +lon_0=170 +x_0=0 +y_0=0 +a=6371000 +b=6371000 +units=m +no_defs   But that gives the following map:    Which certainly is close to being right, but the ocean is obviously being cut off in the Arctic and on the southern horizon.  I understand the issue is that naively mapping layers described in WGS 84 to an orthographic projection leaves you with artifacts at the horizon, but how do I fix it?    I first tried to use the Clip to Hemisphere plugin described in , but it seems incompatible with QGIS 3; when I try adding the plugin, QGIS3 gives an error message and places it in the "Invalid" section of the Plugins window.    I then tried both solutions presented at  Again the issue is with QGIS 2/3 incompatibility.    For Solution 1, both Numerical Digitize and CAD Tools are again incompatible with QGIS 3 and give the same result as Clip to Hemisphere.    For Solution 2, I can't disable on-the-fly-reprojection in settings since that setting was removed in QGIS 3.
33644
[EDIT: In my original post, I had received an error that was based on a typo, so I scrapped that part of the question, but left the questions that still apply.]  In the  it says:  -nlt type: Define the geometry type for the created layer. One of NONE, GEOMETRY, POINT, LINESTRING, POLYGON, GEOMETRYCOLLECTION, MULTIPOINT, MULTIPOLYGON or MULTILINESTRING. Add "25D" to the name to get 2.5D versions.   Does this part: Add "25D" to the name to get 2.5D versions apply to both loading things into postgres as well as exporting data from postgres to .shp files?  Additionally, I am assuming 25D to meant that one can have a z value that corresponds to each pair of xy coordinates (as is the case with PolygonZ shapefile types), but that these coordinates may not overlap. Is this correct? What is the intended distinction in this case between 2.5D and 3D?  Thanks
122551
I have a list of surveyor points, and I will need to create a DEM model out of it ( in geotiff format if possible for space consideration, if not, then in ASCII grid format).  I need the DEM for watershed and catchment delineation purpose.   Instead of using existing software like ArcGIS, I want to write my code to do it ( in C++ or C#), so that I can later integrate them into my own GIS software. is there anything in GDAL or other open source tools that do this well? Or do I have to write from scratch?
116844
I have a polygon shapefile storing hexadecimal color codes in a specific attribute.    gid    |   label   |   color ---------+-----------+------------ 1        | Crops     | #FF5F2C 2        | Forest    | #00FF00 3        | Pond      | #0000FF 4        | Forest    | #00FF00   I was looking for a way to say QGIS to read these values in order to style the polygons with them. I can't find anything about this.   I hoped it would be possible without deeping into the Python Console (which still frightens me...).
63675
I have a system built on PostGIS/GeoServer/OpenLayers. Data (a ship's voyage track) is inserted into the database in real-time - a bunch of variables and point geometry type. This is served up via (primarily) WFS to OpenLayers.  I dynamically publish the layer for a new voyage using REST. When done this way, the bounding box (according to the config page) is set to 0,0,-1,-1 for both native and lat/long.  What I'd like to do is set this to a reasonable value programmatically - effectively automating going in and using the 'Compute from Data'/'Compute from Native Bounds' links on the layer config page.  My preference is to do this via a RESTful call, however this doesn't seem to be supported in the current version of the standard API. Any other alternative solutions are more than welcome.
78680
It seems there is no geoalgorithm to drop z values in the QGIS processing toolbox. Can this be done programmatically using the Python console? At the moment I have to save the layer with unchecked 'Include z-dimension' checkbox (non automatic geometry type):
78079
I'd like to use the DEM SRTM 1-arc second (Version 4, 30m) from USGS for Europe. Unfortunately there are some voids. My idea is to fill those voids using the void-filled version 3 (90m) by resampling it to 30m and inserting the missing data in the version 4 DEM.  As I'm new to QGIS I don't know the proper steps. I already got a 30m map by reprojecting the dimensions times three but I'm not sure if that's the right thing to do and I have no idea how to fill the voids afterwards.