QGIS is a user-friendly, cross-platform GIS application licensed under the GNU General Public License.

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2
votes
2answers
114 views

Do I need to remove older versions of QGIS?

I have installed up to 2.6.1 of QGIS on my computer. Is it recommended that i remove all older versions? Will it cause conflict if they remain?
2
votes
1answer
80 views

How to delete a double feature in QGIS?

I am working with QGis, and I have a layer that has some double features. I want to delete one of them, but not both of them. How can I do that easily?
3
votes
0answers
62 views

Why does field calculator compute area in square meters?

I am using EPSG:102748, and have set my Settings/Option preferred measurement units to ft. My CRS is NAD_1983_StatePlane_Washington_North_FIPS_4601_Feet, and when I use the measure tool, it returns ...
3
votes
1answer
53 views

How to connect lines with gaps to continuous line?

and I have a lot of this problem like in image. The two line are separated but i want a continuous line. What rule should I choose in Topology Checker? I want to know all the separated line, so i can ...
1
vote
0answers
17 views

how to generate metadata file for semi automatic classification plug in?

I am working on satellite images. The region I am interested in is only a fraction of the whole satellite images. My laptop slows down tremendously when working on the whole image. So I clipped the ...
1
vote
0answers
23 views

merge polygons of single feature QGIS

I am new to QGIS and have done some research on this topic before posting but not sure I found an answer. I have one feature that has multiple polygons (islands of a nation). In reality, there is ...
1
vote
0answers
25 views

Assigning values to vector grids using summary statistics QGIS

In QGIS, I have a 500 sqft grid overlaid onto my map. I want to perform summary statistics (sum, mean, median, max/min) on certain vector features under the grid and assign the grid cell that value. I ...
1
vote
2answers
80 views

How to batch process .txt files with X,Y data (in Arc or QGIS)?

I have a long list of .txt files that I need to convert to feature class. I can bring the table into ArcMap, right-click, Display X,Y Data, and it converts to a feature no problem. Is anyone aware ...
3
votes
1answer
45 views

What is the replacement for 'setColorShadingAlgorithm' in QGIS 2.6?

I have been struggling with setting the colorshadingalgorithm for a raster layer in QGIS with no success for the past few days. The QGIS cookbook seems to be pretty outdated. Anyways, the code that I ...
1
vote
1answer
22 views

WMS source, selecting and printing region on multiple pages

I am new with GIS software. I've imported topographic WMS source which shows whole country in ArcGis 10.2.2 and QGIS. I want to select one specific region and print it in narrow scale (say, 1:15 ...
-1
votes
0answers
35 views

To find buffer using python for a plugin

In my buffer plugin which i am creating, state is selected in a combo box , city is filtered based on the state selected in a other combobox. Distance value will be get from the lineedit box. After ...
1
vote
1answer
23 views

Getting a number from QLineEdit and passing it to the buffer function

I am developing a plugin which finds buffer. In that i am using lineedit for getting distance from the user and pass it to the buffer function. My current code throws an error "'QLineEdit' object has ...
0
votes
0answers
30 views

labels showing up as doubles

I have a problem in Qgis where all my labels are doubled on every single item (see image). I have checked the attributes list and everything seems normal. How do I show the labels properly?
1
vote
1answer
48 views

Qgis 2.7 (Dev) feature rotation?

Curious if the following code has a blatant error that has been overlooked with respect to rotating a single polygon feature. The *.geometry().rotate(...) returns a '0', indicating it was successful ...
2
votes
1answer
71 views

How does QGIS know there is a plugin update?

I've created a plugin and hosting the installation zip and xml file on a local network repository (for company use). Everything works fine but every time a user opens QGIS, it shows that the plugin ...
1
vote
1answer
19 views

How to add terrain information to an existing project in QGis 2.6? [closed]

I have created contour lines and a hillshade layers and saved it as a vector and as a GeoTiff file respectively. However, when I try to add these layers to an existing project, nothing shows up. Where ...
1
vote
1answer
44 views

Getting values from Qt widgets and using them for a buffer

I am writing a simple plugin that finds buffer. My gui has 2 combo box and 1 Line edit. The first combo box will have a drop down of values from column 'States' and 2nd combo will have a drop down of ...
1
vote
0answers
11 views

Creat clusters using long and lat

I have about 4000 stores all across the country. Based upon the long/lat distance and business level, I wish to create about 200 clusters who can manage 15-25 stores each. I wish to find out how to go ...
2
votes
1answer
78 views

GRASS GIS 7 in QGIS 2.6.1, Windows 7 64bit - Missing dependency

I am using QGIS Brighton 2.6.1. Today I have installed Grass GIS 7.0.0 RC2 to try its topology functions in QGIS. I have activated the provider, set the paths, but everytime I try to use any Grass ...
5
votes
0answers
57 views

Is it possible to generate a boustrophedon pattern which fill a vector Region with GRASS?

Every thing is in the title... I have a vector region in GRASS. And I would like to generate a vector (a polyline) beeing the bostrophedon pattern which fill this region. In the picture bellow, I ...
2
votes
1answer
64 views

How to move layers in the QGIS Table of Contents via PyQGIS?

I have loaded two layers in canvas and would like to move the layers using the following code in TOC, but it is not moving the layers to the position based on the index given. from PyQt4.QtCore ...
1
vote
1answer
22 views

if condition is false but output is true . what is the exact expression of greater than to bands value ('mjune@1'> 99.6:)

from qgis.core import * from qgis.gui import * from qgis.analysis import QgsRasterCalculator, QgsRasterCalculatorEntry from math import * from PyQt4.QtCore import QFileInfo import os from osgeo ...
1
vote
2answers
45 views

Copy a Group Layer QGIS

How would I copy a group layer in QGIS? I see that you can duplicate layers but copying a layer group is much quicker. What am I missing, is there a standard way, plugin, or python code to do this?
2
votes
0answers
39 views

How do I install a external package in QGIS?

Is it possible to install an external package in QGIS? For example: Can I install ReportLab in order to create a plugin to make pdf reports? Or Pandas. How can I install Pandas in QGIS Python ...
1
vote
2answers
29 views

Geoserver WMS defaults to Mollweide projection in QGIS

We have a WMS on Geoserver (version 2.6.1) which we are using to view in QGIS. For some reason when importing to QGIS it defaults to World Mollweide (EPSG:54009). The process is as follows: Add ...
2
votes
1answer
28 views

How to apply a filter to multiple vector layers in QGIS?

I am trying to apply an attribute filter to multiple layers in QGIS at once. The filter is to be applied to .osm data brought in through PostGIS to QGIS. I have tried selecting multiple layers -> ...
1
vote
0answers
25 views

In QGIS, how do I limit decimal places in data I imported as .CSV and joined to a shapefile? [duplicate]

I am importing a csv into QGIS 2.4 with a csvt file that specifies for percent columns Real(2.1) to limit it to 1 decimal place. It imports fine. When I join it to a shapefile, it looks fine. But when ...
3
votes
1answer
57 views

How to create non-overlapping intervals in the legend?

So I am trying to create a legend where the entries are, for example, like this: 1.1 - 2.0 2.1 - 3.0 3.1 - 4.0 as opposed to like this: 1.1 - 2.1 2.1 - 3.1 3.1 - 4.1 I essentially don't want ...
2
votes
0answers
18 views

Creating a distance overlay that is computed by the distance of points/lines and recalculated on zooming

I created a fictional map and visualized it with d3. Now I would like to show a scale/rule so that the user can see which distance (kilometers,meters) he is currently using. I was thinking about ...
1
vote
0answers
31 views

Embedding python to select feature in QGIS action

I am working from QGIS actions with python and want go to select the current feature that I've identified using the identify tool. (Key point is that there is a difference between identify and ...
1
vote
3answers
70 views

clipping an area out of multiple satellite images in QGIS

How can I clip the exact same area out of multiple satellite images ( multiple bands)? I am working on a remote sensing project and only need a certain island but the images show much more.
2
votes
2answers
57 views

focal mechanism(beach balls) for many Earthquakes

Is there a good way to automatically generate focal mechanism (beach balls) for a shapefile with about 30.000 earthquakes and store them ideally in the attribute table. It would be the best if I ...
1
vote
1answer
24 views

Edit existing Polygons to include several new nodes

I want to define catchments which are quite large from vector contour data. I normally start zoomed out to define the catchment generally as it is easier to see. I then zoom in and refine the ...
1
vote
2answers
69 views

Shapefile created in QGIS will not display properly in ArcGIS

I was asked to created a point shapefile of a cemetery. The points display correctly in QGIS but not in ArcGIS. I think the issue is with the coordinate system I created it in (WGS 84 / UTM zone 17N). ...
1
vote
1answer
21 views

How to combine depth and topography .asc file?

I have a .asc file produced from a hydraulic model. The .asc file contains depth data of flood inundation. I want to superpose the depth asc file with my topography .asc file so I can identify where ...
1
vote
1answer
43 views

Is there any statistical measure/tool that compares two different sets of location configurations in R or ArcGIS/QGIS?

Here is what I'd intend to do; I have a given set of facility locations as shown below; And based on a predefined one optimization criterion, I obtained the following configuration (and there are ...
1
vote
1answer
80 views

Adding field values to a QComboBox in PyQGIS

I have a layer say 'Cities'. There is a column called 'NAME_1' in the layer. My GUI has a QComboBox in which i want the values of column 'NAME_1' alone to be displayed in the drop down of the combo ...
1
vote
1answer
36 views

Buffering in km in NAD83 QGIS

I need to create a 32.1869 km (20 miles) buffer around my attributes, but the problem is the CRS needs to stay in NAD83. Is there a work around so I will be able to create buffers in km but still have ...
0
votes
1answer
26 views

Draw lake isobaths having depth points and coast line

For some lakes, I have a line shapefile representing the coast line and some points with many information, among which depth (in meters). Is there a way to draw an isobath linking every point with the ...
0
votes
0answers
13 views

I have an error when I execute a command in grass raplat

I use grass 6 in ubundu. I have putted the date into the .csv file and the antennas in .msi format, but when I try to execute the command in terminal "r.radcov" the system show me an error as: Error ...
1
vote
1answer
31 views

Loading multiple SpatiaLite layers into a single database

I have many SpatiaLite layers, each in a separate database. I want to load all these SpatiaLite layers into a single database. How can this be done?
2
votes
0answers
40 views

QGIS buffer polygon with different widths on each side

I create maps for wildfire risk assessments and am constantly asked to plot "defendable space" buffer zones around building envelopes that are different distances on different sides of the buildings. ...
1
vote
1answer
39 views

In QGIS how do I edit/save data which has no geometries?

In QGIS I can import data tables (CSV in particular) which have no inherent geometry (and no lat/lon columns) into QGIS. There doesn't seem to be any obvious way to manipulate that data (edit/save). ...
0
votes
0answers
22 views

Spatially joining 2 point layers i.e. pole and customer points using spatial join of PostGIS/PostgreSQL Without intersection and buffer technic

Intersecting customer points with pole feature with 20m buffer SELECT distinct h.gid, d.polecode as gid FROM customer as h LEFT JOIN pole_20 as d on ST_Intersects(d.the_geom, h.the_geom); ...
2
votes
1answer
26 views

Show “Raise Notice” and “Raise Warning” in QGIS

Is there a way to catch "Raise Warning" and "Raise Notice" (while editing PostGIS-Layers) from a PostgreSQL/PostGIS-Trigger-Function within QGIS? One example: I have a trigger that reacts to insert or ...
2
votes
3answers
51 views

Making empty parts of aerial imagery transparent

I have a raster file (ECW format) that covers a very large area, however the contents comprise a thin strip of aerial imagery (100m strip centered over the rail line). The bounding box for the image ...
1
vote
1answer
42 views

How do I properly import python sklearn to QGIS PyQt plugin?

A bit of background: I'm somewhat new to python and QGIS plugin development. I've created a plugin structure for QGIS using the Plugin Builder on QGIS and I've added some controls to the gui and ...
2
votes
2answers
61 views

How do you change the scale bar units to feet?

I'm trying to change the default QGIS scale bar from meters to feet. From the API documentation it looks like I should be able to use the QgsComposerScaleBar.applyDefaultSize() function. I thought ...
2
votes
2answers
58 views

How do I count the matching 'many' entries in a one-to-many relationship?

I have a simple SHP line file - where each line has a unique reference. I have a related text csv file using the same reference, in a one-to-many situation. I need a map with the lines (in the 'one' ...
1
vote
1answer
56 views

How to find chainage of points using LRS

I have a Shapefile of road that I have converted from a KML file (created on Google Earth) and a txt file containing lat long (from GPS) of points with some attributes. The points are not exactly on ...