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

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1answer
316 views

How to calculate distance to polygon edge to compute building setbacks?

I'm trying to calculate building setbacks using building footprint data. A building setback is the distance between a building and the edge of the lot line. (You can distinguish this further—garage ...
2
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1answer
2k views

Can QGIS or GRASS convert layer files to shapefiles?

Should I be downloading QGIS or GRASS? I want the program with the most features. Most importantly, I have a lot of .lyr files. Can either of these softwares convert to shp and if so, how can I do ...
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1answer
155 views

Tools for map animations

I am preparing some visualizations of data (mainly animated choropleths), and I am looking for suitable tools. Ideally, I am looking for something similar to this kind of animated infographics. So, I ...
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0answers
298 views

How to show elevation on mouse hover in QGIS?

I've got a DEM layer and would like to have the status panel in the bottom display the elevation in addition to the mouse coordinate. Can that be done? Using QGIS 2.6.1
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138 views

Polygon vertex “duplication” in QGIS?

New QGIS user, Brighton 2.5. When creating or moving new vertex points of a recently-cut polygon (hence adjacent polygons) I get "duplicate" or "criss-crossed" lines beneath the former vertex ...
4
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1answer
778 views

How to match a raster NetCDF data with a vector layer in QGIS?

When I load a raster layer with humidity data from NOAA database (for instance rhum.2m.2014.nc at ftp://ftp.cdc.noaa.gov/Datasets/NARR/Dailies/monolevel/) I am not able to match it with a simple map ...
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1answer
47 views

How to access layer in QGIS?

I want to get QGIS to update from a CSV file like in this How to update data from external table in real time? question, however I can't figure out what to put for "myLayer". How can I define the ...
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0answers
131 views

Polygon Layer Cleaning with QGIS

I have a little situation with my data. I have vectorized a raster layer, and now I have some issues with the geometries, as you can see in the picture. Most of errors I have are like this one. ...
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1answer
67 views

How to find length attribute form my all lines in my layer

I am a begginer for QGIS I have a column for the length of the lines, but don't know how to find it. Can anyone help me?
2
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1answer
220 views

How to unlock imported GeoJSON vector layer?

I have a map on geojson.io, with some fails that I need to correct. It has a feature to edit polygon's node but it's too tedious and hasn't "snapping" mode. So I've imported my .geoJSON, .shp, ....
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0answers
60 views

How to export only labels as svg in QGIS 2.6?

I'm working with a big big data set in QGIS 2.6 (but also in QGIS 2.7). I have many line layers styled with the rule rendering tool. What I want to do is to export only the labels of all these line ...
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0answers
102 views

What's the best way to convert points to raster and back again?

To convert raster grids to vector points In QGIS there we have different possibilities (grass tool "to.vect"; saga tools "grid values to points"). My problem is a little bit complicated. In the ...
3
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2answers
662 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
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1answer
199 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?
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0answers
351 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
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1answer
213 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
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1answer
114 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 ...
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0answers
95 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 ...
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0answers
156 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 ...
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2answers
681 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
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1answer
131 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 ...
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1answer
34 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 ...
2
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1answer
479 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 ...
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0answers
43 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?
2
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1answer
121 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
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1answer
115 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 ...
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1answer
21 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 ...
2
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1answer
207 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 ...
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0answers
15 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 ...
3
votes
1answer
724 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 ...
18
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1answer
302 views

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

Is it possible to generate a boustrophedon pattern which fill a vector Region with GRASS? I have a vector region in GRASS. And I would like to generate a vector (a polyline) being the bostrophedon ...
2
votes
1answer
560 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 ...
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1answer
51 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 ...
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2answers
124 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
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0answers
243 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 library?...
2
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2answers
113 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
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1answer
582 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 -> ...
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0answers
30 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 ...
4
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1answer
113 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 ...
3
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0answers
29 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 ...
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0answers
158 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 select)...
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3answers
104 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
3answers
819 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 ...
4
votes
1answer
854 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 ...
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2answers
150 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). ...
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1answer
111 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 ...
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1answer
56 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 ...
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1answer
455 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 ...
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1answer
92 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 ...
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1answer
128 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 ...