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

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2
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20 views

QGIS extremely slow to clip vrt on Mac

I've been using QGIS 2.6 (Brighton) happily for awhile but suddenly it became extremely slow during certain operations, after being reasonably fast in past use. I'm merging NAIP JP2 files to virtual ...
1
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0answers
22 views

Inflating the boundaries created with convex hull

I have a set of lan and lat points and have plotterd a convex hull for them using QGIS. A polygon is created along the set of points and plotting them on the MAP. Now I am trying to inflate the size ...
1
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2answers
27 views

QGIS dividing a raster by a polygons layer

I've got a raster image and I want to divide that raster by a polygon layer. There are just 7 polygons in the layer so i need to obtain 7 raster images as output. How can this done in QGIS?
1
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1answer
38 views

How to compute buffers for certain features?

I used the following snippet of codes for finding buffer. def buffer(self): layer = self.iface.activeLayer() distance = float( self.dlg.DistancelineEdit.text() ) city = ...
0
votes
1answer
27 views

How to connect mouseclick to map canvas in QGIS?

How to connect mouse click to map canvas in QGIS using python script? I have two lines of code to connect mouse click to map canvas: button.clicked.connect(self.onClicked) ...
1
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1answer
35 views

QGIS/OpenLayers - How to add a “labels-only” reference layer (basemap focused on labels)?

In ArcGIS you can add a "reference basemap" which features labels for key locations as in: http://www.arcgis.com/home/item.html?id=8b3d38c0819547faa83f7b7aca80bd76 however, in QGIS, I cant figure ...
2
votes
1answer
35 views

How to visualize car park occupancy over time?

I am using QGIS Brighton 2.6.1. I have a csv table with the exact entrance datetime and exact exit datetime of every car in an specific parking. Example of table: Nº DateTimeEntrance ...
3
votes
1answer
68 views

How to import fromUtf8 in QGIS?

# Declare instance attributes self.actions = [] self.menu = self.tr(u'&City_searcher_plugin') # TODO: We are going to let the user set this up in a future iteration self.toolbar = ...
0
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0answers
19 views

How to update Trackball controls at three js

I have a project at three.js created from qgis to threejs export where i need to update the trackball controls on window resize.. I need to do that updating the whole controls calling the function ...
0
votes
1answer
21 views

Keeping no data values in clipped rasters

I am using QGIS and I have a raster layer with temperature values. The ocean has "no data" values, since I need only terrestrial information. I need to clip this image to retain only one part of the ...
1
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0answers
16 views

creating composite raster tiles from multiple vector layers as new background map in QGIS

I have been patiently restyling OS Vectormap product to create a map background I'm happy with, which i want to now use as a background for a leaflet map using QGIS2leaf. I understand that performace ...
1
vote
1answer
49 views

Determining Projection using QGIS?

I am very new to QGIS and I am trying to determine the spatial projection and the units of distance of a certain raster file. The closest thing I can find is the CRS, which is set to some sort of ...
1
vote
1answer
40 views

convert vector (point shape) to raster (tif) using python gdal lib in qgis

I'm trying to convert a vectorlayer (point- shapefile) to a raster-dataset (tiff) using python gdal-library in qgis. On Graphical UserInterface I simple choose the menue ...
0
votes
1answer
43 views

How to trigger a QGIS action when a plugin button is clicked?

I tried calling the select free hand tool by below snippet of code. iface.actionSelectFreehand().trigger() I dnt have any idea how to call this when i am pressing a button in GUI. my gui is ...
0
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0answers
25 views

Error in my buffer plugin

In my buffer plugin, i tried the following code # Get buffer distance and selected city dist = float( myLineEdit.text() ) city = myComboBo.currentText() # Get the feature corresponding to the ...
1
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0answers
31 views

Which version of the Oracle Client do i need to get Oracle support in QGIS 2.6.1?

I have just installed QGIS 2.6.1 and wish to connect to our Oracle Spatial 11g Database. Am I correct in thinking I will need the Oracle Client installed on my machine for this to work? If so which ...
2
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0answers
40 views

Is there a way to (helpfully) give feedback on QGIS Training Manual?

I'm just working my way through some of the current QGIS Training Manual: http://docs.qgis.org/2.6/en/docs/training_manual/ As I work through it I am coming across occasional things which are ...
2
votes
1answer
31 views

Problem with creating a model in Qgis — select by location

I have two shapefiles (polygones) - referentiebestand and oudejaren -> the first step is to calculate the centroids of each shapefile (gives a good result), then a create a buffer around one of this ...
1
vote
1answer
48 views

How to call default tool in QGIS inside plugin using python script?

I want to create a plugin which can draw irregular polygons in QGIS. For that, I want to call the Select features by freehand default tool inside my plugin. How can I do this within a python script?
1
vote
1answer
55 views

How to connect Excel file with QGIS?

I am working with QGIS and I want to connect with Excel. I have exported attribute tables to Excel. Now I want to connect Excel with QGIS in the way that if I change a line dimension, it will be ...
1
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0answers
21 views

How to highlight joined features?

I have a task in QGIS (2.6), where I need to join two tables through an action (I think). I have some projects (points) that I need to connect to a list of partners (also points). I have data in both ...
0
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0answers
22 views

Mask plugin, Atlas composer and Legend

I'm tryin' to use the mask plugin associated with atlas composer (QGIS 2.7 dev). I'd like to have in the legend of map composer only the features that belong to mask instance (inside the mask). if I ...
1
vote
1answer
37 views

Split polygon into several smaller polygons in QGIS

I have a layer of polygons depicting response boundaries, I would like to break each of these polygons into a number of sub-polygons. As this is for an exploratory project, the polygons themselves ...
0
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0answers
14 views

Export DXF Issue in QGIS?

I got the shapefiles in QGIS and transformed them to UTM NAD83 from WGS84, then tried to create a DXF of it so I could use it as an overlay in fieldgenius software for a topographic survey we're ...
1
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1answer
28 views

QGIS (2.6.1) Processing Toolbox InitGui error after changing /Users folder on Mac OSX

Using: Mac OSX 10.9.4 QGIS 2.6.1 I had previously installed QGIS and had everything running fine. My home directory was /Users/rowanbado, but for another application I had to add an ...
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0answers
22 views

Why are MySQL network connections extremely slow in QGIS 2.0 - 2.6 (when compared to QGIS 1.8)

In our project we have been using QGIS 1.8 Lisboa with a MySQL database placed on a server accessed via local network since two years. Everything is working fine and quick. The vector layers can be ...
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0answers
25 views

Network Analysis for Pickup and Dropoff

I have a bit of a problem that I need help with. I am looking at a set of lat/long with a time stamp for the desired pickup or drop-off for passengers. There are multiple pick-ups and drop-offs within ...
2
votes
2answers
46 views

Is it possible to set up a local QGIS Plugin repository?

I've developed a couple of custom QGIS Plugins for use by our office. I can't post them to the official QGIS Plugins repository as they reference/utilize sensitive data on our own servers. For ...
0
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0answers
24 views

QGIS How to multiply (repeat n times) a point by field

I have a point layer in QGIS that has a field named "Amount" that stores an integer value for every point in the layer. I want to create N points in the exact place of the feature that has N as ...
1
vote
1answer
88 views

print composer and atlas feature on large dataset

this question could be very complicated, so I'll try to be as clear as I can. I have a polygon (hundreds of cells) that has a quite rich attribute table (more than 30 fields). Each field contains ...
0
votes
2answers
21 views

Is there a list of free application modules (or “Fachschalen”, in German) for QGIS somewhere?

I'm looking for application modules (in the form of plugins) that cover sets of related tasks like asset management, in a basic UI. A simple use case example: a water gauge (point feature with a 1:n ...
1
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0answers
21 views

Run C++ standalone application in debug mode

I write simple C++ standalone application using QGIS. It works and render vector layers from PostgeSQL database. #define CORE_EXPORT __declspec(dllimport) #define GUI_EXPORT __declspec(dllimport) ...
1
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2answers
95 views

How to export attribute table to Excel from QGIS?

I have seen all the questions for this question, and I try all the answer like copy paste, csv (in fact this I don't know where to find) but none of all is not the right answer. Can anyone help me?
0
votes
1answer
29 views

How to enable the snapping for a layer with the tolerance value with python programming

I have a vector polygon and vector polyline layer. I want to enable the snapping for both the layer with tolerance value? How can i do that using python programming. I have tried this code but getting ...
2
votes
1answer
36 views

Create a grid with statistics of the merged shapefiles in QGIS

I operate with QGIS. I have to split the shape files of the buildings and the roads of a city into a grid of 500x500m per square and into each square I have to obtain the total free area, the total ...
0
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0answers
16 views

How to project the geographic grid in a shapefile in QGIS

Is it possible to automatically project the geographic grid (View -> Decorations -> Grid) into a shapefile layer in QGIS?
2
votes
1answer
56 views

How to save the Map Canvas as PNG with transparent background programmatically?

I wrote a script to create a big number of heatmaps for a given scenario. I would like to save the result of every heatmap as a png image. I have figuered it out doing it with simple Map Rendering but ...
1
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0answers
22 views

QGIS 2.6 SAGA Processing Algorithm, “Add grid values to shapes”, produces NULL Values

I'm using QGIS 2.6 Brighton on Windows with SAGA 2.0.8 installed using OSGeo4W. I have the same versions installed on OSX as well which is not having this problem. On Windows, I'm trying to extract ...
0
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0answers
49 views

Getting coordinates from random directions

This is an odd question, but was wanting to know if there was a way to get coordinates from random directions. I have about 2000 directions in a spreadsheet column. There is name and a few other ...
0
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0answers
53 views

Line length for line files

Using QGIS, Brighton 2.6. Trying to calculate line-lengths for linear features (roads, trails, fenceline) and used this post (How to find line length in QGIS while editing?) and the links associated ...
1
vote
1answer
24 views

How to display symbols on a Raster in QGIS?

I have a raster file in which each cell has a numeric code which indicates that the cell is directed towards one of its eight neighbours. I am using QGIS to display each of the eight possible codes ...
0
votes
1answer
27 views

Projection issues with merging files. [duplicate]

New QGIS user, 2.6 Brighton. My project CRS is default to Nad83ft / N.Carolina (US). I loaded various polygon and line (provided to me) that have various CRS's but they still show correctly in place ...
2
votes
1answer
28 views

QGIS gets stuck when running script to automatically refresh layer [closed]

I have a QGIS layer that represents a set of links and nodes to show the streets of a city and the traffic speeds on each street. I've been trying to write a script so that if I change the speeds in ...
0
votes
0answers
24 views

Why is the display of QgsMessageBar delayed?

When a function is called - a file is tested for existence. This checksum pushes a messageBar() object for both circumstances (True/False), yet the actual bar does not display in MapCanvas until ...
1
vote
1answer
43 views

How to exclude a certain attribute from being added to the Processing script output layer?

I have a working script to split a layer by field attributes and save the single features as files: ##[User scripts]=group ##input=vector ##class_field=field input ##output=output file from ...
0
votes
1answer
34 views

How to construct semi-circle-shaped areas of confidence?

We have polygon maps of river-bottom type and are interested in determining if particular bottom-feeding fish prefer one bottom type over another. We locate an acoustically tagged fish at a point in ...
1
vote
1answer
46 views

How to remove a parcel from a larger area?

New QGIS user here. I'm trying to clip a large (2000-ac) property boundary with a smaller (500+/-) acre property. Assuming the larger boundary is the input layer and smaller is the clip layer, my ...
0
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0answers
47 views

Couldn't load plugin processing in QGIS: Access is denied for R

Couldn't load processing plugin due to flowing error. Any help? thanks. Couldn't load plugin processing due an error when calling its initGui() method Traceback (most recent call last): File ...
1
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0answers
25 views

Hydrological triangle (geoscience) with QGIS 2.6.1

I want to interpolate ( TIN-Interpolation) between variable points (the best within a triangle) WITHOUT producing new shapefiles (or csv data file). So what I have now is an interpolation of all ...
0
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0answers
39 views

Is there any way to create user login for single project in QGIS?

Is there any way to create user login for single project in QGIS? I want to track changes on database when users update features. I know that I can do this on database level but is there way to do ...