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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0answers
62 views

Can we create buffer analysis using python in qgis?

Can we create a buffer of distance 0.004 using python in qgis. I tried this link, but it isn't working for python in qgis 2.10.1-Pisa. The above is the diagram of buffer I am asking. It's located ...
1
vote
2answers
59 views

How do I generate an image of each polygon in a shape file? [closed]

I have shapefiles containing areas (states, counties, bodies of water, etc.) and need to generate an image (png / jpg) of each area. How can I do this? In my mind, the manual workflow would be: ...
2
votes
1answer
34 views

QGIS Reprojecting csv point file to projected CRS

This is a problem I have been struggling with quite a bit and so far have not found a good solution, so I hope to find some help here or an eyeopener where I have gone wrong so far. Using QGIS 2.10.1 ...
0
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0answers
5 views

qgis print composer fails on Mac (Mavericks)

For the last few versions of qgis, including the current 2.10, I have been unable to use the Print Composer to output maps. After choosing Print Composer from the menu, a tiny window pops up, with ...
1
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0answers
16 views

QGIS Heatmap Plug: Filling a radius with one color

I'm using the heat map plug in and I want to fill in my circles with just one color that corresponds with a specific color along a gradient. My tinkering has not been fruitful and every tutorial I've ...
0
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0answers
17 views

Is QGIS Server working like this?

On CentOS 7 I have QGIS Server and QGIS Desktop installed. In QGIS Desktop I created a project with raster and vector data and saved it in a ".qgs" file. Then I copied the file in ...
2
votes
1answer
21 views

QGIS GRASS raster to GeoTiff

First of all: Windows 8.1 QGIS 2.8.2 Wien My problem is that I used the GRASS module r.watershed to delineate watersheds and get flows with a DEM. It worked fine so everything is OK so far. But ...
1
vote
1answer
25 views

How to merge(transfer) one layer into another postgis layer?

I want to merge 2 layer which have identical structure. First layer is from postgres database table say "layer1" and other layer is shapefile say "layer2". I want to merge layer2 "INTO" layer1 (NOT ...
3
votes
1answer
43 views

CRS does not match after upgrade to QGIS 2.2

QGIS project, which was saved in 2.0 has defined CRS for project as a whole and for each of the layers. When I open the project in QGIS 2.2 and higher, one of the layers is shifted and does not match ...
2
votes
1answer
110 views

Copy first row of attributes and paste for each feature

In a newly digitised polyline vector layer, there are 7 columns attributes value that are choosen inside a value map combo-box that MUST be exactly the same for every newly digitised line (I choose ...
1
vote
1answer
36 views

pyQgis - set Variables on startup

via startup.py it is possible to execute python code when qgis starts. Now I wonder, whether it is possible to set variable values, eg. a string variable which holds a path or a dictionary of values, ...
2
votes
1answer
26 views

Reducing data on vector layer in QGIS

I use QGIS for GIS. Lately I had just too many points appearing on my vector layer and I will want to reduce them (100 for a given scale : min-1 and max 9000). With labels it works quite well but how ...
3
votes
1answer
36 views

QGIS auto backup… is there one I can set?

I see QGIS makes a backup of the last manually saved project. But how about a timed interval that automatically makes backups as I work. Just had a QGIS crash dump, lost lot's of work. Can't save ...
6
votes
2answers
96 views

How to bulk import gpx files to QGIS and merge into a single shapefile?

I am looking to create my own 'heatmap' of all the bike rides I have recorded using the app Strava in QGIS. I have over 450 individual gpx files and would like to merge the track points layers into ...
0
votes
0answers
18 views

Qgis2Web wfs data doesn't show

Hi i've eneabled the plugin qgis2web. after getting one WFS-layer in de QGIS I started the gis2web plugin. Because it is a wfs-layer and i want leaflet to use that wfs i don't check the Encode to JSON ...
5
votes
1answer
94 views

How to exit QGIS after running a python script?

I would like to run a python script via qgis --code myscript.py and then immediately exit. I'm using iface.actionExit().trigger(), which kills QGIS when I run it from the python console, but not when ...
0
votes
1answer
22 views

Can't access GRASS tools in QGIS [duplicate]

I'm running QGIS 2.6 on OSGeo-Live 8.4 Virtual Machine based on Lubuntu 14.04. I've set up a GRASS (GRASS GIS 7) environment in QGIS, and I have a merged .tif file of LiDAR images open in QGIS, so I ...
1
vote
1answer
22 views

Unable to update some of the attributes using PyQGIS

I'm trying to create new attribute and populate it, but for unknown reason some of the features does not update while others are updated normally. # scores - list of values which length is equal to ...
0
votes
0answers
13 views

How to refine a gpx track and set additional points on existing road network?

I am trying to refine/populate gpx tracks recorded by a GPS device. I would like to add 1 or 2 points between each gpx point recorded and snap these additional points to roads. I am using essentially ...
2
votes
0answers
30 views

Using Terrain Profile plugin with an interpolated raster

I am very new to QGIS and the goal of this exercise is to view an elevation profile of a river from a set of discrete points taken from surveying records. Steps taken: A vector layer was created ...
2
votes
0answers
24 views

Prevent polygon feature (catchment) overlap for land-use extraction using QGIS?

My aim is to calculate catchments for around 150 points and to extract land-use variables for them. In order to do so I need a vector dataset where no polygons overlap. This, however, seems to be a ...
2
votes
3answers
51 views

How to find the extent of (many) EPSG CRSes?

I want to map the geographic extents / bounding boxes of a lot of EPSG CRSes. At least, those with a rectangular geographic extent. For example, take epsg:2004, visiting that page shows the extent ...
2
votes
1answer
56 views

How to group points in QGIS?

I need to group 400 points in 10 groups with 40 points each. The goal is to get the 40 points geographicly together like this: Any idea how to do this with Qgis Pisa?
0
votes
1answer
30 views

How to save layer as dbf using pyQGIS?

Is it possible to save layer as dbf? Or even better convert .csv to .dbf? I have some .csv files, no geometry just attributes and I need it as .dbf as I want to edit them (I found that Qgis doesn't ...
1
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2answers
19 views

Project file read error: Unexpected end of file at line 9957 column 1

On reading the answers from a similar question earlier i still cannot retrieve my project. I last used this project in June and obviously something went wrong when saving or creating the new layer ...
1
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1answer
13 views

How to add a point in a empty vetorLayer creadted in memory

I am working in c++/qt 4.5 and qgis api c++ 2.8.2 I had to create and empty vectorLayer and add Point I saw in the qgis cookbook that it is possible to create a vector layer in memory ,I did that, and ...
1
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0answers
20 views

Clip Categorized Polygon with another Polygon

Ok, so first off, I've gone through the forum, and looked at every post that sounds similar. They have all been solved, but none of the solutions have worked for me. Basically, I have created a ...
1
vote
1answer
21 views

Qtiles won't work with Range Scale?

I am using QGIS with QTiles plugins. It was working perfectly, until I use Scale Range within my style. When I do so, the Scaled Range layer is not printed at all on the generated png. Do you know ...
1
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0answers
24 views

How to load and execute python scripts from a local path after python console is triggered in QGIS?

I had created a file named "startup.py" in users python home directory (... .qgis2/python) and i had triggered the python console in startup.py file by import qgis ...
0
votes
0answers
12 views

Problem in export as a imagefeat in QGIS print composer [duplicate]

I am trying to overlay the sluice map with background of google satellite. Everything working fine when I do it in Print composer. But when I export as a image, the whole map gets shifted and it is ...
0
votes
1answer
11 views

How to use SpatialOperator in filter expression in QGIS

In a python script I want to specify a request filter expression using a spatial operator. I am following the general syntax "field name" operator condition. For example: ...
1
vote
0answers
15 views

How can I check If Features do not have an SRID set or are similarly malformed? [duplicate]

QGIS does not display all Features of Layer and behaves weird instead I got the comment: "How did you create the other features in PostGIS (as opposed to the ones that were edited)? My initial ...
1
vote
1answer
31 views

Why is the heatmap color not showing in TileMill?

I created a heatmap on QGIS (2.8) and styled it using singleband pseudocolor. I want to turn it into map tiles, so I added the TIFF as a layer in TileMill. However, when it's in TileMill, it loses ...
1
vote
1answer
65 views

QGIS corrupting shapefiles?

I'm hoping someone out there might be able to help or suggest some tests to try and resolve some very odd QGIS behaviour of late... Our core GIS team of 4 users has been testing v2.10 prior to ...
1
vote
1answer
37 views

Autocad DXF to Qgis and exporting to KML for viewing in Google Maps

/ Background: I have a DWG trace made in AutoCad using Gauss-Kruger coordinate system ( a CRS used in Slovenia ). I'm using AutoDesk Map 3D to transform the coordinate system to WGS84.PseudoMercator ...
1
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0answers
43 views

Use cython in QGIS?

I've wondered for some time how to use Cython in QGIS. I know I can integrate a Cython code in python, but I want Cython to handle QGIS classes. QGIS is built upon QT, every qgis object is a qobject ...
0
votes
0answers
30 views

Error's while retrieving data from postgres to Qgis using python?

This is my code of python in qgis from qgis documentation docs uri = QgsDataSourceURI() uri.setConnection("localhost","5432","gis_data","postgres","vajja") ...
2
votes
1answer
69 views

QGIS 2.10 with ubuntugis dependecies Grass issues Ubuntu 14.04

I saw in How to correctly install QGIS 2.8.3 with GRASS plugin on Ubuntu 14.04? how to get Qgis 2.10 running from the non ubuntugis repository with grass features but I'm still having problems with ...
1
vote
1answer
21 views

Creating a new layer from a spreadsheet and an existing shape file in QGIS

I have a map of US zip codes and a spreadsheet that associates data with specific zip codes. I want to show the zip codes where the most data exists using a gradient, but I am not even sure how to get ...
0
votes
0answers
28 views

GIS route creation from street names

I have a list of streets comprising 300+ routes. Each route (in text) lists 4-5 street names where the route should take place. I would like to create each route, that is, plot the street names and ...
1
vote
2answers
26 views

Combining several mask rasters to obtain one single mask with binary values

I have a series of separate rasters which represent the cloud cover over the same area but in different months. Each raster has 2 values: nan for "no cloud" and 255 for "cloud". What i want to do is ...
1
vote
1answer
40 views

PostGIS Query returns duplicated rows

I'm trying to create a shape file of a state. I have a map of US zipcodes that I downloaded from the US Census and I want do create a shapefile of zipcodes in Florida. I ran this query which ...
1
vote
1answer
26 views

Cartogram not working: “Cancelled by user” - Why?

I am using the QGIS Cartogram plugin, but unfortunately something is not working as it should. First, the demo works just fine. But when I want to create a cartogram with my own layer. But as soon ...
0
votes
1answer
53 views

QGIS 2.10.1-Pisa [duplicate]

Since the version QGIS 2.8, each time I start to open it it begin wth this error message. I have Mac OS X 10.7.5 MacBook Pro, late 2011. It works but what do it means, and what should I do, I install ...
2
votes
1answer
20 views

Is it possible to open WMC(Web map Context) file in QGIS?

I am new to WMC and in our application we had a requirement to extend the WMC functions. For that I need to know whether QGIS have the support of WMC files. Or we need any plugins for WMC support ...
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0answers
31 views

Qgis delimited text layer from an excel file converted to .csv

I'm trying to add a delimited text layer using coordinates. The file has been created in excel and then converted to a csv file in the saving. When I put it into Qgis it doesn't recognise the ...
1
vote
2answers
108 views

Exporting .csv file as .shp in QGIS?

I am a newbie to QGIS. Here's what I'm trying to achieve: Step 1: Load the required GIS layer (*.shp file) Step 2: Load the .csv file in QGIS Step 3: Perform the join based on common attributes ...
0
votes
1answer
15 views

Error while displaying qgis project via qgis2leaf plugin?

couldn't see the map on the browser while using QGIS2LEAF Plugin in QGIS 2.10 Pisa. It gives error on web page saying: error at line 8: L is undefined. Please let me know if anyone knows the ...
1
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0answers
25 views

Is it possible to interact with a running instance of QGIS from the command line?

I just started looking at QGIS on MacOSX. I installed the MacPorts package and found the executable: /Applications/MacPorts/QGIS.app/Contents/MacOS/QGIS* Unfortunately it appears that the command ...
1
vote
1answer
57 views

pixel values beyond valid range in QGIS

I opened a sub-dataset of an HDF file (NDVI layer of MODIS HDF file) in QGIS, but pixel values are beyond the valid range (-2000,10000). I see many pixels way less than -2000 and way over than 10000. ...