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

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data source for worldwide cross-sections of topographic and bathymetric for woodworking art project?

i am a decent r programmer and statistician, i am able to work with data sets pretty well. i am less familiar with GIS tools, but if given a shapefile i can certainly plot political borders and ...
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1answer
136 views

How to work with Microstation DGN v8i files in QGIS?

I have a set of multiple files in DGN format (Microstation V8i). I would like to work with them in Qgis. Since QGIS only support pre-V8i dgn files, I cannot directly open the files. My first idea was ...
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1answer
83 views

Qgis 2.2 error plugin manager/installer error

I get this error at startup Ocurrió un error durante la ejecución del siguiente código: import pyplugin_installer Traceback (most recent call last): File "", line 1, in File ...
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1answer
21 views

Accuracy issues between data in QGIS and Google Earth

Wondering if anyone can answer this question. I have a kml in Google Earth. When I import it to QGIS, and then import the Google Earth images they are in slightly different places. I used a QGIS ...
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2answers
96 views

How can I see average of raster value over certain area, marked by mouse?

I have a raster in Quantum GIS and I am just exploring it. How can I see average of raster value over certain area, marked by mouse? In other words: How can I select particular area in QGIS? How can ...
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50 views

Is there a way to “zoom to feature” in QGIS?

I am the GIS Director of a city public works. I have a shapefile that I created of points on each structure and address in the city. We have been working in ArcMap Desktop for 6 or 7 years and depend ...
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1answer
13 views

Couldn't load SIP module (QGIS doesn't load Python)

I recently installed QGIS 2.4, but Python does not load. I am running on a Windows 64 bit machine. I receive the error message "Couldn't load SIP module Python support will be disabled". Traceback ...
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9 views

QGIS error when add WFS

I'm running QGIS 2.4.0-Chugiak on win7 64bit and am getting the following error while trying to add a wfs layer (using the simple Add WFS layer command): The layer ...
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7 views

QGIS/TileMill/Mapbox - How to downscale grid points or another solution?

Alright, I'm a web developer new to this field, I have the following issue I have built a python based tool that converts netcdf data to csv datetime|lat|long|value - it works great. Problem is the ...
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9 views

Qgis - Labels automatically resize to fit within the polygon

I wonder how to automatically resize labels of polygons so it can fit inside them and do not exceed their fronteriras nor be hidden
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1answer
29 views

Interpolation of xyz data

Data has been given to us in a HUGE .xyz file, which has been split into many component CSV files. When I upload the CSV file, then create the shape file by "save as", all is fine. When I go to ...
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7 views

Is it possible to leave a field null when using the calendar widget in QGIS?

I'm creating and editing data with QGIS, the data is stored in a Spatialite database but I've run into this issue with shapefiles as well. I have a field I'm storing dates in and I want to use QGIS' ...
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1answer
31 views

Join Attributes by Location: .mdb and shapefile in QGIS

I can join attributes by location in QGIS using 2 shapefiles. However, I do not know how to do the join when one of my files is in a .mdb format while the other is a shapefile.
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1answer
28 views

How to add labeling to a polygon layer?

I'm trying to add labeling to a polygons vector layer called "myVectorLayer". It does not give me an error but the labeling does not appear. palyr = QgsPalLayerSettings() ...
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15 views

How to move a layer in QGIS Toc above an existing group?

If in QGIS TOC a group already exists and I add a new layer via QgsVectorLayer* lyr= mQGisIface->addVectorLayer(uri->uri(),Title, myProviderName); the new layer will be inserted within the ...
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1answer
32 views

What is the inverse of QgsGeometry.asGeometryCollection() in qgis python?

What is the inverse operation of QgsGeometry.asGeometryCollection() as documented here: http://qgis.org/api/classQgsGeometry.html#a7cb1cbf8cfa441456067a66ad3a25a94 I'd like to do something like: ...
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1answer
82 views

How does one modify selected geometry with a function in qgis python console?

My example use-case is that I want to redistribute vertices along lines as in: Redistribute linestring vertices to specified distance How to create points in a specified distance along the line in ...
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10 views

QGIS strongly offsetted symbols for categorized layers not visible on layer list (layer panel)

I am constructing a symbology for telecom analysis, which so far is mainly point and line features. So far it is working very well except that I have to offset the symbols to be able to avoid ...
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1answer
24 views

Merge multiple linestring features into a single multilinestring

Using QGis or ogr2ogr how do I convert a vector file containing multiple linestrings features into a single multilinestring feature? At the moment I've been doing this manually by converting the data ...
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6 views

QGIS SimpleSymbolRenderer label for Symbol in Legend

Is there an ability to set a label for the symbol (in QgsSingleSymbolRendererV2) which is showing in the legend?
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2answers
301 views

How to avoid duplicate GIDs when copying features from one PostGIS layer to another?

When I enter new elements (features) in another Postgres layer, I can do it in two ways: Drawing new element(s) (with 'Add feature') which I do rarely or Copying (or cutting) some elements from ...
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16 views

Is it possible to rotate the geographic projection in QGIS?

I'm trying to create a Qgis plugin that can rotate a raster layer in the canvas so that the north is pointing at another direction. Unlike the thread below, I'm open to defining a custom projection. ...
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2answers
87 views

Properly clipping shapefiles in QGIS

I'm looking for help getting the correct shapefile. I'm working off of the files provided by the canadian government at ...
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20 views

Positioning and tracing polygons over an image

On QGIS 2.0 - I want to add an image (TIFF or whatever) then resize and correctly position it over a satellite image (openlayersplugin). Then, the task is to create a new shape file layer and draw ...
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1answer
989 views

Union, Dissolve, Buffer — multiple layers, all in one step?

I'm a new user of Quantum GIS (1.7.3) and I need to repeat a task multiple times, so I'm wondering if there is a quicker way to do the following (with three or more polygon layers - each layer has a ...
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2answers
99 views

How to copy attribute values of fields in selected features of one layer to another Qgis programmatically?

I am trying to get the values of attributes of the selected features of a layer field by field and copy to another layer that I created in qgis with pyqgis. Is here a example for this. Every example ...
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36 views

No tables listed in connection to MSSQL 2012 in QGIS

I've (finally) made a connection to my MSSQL 2012 database, but no tables are listed. Here's the tree view of the connection, and the connection properties: Some notes and questions: I've read ...
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1answer
30 views

QGIS: Need to remove unwanted white bands when raster layer are overlapping

In my project when raster layers are overlapping a white band appears the edge of the top layer. How can I remove it and obtain a seamless overlapping of the raster ? (I have try to built a vrt with ...
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1answer
198 views

How to set tolerance value of Geoprocessing tool in QGIS?

Is it possible to set tolerance value of geoprocessing tool on QGIS. History is below. There are two polygon which have to be the same position. so, I set topological rule "A must covered by B" on ...
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1answer
15 views

QGIS: how to identify a visible raster layer among large view (composition of rasters)?

I have QGIS project loaded with many raster files. For a given area, (ex: under my mouse pointer), I am looking for way to identify which (raster)layer provides the visible data. To start, I will ...
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22 views

QGIS 2.4.0 Chugiak “reduced” real-type numbers. Precision problem? Bug?

I have a SHP point file created from CSV with QGIS 2.4.0 Chugiak. It contains some data on noise in a certain point. When I import from CSV, it seems to be fine, but when I export to SHP and open the ...
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1answer
166 views

Extract one GPS fix per day from data?

I am in the fortunate position of having 2 years worth of animal movement data. With such a large amount of data I would like to extract only one fix per day to make it easier to work with. Data = 14 ...
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1answer
81 views

distance difference in Google Earth with exported GPX or KML compared to source shapefile

I've converted a shapefile (points) to KML with QGIS. Points in the shapefile are within 100m distance from each other. When I measure it in Google Earth, the distance changes to 80m. The same ...
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19 views

Creating random points [on hold]

I think I am just missing something simple but I am unable to get my random points to occur within my polygon boundary area using the random points tool in QGIS 2.4.0. I end up with my points up in ...
2
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1answer
15 views

QGIS, CRS's and metric measurements of distance matrix and nearest neighbour

I have thousands of points on a multiple layers and I need to get the distances between each point and every other point within a layer (so i can get min, max, mean and median distances) and the ...
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1answer
19 views

Set a Required Field in QGIS Edit Form

Is it possible to make a field required in a QGIS Edit Form?
2
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1answer
25 views

Programmatically setting ui for QGIS via setEditForm()

I've been following this thread in attempts to configure my ui preferences programmatically. I've had no issues with loading styles (which subsequently sets the custom ui if I saved it this way), but ...
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2answers
56 views

Incorrect display of national characters from Spatialite in QGIS, Windows

I used this tutorial by Underdark (thanks much :-) ) to convert my area of interest from OSM file (whole Czech Republic downloaded from Geofabrik.de server). Used OSGEO4W shell (saying "GDAL 1.11.0, ...
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2answers
559 views

QGIS, point clouds and photogrammetry

I'm trying to use photogrammetry and Structure from Motion to record buildings, and I'm looking for a way to bring these into a format usable in GIS, in particular pointclouds and models of terrain, ...
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2answers
9k views

How to convert ArcGIS .mxd file to QGIS .qgs file?

I recently tried to use QGIS and I wondered if you can convert a draft ArcGIS map (*.mxd file) into a QGIS project (*.qgs file). This would avoid thematize the entire project.
2
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1answer
200 views

Creating buffers that will not overlap in QGIS

I am dealing with a .shp with a number of points in it. The distances between points range from ~300m to 5km. I wish to create a 1 km buffer around each point with as little overlap as possible. Each ...
2
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0answers
55 views

Doubts with Ripley's K function Interpretation

I'm a self-taught person, I'm studying the K Ripley's function and I would need some person who give me some advices. First, I have written a little script of R in QGIS processor: ##Point pattern ...
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29 views

Rasterize shapefile using another raster's size and resultion

Rasterizing a vector (shp) I face the following problem: I want my output file (the rasterized vector) to have the same resolution and dimensions as an existing raster. If I understand the interface ...
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1answer
155 views

How to draw a custom map on top of base layer

I'm looking for the easiest way to draw a custom layer and export it as a tile cache. Basically what I would like to be able to do is load a base layer, and then draw objects and annotations on top ...
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1answer
15 views

Not empty geometry having blank text

i'm having problem with geometry column, for some rows i have geometry with blank text, this query will describe more the problem : select geom, ST_AsGeoJSON(geom), ST_Isvalid(geom), ST_IsEmpty(geom) ...
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1answer
30 views

Can FileGDB SDK be made to support custom coordinate systems?

In May 2012, a question was asked about File Geodatabase (*.gdb) support in QGIS? In the comments there, it was pointed out by @MattWilkie that the FileGDB SDK does not support custom coordinate ...
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2answers
42 views

How can I project a power line net in QGIS?

I am working with power lines net using the software QGIS. I would like to know which plugins or tools do I need to be able drawing (projecting) them.
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18 views

Some items have coordinates switched when loading PostGIS layers in QGIS

I am having problem with strange coordinates switching when loading PostGIS layers in QGIS. First, I thought, that problem may be cause by the use of GROUP_BY feature in layer query, but later the ...
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1answer
89 views

Import Shapefile on postgis doesn't show in QGIS

I'm currently working on a project about a database and some shapefiles. The database is built on PostGis with tables including some dots as geometry type columns. Once imported them on QGIS, I can ...
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1answer
85 views

How can I add grid lines to a print composition using pyqgis?

I'm writing a qgis plugin to create an image in the print composer of the current map. I can get the map rendered in the proper place with a frame of the right width, and I can get grid annotations ...