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

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6 views

Grass toolbar for QGIS 2.10

I don't see the GRASS toolbar in QGIS 2.10 (Pisa). There are still GRASS commands in the Processing toolbox. I know there was some upgrade of GRASS for 2.10. Is the toolbar not available anymore? If ...
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16 views

Loading Natural Earth *.prj file into QGIS 2.10.1?

I have found solutions for this problem in other versions of QGIS, but none that apply to the newest version 2.10.1. Whenever I try to import a Natural Earth Raster projection that is a prj file I get ...
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0answers
10 views

QGIS.How to load a style from POSTGIS in PyQt

The thing is that I have four styles I have created in QGIS trough the GUI and saved into a postgresql database. I can see them in the table named layer_styles I have seen similar questions asking ...
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2answers
14 views

How to put a frame around a legend using QgsComposerLegend?

I can already see this being a simple answer but I'm stumped with this. I want to create a frame around a legend created by a PyQGIS script Code snippet is: legend = QgsComposerLegend(c) ...
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1answer
18 views

How can I check in QGIS python if an atrribute is included in my layer?

I use the following code: for field in self.layer.pendingFields(): if field.name()=='elevation': do this else: do that Although there is an elevation attribute in my layer ...
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1answer
21 views

what is the “clip” feature for color ramps?

In the singleband pseudocolor band rendering, there is a boolean checkbox "clip". What does this do? I don't notice a difference in my maps and haven't found documentation for it. Thanks
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0answers
12 views

QGIS 2.10.1: Unable to stylize as pseudocolor render type

In a raster layer's Style Properties, I can choose pseudocolor render type, and choose a color ramp and classify the raster. However, when I click the 'Apply' button, or click 'OK', the ...
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0answers
11 views

Updating a column in MapInfo based on Symbology or colour

I am transferring a large dataset from MapInfo (V 12.0.2) to QGIS (V2.8.1) and I want to be able to create a column in the MapInfo attribute table that differentiates features with different ...
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0answers
12 views

Problem using EPSG:3395

in my application I use OGC:CRS83 for the coordinatereferencesystem, but now I had to change it to EPSG:3395 when I call : mQgsCoordinate->createFromOgcWmsCrs("EPSG:3395") there is nothing in ...
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0answers
41 views

Create Indexes Within a View? How could I Speed up Spatial Queries Over a View?

I´m trying to add a view from postgis using QGIS, what´s facile. The problem is that it´s taking too long to load it and to perform any kind of operation, for example, as simple as counting rows. It´s ...
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0answers
8 views

Unable to make qgis build in cmake

I am trying to build qgis without any change in source code which i have downloaded from github using clone and i have download OSGEO4W from qgis.org and the same is installed in c drive. I have ...
2
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1answer
18 views

QGIS: Finding electric network loops

With QGIS, how can we analyse an electrical network to find loops? Using Python is not a problem, however there is not a solution in the QGIS Python API. The QgsGraphAnalyzer has dijkstra and ...
2
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1answer
19 views

QuickOSM returns no result

I am trying to download the polygons for the Umweltzone Heidelberg from OpenStreetMap using QuickOSM in QGIS. I queried by name as shown in the screenshot: The corresponding OSM script looks like ...
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0answers
17 views

Error in Editing Point Shapefile: I can't add a new point feature

I want to add a point to a point shapefile. I place the cursor in an empty field. The strange thing is that the point of the point shapefile that is nearest to the cursor is highlighted. If I click ...
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4answers
203 views

Is there a quick way to clear all attributes from a layer but leave the polygons in place?

I have a layer with several polygons, each of which has data in over 100 fields. I need to create a new layer with all the same polygons, but with all their data fields blank (set to 0, Null or empty ...
2
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0answers
25 views

How to rename field names in a shapefile attribute table without table manager using python

By using the table manager we can rename the field names but i want to rename of fields using python. How can i do that?
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0answers
14 views

how to make rectangle selection by mouse on my map(world shape file) in qgis in python

I want to make a rectangle selection using the mouse on my map (world shape file) in qgis in python and extract the lat lon of the selection area but I don't understand how to do it. I don't have any ...
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1answer
20 views

QGIS Print composer dynamic labels

I have created an Atlas. One of my layer contain height restriction for bridges. I wish to create a label that show the lowest height restriction. I need to get the height values from my table that ...
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2answers
181 views

Boundary from Points

I have a point cloud and need to process a very detailed boundary around the outer points. Is there a tool in QGIS? Convex hull is not detailed enough. Thank you!
1
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1answer
15 views

How to read non-spatial data using PyQgis?

I'm generating maps with QGis. What I do is generate a bunch of non-spatial data on a set of cities (using VBA), and still using VBA, generate a python code that will automaticaly output general map ...
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1answer
20 views

What is the meaning of DN and DRVAL2 categorie?

I try to find the meaning of the categories DN and DRVAL2 when I used them in the command: lrenderer = new QgsCategorizedSymbolRendererV2("DRVAL2" , Categrories ); Is there any tutorial or ...
2
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1answer
23 views

How to break a closed line when intersect with polygon

I have a number of polygons (in lines shape) which represent the new condition of an area and a numder of polygons (in polygon shape) which represent the old condition of the same area. How can I ...
2
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1answer
11 views

Inserting image in an attribute table in QGIS Composer?

I'm trying to create second page of map atlas. In this page I need to show all records in the range of current atlas page. I've used Insert Attribute Table tool in composer and it worked. But I need ...
0
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1answer
15 views

GPS points of a vehicle snapped to a specific polyline path [duplicate]

So I have been capturing bus GPS locations for a while now, and I am became interested in snapping them to their corresponding polyline (route). While at first this seemed like an easy enough task I ...
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0answers
14 views

Has there been any further development in the integration of QGIS plugins to Processing Modeler? [duplicate]

I have read that there is no ability to use QGIS (2.8) plugins when building a model in Processing Modeler. All of these posts were a few years old so I was curious if there was any development or ...
1
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1answer
17 views

How to Convert Just a Sulawesi Map to Leaflet

I'm still develop a Web GIS that show population distribution in form of heat map. I'm use Quantum GIS with Open Street Map & Q2Leaflet Plugin as a tool to accomplish it. The problem is, I just ...
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0answers
40 views

Repeated GPS coordinates in data are creating stacked points on map in QGIS

I have 30+ events of data collection for each GPS location (previous person on project has simply added new rows for each data collection period). When I import the excel file (via CSV format), each ...
2
votes
1answer
26 views

Why does Points2One complain “Can't make a polyline out of one points.”?

I know this question has been asked before .I am trying to connect pairs of points by lines using the Points2One tool in QGIS. I have created the data and exported it as shape file. The data looks ...
1
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1answer
36 views

Is setting raster CRS in QGIS georeferencer useless? Still have to choose the same for target SRS?

I'm trying to move out of ArcGIS into QGIS permanently for basic operations, so be patient please. Here is the problem. I'm trying to georeference a topo map in EPSG:22523 (Corrego Alegre UTM). I did ...
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0answers
9 views

Problem on rendering categorizedSymbolRendererV2

Finally my code works but the renderering display just one color instead of 4 I don't know why, I follow the sample code of the snorf.net website and the sample code in the qgis python programming ...
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0answers
6 views

How can I inject categorizedSymbolRenderer into My QgsFeatureRenderer?

I try to get the categorizedSymbolRenderer value in order to render them In all sample of code I found ( in python but not in c++ ) it said : renderer = QgsCategorizedSymbolRendererV2(expression , ...
2
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1answer
17 views

How can I change the folder location for QGIS temporary files?

Even though I specify specific files for output, there are still a lot of temporary data being written to C:\Users\me\AppData\etc My C drive is a very limited capacity SSD and it's driving me nuts ...
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0answers
6 views

Why I have a SegFault on a newSymbol->setColor?

I am working in C++ and QT, I have to write an application based on the qgis c++ api 2.8.2. So, I try to do the same thing that the sample code in python on the webSite ...
1
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1answer
16 views

QGIS imported geotiff rendered as perspective view, how to change to top

I've created a GeoTiff that should have GPS coordinates in it using AgiSoft. When I load it into QGIS, it renders the image in a perspective and I want to always see the image from the "top" down. ...
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2answers
27 views

QGIS 2.10.1 (64bit) rotation field setting missing

I cannot find the the rotation field setting under the properties-layer settings-advanced (for styles) menu in the new release of QGIS (2.10.1 64bit). The only setting what is available there is the ...
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0answers
20 views

Making raster from vector

Have you ever met with nan value in raster? Im making raster in qgis from vector (one point) and all I have got is nan value and black raster.
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0answers
22 views

Can I use .aux, .sid, .sid.xml, .sid.aux.xml, or .sdw files as raster in QGIS?

I am working with data from my boss who uses ArcGIS. I am aware that .aux files accompany raster files, but to my knowledge you can still use .aux files to create rasters in ArcGIS. I'm working with ...
2
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1answer
20 views

How to create a new empty memory layer with fields scheme from other layer in QGIS?

Being a complete noob with python so far, I got inspired by this answer: http://gis.stackexchange.com/a/155988/8202 to dive into it a bit. When creating features in a new target layer from an ...
2
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0answers
17 views

QGIS RGB image to HSL (Hue Saturation Luminance)

is it possible using QGIS (2.10) on windows to convert an RGB image file to HSL (Hue Saturation Luminance) format. I've seen various formulas for this written in Java however they only seem to be for ...
0
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0answers
13 views

How can I connect MYSQL database in python for QGIS desktop Application?

I am following below process. 1 - Setting You must install a MySQL driver before doing anything. Unlike PHP, only the SQLite driver is installed by default with Python. The most used package to do ...
2
votes
1answer
39 views

How to place labels at the boundary of the current map extent

I have a layer of reference grid lines on top of several map layers. The grid lines should be labeled with coordinate values: vertical grid lines with x-values and horizontal lines with y-values. The ...
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0answers
13 views

Fail in searches on the joined table data

When a table is joined to a attribute table, the searches on the joined table data return a fail. Is there another way to solve this inconvenient without save the layer with joined table under a new ...
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2answers
40 views

Opening HDF data in QGIS on Ubuntu?

I try to open modis aqua data (HDF5 format: A2015208112000.L2_LAC_OC.nc) on QGIS 2.8 ver. And an error appears: No extra dimensions found. Could someone help me to solve this problem?
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0answers
25 views

Join tables in QGis 2.01. Dufour

I performed a "join" going to the properties option in a shapefile (in this case is just a table), in order to join the attributes from another shapefile that has a field in common, specifically ...
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0answers
9 views

dynamic styles for rasters in qgis processing

I am writing a qgis processing script that loops a table column and does interpolation and would like to know if it is it possible to generate styles on the fly for raster layers and how to do it. I ...
1
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1answer
17 views

Information about the setDataDefinedProperty

In the QGis C++ API v1.6 there is a function called setlowerValue to set a value for a specific Symbol In my application i use QGis C++ API 2.8.2, i try to understand how the function ...
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0answers
22 views

Using Multiprocessing inside a plugin in Qgis

I spent quite a bit of time looking on how to use the multiprocessing package, but couldn't find anything on how to use it inside a plugin in QGIS. I am developing a plugin that does some ...
1
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1answer
13 views

Relation Reference to simulate filtered drop-down lists

I have a layer of Land Uses that has a 3-tiered classification system (basically so that it can be broken down for different uses by other people). I have managed to create Project Relations and use ...
2
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1answer
19 views

How to automatically load QGIS actions

There is something that I like alot in QGIS, and that is actions. From automatic wikipedia search, to opening an image, this use makes QGIS feel very dynamic. Unfortunately I have no idea how to ...
2
votes
1answer
27 views

Share a qGIS sales territory database across a cloud based office

The business I work for has a network of dealers across America. Dealers are assigned ZIP codes. When we have a potential dealer, we would like to create a new territory for them and integrate it into ...