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

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2
votes
0answers
45 views

Show dimensions on polygons

I have a shapefile that contains all of the property parcel lines in King County, WA. We are currently displaying this data through mapbox on our site with no issues. We would like to be able to show ...
2
votes
2answers
326 views

Create circle shapefile vector in QGIS

Is it possible to create a circle shapefile feature in QGIS, like it is possible to do in ArcMap? I am trying to digitise a map wich features roundabouts, which I'd like to be part of the same ...
1
vote
0answers
29 views

assign text values to selected subset in the attribute table in QGIS [closed]

I am using QGIS and I would like to generate a new string of text in the attribute table for a selected subset of features in a vector file. I cannot find an operator in the field calculator to ...
1
vote
0answers
40 views

Accessing elements Linestring and points from a DGN file and displaying both layers on QgsMapCanvas

I am using PyQGIS APIs to develop a standalone application which currently display's map data layers on QgsMapCanvas from .shp, .tif, .dgn files. I am able to do it for .shp and .tif but not for .dgn ...
1
vote
0answers
47 views

Shaded KML overlays on OSM tiles in QGIS?

This seems simple - but the solution is escaping me. I have a series of dynamically generated KML files describing simple, shaded polygons, with each polygon having a slightly different (externally ...
2
votes
1answer
45 views

Reproject X coord value in Shapefiles

I convert Bavarien NAS-Data (DHDN 3 Degree Gauszone 4) via ogr2ogr into shapefiles: "C:\Program Files (x86)\QGIS Wien\bin\ogr2ogr.exe" "ESRI Shapefile" -skipfailures Entenhausen.xml This seems to ...
1
vote
0answers
18 views

QGIS: Waypoint name (symbol label) in two rows [duplicate]

I have couple of longer waypoints names that I would like to put in two rows with center formatting but I just don't know how? I tried to put tag but it doesn't help... For example I have the ...
0
votes
1answer
74 views

how can I join excel sheet with point shape file?

How can I join an excel sheet with shapefile (Point) and common field is station code. In excel one station code has multiple rows and I want to attach those values with shapefile.
0
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0answers
75 views

Loading max WSEL from HECRAS in RiverGIS plugin?

When I Load max WSEL from HECRAS in RiverGIS plugin, I don't know What it happen? An error has occured while executing Python code: Traceback (most recent call last): File ...
1
vote
0answers
113 views

QGIS 2.8.2 - Using spatial expressions in labelling

I'm creating some hard copy map output from QGIS. I want to use an expression to suppress labels for some features on a layer when another feature from another layer intersects with those features. ...
1
vote
0answers
55 views

Polygons in Polygons

I have 2 layers, they represent 2 different data. I did a spatial join to see the polygons that fall in the other layer using the match option as identical. Before, i used the intersect as the match ...
0
votes
0answers
37 views

Changing postgresql security settings

I have setup a postgresql database with log ins as "admin" with full edits and "users" as read only. A number of "users" have been using this since for read only access. However, I set this up using ...
3
votes
0answers
83 views

SAGA hydrological analysis in QGIS 2.8 on Mac

I am running QGIS 2.8 on a Mac machine and I want to calculate the catchment area using SAGA - Catchment Area. It starts running but after a while when QGIS wants to open the generated files there is ...
2
votes
1answer
79 views

QGIS feature subsets are incompatible with table joins. Bug?

When using QGIS 2.8.2, I am unable join a table to a layer that has a feature subset (Layer Properties > General > Feature Subset). For example, creating a feature subset on a layer prior to joining ...
2
votes
2answers
246 views

QGIS/Python script to generate random points many times

Good day. Can anybody provide a simple code to be run in the Python Console of QGIS (I am using 1.8 Lisboa) to generate X number of random points (say e.g. 5000) over a certain global shape of ...
3
votes
0answers
97 views

Which projection can I use to see alignments on great circles?

I want to put on a QGIS map some historical sites to check if they are aligned. If an alignement exists, the points should stay on a great circle (is this correct?). I want to visually verify this ...
3
votes
2answers
102 views

How can I move the toolbar if its holder is out of screen?

While I was editing the toolbar, the holder stayed out of the screen. so I can't move it. How can I fix it?
3
votes
2answers
236 views

Map canvas overlay layers QGIS

I built my own map canvas inside a plugin in QGIS and I want to add two layers (one by one) in order to overlay the two. I have this code: fileCI = "....\plugins\teste\test.shp" fileInfo = ...
3
votes
1answer
119 views

Speed of people measured by gps

I was tracking tourist's movement patterns in a city with GPS and I would like to know the speed of all participants (60). The data were recorded and saved in gpx files, so in order to open it and ...
2
votes
2answers
297 views

Why is SAGA from the Processing Plugin not recognised?

Similar to this post: SAGA algorithms don't work in QGIS 2.8 except the fact that SAGA does not appear at all in the Processing Toolbox: As a check, I used the Python Console with the following ...
1
vote
0answers
61 views

How to avoid “Handle bad layers” message when opening a QGIS project file?

Most of the time I have to reload all the layers when opening a QGIS project file (.qgs), which is pretty annoying. I didn't change the name of the files and folders and I didn't change the folder ...
0
votes
0answers
16 views

Cut polygon with polygon QGIS [duplicate]

I have two polygons. One sits mostly within the other (pink) and I would like to cut this from the other polygon (blue). This is a feature I have used before in MapInfo but struggling to find the ...
1
vote
0answers
28 views

migrate an application under 1.6 to 2.8

i would like to know what are the recoomandation if i want to update an application based on a old version of qgis in my case my application was written using the 1.6 qgis, and now we want to use it ...
2
votes
0answers
50 views

Generate ID for the grid of points from top-left corner down [duplicate]

I have a grid of points extracted from a raster. I need to give them a new ID value to be able to join values from it to another grid in rotated system of coordinates.The automatically generated ID ...
1
vote
1answer
124 views

How to remove vector grid cells that don't overlap with features from a certain layer in QGIS?

I am working on displaying a road network with QGIS (2.4). Doing this I have a couple of layers, including a base network of roads, and my modified layer. All in all they become a huge network. ...
1
vote
1answer
162 views

Compile pluging for qgis 2.8.2 with pb_tool or Makefile, in windows

I created my pluging with pluging builder, after compile the resources file, i test my pluging in Qgis. I modify the ui file in QtDesigner, but i don't know how to compile it in order to see the ...
1
vote
0answers
101 views

import qgis geoprocessing tools in python os x 10.9.5

I'd like to use the python bindings from qgis, but in a standalone project. I need the geoprocessing tools for vectors. I updated QGIS (Wien - 2.8), python (3.4.3), etc. However, it always ends with ...
2
votes
2answers
218 views

NDVI from Landsat8 LandsatLook images

I have downloaded landsat image from this site and now Im wondering if i can get NDVI index from it. In raster calculator I have only 3 ranges, shouldnt be four? Or am I doing something ...
1
vote
0answers
97 views

QGIS python originalName() does not return actual original layer name

I am writing a Python QGIS Plugin, using QGIS version 2.6 as the basis for development. When loading data into the canvas programmatically, I am trying to maintain the spatialite table name as the ...
2
votes
1answer
70 views

Error Packaging QGIS 2.9.0

I am attempting to package QGIS from source and the creatensis.pl script is exiting with the error: Running NSIS Can't open script "Master'" running nsis failed [makensis -V1 ...
1
vote
1answer
29 views

Get page coordinates of QgsComposerMap

How do I get the coordinates in page units (i.e. millimetres) for a QgsComposerMap item? I can get the upper left coordinate using pos, but can't see any method that provides access to the width and ...
0
votes
1answer
48 views

How do i match Layers in QGIS

am trying to create a map, which shall show NRW ( a part of Germany) with some extra gimmiks. Those Gimmiks are Coordinate based locations of several Manufacturers. Later on i want to adjust the ...
0
votes
0answers
12 views

How to render visualizations for geospatial objects (the way QGIS does it) on web interface for end users, from PostGIS database? [duplicate]

I have existing geospatial objects in PostGIS. I can visualize it using QGIS. But I want to render these visualization on a web-interface for my users as a result of some queries in the database. I ...
1
vote
0answers
147 views

How to display missing objects in QGIS 2.8.2 cartogram?

I've just created cartogram using styles/graduated symbol. But there are some missing elements on the map. Objects without data in attribute table are not present on the map (NULL in corresponding ...
1
vote
0answers
28 views

'Locking' intervals in interval determination

Working with graduated maps in Qgis 2.8 I'd like to lock a certain interval value while letting Qgis determine the rest - in relation to eg. missing values. I know how to work with queries, but this ...
2
votes
2answers
453 views

How to extend line features up to their intersection point in QGIS?

Is there a tool or plugin in QGIS to extend line features up to their intersection point?
1
vote
0answers
119 views

extract x-y from a point created from lat/lon coordinate

Using QGIS 2.8.1, how can you create a point in WGS 84 using a lat/lon and extract X and Y value of this same point in CRS UTM34N. For eg, you have been given a lat 20 deg and lon 50 deg. Create a ...
1
vote
1answer
395 views

How to set CRS in QGIS using pyQGIS

This question is very similar to these one , but it's doesn't work for me. This is my try: ........ vlayer.setCrs(QgsCoordinateReferenceSystem(25830)) ...
1
vote
1answer
64 views

Labeling layers with Python in QGIS. LinePlacementFlags

How could I set LinePlacementFlags with Python in QGIS? My code is something like: palyr = QgsPalLayerSettings() palyr.readFromLayer(layer) palyr.enabled = True palyr.fieldName = "attribute" Then ...
1
vote
0answers
54 views

PostgreSQL owner/role administration for QGIS projects

What's the best way to administrate PostgreSQL roles for QGIS projects? I've created a separte schema for each of my QGIS projects. Is it possible to revoke all privileges except "select" for finished ...
1
vote
0answers
26 views

Forcing area calculation into miles in QGIS (without changing the PCS) [duplicate]

I'm working on an assignment that requires me to create an area column in miles without changing the projected coordinate system. ArcGIS has a tool that can do this ('Calculate Geometry')-- does QGIS ...
3
votes
1answer
543 views

How to change default path for “.qgis2” folder on Windows?

I'm working with windows 8 32 bits OS and qgis 2.8.2. The qgis default installing path for ".qgis2" folder is C:\Users\image95.qgis2. This directory stores several usefull components like qgis ...
1
vote
1answer
165 views

How to load an (updating) point layer from Access?

I have a database table linked to the QGIS project which contains X,Y & Z coordinate information, which I can display in the Map View window of the project, after having used the “Points Layer ...
2
votes
1answer
54 views

Executing a QGIS model per feature of a polygon

I have just got into QGIS models and want to run the attached model per feature in a polygon shape file. I have been trying to do this in two ways and neither of them work. I tried find ...
3
votes
1answer
179 views

Get vertice information and apply to line segments using ArcGIS for Desktop (or QGIS)?

I've recently started tracking bike treks using Strava and I thought it would be interesting to do some analysis on my treks. I am able to import the GPX file into ArcMap and convert it to a point ...
1
vote
1answer
42 views

How to display the join field in a QGIS join?

Upon joining tables in QGIS (2.8.2) I am unable to view the join field in the resulting join. Additionally, the join field is not listed in the target table's Layer Properties, even though the other ...
2
votes
1answer
15 views

Joined Attributes not recognized in mean coordinates

I am trying to find mean coordinates of a shapefile to which I have joined a csv file for population attributes, but these will not show. I'm working with county data of each US state based on the ...
4
votes
1answer
116 views

Select a column like Primary Key in a View from PostGIS using PyQGIS in QGIS

Postgresql doesn't support Primary Key in views. When I load a postGIS view in QGIS "manually", I can choose the column that will be the Primary Key, but I would like to know if I can select a column ...
0
votes
0answers
36 views

Related Spation and non-spatial in QGIS

I am working with QGIS 2.6.1 by adding data from server using PostGIS. Now, I want to see the attribute information. So, how can relate the spatial with the information?
0
votes
0answers
121 views

How to relate a Spatial and Non Spatial table in PostGIS to be visualized in QGIS

first of all I'm quiet new in PostGIS. I'm working in pgadminIII with postGIS. I have in one database two tables. See the two tables SQL Pane. CREATE TABLE gw_body_characterisation2 ( ...