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

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15 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
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1answer
37 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
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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
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1answer
53 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.
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0answers
34 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
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0answers
38 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
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0answers
43 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 ...
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0answers
24 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 ...
2
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0answers
21 views

SAGA hydrological analysis in QGIS 2.8 on Mac

I am runnung QGIS 2.8 on a Mac maschine 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 ...
1
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1answer
33 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
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2answers
90 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
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0answers
66 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
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2answers
76 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?
2
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2answers
37 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
90 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 ...
1
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1answer
39 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
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0answers
24 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
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0answers
13 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
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0answers
23 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
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0answers
34 views

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

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
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0answers
39 views

Mean Shift Segmentation Error: The following layers were not correctly generated - QGIs + Orfeo Toobox

I have been trying to do an object based classification using QGis + Orfeo Toolbox. I downloaded the Q Gis 2.8.2 and OTB from OSGeo4W Network Installer. I am using OS Windows 7 enterprise. When I ...
1
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1answer
36 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
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1answer
37 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 ...
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0answers
31 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 ...
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2answers
83 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 ...
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0answers
46 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
44 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
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1answer
17 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 ...
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0answers
36 views

problem with header in qgis 2.8

i have an old project based on qgis 1.6 i had to upgrade it to qgis 2.8 but during the make it seems that a lot of header or classes has disapeared by exemple in the 1.6 the classe ...
0
votes
1answer
32 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
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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 ...
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0answers
86 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 ...
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0answers
22 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
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1answer
63 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?
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0answers
22 views

Polygons in place of points on a grid in QGIS?

In QGIS, how can I create a shapefile with polygons of a known size (ie. rectangle 30m x 40m) placed on a grid with 1km spacing? That is, polygons in place of points on a 1km grid.
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0answers
63 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
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1answer
50 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
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1answer
34 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 ...
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0answers
27 views

How do focused tests Diggle and Score Lawson-Waller in QGIS?

Is possible do the focal tests Diggle and Lawson and Waller using a add-on in QGIS? If it is, how, please????!!! About the tests: ...
1
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0answers
39 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
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0answers
25 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
114 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
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1answer
67 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 ...
1
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0answers
27 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 ...
2
votes
1answer
78 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
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1answer
27 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
13 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
55 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
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0answers
22 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?
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0answers
45 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 ( ...