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

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2
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0answers
24 views

Help Needed with QGIS Vector->Geoprocessing Tools->Difference [duplicate]

I'm trying to use the Vector Geo processing Difference Tool in QGIS to "take a bite" out of one polygon using another in another layer. The tool menu Difference icon is exactly what I'm trying to do - ...
0
votes
1answer
69 views

Create ID for each string attribute in QGIS

I'm trying to rasterize a vector layer by using an attribute filed stored as string, I got the confirmation through the GDAL mailinglist serv that gdal_rasterize does not work with string field. So my ...
2
votes
2answers
100 views

Where to get QGIS toolbar icons?

Does anybody know where to download the QGIS toolbar icons?
1
vote
1answer
70 views

How can I overlay city and borough names in QGIS with political boundaries?

This post is related to this one. The following images are from @Weinfried's answer. I was able to get the ITA_adm0.kmz, ITA_adm1.kmz, ITA_adm2.kmz, but not ITA_adm3.kmz, which for some reason does ...
1
vote
1answer
34 views

QGIS Coverage help

I am using QGIS 2.8.2 and everytime I try to load in a coverage type Shapefile, like forest density or population density it all comes up as the same color, but has the sections marked for the density/...
0
votes
1answer
144 views

Generating elevation 'database' from NED IMG data

I'm starting to work with the NED 1/3 and 1/9 arc-second data. I've been using gdal in Python and QGIS to do some basic conversions of the raw .IMG data from USGS. My goal is to get elevation data of ...
1
vote
0answers
68 views

How can I render heatmap contours from QGIS into tiles?

I have a heatmap and contours in QGIS, and I want to export these heatmaps as tiles. This works well with tiff, but I want to include contours into images, to make them look better. In QGIS, I can ...
1
vote
0answers
24 views

Loading Batch Parameters in QGIS [closed]

I usually work my batches in Excel and then copy/paste it into ArcGIS batch UI. Is it possible to do the same in QGIS? The tutorials I've seen show how to fill the interface line by line, only. I'm ...
1
vote
1answer
114 views

Adding the map canvas center to a composer label in QGIS

I am able to access the map canvas center in the python console in QGIS using qgis.utils.iface.mapCanvas().center() What I would like to do is get this into a map composer label. Is this possible?...
1
vote
1answer
542 views

Calculating Area of Intersecting Polygons and Buffers

SO, in QGIS I have several points with 1km buffers around them; some of the buffers overlap. Within the buffers are a number of ponds, which I have a shapefile for. I want to calculate the area of ...
4
votes
2answers
217 views

QGIS create a line graph with attributes value on a section through the map

I wonder if I can make cross sections of GIS data (other than height). An example: I have a shapefile of a city with building plots and attribute values of the plot size. I want to choose a random ...
1
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0answers
26 views

Shifted point in pdf export on QGIS [duplicate]

When I print as PDF a work done with a shape point and OpenLayer plugin I notice that the point are shifted In the dual screen image you can see the pdf exported image (left) and the QGIS woriking ...
1
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0answers
82 views

cannot load moule sip qgis 2.8.2

i have an error when i launch the qgis 2.8.2 it says that the module sip cannot be load python 2.7 has been installed i am under ubuntu 14 please if you have any idea here is the message (in french ...
3
votes
1answer
58 views

PostGIS - interfacing with CADCORP 7.1 and QGIS - user 'postgres' can import, but no other roles can

I'm new to PostGIS (reasonably) - but I'm plagued with one on-going problem: I'm able to access PostGIS from various GIS systems using the main 'postgres' user. Using a newly created user 'gis_viewer'...
2
votes
0answers
108 views

How to edit the GUI of a QGIS plugin not made with the plugin builder?

I edited a python plugin's code and had to change the UI a bit as well. However, unlike in the plugins I made from scratch with the plugin builder, the UI doesn't automatically update in QGIS when I ...
1
vote
1answer
168 views

Setting PYTHONPATH for compiled QGIS version on Linux

I'm trying to set the PYTHONPATH in order to be able to load the qgis classes in a python console (not the QGIS Python one). I followed some resources I've found (PYQGIS Cookbook, and others) but I ...
1
vote
1answer
115 views

How to register “events” for linear referencing in pyqgis?

Is there an easy solution for recording events for a line crossing borders of zones in a polygon layer? I need to implement this in python using QGIS, thus pyqgis. The image attached illustrates what ...
1
vote
1answer
881 views

How to select polygon features that intersect a line feature using pyqgis?

Is there an easy way to select all features in a polygon layer that intersect (overlap) a line feature? I need to implement this in python using QGIS, thus pyqgis. This code illustrates what I am ...
1
vote
1answer
62 views

Why does the Contour Plugin failt to load in QGIS Valmiera?

Whenever i try to load the contour plugin. I get the error as follows: The same happens to when i try to load Qgis2leaf plugin... An error has occured while executing Python code: Traceback (most ...
2
votes
0answers
147 views

Installing exifread for QGIS photo2shape plugin for novice

I'm trying to install exifread so I can use the photo2shape QGIS plugin. I know nothing about python and I haven't been able to get it to work using the answers from previous questions. Can anyone ...
1
vote
2answers
168 views

Creating Protocolbuffer Binary Format (PBF) file using QGIS?

I have a set of geospatial data, lines (streets) in geojson and shp file format which which i want to convert to PBF (Protocolbuffer Binary Format). I am presently working with QGIS. Please does ...
3
votes
1answer
170 views

How to count points within the current Print composer atlas feature in QGIS 2.8?

In the print composer when generating an atlas, does anyone know how to show he feature count per each atlas coverage feature? For example, I have generated an atlas where each map is a different ...
1
vote
0answers
117 views

Add Vector Layer - Database OODBC does not work

What I am trying to do: Add a vector layer from an remote Oracle database. Platform: Linux Red hat 7 Database: Oracle 11g Connectivity via unixODBC Oracle Description: I tried to add a vector layer ...
2
votes
2answers
715 views

Attempt to install QGIS 2.8 on Ubuntu 15.04 installs old version instead

I previously had installed QGIS 2.8 with the GRASS plugin on Ubuntu 14.04. Through a chain of events I ended up having to do a clean install of Ubuntu 15.04, and am attempting to re-install QGIS 2.8. ...
9
votes
2answers
887 views

How to refer to another layer in the field calculator?

Is there a way to select an attribute from a polygon layer and insert the value into a virtual field of a point layer using "within" in the field calculator? CASE WHEN within($geometry, ...
1
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0answers
46 views

How to remove covering lines? [closed]

I have a shape file where there are polygons perfectly fitting, i created contour lines from all of the polygons so i have a shape containing only the lines. My problem is as the polygons were ...
2
votes
0answers
42 views

QGIS 2.8.1 (Windows 64bit). Setting snapping to the “decoration” grid?

I was wondering if anyone knew of a way to snap digitizing to the grid you can create in View>Decorations>Grid? I can't see anything in the manual or the menus so I am thinking there probably isn't ...
0
votes
1answer
98 views

QGIS geolocate a DBF file with another point layer by matching field

I have a DBF table and a SHP with points. I want to geolocate the DBF file using the points layer. Both match in a field called "unificationstring". I know how to do it in postgis but how can this be ...
1
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0answers
76 views

How to interpolate a Raster DTM

I have a GeoTIFF DTM produced from Agisoft Photoscan at 0.05 m resolution. However the interpolation used by the program to remove the riparian vegetation has used points from the channel, thus ...
2
votes
0answers
139 views

clipping raster changes raster values?

I am working with BIOCLIM temperature/precipitation layers and I have noticed that when I clip the global raster down to a specific region, something happens and the raster value at a specific point ...
2
votes
2answers
188 views

Getting currentfeature's color in Expression Builder of QGIS?

In QGIS Expression builder. I want to obtain the color code of the current feature. I mean: My layer contains lines, each one is painted with a different color. Now I want to assign that color to ...
1
vote
1answer
353 views

Display different symbols in QGIS using Point Displacement renderer

How to display different symbols (not different in size, different in shape and color) on the same point in QGIS 2.8 using Point Displacement renderer? I want my layout with symbols around the ...
2
votes
1answer
155 views

QGIS 2.8 OSM download with overpass fails

When trying to download OSM data in QGIS 2.8 I am using a layer to provide the extend for the requested data. The extend basically covers all the countries that share coast line of the Baltic sea (...
2
votes
1answer
99 views

Understanding QGIS scale dependent visibilty?

I cannot understand why the scale dependent visibility function does not want to work in QGIS. I'm using the latest version (2.8.1 Wien) and want to insert diagrams (pie/histogram) to illustrate ...
2
votes
0answers
52 views

QGIS: Edits in attribute table are not updated in Postgis database. Why?

As the title say. I edit values in the attribute tables of my QGIS project but there is no update to the database. I refreshed in QGIS as well as the database. What else do I need to do?
1
vote
0answers
94 views

How to convert poly-line contour feature class into heat map displaying heights [closed]

I'm looking for a way to be able to convert contour data (as lines) into a heat map that would display the data warmest at the highest points and coolest at the lowest. I have access to QGIS, ArcMap ...
1
vote
0answers
76 views

Projections way off on data imported into QGIS?

I have elevation data as a .shp from the USDA ARS and Hi-Res Orthoimages (Mystery Projection (UTM 15N?)) from the USGS website as geoTIFFs (plain NAD 83). I am trying to project all of the images ...
2
votes
0answers
58 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
478 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
44 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
51 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
47 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
76 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
votes
0answers
88 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 "C:/Users/duy/.qgis2/...
1
vote
0answers
123 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
60 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 ...
3
votes
0answers
93 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
85 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 ...