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

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68 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
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1answer
58 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
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1answer
22 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 ...
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0answers
13 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 ...
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2answers
46 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 ...
2
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1answer
28 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 ...
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0answers
22 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 ...
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2answers
65 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. ...
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0answers
17 views

Integrate Qgis project to web based google api [closed]

I was planning to convert the shape file into KML which google map supports. However, my project also includes TimeManager and PostGIS database. How do I handle them?
6
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1answer
191 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, ...
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0answers
21 views

How to remove covering lines? [on hold]

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
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0answers
15 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 ...
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1answer
13 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 ...
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0answers
24 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
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0answers
21 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 ...
1
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1answer
17 views

QGIS get currentfeature's color in the Expresions Builder

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 ...
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0answers
17 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
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1answer
39 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 ...
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1answer
36 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
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0answers
32 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?
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0answers
26 views

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

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 ...
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0answers
22 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
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0answers
22 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
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2answers
57 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 ...
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0answers
18 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 ...
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0answers
13 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 ...
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0answers
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
votes
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 ...
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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
52 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
32 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 ...
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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. ...
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0answers
40 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
20 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 ...
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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
votes
2answers
83 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 ...
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0answers
49 views

Projection for alignments [on hold]

I would 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 ...
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
35 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
36 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 ...
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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
33 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 ...
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0answers
36 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 ...
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1answer
34 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
35 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
30 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 ...