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

learn more… | top users | synonyms (1)

1
vote
2answers
6k views

How to export and import gps points from Garmin 62S and QGIS

I'm pretty new to using QGIS and I'm curious about how to import and export GPS points created in QGIS. I have QGIS 2.0.1 dufour on windows XP and a Garmin 62s. Any suggested walk throughs would be ...
2
votes
2answers
195 views

QGIS image export changes the map center and scale

I've been trying to export a few map layers using QGIS print composer. First, I loaded the layers and opened the composer using Project -> New Print Composer: Gave it a proper name: Added a ...
0
votes
0answers
29 views

How to turn this into a routable network that works with pgRouting? [duplicate]

I'm only asking again since I didn't get any answer and I'm still stuck here... I updated my last question with more info, but it wasn't answered. When I draw a line with snapping enabled and try to ...
1
vote
1answer
141 views

distance to polygon boundary

i have a layer of points, and a vector layer of county boundaries for the UK. I would like to be able to find the nearest county boundary to any given point and the distance using QGIS. any ideas? ...
1
vote
1answer
93 views

python scripts for accessing info from a postgresql database in case of a qgis application?

I am beginner and I need to know if I could access a postgresql database from python script made for a qgis application
1
vote
1answer
202 views

Help me to visualize polygon and point data [closed]

As part of pilot project, we have collected basic/rudimentary Household survey in one district. We have both Polygon and point data.Attributes of the database include, No of people living in the ...
1
vote
3answers
172 views

How to find area/multipolygon bounded by three other multipolygons?

Trying to get my head around PostGIS and QGIS...I'm trying to find the area (in white) bounded by three multipolygons (in purple) - refer to picture. Each multipolygon only touches the other two ...
3
votes
1answer
588 views

How to draw a simple bus network that works with pgRouting?

What I'm I doing wrong? I've created a new shape layer for lines, I've enabled snapping with 5 map units for that layer. When I draw a line between two of the stops I get a purple marker when I'm at ...
3
votes
1answer
284 views

How to apply a color gradient to a shapefile from QGIS console?

Anyone knows how to do a color gradient from the console to a shape file in Qgis (orin Python)? Like the image below.
0
votes
0answers
152 views

issue with QGIS Scale Level

I have different layers of shape files. I have imported all shape files into PostGIS. Now i want to show 3 layers Country, State & District with different scale/zoom level I tried to set scale ...
0
votes
2answers
107 views

How do I make shapefiles that I converted from .KML appear in QGIS?

I have created shapefiles from Google Earth but they do not show in QGIS, whereas in ArcGIS they do. I have made sure they are at the top of the layers, not transparent and also I have changed their ...
1
vote
1answer
54 views

not all polygons showing up in qgis 2.0

I am working with the block group shp files that I got from tiger 2010. When I bring in the shp files some of the block groups show up, but this is spotty. I have adjusted the CRS and still nothing. ...
2
votes
0answers
535 views

application of gis in geology [closed]

I am a student of geophysics and I am studying geographic information systems (ArcGIS) and we have been given a project. As I do not have much information about GIS capabilities can you please suggest ...
1
vote
0answers
18 views

How to move an existing point object to a coordinate? [duplicate]

Is there a simple way to move a point to an exact coordinate (do not intend to create a new point but move an existing point)? Something like, write the coordinates and move a selected point for ...
0
votes
0answers
419 views

Using Tile Mill and GeoJSON

I am trying to use Tile Mill and GeoJSON layers to have an image appear within a tooltip but it is not working properly. The process I go through to get the GeoJSON: 1) load .shp into QGIS 2) save ...
1
vote
1answer
473 views

How to get Google satellite images (via the plugin) to behave well in QGIS with a map created with a different CRS? [duplicate]

How to get Google satellite images (via the plugin) to behave well in QGIS with a map created with a difference CRS? I have a problem using the Google Image layer plug in - at some scales, it won’t ...
1
vote
1answer
244 views

determining what polygons intersect another layer

I am attempting to establish what spatial relationship exists (if any) between two layers. I have two layers - one is a road network with a buffer of 500m, and the other is a collection of polygons ...
0
votes
1answer
112 views

What expression returns data defined color from a color field eg: (30 50 40 10) using color_cmyk

Hi I have a geology plan with a base color field. I need to write an expression in the data defined color option using "color_cmyk" command. I can not seem to get the expression written correctly. The ...
3
votes
2answers
1k views

Calculating elevation profile of a trail?

What would be the best way to calculate an elevation profile of a trail remotely (without using altimeter/gps tracking your steps)? For example, to do it in the most rudimentary way you might take a ...
2
votes
2answers
461 views

How to Calculate Custom Zonal Statistics?

I have a vector polygon shapefile outlining counties for which I have a raster of nighttime-luminosity data. I've been able to compute Zonal Statistics in ArcGIS 10.0 using Zonal Statistics as Table ...
2
votes
2answers
632 views

QGIS DXF file projection match

I need to use this file on a map but I am not able to match the projection with the others I have, primarily data downloaded from OSM (city of Boston). I read many articles, I have repeatedly tried to ...
5
votes
2answers
266 views

Can someone clarify some details about freehand line tracing in QGIS?

I have read several tutorials and questions here on this site, but I have some lingering questions/doubts that I would like clarified. My project is tracing roadways from a 1926 map so that I can ...
1
vote
0answers
90 views

Megellan Meridian and QGIS GPS Tools help request

I am using QGIS 2.0.1 on Ubuntu 12.04. I have a Magellan Meridian GPS and I trying to use the GPS Tools plugin to download waypoints to a layer in QGIS. I have successfully used the Gebabbel ...
2
votes
1answer
374 views

Creating buffers that will not overlap in QGIS

I am dealing with a .shp with a number of points in it. The distances between points range from ~300m to 5km. I wish to create a 1 km buffer around each point with as little overlap as possible. Each ...
0
votes
2answers
193 views

How to add Excel-sheets with meter coordinates to QGIS?

I have an Excel-sheet where the coordinates are in meters. What is the most efficient way of inputting this file to QGIS? There are thousands of files to put so please recommend some straight-forward ...
2
votes
1answer
141 views

Bug when viewing data from SQL Server in QGIS

I'm having an issue with viewing data in QGIS 2 based on a spatial query in SQL Server 2008 R2. The data appears to load, polygons appear and I can add thematic shading based on data. However when I ...
1
vote
2answers
323 views

QGIS export ESRI Shapefile to SpatiaLite format issue

I am trying to export a shapefile of 3221 mixed POLYGON and MULTIPOLYGON geometry elements and every time, I get this same error: Does anyone have any idea what's going on? And no, this is not an ...
2
votes
0answers
86 views

Longest slope oriented to north?

I need a help with my homework. I have created digital elevation model from the shapefile. In QGis(Grass plugin) This is how far i can go. I have to find the longest slope oriented to North. I know ...
1
vote
1answer
639 views

What is the best way to ortho-rectificate image from the plane?

I am very new in GIS and I am trying to ortho-rectificate my images. But after putting it on the map I see that results are not precise. We have images taken from the airplane, it's longitude, ...
1
vote
1answer
224 views

How to find matching pixel values in seperate rasters

I am looking to scan two separate rasters, capture the pixel information, then draw a polygon of the matching pixels. any thoughts? I am at a loss. Edit: I have two aerials, both are in ...
0
votes
1answer
50 views

What could cause issues migrating a Python plugin to another Windows version? [closed]

I am developing a plugin in my laptop and the plugin runs well. So, I installed the same version in other computer and the plugin doesn't run well. Sometimes I develop the code in laptop, sometimes in ...
0
votes
1answer
100 views

QGIS Web Url paramater zoom / scale

I have a link for wms in QGIS Server like this: ...
4
votes
1answer
2k views

QGIS on Mavericks

I have been trying to install QGIS on Mavericks and I have failed. Prior to installing QGIS, I installed GDAL using homebrew. I also installed Numpy, SciPy and pyqt using the detailed instructions ...
1
vote
2answers
172 views

How to create buffer zone in metres for OSGB1936 layer?

I am creating buffer zones in metres on top of UK Ordnance Survey map files that are in OSGB1936 which uses degrees. How do I draw the buffers in meters? Many thanks
0
votes
0answers
396 views

Best way to join and handle multiple attributes related to the same feature

this is not going to be a question, I'm just trying to find some advice. Suppose I have a point shape file (for example just 2 point, actually I have many more points) representing water control ...
0
votes
1answer
96 views

Can I “undo” buffering of a point layer in QGIS?

I have point layer, where each point is one tree, about 1300 trees in total. I made buffers around each tree, the buffer being the height of each tree in QGIS 2.0.1. My next step was to use Spatial ...
0
votes
1answer
71 views

How do I get basic statistics on a field in a joined table?

I have a shapefile to which I've joined a table, matching with an ID field. All the fields of the table show up correctly when I open the shapefile's attribute table. But when I go into ...
3
votes
2answers
330 views

Working with GDB in QGIS 2.0 - plain language instructions please!

I'm a QGIS user running v2.0 (Dufour) on Mac OSx10.8.5. I have some data in .gdb format and need to access this and work with it in QGIS. I'm a relatively savvy computer user, but not at all a ...
1
vote
0answers
141 views

Problem installing QGIS on Mavericks. Says I need 10.6.8

Trying to install QGIS for first time on a Mac OS X 10.9 (Mavericks). Loaded up all the prerequisites (GDAL, etc.) but the QGIS installer tells me "QGIS requires Mac OS X 10.6.8.". Saw that QGIS is ...
2
votes
2answers
338 views

How to translate (reposition) a .tif raster layer?

I'm starting to use QGIS for my thesis (environmental physics) and have to admit I'm pretty ignorant about it - I've always used Mathematica or Matlab. My problem is: I have a raster layer, in .tif ...
1
vote
1answer
557 views

Select polygons by attribute belonging to another layer

I'm a recent QGIS user. I have a shapefile A with a series of polygons indicating land use of an urban region (urbanised areas). Now I want to select them in relation to a second shapefile B with the ...
1
vote
2answers
479 views

Import Esri/ArcGIS .e00 files to QGIS on Linux (getting error message)?

I can't seem to import Esri .e00 files into QGIS, and I can't figure out why. I'm trying to import files I've downloaded from ...
0
votes
0answers
69 views

Loading QGIS and files from Python's use of os.system?

I am trying to open QGIS and load two files using the following code in Python: os.system('qgis D:\data\vector.shp D:\data\raster.tif') However it returns this error message: 'qgis' is not ...
0
votes
2answers
117 views

Python Error in QGIS Ubuntu 13.10 while trying to join .csv tables

Using the mqgis plugging in QGIS I cant join my csv file... This is what QGIS returns me: An error has occured while executing Python code: Traceback (most recent call last): File ...
1
vote
1answer
122 views

Clip raster with shapefile

I want to clipping raster (Lidar) with shapefile in qgis ver.2.0.1. Which plugin in qgis could I use it ? Thanks for help me.
0
votes
0answers
183 views

Google Maps basemap not showing up when KML file added as a vector layer in QGIS - only point markers appear

I am trying to make a basic XYZ contour plot in QGIS 1.8.0 (longitude, latitude, depth in an excel file) and can't get past the first step of adding a basemap in QGIS. I've tried using the Open ...
0
votes
0answers
154 views

Invert axis orientation in QGIS

I'm loading two WMS layers served from GeoServer with declared srs EPSG:4326 in QGIS 2.0 in EPSG:4326. The two layers displays correctly when I zoom in to Sweden. If I display the two layers in ...
5
votes
1answer
1k views

How to set up a Web Map Service with QGIS?

I am very new to QGIS environment.I wanted to work with creating Web Map Service using QGIS server.Does it possible to create Web Map Service in QGIS sever? can anybody help me with resource link and ...
1
vote
1answer
59 views

When I save a project to a folder, I get this error message

I opened QGIS, started a new project, and loaded rasters. Then I saved the project to a folder I had already created. I got the following error message. The same exact message appeared when I closed ...
1
vote
1answer
47 views

Rough edges on tiles in QGIS

I'm loading four .ASC files into QGIS, each containing topographical data about a tile of 10 x 10 km. On the map, this data is displayed as black/white and different shades of gray. My problem is that ...