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

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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 ...
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445 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 ...
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1answer
615 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 ...
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1answer
368 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 ...
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1answer
122 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 ...
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2answers
2k 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 ...
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2answers
577 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 ...
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2answers
814 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 ...
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2answers
300 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 ...
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0answers
98 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 ...
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1answer
429 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 ...
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2answers
211 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 ...
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1answer
157 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 ...
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2answers
402 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 ...
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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 ...
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1answer
870 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, ...
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1answer
282 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 ...
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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 ...
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1answer
126 views

QGIS Web Url paramater zoom / scale

I have a link for wms in QGIS Server like this: ...
5
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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 ...
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2answers
211 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
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572 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 ...
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1answer
111 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 ...
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1answer
83 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 ...
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3answers
377 views

How to enable Esri file geodatabase support in QGIS 2.0 on OSX?

What steps do I need to take to get Esri .gdb files functioning in QGIS? I'm a QGIS user running v2.0 (Dufour) on Mac OSx 10.8.5. I have some data in .gdb format and need to access this and work ...
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142 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 ...
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2answers
777 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 ...
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1answer
868 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 ...
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2answers
614 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 ...
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78 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 ...
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2answers
122 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 ...
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1answer
138 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.
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213 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 ...
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204 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
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1answer
2k 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 ...
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1answer
65 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 ...
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1answer
55 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 ...
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1answer
218 views

Retrieving lost data from QGIS

I'm trying to help a friend retrieving QGIS data from a formatted drive. Finding the .qgs project that was saved on the desktop is no problem, but it seems that there is no actual data located in ...
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0answers
206 views

How to use buffer() in QGIS Value Relation field

When adding a point, I'd like to auto-populate one of its fields (the street address) setting it to a field in the nearest point in another layer (a layer containing all existing addresses). It ...
2
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1answer
165 views

Trying to set NAD 1983 EPSG 102631 in QGIS

I was able to find the right coordinate system online NAD 1983 Alaska But now I don't know what to do. I can't find the coordinate system on QGIS. When I choose the one I think is correct it warps ...
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0answers
174 views

How to improve creating contours for super-high unnatural mountains?

in a current project I am working on we are not mapping the actual height of a landscape rather mapping the interest which specific stakeholders have in parts of the region. So, what we did was the ...
4
votes
1answer
450 views

How do you export to georeferenced PDF from QGIS 2.0?

When I use the print composer in QGIS, there is no option to export to georeferenced PDF using GDAL. Do I need to export from somewhere else or how do I go about exporting to georeferenced PDF? I am ...
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3answers
6k views

3D visualisation with open source GIS software [closed]

I'm searching for QGIS (or other open source GIS software) tools that can analyse XYZ data. Also I'm interested to hear about if anyone have migrated to non commercial software regarding geological ...
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0answers
36 views

qgis python plugin enabling other plugins

maybe it is a stupid question but i am new in qgis. I developed some python plugins and they work correctly, now what i would like to do is to install a "door" plugin that after asked ...
5
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1answer
4k views

QGIS and SQL Server Spatial Tables Performance

I'm trying to get a SQL Server 2008 R2 spatial database up and running to streamline the production of maps using QGIS. Currently I just have a handful of spatial tables (a postcode level point table ...
5
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0answers
279 views

QGIS: How to reverse vertex ordering in polygons

I am working with an Oracle spatial connection in QGIS through which I am accessing and editing a vector layer. I find that when I edit a geometry, the vertex ordering is reversed (to clockwise in the ...
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1answer
419 views

How to find a single point furthest from any road?

I have a road layer of a country. What method or plugin would you suggest, to find a single point furthest from any road (but as you can see, there is a coastline, so points in the sea can't count) ...
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1answer
568 views

How to add the current document path on Print Composer?

I'm trying to demonstrate to my company that we can begin using QGIS in conjunction with (and sometimes even instead of) ArcGIS and MapInfo. I've started setting up some layout templates but have run ...
2
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1answer
264 views

How to synchronize the marker's rotation field with the angular distortion in the map projection

I'm Using QGIS 1.8.0 to plot a global dataset showing the positions of aircraft in flight. The data I have are .csv files with three columns: Latitude, Longitude, and angle of travel. I assign ...
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2answers
61 views

Change precision of Real column

I have a sqllite table which has columns to hold the hectares and acres of polygons but I only want to have two digits after the decimal point - when calculated they have 14! How do I change this so ...