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

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3
votes
1answer
449 views

Calculate Point Angle in QGIS

I was wondering if there is a plugin, or a field calculation in QGIS to calculate a points rotation angle. ETGeoWizards has a tool that allows you to calculate a point layer rotation angle from a ...
2
votes
1answer
453 views

How to add ocean_basemap in QGIS ?

Has anyone added the Ocean Base map to QGIS? I was able to add the Open Layers plugin and get the "land" basemap (among others), but not the ocean. Thanks, Mike
10
votes
1answer
5k views

Merging adjacent polygons in shapefile that has been split at tile boundaries?

I'm currently using building data from the Ordnance Survey Vectormap District and I've noticed that a lot of building polygons are split in 2 because of the way the OS split up the shapefile. This is ...
1
vote
2answers
357 views

ESRI State Plane Coordinates as EPSG

I am working with some State Plane projections from Colorado. I have looked them up on spatialreference.org and they are the following: ESRI:102254: NAD 1983 HARN StatePlane Colorado Central FIPS ...
3
votes
4answers
167 views

Combining UK OS Historic Digimap Tiles

I'm assisting a retired user in combining a large number of raster tiles downloaded from Historic Digimap http://edina.ac.uk/digimap/description/historic_overview.shtml into one project in qgis. I'd ...
1
vote
1answer
133 views

How to reproject base layers in QGIS once open layers are removed?

I recently discovered the wonders of the osm maps. however now all my projects have all gone curved. is there a way to go back to how they were set originally. opposite to this question: How to ...
7
votes
2answers
427 views

How to create something similar to GDB in QGIS?

I used to work with ArcGIS. There I had geodatabases in which I could store several shapefiles with defined layer styles. Is there a way to do something similar with QGIS? The background is: we are ...
2
votes
0answers
201 views

Using QGIS with EPSG:404000

I'm using QGIS with a flat-world approximation dataset and for my specific use, geometric coordinates on a 1 unit = 1 metre scale are perfect. Unfortunately, QGIS doesn't have EPSG:404000 built-in, ...
2
votes
2answers
307 views

Looking for a QGIS Architecture Diagram

I would like to know the architecture of QGIS: relationships between QGIS and other open sources, and what elements are implemented in the QGIS. Usually, There is a diagram showing the architecture ...
4
votes
2answers
698 views

Splitting DXF layers into Shapfile layers in QGIS?

When i load a dxf into QGIS all the layers are present in the attribute table. Is it possible to split this "entities" layer in QGIS into its component parts and save each component part as an ...
4
votes
2answers
196 views

How to create a colormap where colors diverge at value 0 in QGIS?

I calculated a raster as difference of two other rasters. Now I want to create a colormap where one colour represents negative values and one colour positive ones. The two colours should become ...
2
votes
1answer
1k views

find polygon corner coordinates

I am trying to get the coordinates of each node of the polygon I create. I would like the attribute table to display the name of the polygon (ex. address) and then the coordinates of the nodes (ex. ...
1
vote
1answer
314 views

Desktop client symbolozing a WMS layer by sending SLD to the WMS server?

Objective is simple: finding 'desktop software' (such as ArcGIS, QGIS, etc) that can load a WMS layer, and then send its own SLD to apply to the WMS server in order to get the WMS layer back with the ...
1
vote
1answer
344 views

Problem connecting to localhost PostGIS

When I try to connect to a small localhost PostGIS database using QGIS, I get the error message: FATAL: no pg_hba.conf for host "fe80::4528:3236:418a9e7b%10" user "postgres", database "nyc", SSL off ...
0
votes
0answers
126 views

importing data (weighted average) from a shapefile from another shapefile

I am new to GIS and hope this is not too basic. I am using QGIS. Say I have two shapefiles: SHP1, with attributes allocated to municipalities, and another shapefile I built from a wkt file, SHP2, ...
0
votes
1answer
499 views

DXF created by QGIS crashes Autocad [duplicate]

This is slightly complicated. I have a dxf created by autocad which seems to have been corrupted. It will not open in AutoCAD. However, it opens in QGIS. I tried selecting the file in QGIS and ...
2
votes
2answers
2k views

Can I create a TIN from contours lines (shp) in QGIS?

I need to do a slope analysis, and would like to make a TIN from 2m contours lines. Or do a slope analysis directly from contours? The only DEM available is not precise enough. I do not have any ...
4
votes
1answer
300 views

QGIS - Add a combobox to a toolbar

Is there a way to add a combobox to a toolbar for QGIS? So far I can only find examples that add buttons. I found this tutorial which seems to explain how to do this with general PyQT but haven't had ...
0
votes
0answers
110 views

Toggle editing layers

I search one plugin that alows start an editing session aplied to some layers from postgis connection at the same time as we can in ArcGis?
0
votes
2answers
744 views

Digitizing from OpenLayers Plugin in QGIS, or create raster?

Is there an easy method for digitizing from a layer added from the OpenLayers pluggin. As i cannot snap to it or use it as raster so the entire map does not load? two separate issues there.
2
votes
1answer
2k views

How to get Shapefile point coordinates into .xls?

How can I get just Coordinates (in a file) from point features (shapes) without big hussle. Something like Shape to .xls, with distinct coordinates? I want to use this coordinates immediately, so GPX ...
0
votes
1answer
988 views

Adding .e00 data into QGIS

I wonder if anyone can advise me on how to go about adding .e00 data into my QGIS project. I'd be very grateful for any advice, or a hint on where to find it. Thanks TVZ
0
votes
0answers
64 views

Why can't I “Add label columns to attribute table” etc. in QGIS 1.9?

Why can't I "Add label columns to attribute table" and why can't I use "Letter spacing", "Word spacing" and so on? I have a shp-file. QGIS version 1.9
7
votes
3answers
1k views

Elevation profile 10 km each side of a line

How can I get an elevation profile for a band of terrain? The highest elevation within 10 km (on each side of the defined line) should be taken into account. I hope my question is clear. Thank you ...
0
votes
0answers
60 views

Points in polygon stops processing at 0% Any ideas how to fix it?

I downloaded QGIS yesterday. Today, I tried to do a "Points in polygon" analysis, and it stopped working. It was working earlier today when I did it a couple times. Now, when go to do one: I click ...
1
vote
0answers
48 views

Handling save event in QGIS

I have managed to load QgsVectorLayer from PostgreSQL and add it on the map. Is possible to trap save event after editing, do my own saving, call layer refresh and in this way prevent from default ...
1
vote
0answers
184 views

How to handle mmqgis geocoding IOError: [Errno socket error] [Errno 101]?

I try to geocode a .csv file with QGIS + mmqgis plugin. But, since some days the plugin always crashes. I tried it with QGIS 1.8.0 on an Ubuntu 11.10, OSGeo-Live v6.0 (which is Xubuntu 12.04.2 LTS) ...
7
votes
4answers
564 views

assign and move centroids to their polygons

I m using QGIS 1.8 Lisboa. After calculating the centroids from a polygon shapefile, if some of them lie outside the polygon outlines, I'd like to move them on the polygon they came from. The ...
3
votes
1answer
81 views

Legend title in print composer with different font styles

I want to design a layout with print composer where the legend Title has two different font styles in one e.g. " I had it once but can´t remember". I would be grateful for help.
1
vote
0answers
51 views

Add regular points to each polygon in QGIS [duplicate]

Possible Duplicate: assign and move centroids to their polygons I'm trying to find out a method to define a unique ID based on specific coordinates for each polygon of a shp. The problem is ...
1
vote
1answer
243 views

netCDF does not display properly in QGIS 1.8 [closed]

I have a netCDF file of fire emissions on a regular grid of 12 km by 12 km grid cells with 200 east-west grid cells by 161 north-south grid cells centered on the continental United States. The map ...
2
votes
0answers
233 views

How to import PostGIS layer with geography type to QGIS?

I tried to import in QGIS a layer from a PostgreSQL table with a geography type column created through the extension PostGIS. I noticed that QGIS doesn't seem to like the geography column... Here ...
3
votes
4answers
196 views

Place image without using points in QGIS

I am trying to find a GIS software that does this, so I am trying QGIS but other suggestions are welcome. I have a basic shp boundary such as a rectangle. I want to be able to import an unreferenced ...
2
votes
1answer
110 views

How to get a list of all projections that are currently available in QGIS via the PyQGIS-API

i'm building a QGIS-Plugin and i want the user to choose a CRS out of a combobox in which the coordinates he would enter into some textfields are represented, so these can be converted into another ...
1
vote
3answers
1k views

Exporting 2 shp layers to geojson using quantum GIS

I will explain with an example: I have 2 shp files for Tanzania. Tanzania inland waters http://www.diva-gis.org/data/wat/TZA_wat.zip Tanzania administrative boundaries ...
3
votes
1answer
155 views

QGIS not creating new profiles correctly

QGIS 1.8 is not creating new profiles correctly under Documents and Settings. QGIS support files are also missing in My Documents for newly created profiles. I just tried to copy the missing files ...
7
votes
1answer
362 views

Calculating Maximum Distance from Centre of a Polygon to the Boundary of a Polygon

I have a polygon ready in QGIS. What I want to do is to calculate the maximum possible distance in kilometres from the centroid of the polygon up to the boundary of that polygon. I need two things: ...
0
votes
1answer
194 views

Why are layers not overlapping to each other inspite of having same CRS? [closed]

I am new to QGIS and working with QGIS 1.7.3 version, I have my all layers in WGS 84 CRS but even though they are not overlapping to each other, What should I do ?
6
votes
1answer
232 views

how to aggregate the rates, represented by points, within X radius

the point represents rates like 10%, etc. (this was also pretty clear from 2 years ago) -- been trying to do this for 2 yrs... the points dont represent numbers of events since they are rates ...
1
vote
2answers
390 views

Where are Print Composer Template files stored?

When I saved my Print Composer template, I cleverly navigated to a logical (to me) folder among my documents to save it. Now I find that it does not show up on the list of Composers under “File”. Can ...
3
votes
1answer
140 views

How I can incorporate results of histogram stretching into georeferenced image?

I have one channel 8 bit raster and when I open it in QGIS with histogram stretching "on the fly" it looks fine. How I can recalculate original raster accordingly changed histogram?
4
votes
1answer
305 views

How can I Enable Google Earth 3D features in QGIS?

I want to ask if there is any plugin or any other way where I can use Google Earth features in QGIS. When I'm saying Google Earth features I mean to be able to see roads, towns, etc and to be able to ...
2
votes
2answers
192 views

Does QGIS georeferencing set to magnetic or grid north for British National Grid?

I have just been georeferencing a map on QGIS using British National Grid and it is not lining up with the vector maps I downloaded from OS. I used the 'From map canvas' option and used 'Linear' ...
4
votes
3answers
2k views

How to extract raster values and create new raster in Qgis?

I want to extract certain values of a raster image in order to create a new raster which then should only contain the extracted/chosen values. How to do this in QGis?
2
votes
1answer
174 views

Inland / crater watershed delination

Even though watershed delineation is a quite popular matter here, I have what seems to be a somewhat unusual demand. I start with a DEM which is constituted of a series of craters, all centered on ...
1
vote
0answers
101 views

Problems with the scalebar not CRS related in QGIS

When I add one layer to the map, open it in the print composer and add a scale bar the scale bar is fine. I can add layers (with the same CRS) and everything is fine. Once there are two layers in my ...
6
votes
1answer
583 views

Is it possible to conduct a flood model analysis with QGIS using a DEM?

Is it possible to conduct a flood model analysis with QGIS using a DEM? Need to simulate rising water levels on a 250k map.
1
vote
4answers
452 views

How to create internal polygon without overlap on QGIS1.8.0

I would like to create new polygon inside the existing polygon. It does not means donuts polygon. I would like to have two polygon without overlapping. I can create if I don't check "Avoid ...
5
votes
1answer
325 views

Is it possible to put scale(ex; 1:10000) at print composer on QGIS 1.8.0

I would like to display a cartographic scale (e.g. 1:10,000) in the print composer. I can set the scale from map tab. After setting, I can type by myself as Label. Is it possible to put scale ...
15
votes
4answers
346 views

Is the term “Quantum GIS” trademarked?

We need to link to Quantum GIS on a major official website. My legal department asks me if "Quantum GIS" is trademarked. Is it? Thanks -- Alex