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

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1answer
328 views

Looking for help identifying projections and reprojecting

Hi there at the new forum, I'm still struggling with projections in qgis. The "Vogelschutzgebiete" reprojection worked. But these ones seem to be tougher: ...
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1answer
645 views

How to work with OS map files from Digimap?

I am trying to add map tiles as raster files in QGIS but when I add them they all appear on top of each other. I did this once before and everything was ok but I am now unable to find how to get the ...
3
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0answers
521 views

How to export multiple Shapefiles to one KML file in QGIS?

As the title says, is it possible to export multiple Shapefiles to one single KML in Quantum GIS (Similar to "Map to KML" in ArcMAP)?
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2answers
1k views

Is there a browser/management view in QGIS?

Is there a browser/management view in QGIS 1.8 so that I can manipulate shapefiles and others (such as geo tiffs, etc.) like in ArcCatalog? Maybe a plugin? Right now I have to use my system's file ...
2
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1answer
412 views

Is QGIS suitable for noise modelling?

Hi I've never used any type of GIS software before so I'm trying to find out if it is suitable for what I'm trying to do: I've written a c++ program which estimates ground level noise from a distant ...
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3answers
4k views

How to combine information from raster and vector layers?

in QGIS I have 1 raster-layer (elevation) and 1 vector-layer (administrative units). Now I would like to be able to query one of the administrative units and see the mean and min/max of the elevation ...
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1answer
150 views

I would like to show points moving on a map by date

I would like to create a map where i can see points moving. I have table of points for example with a date column, A 01/01/2012 B 02/01/2012 C 03/01/2012 D 04/01/2012 E 05/01/2012 F 06/01/2012 I ...
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3answers
16k views

How to get the coordinates in Lat/long from a point layer?

Sorry for asking this basic question, but I couldn't get the solution from the previous answers. I need to extract the Lat/long coordinates of the centroids of districts. My QGIS project SCR and the ...
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0answers
58 views

What projection is this [duplicate]

Possible Duplicate: QGIS - Hell of time with CRS and vector intersect The tax assessor parcels layer I referred to in my first post gives this as its projection: +proj=lcc ...
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2answers
314 views

How to Intersect a layer with custom CRS with NED data?

I am trying to create a map with a layer of county tax assessor property parcels plus NED elevation data. The projection of the tax assessor layer is a weirdo -- looks like user-created by the ...
4
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2answers
600 views

Is it possible to generate a vector polygon from a polygon on a raster image?

I have a raster map which I have extracted from a government report providing flood extent return frequencies. I want to 'snatch' these flood extent polygons (i.e. convert to vector) and I was ...
11
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1answer
2k views

How do I build a custom form for entering attributes in QGIS

I've done this many times in ArcGIS and ArcPad but I don't even know where to start building a custom form for data entry in QGIS. I would like to do this for field operations--QGIS would make a good ...
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1answer
245 views

Heat Map to find 10 restaurants, 10 retail, and 10 stores open after 6pm within 3 linear blocks

I would like to find where in the City there is a combination of 10 restaurants, 10 retail, and 10 stores open after 6pm within 3 linear blocks. What is the best way to do this? What data would I need ...
8
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2answers
2k views

How do I layer stack rasters in QGIS?

I have some multi-spectral data, where the individual bands are separate Raster files. How do I layer stack these rasters so that I get one raster with 3 bands instead of 3 different rasters? This ...
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0answers
477 views

How to do Kriging using SDA4PP in QGIS?

I am trying to do kriging using SDA4PP. I have added a delimitted text layer and wish to krige that. When I try I get an error message from SDA4PP as follows... This tool requires at least one ...
6
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3answers
2k views

Are there any issues going back-and-forth between Quantum GIS and ESRI software?

A very simple question. I have very simple work tasks at the office (digitizing) that I would like to be able to work on at home because we are exceptionally busy. I don't want to spend thousands of ...
19
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2answers
21k views

How to access file geodatabase in Qgis? [duplicate]

How does one access data from an Esri file geodatabase in Quantum GIS? I've seen snippets of conversation that indicate it's possible with qgis 1.7+ and gdal 1.9+ but no clear recipe. I recognize ...
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1answer
1k views

Do QGIS Field Calculator xat(n) and yat(n) functions work in version 1.7.x?

I'm trying to use the xat(n) and yat(n) in the Field Calculator but can't get them to work. Does anybody have an example how to use them? I need the start and end coordinates for line segments, does ...
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2answers
1k views

How to handle AutoCAD Map to QGIS workflow?

I’m looking for some assistance and like many here, I am pretty much a GIS novice. I’m working on a project to map our local cemetery (about 40 acres), locating sections, lots, and graves, etc. I ...
5
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1answer
6k views

How can I load .adf files to Quantum GIS?

Is there a possibility to load .adf files to Quantum GIS?
7
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1answer
601 views

How to reset QGIS to 'first run' state?

The title sums it up, I'm trying to reset QGIS to its first run state under Windows 7 and XP. Deleting the .qgis folder in my user directory goes a long way to achieving this, but certain things ...
3
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1answer
533 views

How to create custom markers for QGIS?

Is it possible to define a custom marker as symbolizer for a point in QGIS? I'm looking into using a variation on the "Vector Field Marker" with a couple of arrows pointing at dynamic angles (the ...
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2answers
324 views

How to specify the desired WMS version in Quantum GIS?

How can i set a WMS version of layer which i want to display. I am asking because some WMS addresses are still served via older versions like 1.1.1. In short, I am looking for the equivalent of this ...
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2answers
2k views

How to create heatmap (concentration of points) in QGIS?

There was already a question about it in 2010, where the answer was basically "use QGIS Heatmap plugin". I've also read on QGIS webpage that it is now "implemented as a native C++ plugin" My ...
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4answers
4k views

How to export shape file to SpatiaLite

I have a shapefile with one layer. I can open it with QGis. Now I want to convert this shapefile or layer to Spatialite database. How can I do it? Is it possible to do with QGis?
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1answer
2k views

How to install SDA4PP plugin for Kriging in QGIS?

I am trying to do kriging in QGIS. I have loaded the SDA4PP plug in. Almost all of the items in the SDA4PP dropdown menu are not highlighted and are unresponsive when clicked on - including the ...
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1answer
283 views

Importing a PostGIS and a Delimited Text layer in QGIS, not overlapping

I'm a beginner in QGIS, and I have a PostGIS database and a CSV file I would like to visualize. I followed the instructions in this question and the answers, but it doesn't work for me, my two layers ...
6
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0answers
391 views

Modify default options in QGIS [closed]

I would like to change some default QGIS options. For example, the default font used by QGIS composer on my system is ubuntu. I would like to change that. I would also like to get no border when ...
2
votes
1answer
518 views

Removing duplicate features in PyQGIS

I'm trying to remove duplicate features from PyQGIS. Manually I can do it by using "Edit -> Merge Selected Features" and then "Multipart to Singlepart" from fTools in QGIS, but can this functionality ...
6
votes
3answers
1k views

Select All records in QGIS

Is there a one step operation to select all the records in a layer or dataset in Quantum GIS? I can't find any reference to a single button, menu command or keyboard shortcut to achieve this. I am ...
8
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1answer
1k views

Open software tool or QGIS plug-in to make land cover classification

Is there any tool or plugin for QGIS/GRASS to make an automatic land cover classification from satellite imagery --- based on CLC nomenclature for example? Of course, it will not be 100% sure but it ...
7
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2answers
6k views

Rotating a vector layer in QGIS with qgsAffine (or other method)?

I would like to rotate a set of vector points in QGIS an arbitrary number of degrees around a central point (or arbitrary point). This is similar to a recent question about creating a regular grid; ...
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2answers
839 views

QGIS layers no longer overlay when Enable 'on the fly' CRS transformation is on

My QGIS project has two layers - one retrieved from GADM (administrative boundaries of Guinea Bissau) and another one of the villages collected in the field using GPS Decimal Degrees - D.ddddd. If I ...
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1answer
306 views

Generate a report or table for buffer zone

I have a polygon feature class. I create a buffer for this feature with a distance being 2 km.Now the buffer output intersect with features of the original polygon.So say for instance from the orginal ...
3
votes
4answers
2k views

How do I create a mask where the masked area can be changed by selection?

I'm working on making a mask in QGIS to have one area(county A) outlined while the other areas(counties) are under a semipermeable layer. I already know how to do this for one selected area. But my ...
3
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1answer
579 views

QGIS software Layer Attribute Name Length Limited to 10 characters

In QGIS software, the "vector layer" has "attribute" but the name length is limited to only 10 Characters. Is there any method to name an "attribute" to a longer name? (e.g. attribute name "building ...
7
votes
4answers
4k views

How to change field length in QGIS

I have a shapefile I made in QGIS 1.7.4. One of the fields is a String of length 80. I'd like to make the field accept longer stings, but I can't figure out how to change its length. How do I do this? ...
5
votes
4answers
8k views

Delete points on a polygon using QGIS

I'm new at this, a novice at best. I'm using QGIS 1.7.3. I simply want to select a large number of points on a single polygon and delete them. Is this possible?
6
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1answer
3k views

Calculating distance to points in QGIS

Is there a way of calculating the distance to the nearest points in QGIS? In ArcGIS there is a function called Euclidean Distance, which can take an input vector or raster, and generate a raster of ...
1
vote
1answer
566 views

How to customize grids in Map Composition in QGIS?

Please somebody help me out with Map Composition. In map composer how to put in georgaphical grid (not UTM grid)? And how to put only frame with ticks and annotation (not entire grid across a map)? ...
5
votes
4answers
1k views

Spatial Query from PyQGIS?

Is it possible to reach the Spatial Query plugin functionality in QGIS from a Python script (PyQGIS)? If so, how do I accomplish this? Haven't found any documentation for it, even in the C++ API ...
4
votes
1answer
407 views

How to customize QGIS for vehicle tracking?

I'm doing a project on vehicle tracking using GIS - for that I'm using the open source software package QuantumGIS (QGIS). I would like to know how to customise QGIS using the python console to edit ...
5
votes
1answer
2k views

How to capture a rectangle within the Quantum GIS software?

I want to use "capture polygon" function in QGIS software to draw the indoor office cubical which is a rectangle shape. But the "capture polygon" function is not able to draw a perfect rectangle ...
3
votes
2answers
1k views

How to insert geometries from shapefile into existing table?

I'm running into a problem trying to figure out how I should insert a GIS coverage polygon into an existing table. I'm primarily using QGIS and the PostGIS Manager plugin to handle it. After some ...
3
votes
2answers
595 views

How much information does QGIS's OpenStreetmap Plugin download?

I am using the OpenStreetmap Plugin for QGIS to download the information for my university extent. The information as I see is downloaded in vector format divided into Points, polygons and lines... ...
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1answer
827 views

Integrate QGIS with ASP.NET MVC3

I'm completely new to GIS and i'm trying to work my way into this. My goal is to integrate a simple map created using QGIS with my asp.net web mvc3 application. The main objectives would be to show ...
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votes
2answers
3k views

Is there any tool/plugin for QGIS to easily select feature and edit attributes

I need to select polygons and change some attributes in a shapefile. I'm using Quantum GIS - I select the polygon, open attribute table and edit the attributes I want. I know there must be an easier ...
4
votes
1answer
1k views

Union, Dissolve, Buffer — multiple layers, all in one step?

I'm a new user of Quantum GIS (1.7.3) and I need to repeat a task multiple times, so I'm wondering if there is a quicker way to do the following (with three or more polygon layers - each layer has a ...
2
votes
1answer
352 views

How to query OSM tags by polygon?

I do not know whether something like this is possible but nonetheless. If I understand OSM correctly all objects essentially have associated tags based on type of object (street, building etc) ... ...
6
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2answers
3k views

how to create a new postgis database for usage with QGIS under windows

After installing postgresql with postgis under windows xp I have 3 databases: postgis postgres template_postgis now I try to create a new spatially enabled database in pgAdminIII: I select ...