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

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6
votes
1answer
284 views

How do I change an existing srs in QGis?

I am showing postgis data with srid 28992 (Amersfoort / RD New). But when I plot the geospatial data on a map (with openlayers plugin), the data is shown a hunderd meters off because the datum shift ...
2
votes
3answers
351 views

Shapefile with overlapping polygons: calculate average values

I have a very big polygon shapefile with hundreds of features, often overlapping each other. Each of these features has a value stored in the attribute table. I simply need to calculate the average ...
1
vote
1answer
241 views

How to create labels using 2 columns?

I want to label a layer with 2 columns/attributes. It´s not a problem in Mapinfo, but can it be done in QGIS as well?
0
votes
2answers
543 views

QGIS 2.0 won't open on OSX Mavericks [duplicate]

I successfully installed QGIS 2.0 on my macbook running OSX Mavericks, but when I attempt to open the program, I get the following message: "QGIS cannot be opened because of a problem. Check with the ...
0
votes
0answers
45 views

Import processing in qgis 2.0 [duplicate]

I know that this question has already asked but no concrete answer has given!! My environment is Ubuntu 12.04 and I'm using eclipse-pydev as IDE. Thanks in advance for helping me.
2
votes
1answer
283 views

Why are xy coordinates displayed in my WGS84 project instead of lat/lon?

I have a project in QGIS comprised of shapefiles and raster maps. The origin CRSs are mostly on ETRS89 / Portugal TM06. I am trying to convert the project to WGS84 to have lat/lon instead of metric ...
2
votes
2answers
187 views

How can I close the identify result dialog programmatically?

I am trying to close the identify result dialog which appeared when I select to identify a feature from the active layer. Does someone know how can I do it?
3
votes
1answer
67 views

Input field not showing up in Distance Matrix In QGIS 2.0

I tried to perform a Distance Matrix analysis of building centroids. I have a two building centroid layers. The attributes in both the tables are name, osm_id, perimeter and area. In the Distance ...
1
vote
1answer
531 views

Calculate distance of points along a route QGIS

I have a line layer and a point layer, I need the distance between the first and the last point measured along the line. How can I do that using QGIS? Do I need to know linear reference? I don't ...
1
vote
2answers
419 views

QGIS split shp into different layers

I'm building my first map, so please forgive me beginners mistakes. I've downloaded QGIS 2.0.1 and following tutorial I was able to download data from ...
2
votes
0answers
173 views

Is there recommended true type font for search and rescue?

Has anyone run across a true type font set to use for search and rescue cartography, and/or fire cartography? This is specifically for Terrain Navigator Pro which isn't really a GIS application but ...
1
vote
0answers
143 views

Extending “How to add complex Emergency Symbology (TrueType fonts) to QGIS?”

I have used the technique as outlined in How to add complex Emergency Symbology (TrueType fonts) to QGIS? but have run into some difficulty. I have used this technique for a map of water assets that ...
0
votes
2answers
582 views

QGIS 2.0 and Debian Jessie

I added the official QGIS repos to my installation of Debian Jessie using the instructions on the official QGIS page. As of now, there appears to be some packages missing from the repos that resolve ...
1
vote
0answers
11 views

How to display only layers where is my selection in clipper?

I'm using the Raster->clipper plugin to clip raster layers but I've a lot of layer and every time I have to search the right one in the big list in the input raster file. I would like to see the list ...
0
votes
1answer
138 views

Plugin QGIS Error “QTextEdit.setPlainText(QString): not enough arguments”

I try to make save as button but i got this error message when try to save file in my directory File "C:\Users\Mr.Pakde/.qgis2/python/plugins\condition\conditiondialog.py", line 80, in saveAs ...
0
votes
1answer
197 views

How to automatically convert line features into polygons using QGIS/PostGIS?

I have a master table of line features and a number of tables that I use to join (in the SQL sense) to produce various layers. Some of theses layers consist of boundaries of administrative zones ...
1
vote
0answers
42 views

Does map export using GarminCustomMap plugin for QGIS work on Mac OS?

When I try to export a map using GarminCustomMap (1.4) plugin QGIS 2.01 on Mac OS 10.9 quits with no messages. I suspect this might be a Maverick related issue. Is anyone successfully using the ...
0
votes
0answers
125 views

Can QGIS create a “virtual view” from a given position?

I would like to be able to choose a position on a map (by clicking, or by entering an address, or other means -- please suggest) and have an artificial picture created, like what I would see if I ...
5
votes
2answers
216 views

bicycle / bike map road grade markers - semi-automated?

So I'm making a bike commuting map for our area, and one of the features to show (common on a lot of bike maps) is some type of road grade marker. We're planning to show three categories: 'kinda ...
8
votes
1answer
351 views

Where is this raster offset being introduced in the QGIS processing toolbox?

I'm using the (awesome!) processing toolbox in QGIS 2.0 to reclassify some NoData values in a raster from -9999 to 0, but at some point in the process there's an offset of about 0.2 degrees being ...
5
votes
1answer
163 views

How can I get the field index of the new layer in my script using Python?

I am trying to use layer.changeAttributeValue(fid, fieldIndex, value) to add values to a field in QGIS Basically, I'm creating a plugin which will, if a checkbox is ticked, create a new field, then ...
1
vote
2answers
537 views

How to add a new column in attribute table with attribute with indexes of another max-min ordered attribute field?

I've an attribute column named e.g. VALUE with different values I would like to make a column named e.g. ORDERsuch that the greatest value has the attribute 1 the second value 2 etc. etc. so order ...
3
votes
3answers
2k views

How to set all pixels with value <= 0 to “nodata” in DEM raster?

I have a DEM raster with pixel values between about 3000 and -0.0003. I need to set all pixel with a value of 0 and smaler (<=0) to "nodata" (for later raster calculations and to reduce the ...
0
votes
0answers
49 views

List attribute values ​​of selected points in the layer

I need to grab the fields in the layer of the selected points in the order they were selected by the user. My code: Connection to the database and display the map on the screen, everything ok: uri ...
3
votes
1answer
347 views

QGIS not interpreting Lambert Conformal Conic projection correctly

I'm a fairly new user of QGIS and I've run into an issue that I can't seem to solve on my own. I'm trying to work with the NRCan Atlas of Canada Waterbodies SHP file but I'm having an issues ...
0
votes
0answers
40 views

qgis - slope from DEM - errors due to projection and oversimplified 'z factor' [duplicate]

I'm trying to generate a slope raster from a DEM raster. It seems there is a pretty significant error due to the 'z-factor' option. I'm fairly new to this, but some other posts and responses ...
1
vote
1answer
154 views

Save input in plugin as pdf format file

I m trying to make QGIS plugin with plugin builder that compare 2 map scale with Input1 and Input2 as input scale and show recommendation after clicked recommendation button. I wrote my code like ...
0
votes
0answers
72 views

determine the catchment area from dem or hillshade [duplicate]

I want to determine the catchment area of river from hillside. Is there a plugin that I can use in qgis ?
1
vote
1answer
77 views

Is it possible to insert note to remember the info of a project?

Sometimes I need to open an old project, and mostly I remember how it works (i.e. the structure, the formatting and so on) but sometimes not. At other times I open a project composed by a colleague ...
0
votes
2answers
105 views

How to install maps2winbugs for QGIS?

I have got a maps2winbugs.dll file, but what should I do to install it into QGIS, sorry for the first time using this software, doesn't have any experients in C or R.
3
votes
1answer
191 views

How to fill the area bounded by lines in QGIS?

There are two types of area I want to fill color: The areas bounded by a line, such as a building The area bounded by different lines, such as the river I don't know how with QGIS. I only know how ...
4
votes
4answers
1k views

Matching GPS tracks

I'm looking for a proper way to process multiple GPS tracks (so time ordered list of lat/lon points) and match/classify that segments, that are covered by multiple tracks: So it's not about ...
1
vote
1answer
631 views

QGIS 2.0 Python API: Layer vector style loaded from file, marker symbology is respected, labels are not

Im loading a QgsVectorLayer and showing it on map. I load the style i prepared with desktop QGIS 2.0.1 using the layer.loadNamedStyles(path) function in the API and it seems to work, kind of, because ...
3
votes
2answers
223 views

Is there a function to select a region of a map for further processing with Python?

I would like to select a map's region in QGIS for further processing with python console. Ideally I would like to select the region with a mouse drag (like Gimp crop function) and then e.g. analyze ...
2
votes
2answers
518 views

How to create equidistant points in QGIS along a polygon?

I am looking for a solution to distribute with a python script equidistant points in QGIS along a polygon. I tried to use the following code example: ...
2
votes
2answers
65 views

Is there a way to create a new vector layer from a template?

I would like to be able to set up a template for a vector layer with a standard set of attributes rather the having to specify them time. Similar to SQL "CREATE TABLE blah LIKE foo" Is this ...
3
votes
1answer
141 views

Rasterlite db with multi table

When working with Spatialite DBs, I can store multiple tables in single DB. But now I want to store multiple raster tables on a single Rasterlite DB. I tried QGIS for conversion but it converts only ...
2
votes
0answers
199 views

How to merge points (bus stops) in QGIS manually or programmatically?

What I have: I have a large data-set containing links (bus routes( (>2000) and their respective nodes(bus-stops) (>6000). The data set I received from the local bus operator is very messy. It ...
1
vote
1answer
232 views

How to add a DEM Band to an existing 3-band TIFF file using QGIS?

I'm quite new in the GIS business and I do not figure out how to do the following thing: I have two geoTIFF Files, one is a 3+1 bands file (RGB+alpha), the second one is a DEM geoTIFF file containing ...
2
votes
1answer
151 views

graduated labels in QGIS

I've searched on Google but haven't found an answer. The QGIS Dufour GIS provide an enhanced vector-styling interface but is it also possible to graduate the labels like it is possible for the ...
0
votes
1answer
86 views

Create Area or Polygon based upon a Series of points

i have a large list of points that i would like to merge to create an Polygon based upon an attribute. Essentially an area that encompasses all points. x | y | attr ____________________ 1 | ...
7
votes
1answer
521 views

How to remove trailing zeros from QGIS Graduated Style Class labels?

I'm sure I've seen a solution to this before but now I can't find it. When using the graduated fill style in QGIS I get lots of trailing zeros in the labels. This makes my legends look messy in the ...
1
vote
2answers
4k 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
171 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
98 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
92 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
173 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
156 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
514 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 ...