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

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82 views

Python to get ids from shp dont return all records

I have some Python code to get the ids and georeference from a shapefile: canvas = qgis.utils.iface.mapCanvas() allLayers = canvas.layers() nos = QgsFeature() for i in allLayers: if ...
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1answer
93 views

How to convert geometry of SHP to decimals

I try to create a line with two points. These points are obtained in a SHP layer. How can i convert that points to decimals? Thank you
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1answer
71 views

trace a transmission line for a certain distance

I’m looking for a way to easily trace a transmission line for a certain distance. Here is the scenario that I am working with. We have an issue with our transmission line; our OMS tells us that there ...
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1answer
120 views

QGIS Python - Convert geometry from Postgres to QgsPoint()

I have made a query in Postgres to get some points to use with python. This points are in geometry data. How can I convert that geometry in decimals to use QgsPoint() in python? Thank you
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1answer
269 views

Nearest neighbor analysis not showing results

I'm trying to do a nearest neighbour analysis on fish shoals distribution. I go to Vector > Analysis Tools > Nearest neighbour analysis. I choose the appropriate layer and when I hit ok the black ...
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1answer
201 views

Check if layer is a QGSVectorLayer from Python Plugin within QGIS

I am trying to extend some concepts in the QGIS Workshop tutorial. Basically, I would like to check if the layer is of type "QGSVectorLayer". In the QGIS Python console, I am able to type canvas = ...
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1answer
768 views

Producing NDVI maps in qGIS

I'm trying to produce a simple NDVI map in qGIS using a Macbook pro (2011) from landsat raster images. I've tried using the 'Measuring Vegetation' plugin, but for some reason that goes absolutely ...
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1answer
239 views

CSV and GDAL 1.10 in QGIS

It seems the GDAL upgrade from 1.9 to 1.10 changed the way CSV files are handled so that I now have a non-functioning QGIS. App hangs trying to import csv data file when previously had no problems ...
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2answers
183 views

Emergency Services: How to optimize routing by measured travel time?

I would like to optimize the service areas / catchment areas for an emergency service. Therefore, I have several measurement points on the streetmap, where people have stopped the travel time from ...
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2answers
180 views

How to select polygons in polygon and export to CSV?

I have two polygon layrers, each layer a table in PostgreSQL: One layer with polygons areas in a city. Another layer with buildings (polygons) that are within areas. How can I to do to know what ...
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1answer
175 views

“Request contains a format not offered by the server.” Error when using CRS transformation with WMS in QGIS

When I try to load a WMS layer which has a WSG84 as a default projection and use a CRS transformation on it, it gives this error message: Request contains a format not offered by the server. The WMS ...
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2answers
195 views

How to make line with arrow head in QgsVectorLayer using python?

I need to draw line with arrow head or after drawn the line i need to make it as arrow head line by using python. or can we set any arrow head symbol for line features by using python? Kindly help me ...
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1answer
182 views

QuantumGIS EPSG:3857 doesn't match with leaflet

Leaflet documentation said that they has EPSG:3857 as default projection. Using QGIS with open layer plugin, I point to a location to find it's coordinate. I used EPSG:3857 in QGIS as well. The ...
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2answers
564 views

How to restore the original Settings Menu in QGIS 1.8 (customization)?

Making some tests in Windows XP for customizing a user interface in QGIS 1.8 (see http://www.duif.net/qgis/doc/output/html/en/docs/user_manual/introduction/qgis_configuration.html#customization), I ...
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1answer
69 views

Reuse same style settings for chloropleth maps based on different datasets

I am new to QGIS. I have been using MapInfo for a couple of years, but I am considering to switch to QGIS. So far I like it, but there are some things that I haven't found out yet. I want to make ...
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1answer
91 views

Can pgRouting work more efficiently?

I use a river network on which has a lot of nodes to test pgRouting, and I run the SQL, searching for the shortest path between nodes. SELECT * FROM shortest_path(' SELECT gid as id, ...
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2answers
177 views

SAGA, GRASS Raster values to null

I want to make the cells which values "1" to null in QGIS with Grass or Saga tools (exactly Saga).
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1answer
71 views

Is it possible to export an image that can be zoomed-in on?

I am using QGIS on a Mac. I would like to export my map so that the viewer can zoom in on it, just as I view the map on my QGIS canvas. I am not sure how to word what I want. If you see the map ...
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1answer
150 views

Sextante grass folder incorrect?

What is the correct grass folder in Sextante? I alway get this message: The specified GRASS folder does not contain a valid set of GRASS modules. Please, go to the SEXTANTE settings dialog, and ...
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1answer
188 views

qgis plugin: “WindowsError: [Error 6] The handle is invalid”

OS: Windows 7 64bit GIS: QGIS 1.8 (qgis.org/downloads/QGIS-OSGeo4W-1.8.0-2-Setup.exe) path variable: GISBASE=C:\Program Files (x86)\Quantum GIS Lisboa\apps\grass\grass-6.4.3RC2 ...
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2answers
135 views

How to handle adding a PostGIS layer in pyQgis without saving password?

I'm writing python plugin and trying to find the right way to add PostGIS layer on the map without storing user password. After adding layer on the map, I strip out the password from uri like this: ...
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2answers
1k views

How to convert Shapefiles to 3D DXF?

I'm using QGIS version 1.8.0-Lisboa and I'm trying to convert a vector line file and it's not working. I right click on the layer>Save as>Autocad file>DXF. After that I try to open the output file in ...
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1answer
99 views

problems about setting pgrouting with QGIS under windows

I followed this website:A Beginner’s Guide to pgRouting and now facing some problems. I finished steps before "Creating a routable road network", and open QGIS 1.8, click the PostGIS Manager plugin, ...
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1answer
201 views

matching a border of one polygon to another [duplicate]

I have a polygon (A) that I drew the eastern border of in QGIS. I have another polygon(B) whose western border I want to nest against the eastern border of polygon a so they are touching but not ...
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1answer
127 views

Problem with encoding of CSV and SHP files in Linux

I am new to using QGIS. I came up against the encoding issue of shp files. This solution to solved my problem in Windows (for source I had to put windows-1253 instead of utf-8) My question is what ...
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1answer
131 views

Split Map using Python in Qgis

I have a map, in which each region is defined as an attribute of the map (I can select each region from the attribute table). I am trying to create new layers each one containing only 1 region using ...
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2answers
230 views

Calculating area gets a different result

I've calculated the area of polygons with QGIS by using ctr-i - geometry - $area. I've set it on real. The results seem fine, but I've noticed they differ from the area given when I use the ...
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1answer
85 views

QGIS: put vector values into separate layers?

QGIS 1.8.0 Mac: I've got a polygon shape file with values 1-5 in it i.e. contours. How do I get the polygons for value 5 into one layer, 4 into another... so I can assign each a colour and see them?
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1answer
44 views

How to use classified styles with joined layers?

I am trying to set a color range based on this tutorial In LAYER PROPERTIES for "new", in JOINS, I have joinlayer - data-join joinfield - GEO_ID2 targetfield - GEOID10 Where "new" is my shapefile ...
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votes
1answer
121 views

PostGIS Manager Load Error [duplicate]

I am using the PostGIS Manager Load data to PostGIS tool on a Windows install and am getting the following error: Something's wrong: ["'shp2pgsql' is not recognized as an internal or external ...
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1answer
172 views

qgis how to assign a field to map tips

I am a beginning user of QGIS 1.8. I cannot find the way to assign a field to 'map tips'. There seems to be no way in 'properties' of the layer to do so.
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1answer
86 views

What could I do to make QGIS find all the plugins?

I'm starting to use Ubuntu 12.10 and would like to get my QGIS running on it. Installation was fine but when I tried to add a package called Points to Paths the Plugin Manager was unabled to find it. ...
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1answer
217 views

CRS is UTM 51, the coordinates are shown in meters, show same coordinates as lat long as well?

We are working with a CRS of UTM 51N, the Philippines. The coordinates under cursor are shown as metric values. Clients however like so see the Latitude Longitude values when they move the cursor. Is ...
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1answer
180 views

Using Easy Custom Labeling: Where's my missing label?

I’m using the Easy Custom Labeling plugin (with QGIS 1.8). I have one feature label which refused to show itself. It’s just not visible. When I look at the attributes table, the feature name appears ...
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2answers
70 views

How to align directions of connected lines?

I have a vector line made of different pieces of lines with different directions. I merged the lines to one. But this merged line still have different direction in its "invisible" parts. I want to ...
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1answer
140 views

Cadtools getting the distance in meters

While doing the parallel line method by using the cadtools its asking the distance in meters but i need the parallel in feet values(I need to enter the distance in feet values). currently we are using ...
0
votes
2answers
111 views

loading CanVec directory full of .shp files

I'm totally new to QGIS, and trying to view a Canadian Topo map as published on an iMac - I don't want to change it. ...
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votes
1answer
156 views

Postgresql on Ubuntu Server and QGIS [closed]

Complete newbie... I taught myself the basics of GIS on the job with ArcGIS 9.3. I have been plating with QGIS and have gotten the basics down on both. I am not well versed in the terminology related ...
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votes
1answer
238 views

Using macports python 2.7 with macports qgis

I installed qgis through macports on my mac running OSX 10.8.2 but when I run the application (qgis 1.8) it says that I don't have python-gdal installed. I searched google and it appears that it is ...
0
votes
1answer
421 views

how to install networkx python in QGIS

How to install and how to compile networkx python on QGIS? I always get an error that no module named networkx in the console of QGIS I copied the file networkx in C:\Program Files\Quantum GIS ...
0
votes
1answer
69 views

gdal_contour creates an empty shapefile

I am running: gdal_contour -a elev hazard_interp4.asc haz_ak_contour_4_10 -i 10 the hazard_interp4.asc file has values in band 1 (singel band gray). With the above command, I get a shapefile that ...
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1answer
118 views

Is it Possible to Convert a GRD File into an ASC File in QGIS?

Is it possible to convert in QGIS a GRD file (that was created in MapInfo) into an ASC file (that can be imported into SAGA)? Is it possible to "extract by mask" a section of a GRD file in an other ...
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1answer
279 views

How to fix AttributeError: 'QgsVectorLayer' object has no attribute 'provider'?

When I try to start this algorithm I get an error: Traceback (most recent call last): File "C:/Users/trdina/.qgis//python/plugins\sextante\core\GeoAlgorithm.py", line 145, in execute ...
0
votes
1answer
55 views

Is it possible to download GPX another coordinate system except WGS(GCS) with GPS Tool on QGIS1.8.0?

I got GPS data with using bessel1841 as coordinate system. When I download GPX data on GPS tool, it is automatically treated as WGS84. Can I use another coordinate system when I download GPX on GPS ...
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2answers
306 views

How do you use 'reclass' in GRASS?

It could be user error, but for some reason, the reclass tool is just hanging and hanging... QGIS 1.8 Compiled against GDAL/OGR 1.9.2 Ubuntu 12.04.1 Running the tool from the Sextante toolbox Input ...
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votes
1answer
470 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 ...
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1answer
83 views

Alternate option for a Data Player plugin for GPS in qgis

I found a plugin for QGIS to play a GPS Track. (Data player plugin).The Problem is I can not read .gpx File with this plugin. Is there another option?
0
votes
1answer
117 views

Joining intersected polylines using rules based rendering [duplicate]

Possible Duplicate: Setting rendering order of line layers in QGIS I have trouble getting two intersecting polylines to look like they were joined at rendering. I am using rules based ...
0
votes
1answer
232 views

How do I add a Corel Draw map as .dxf file to QGIS and how do I georeference it?

I have a vector data map of Poland, which I exported from Corel Draw. I can display the map in QGIS. At first the boundaries and subdivisions are only displayed as lines, after saving the data as ...
0
votes
1answer
247 views

Error running mapserver export in quantum gis

I have a project in Quantum GIS that I need to export to a .map file using de plugin mapserver export. I fill all the forms but I get this error when running the app. Any ideas of what is ...