Quantum GIS is a user-friendly, cross-platform GIS application licensed under the GNU General Public License.
0
votes
1answer
20 views
Running a script with QgsFeature from within the console
I am trying to run a script from the QGis Python console (similar to: http://spatialgalaxy.net/2012/01/27/qgis-running-scripts-in-the-python-console/)
The line feat=QgsFeature() operates fine from ...
0
votes
1answer
34 views
How to rotate (svg) symbols in QGIS map composer to match map rotation?
Because of my thesis layout requirements, I have to rotate 270° some of my maps in composer.
There are (many) svg smbols (icons), and they are rotated as well.
I would like to (non-)rotate them in ...
1
vote
0answers
31 views
Is it possible to integrate the mapping capabilities of QGIS with Stata?
I was wondering of the possibility of integrating the mapping capabilities of Q-GIS with Stata, by using the programming aspect of Stata as opposed to using R or python.
Is this possible?
0
votes
2answers
75 views
Multi-Band (RGBA) into single band raster
I have the raster which contains 4 bands (RGBA), which ilustrates the pupulation (traffic) density. I want to convert it to the simple gridded ascii, however I'm getting in the trouble when I try the ...
1
vote
0answers
17 views
How to align QProgressBar label in QGIS messagebar? [migrated]
Unable to align the QProgressbar label in Qgis Messagebar. see the image below
While progressbar is updating,the label is vanished. so i tried the alignment for progressbar as shown below but its ...
0
votes
0answers
13 views
MapInfo8.0 is not letting me edit layers imported from the server? [duplicate]
I have imported 4 layerts from my server for use in MapInfo, when i went to edit these layers the edit tool for each of these layers is grey and non accessible.
Any suggestions would be greatly ...
0
votes
0answers
28 views
interaction Between qgis and .ui and PyQt
I am working on project of python (PYQT) and i have to developp some classes in python (POO) that could add some function to the Controls of QT Creator for Qgis other wise the file .ui so for example ...
0
votes
1answer
101 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 ...
1
vote
1answer
39 views
saga & grass configuration in sextante (ubuntu)
I have some trouble in running saga and grass algorithms in sextante. When I double click it appears a pop-up saying:
Missing dependency.This algorithm cannot be run :-(
This algorithm requires SAGA ...
0
votes
0answers
27 views
basic statistics in qgis lisboa doesn't work under shapefile
When I add csv file and the basic statistics works well, after I save it as shapefile, and the basic statistics doesn't work properly under shapefile, why?
0
votes
2answers
56 views
Find and list all polygons that overlap with another polygon
I am working with two polygon layers which overlap but are unrelated (one is congressional district boundaries, the other is MPO area boundaries).
I would like to generate a list of all the ...
1
vote
0answers
56 views
How calculate areas between certain contour lines in qgis?
Sorry for asking a question which I found in similar ways already here, but I am trying this for days and just got no result:
How do I calculate the area between certain contour lines (e.g. 0-800, ...
1
vote
1answer
29 views
how do i assign values to shapes to be displayed in my map
I apologize for the simplistic nature of this question, I'm VERY new to QGIS. I'm trying to use QGIS to display political information. I have a map of my state, with each town as it's own shape. I ...
-1
votes
1answer
59 views
QGIS and Python - create line with multiple points in postgis
How can I create a line, with Python functions, with many points that are records in Postgis?
Thank you
-1
votes
0answers
19 views
how to create a wasp .map file in Qgis from srtm data [duplicate]
how to create a wasp software .map file in Qgis from srtm data?
1
vote
0answers
42 views
Looking for best practice to connect multiple road vector line layers for routing (pgRouting) purposes
The Data I have:
Bridges (line layer)
Municipal_roads (line layer and does not include information in Bridges)
State_roads (line layer that doesn't include Municipal_roads or Bridges)
Question:
...
0
votes
1answer
31 views
Why am I unable to save a user defined Coordinate system in QGIS 1.8 on Win8?
I have installed QGIS 1.8.0 Liboa under Windows 8.
I have to create a user-defined Coordinate system.
When I click the Save Button, the Program does not save.
Question:
Is it an administration ...
10
votes
2answers
249 views
What's the relation between QGIS and GRASS?
I have been working with GIS and remote sensing in an university and professional environment some ten years ago (ArcInfo etc), so I have some experience even though somewhat outdated
Right now I am ...
1
vote
1answer
196 views
'Couldn't load PyQGIS' after upgrade to Raring Ringtail?
I upgraded my Ubuntu to Raring Ringtail.
After that, when starting QGIS I receive a message:
Couldn't load PyQGIS.
Python support will be disabled.
Traceback (most recent call last):
File "", ...
0
votes
2answers
74 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 ...
0
votes
0answers
15 views
How to correctly create virtual catalog from rasters with overlapping alpha band in QGIS?
I'm trying to make a mosaic (and then a pyramid) of historic map tiles.
Every map tile has a border, I got rid of it with gdalwarp (adding an alpha band and specifying the border, as I stated here).
...
-4
votes
1answer
83 views
How to digitize a map in QGIS?
I am relatively new to QGIS and using it on windows vista.
Problem:
I have to digitalise an aerial map and then extract the coordinates.
I have absolutely no idea how to start
Thanking you in ...
1
vote
1answer
67 views
Watershed Analysis using DEM [duplicate]
I stumbled upon your question regarding the mosaic feature in qgis, the thing is I'm also using Quantum and this is my first encounter with GIS this semester, so if you can please help me with a ...
0
votes
0answers
30 views
QGIS GDAL polygonize - how to set scale
I've got some old contour plots, paper copy only, that I'd like to be able to put into QGIS. I get as far as a successful polygonize into shp and it looks fine, but the scale is wrong. How might I ...
1
vote
0answers
45 views
Hypothetical Cost Saving Question: EPA Proprietary v Open Source
I am writing a paper for my GIS MSc and trying to justify a move for the EPA from proprietary GIS software to open source (QGIS).
Can anyone hazard an educated guess as to how much ArcGIS would cost ...
0
votes
1answer
53 views
AttributeError: HelloWorld instance has no attribute 'connect'
Here's the code:
import sys,os
import win32api
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *
import ctypes
from PyQt4 import uic
class HelloWorld:
def ...
2
votes
0answers
66 views
ArcGIS Raster Calculator VS QGIS Raster Calculator
Are there any major differences between ArcGIS Raster Calculator and QGIS Raster Calculator?
1
vote
2answers
67 views
How can i mark movement route to the map with QGIS?
I am beginner with QGIS and i am having problem with marking movement route to the map. So i would like to ask how can i mark movement route to the map with QGIS. I have a list of cities and i have to ...
0
votes
1answer
47 views
Give Properties to a shapefile to be used by another person [duplicate]
I have bedrock geoology data. I want to classify the data so it appears with the same propeerties as it does on the suppliers website.
Is there a way i can attribute a property to a layer (in this ...
0
votes
2answers
49 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 ...
1
vote
2answers
64 views
Identify points near roadside in QGIS
How do I create an attribute list from points that run along roads in a shape file containing road data? The points don't intersect the road centre lines and are not consistent in their distance from ...
2
votes
1answer
48 views
Merge attribute data using spatial query in QGIS
I have 2 vector layers that I wish to correlate attributes - a shape file containing boundary polygons and a shape file containing point locations.
I'm using the vector>spatial query tool to generate ...
3
votes
1answer
66 views
Filter contour lines in QGIS
I have a shapefile of contour lines, with an ALTITUDE attribute with the height ASL in metres. The source data is in 0.5m intervals, but I'd like to filter it down so I get contour lines at (for eg.) ...
0
votes
0answers
29 views
Assuming nearest point for a region
I'm mapping agricultural cropping systems in Brazil using QGIS. From satellite images I got an raster file with 5136 x 5136 pixels from my field work.
Now I need to associate many soil/climate ...
0
votes
1answer
38 views
Cant Instal psycopg2 on mac 10.8.2
I know there Have been a lot of similar questions asked but none address this issue as I far as I can tell. When I am trying to install the sextante plugin, or run PostGIS Manager in QGIS I receive ...
0
votes
0answers
43 views
how to create Euclidean Distance in QGIS
I'm trying to create distance layer for points in QGIS (similar to Euclidean Distance in ArcGIS).
I see the answer you give in the url
Calculating distance to points in QGIS
I try it using rasterize. ...
2
votes
0answers
47 views
Installing knn on PostgreSQL for windows
I am trying to install the extension KNN for clustering as an extension on my PostgreSQL database.
I have downloaded the file
http://www.pgxn.org/tag/analysis
I found instructions on how to ...
0
votes
1answer
52 views
How to set Marker Line symbol for QgsVectorLayer by using Python?
QgsVectorLayer Right click->Properties->Style->Single symbol->click on simple line in tree node ->symbol layer type -> Marker line
Kindly help me to set marker line symbol programmatically by using ...
0
votes
0answers
28 views
Is there free desktop WFS client with BBOX support?
To troubleshoot WFS server (geoserver) with big dataset (global OSM btw) I have tried number of free GIS desktops which work on Mac: QGIS (1.8, 1.9dev), uDig, gvSIG - none of them seems to support WFS ...
0
votes
1answer
54 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 ...
0
votes
0answers
31 views
How to add attribute from analysis to database mySQL?
I need to prepare a GIS for a customer. They insist to use a MySQL-Database (not the best option, I know). They need to digitize some geometries (areas) and add some attributes. The geometries and ...
1
vote
0answers
57 views
QGIS: Different projection result for on the fly and transformation
I am a bit confused about the result of a re-projection/transformation of a raster in QGIS 1.8 (Lisboa).
WGS84 to WGS84/UTM34N. When I use the 'on the fly' transformation the resulting raster has a ...
5
votes
1answer
121 views
How to implement Spatial Autocorrelation using QGIS or PostgreSQL (or any free application)?
I am a total newbie on the GIS scene so I hope this is not a stupid question.
I have two layers in a PostgreSQL database.
The first layer contains points where events happened in Europe.
The second ...
0
votes
0answers
19 views
De facto QGIS projection for EPSG4326 / 'unprojected' reference systems? [duplicate]
This is my understanding of projections/datums:
To get a map of the earth on a plane you need to project the 3 dimensional earth by 'wrapping' a plane around it in the way that suits you (according ...
2
votes
0answers
57 views
How to create stacked bar/column charts in QGIS?
I know that conventional bar charts (with the bars adjacent to each other) based on feature attributes can be plotted in QGIS. But can you please tell me if there's any way to plot the bars in the ...
1
vote
0answers
21 views
Displaying PDF files associated to feature objects location. [duplicate]
Are there any other methods allowing user to display PDF files associated to points feature object other than using Actions function available to QGIS Layer Properties?
I have more than one thousand ...
0
votes
0answers
32 views
Missing SIP Module in QGIS on Debian Squeeze
Python environment is not loading and shows this error:
Traceback (most recent call last):
File "", line 1, in
ImportError: No module named sip
Versión de Python:
2.6.6 (r266:84292, Dec 26 2010, ...
2
votes
1answer
66 views
How to create a date field in QGIS shapefile
When I create a new shapefile in QGIS, I'm presented with the "New Vector Layer" window, where I specify the Shapefile type (Point/Line/Polygon) and am then able to create attribute fields.
I'm only ...
1
vote
0answers
64 views
Why doesn't dissolve finish? It just stops without error message
I have a shapfile of the whole UK that contained Postcode area, district, and full postcode.
I was going to try and dissolve the regions into seperate business areas by joining a lookup table that ...
0
votes
2answers
70 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 ...
