Quantum GIS is a user-friendly, cross-platform GIS application licensed under the GNU General Public License.
0
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0answers
40 views
QGis 1.9.0 browser crash [closed]
I installed QGis 1.9 dev from OSGeo4W on a Win7 machine. I can open the Quantum GIS Browser but, as soon as I click on a drive leter (on the left panel) or a shapefile, I get a message that the ...
1
vote
0answers
56 views
How to get Lon/Lat values from the postgis raster type column
I have a tiff raster in my PostGIS 2.0 database. I want to get the value lat/lon and extra data like temperature from the raster type column in postgis table.
I want the table with columns ...
0
votes
1answer
28 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 = ...
1
vote
2answers
59 views
How do I set the working directory in QGIS?
I'm learning QGIS and lovin' it. But one thing that annooys me a little is is that each time I want to save data, the default directory is the QGIS folder under Program Files.
How can I set this, ...
3
votes
2answers
70 views
Does QGIS support internationalization?
Does QGIS support multiple languages? I have some shapefile with
Arabic names in its attributes, and they appear as: ????
If I want to see the names in Arabic, do I need to purchase multi-language ...
0
votes
1answer
47 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 ...
0
votes
0answers
18 views
qgis automatic area update [duplicate]
I use QGIS to create forest management maps. I create a forest type polygon layer for based on forest type, age, etc. I frequently edit these polygon boundaries as the plan is developed. As far as I ...
1
vote
1answer
74 views
QGIS contour lines shapefile to DEM help
I want to create a DEM from depth contours (shapefile) in QGIS. I've been trying to work out how to do this based on this previous question, notably from this link from that page, however I'm stuck, ...
1
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0answers
24 views
GRASS v.overlay.or Error when trying to split a polygon with a line
I am using the Grass plugin in QGIS for Windows (1.8.0). I am trying to split a polygon with a line feature. I am using the v.overlay.or function within the QGIS Grass plugin. I have the line layer ...
1
vote
0answers
29 views
Generating “weighted convex hull”
sadly I don't have any keyword that reflects what I'm looking for:
I have a vector layer consisting of points, which have an integer attribute ("signal quality" here), that I want to plot as a convex ...
2
votes
0answers
45 views
“Map 1” vs “Map 0”
When I compose a map to print, and get everything all set; then close it for some reason; then reopen it--the scale bar appears messed up. I then go to the Scale Bar settings, and find that under ...
0
votes
0answers
25 views
catchment delineation
I am trying to use qgis to delineate between three sub-sub-catchments.
I have contour shape file of 20 meter height.
Sub-catchment is about 12 square kilometers area but consist of three ...
0
votes
1answer
21 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
35 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
77 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
29 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
103 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
40 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
57 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
57 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
61 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
44 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
32 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 ...
11
votes
2answers
257 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
220 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
75 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
87 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
68 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
33 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
1answer
61 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
55 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
69 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
48 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
50 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
49 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
68 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
41 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
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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
54 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 ...
