Quantum GIS is a user-friendly, cross-platform GIS application licensed under the GNU General Public License.
0
votes
1answer
52 views
I don't seem to be able to save Layer Styles in QGIS
I have created and saved layer styles, not recently I admit but have done in the past. For some reason or other I just don't seem to be able to save any new ones in QGIS. No file is created. It does ...
0
votes
0answers
24 views
QGIS: Unable to project raster layers correctly on a Toshiba Tecra 64# Win7
I know how to project a raster, I can do it on other machines. On this particular machine the raster loads but are no where near the correct position as if the datum is on another planet.
0
votes
2answers
84 views
How to resolve missing Python module (importlib) for GRASS/Sextante?
I have installed the nightly build of QGIS 1.9 from Larry's Dakota Cartography site, and have downloaded the latest Frameworks from William's Kyng Chaos site.
However, I am unable to install the ...
0
votes
0answers
22 views
How to use for loop to make driving_distance more efficiently？
I use driving_distance function in pgRouting to work with my river network. There are 159 nodes in my river network, and I want to get the distance between all of the nodes. This is my code so far：
...
0
votes
1answer
23 views
How to prevent Qgis clipper to clamp nodata values?
I'm trying to crop some old georeferenced cartography in order to have a continuous map (every map has its blank borders that overlaps).
Usign raster->extract->clipper and setting no value to -32768 ...
0
votes
0answers
55 views
How to use more than one QT form in Qgis Python? [closed]
I need a help to use multiple qt forms in PyQgis. For example, i need to open one qt form after the login form.
I tried like this:
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core ...
0
votes
0answers
31 views
Worsened image quality and flase colours after georeferencing
When I georeference a map of vegetationtyps (about 20 colours, each representing a certain vegetation) the quality of the georeferenced map is really bad and the some colours has changed (e.g. black ...
0
votes
1answer
54 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 ...
0
votes
0answers
29 views
How to cut stacked polygons
I have a geo-dataset whereby some polygons are "stacked". The outer polygon does not contain a hole where the inner polygon resides:
The result of this, is, when I transfer the polygons to Google ...
1
vote
2answers
47 views
define a datum and meridian in a CRS in QGIS
I have a shapefile defined by the source as:
"The layer is in geographical (lat-long) coordinates (GCS_Clarke_1866; Datum: D_Clarke_1866; Prime Meridian: 0)."
opening the shapefile in QGIS 1.8 the ...
2
votes
1answer
63 views
How to access the road graph plugin in python?
I am developing a few scripts in Python for QGIS 1.8 to automate some geo-tasks and one of them would be to calculate the shortest distance from a hospital to each building in a town.
I would like to ...
0
votes
2answers
71 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 ...
0
votes
0answers
56 views
Topographic Wetness Index
Is there any option to SAGA to calculate the Topographic Wetness Index ?
I have a big area and I tried many times with SAGA, the last time I thought the results was ok (before SAGA would crash or give ...
0
votes
0answers
42 views
qgis python app how to add edit feature button?
I'd like to develop a QGIS Python app for plotting points and editing the attributes. I've started with the tutorials here: http://blog.qgis.org/?q=node/59 and read the cookbook ...
0
votes
0answers
33 views
QGIS Identify tool on vector Crash
I have built QGIS (1.7.4) on Mingw successfully and everythings seems to be alright. My own plugins are also identified and working fine.
There is a crash when using identify tool/ attribute table ...
7
votes
2answers
110 views
Is the QGIS cache directory automatically created?
This question is directly a result of a question posted earlier about the units of cache size:
QGIS - what is cache size measured in
I went to the Options menu in QGIS, to the Network tab. Here is ...
2
votes
1answer
57 views
What is cache size measured in?
Can anyone tell me what the units are for the Cache Size setting in QGIS please? Is it bytes, KB, Mb, MB?
When I look in the directory specified by the path (/Users/.../.qgis/cache/) the cache ...
5
votes
1answer
105 views
How to create a dropdown menu in QGIS Toolbar with Python
I Have a set of some QAction in my QGIS-Plugin and they are created and added to the toolbar like this
icon = QIcon(":/action1.png")
self.action1 = QAction(icon, u"Action 1", self.iface.mainWindow())
...
0
votes
0answers
12 views
Missing panels/toolbars in the print composer [duplicate]
In QGIS 1.8.0 for a Mac I do not have access to any panels/tool bars in the print composer.
The right click does not work in the print composer. I have also tried to reinstalled QGIS but still the ...
1
vote
2answers
62 views
QGIS on Mac WKT import problem
QGIS 1.8.0 Mac OSX 10.6.8
These problems seem to be specific to Mac, as two Windows users don't have the problem.
Import a file as a vector:
TEST.CSV
id;wkt
1;"POLYGON((10 10,20 20,20 30,20 ...
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votes
0answers
37 views
Tectonic / G-Plates, export of shapes [closed]
Whatever I've tried, neither can I compile a running "gplates" on Ubuntu 12.04, nor can I make the windows version run using wine or similar windows emulators.
So what I'd like to ask/please:
Is ...
1
vote
1answer
65 views
Flow mapping visualization using a road layer
I am trying to illustrate travel using a flow map on a road layer. My data is:
city of origin
destination
number of travelers
I would like to use a polygon city layer (or point) and a road layer, ...
2
votes
3answers
113 views
Is there a zonal statistics tool to calculate median and mode raster values for each polygon?
I'd like to calculate zonal statistics for a raster where the zones are defined by polygons in a vector layer within QGIS. Specifically I'm interested in calculating the median and mode raster values ...
3
votes
1answer
82 views
How to merge Waypoints from many GPX files?
I have a large number of Waypoint-layers (gpx) and would like to merge them.
Is there a way to do so using QGIS?
Thank you!
1
vote
1answer
58 views
open QGIS project with parameters
I am looking at a piece of work to deploy QGIS as the standard within an organisation. There is an existing piece of software that I need to link to QGIS so that when a button is pressed within the ...
3
votes
1answer
75 views
How to find the nearest line to a point in QGIS? [duplicate]
My question is that given a point and few lines, how should I go about finding the nearest line to the point?
I am aware of How to I find the nearest line to a point?, but that isin ArcGIS and ...
1
vote
0answers
19 views
QGIS Map Composer, right hand pane has gone! [duplicate]
in the QGIS map composer, I accidentally closed the right hand pane, the pane that includes the command history, item properties, etc. Now I can't get them back. There are no icons to click to get ...
7
votes
1answer
146 views
How to draw perpendicular lines in QGIS?
I have a situation like this:
What I need to do is to connect each point to every line that is at most, let's say 200 m, away from the point. In other words, I need to draw a perpendicular line ...
2
votes
1answer
43 views
How to have QGIS show the number of points that overlay the raster polygon?
I have a number of single-value raster layers defining a area mask and a point layer pulled from PostGIS. Is there a way to have Quantum GIS show me the number of points that overlay the raster ...
3
votes
1answer
54 views
How to import or incorporate formated Excel tab into QGIS print composer
I would like to know if there's a way to import formated Excel Tab into QGIS print composer.
Below is an attachment of formatted Excel tab example I has been asked to display on qgis map composer.
...
1
vote
1answer
63 views
How to “Merge Selected Features” with python?
I have been looking for the answer to this question for some time now, but can't seem to find it! My problem is straight forward:
I have one layer
It contains lots of features (only polygons), say ...
3
votes
1answer
70 views
Is it possible to use different symbols instead of colours in one shapefile in QGIS?
I want to show 50 bird species on a map and give each species a different symbol (with a different colour) so they can be visually distinguished in the map.
Is this possible?
4
votes
1answer
114 views
How to repair and clean contours from high data resolution (lidar)?
I'm unsuccessfully trying to make a bathymetric map with contours extracted from Lidar data at 1 m resolution.
The extracted contours have a lot of artifacts like dangles and islands.
First I used ...
0
votes
0answers
19 views
Change offset of geotiff file [migrated]
I need to change the offset of some tiff files that I am exporting from Qgis.
Qgis gives them a offset of 0xbd72, while the program I need to load them in to only reades files with an offset of ...
2
votes
1answer
122 views
Integrate QGIS into Hadoop cloud is it possible?
It might be very basic question.
Can I integrate QGIS +Hadoop cloud?
Currently I am going through similar question and few research articles & researching on my side.
In upcoming ArcGIS 10.2 ...
1
vote
0answers
30 views
QGIS automatically inserts segments when editing polygon nodes
I have created a shapefile with multiple polygons. When I attempt to move one of the veritices with the node tool new sements automatically appear that cross the polygon and even cross the opposite ...
1
vote
0answers
39 views
How to debug QGIS Server WMS “Download of capabilities failed”?
Currently I am using a QGIS server with a linux Centos system. I am attempting the create a WMS in QGIS and upload it to my website. I have followed the instructions in the "Quantium GIS User Guide: ...
3
votes
0answers
23 views
Why are there changes in location when printing inserted points?
Añadí una capa de texto delimitado por comas y luego agregue una imagen satelital de google earth. Realizo un diseño de impresión y al imprimir cambia la ubicación de los puntos en varios metros. Cual ...
1
vote
1answer
45 views
Digitized vectors don't match while zooming [duplicate]
I'm trying to digitize in QGIS with Google Maps as the background. Digitizing with constant zoom works fine. But if the zoom is changed, the digitized vectors don't match the Google Maps background ...
4
votes
0answers
50 views
Is there an Attribute Table Feature limit?
I am copying a table with 11,000+ features but only about 700 show up on the QGIS attribute table. Is there a limit? how can I avoid this problem?
Thank You in advance!
0
votes
2answers
52 views
Select / Deselect and Identify Features in QGIS
Sorry if this is all a bit 101, but I'm new to QGIS.
I basically have a large Arc project that I can access in QGIS for reference, so will only really be using it to identify features. For example to ...
-1
votes
0answers
35 views
RESOLVED Qgis crash when refresh layer [closed]
I have a problem with QGIS 1.8. When i use the refresh button for WFS layer this QGIS crash. Please help me !
4
votes
1answer
58 views
How to print selected features in QGIS?
I have a detailed map in qgis (vector, .shp) and I would like to split the map in four parts based on attributes to print each part of the map separately. Unfortunately, I didn't figure out how to do ...
3
votes
0answers
49 views
Masking/removing polygons from shapefile
I have a shapefile containing the road traffic noise of a city.
The shapefile has 5 columns, where 'noise_in' (noise interval) ranging from 1-5 is included.
I want to remove/mask the road noise from ...
1
vote
1answer
32 views
Adding points with defined intervals in QGIS [duplicate]
I'm trying to make a grid with points of defined intervals (e.g. 5 m). How can I achieve this with QGIS?
1
vote
1answer
23 views
How to combine use gradient symbols for layer properties excluding 0?
I want to visualize my data by using graduated symbols. Now, there are some objects with value "0", they should not be printed on the map (which I solved by using rule-based symbols). But, anyway, "0" ...
1
vote
0answers
36 views
problems uploading data onto qgis cloud
I am using QGIS 1.8.0 on a windows 7 machine. Trying to upload a project onto QGIS Cloud.
I have 2 issues. Firstly when i go to publish a map it directs me to upload the data. As i am using a free ...
5
votes
1answer
61 views
Georeferencing a jpeg in QGIS but the scale is way off
I've gone through the really helpful walk-through(s) of how to georeference a jpeg in order to make it a layer, but after inputting the coordinates (either by typing in actual coordinates or clicking ...
1
vote
0answers
48 views
Covering a Polygon with Minimum number of circles with fixed locations
In QGIS, I have a vector polygon of a fixed size and shape. I also have a set of circles of a fixed radius and fixed location, which cover part of the polygon. What I would like to do is remove as ...
1
vote
0answers
27 views
OziExplorer maps not rendered correctly in QGIS
When I open up some OziExplorer (.ozf2) maps in QGIS they are not rendered correctly in that they appear reversed or in-versed. Text on the map is not legible and looks to be in-versed but this is not ...
