Quantum GIS is a user-friendly, cross-platform GIS application licensed under the GNU General Public License.
0
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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
107 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
100 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 ...
0
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
63 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
112 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
80 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
74 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 ...
6
votes
1answer
136 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
53 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
62 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
67 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
111 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
27 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
33 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
57 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
22 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
24 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 ...
0
votes
1answer
37 views
Random points can't be generated (QGIS 1.8.0) [closed]
GIS newbie here. I'm trying to assign points to a polygon based on a number corresponding to each polygon. When I go to Vector > Research tools > Random points and choose the "Use value from input ...
4
votes
2answers
136 views
QGIS import polygons in CSV
QGIS 1.8 on Mac: I'm hoping to migrate several dozen local maps from my 30 year old Win3.1 plotting system to QGIS. Polygons are in X,Y (CSV), first point repeated at the end to close it, with ...
2
votes
1answer
38 views
How to upgrade QGIS Capiapo to Lisboa?
I want to upgrade my QGIS version to the newest one, Lisboa, but I'm not sure if I should uninstall Capiapo first. Is there a way to upgrade without uninstalling?
Thank you.
0
votes
1answer
22 views
Deleting QGIS CRS
I've created a new CRS on QGIS but I assigned a wrong name mistakenly to CRS's name.
Now I have the CRS defined but the name of the CRS is wrong, or not easily identifiable.
I was wondering if ...
0
votes
0answers
22 views
how separate Mixed classes
I am trying to deal with the aggregate data in Africover, I want to separate for example the mixed class – In North Kurdufan if I want the 6R from 2H/6R what is the a correct equation I have to write ...
0
votes
0answers
18 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 ...
1
vote
0answers
60 views
What is the main benefit and drawback of: GeoServer, MapServer, Mapnik? [duplicate]
For the purpose of creating a comparison table, please recommend a couple of feature fields that would apply to each FOSS GIS server. And, perhaps answer the question of which desktop GIS System, ...
1
vote
1answer
48 views
Does each road segment need to be digitized into a separate entry for a road network?
I am trying to understand this code in pgRouting for creating topology:
CREATE OR REPLACE VIEW road_ext AS
SELECT *, startpoint(the_geom), endpoint(the_geom)
FROM road;
CREATE TABLE node AS
...
3
votes
2answers
191 views
How to automatically reloaded raster layer if source is changed in QGIS?
How to automatically reloaded raster layer if source is changed? (The path is the same but inside source file are changes)
I use:
qgis.utils.iface.mapCanvas().refresh()
but layer not refresh.
#
...
4
votes
2answers
88 views
Official source for QGIS icons or banners?
I am going to use maps and analysis results generated by QGIS in a presentation. Besides citing the official reference i want to show a small QGIS icon or Banner on the first slide.
I found some nice ...
0
votes
1answer
49 views
min and max values are not correctly calculated for DEM
I'm working with DEM in QGIS and need to know the min and max values of my data.
In the Properties window, under the Metadata tab, the statistics section shows such values. However, I usually find ...
1
vote
0answers
75 views
Google Earth export from QGIS
I'm using Quantum GIS. Is there a way to export a shapefile to Google Earth format (*.kmz) using QGIS?
Thanks.
0
votes
0answers
39 views
What are the rules for digitizing roads for creating a road network?
I want to create shortest route tool using pgRouting. But I digitised roads in a random manner. Shall I need to give a separate row for each road segment?
