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

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2
votes
2answers
2k views

QGIS, Table Manager cannot rename column title

My current attribute table has a column whose title exceeds the ten letters maximum. I installed Table Manager, hoping I could rename the certain field to further use it (in order to add some ...
0
votes
2answers
423 views

How to search and move to feature in QGIS?

After solving how to search text string I need to move to the selected feature. Is it possible to do that?
0
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1answer
67 views

QGIS (Mis)Detecting Escape Characters in SLD files

Okay, I am just running into some trouble with the string literal functionality with QGIS's rule based styling. For example I have an attribute called LITH that equals 'BAS\b'. The rule where LITH = ...
0
votes
2answers
300 views

How do I successfully install the LecoS plug-in for QGIS 1.8

I have been trying to follow the instructions given here, but repeatedly get an error message pop-up titled "Mount" stating Access is Denied. Does anyone have a solution please?
1
vote
1answer
121 views

Image map plugin not working with point data QGIS

I have a point shapefile and I am trying to create a html image from it using the html image map plugin; however, I can not get it work. I get the error: Wrong geometry type Any ideas on this? ...
0
votes
1answer
1k views

How to install Sextante in QGIS 1.8 without Plugin Installer?

How can I install sextante (and where can I download it) if the Plugin Installer doesn't works? As I work for a corporation, I have some problems conecting to the official repository, and I cannot ...
0
votes
1answer
80 views

How to save 'No data value' to a QGIS layer style properties?

I have many raster tif files (100+) I found this link to the MultiQml plugin very helpful, from this post: Can I change properties of several layers simultaneously? However the 'No data' values does ...
1
vote
2answers
135 views

How do I gather X and Y co-ordinate data from a vector grid overlay in QGIS 1.8.0?

I have overlaid a 10m x 10m grid onto a UK Ordnance Survey raster map. I have set both raster and vector maps to the same CRS, (OSGB 1936 British National Grid; ESPG:27700). I have a csv file ...
1
vote
1answer
91 views

Ubuntu 'Manage plugins' in 1.9 (master) doesn't show 1.8 plugins

I'm using Qgis master on Windows 7 and more recently xubuntu 13.04. On xubuntu, the 'fetch python plugins' is missing, which Nathan just pointed out was intentional rather than a bug. My problem is ...
0
votes
1answer
315 views

Qgis - need to draw exact lines (mtrs) with fixed angle

I use GIS 1.8. I have the need to be able to draw exact lines and shapes on a bing map. (This is to project a yet to be build greenhous project on a map to show what i would look like). I have ...
0
votes
2answers
2k views

QGis: Merge intersecting polygons into one which are part of the same feature

I'm not a GIS professional so I hope I use the correct wording, at least I hope you understand my question. Let's say there are 5 polygons in the feature A. In the shape file there are more ...
1
vote
1answer
81 views

How do I prevent QGIS 1.8.0 changing my dbf table values when joining tables?

Im a newbie on GIS as well as QGIS. I have a table of data saved from Excel as dbf format. After dragging and dropping the file into QGIS and then opening the attribute table, all values less than 1 ...
5
votes
4answers
590 views

ArcGis Trace Tool for QGis?

is there any tool in quantum gis that traces a line like the trace tool (Editor Toolbar) in arcgis? I want to draw a line and trace this line back so that i get the beginning and the end of the line ...
1
vote
0answers
23 views

Creating a buffer based on area (i.e. sqm) instead of distance [duplicate]

Is there a way in ArcGIS 10.1 or QGIS (or any add-on) to create buffer based on an area (i.e. sqm) rather than using buffer distance? I'd like to create a buffer of let's say 5% of the area within the ...
7
votes
1answer
214 views

Is Python essential for working in QGIS?

I am a beginner in QGIS. I Generally have a doubt: to work in QGIS is it necessary to know Python? whether i am asking we should know to write python programs to make certain modules run?
2
votes
1answer
527 views

Fetch Python Plugins missing

I'm running QGis master v1.9.0 on xubuntu and the 'fetch python plugins' option is absent. This guy had this problem with vanilla 1.7.5 but fixed it by upgrading to 1.9.0 master. Nishant had this ...
4
votes
4answers
1k views

How to get vector data from OSM to use in QGIS?

How do I get data from OpenStreetMap which I can then edit in QGIS layer by layer? What is the best OSM output and what / how do I get to a suitable input for QGIS? OR...is there another appraach to ...
1
vote
1answer
113 views

QGIS Layers Not Lining Up

I am new to QGIS, I have been using ArcGIS for most of my maps. I have two layers that are not overlapping properly. One is a shp file from a GIS clearinghouse and another from a delimited text ...
1
vote
0answers
82 views

Is it possible to undertake spatial clustering with QGIS?

Is it possible to undertake spatial clustering with QGIS, and also end up with proportional symbols in a quasi 3-d symbology?
0
votes
1answer
1k views

How to search text string and select item in QGIS?

I have a table attribute with complete roads name. I have to search items by digiting a part of the road name and I need to colour all the items selected. eg: ROAD NAME: / road 01 / road 02 / road 11 ...
0
votes
1answer
60 views

Using an image file as a placemark in qgis

I am making a map of sports clubs in London. I have each club's crest as image files (tiff) and want to make the placemark symbol using these images. I know it's possible to upload images in the SVG ...
2
votes
1answer
177 views

QGIS and ArcGIS on the same PC

I work for a small non profit conservation organization and we have a reasonably high turnover of people... so it stands to reason that some people don't want to change from a preferred program. this ...
1
vote
1answer
70 views

Get the ID of polygon in edition sessions of QGIS?

I did a Qt custom form for QGIS which contain a QlineEdit that must get the ID of the current polygon in edit session. For example, I start edit sessions I draw 3 polygons when the Qt form is opened ...
1
vote
1answer
106 views

How to write a expression in field calculator for finding $X and $Y?

I'm trying to calculate the lat/long of points using the Q GIS field calculator.Nathan W suggested to First, save the layer as WGS84 and import it again. Then in the field calculator you can use $x or ...
0
votes
1answer
330 views

How to resolve error “Handle bad layers” in QGIS?

I'm new to QGIS and have been seeing what it can do for me – seems good. I imported shape file data from a UK Ordnance Survey data file and saved the file in a new folder. It was very good, doing all ...
0
votes
1answer
135 views

Installing raster resampling module in QGIS 1.8

On the website of Sourcepole, I have recently come across the case of resampling images in Quantum GIS. Because I am rather a beginner in GIS software I would like to ask you for information about how ...
0
votes
1answer
64 views

Table calculation in QGis

I have a shape file with the attribute "yield". I need to know the math difference between yield (id1) and yield (id2)...then yield (id2) and yield (id3) and so on... I hope you understand what I ...
0
votes
1answer
86 views

Why is the CSVT file changing my real values to null?

I made a CSVT file to change desired real data to string data. After importing the original CSV file, that was linked by file name to the CSVT file, the string data appears as normal however all the ...
0
votes
1answer
495 views

Can I export QGIS basemaps as raster in ArcGIS 10.0?

I'm mapping a National Park in Malawi using Quantum GIS as with the plugin I can get the images from G.Earth (I need to see the vegetation). Since my supervisor is using ArcGIS 10, do you know if ...
0
votes
1answer
77 views

How can i detect the number of polygon is drawed in a edit session in QGIS

I am working with qgis 1.8 and i want to know how many polygon drawed in one edit sessions is there any signal emitted with qgis ???
0
votes
0answers
94 views

Action: open file from database

I have an image stored in a db (postgres / bytea). Is it possible to display (open) this image with a qgis action? In Qgis I have a (postgis) layer open, one attribute is the id of the image in the ...
0
votes
1answer
167 views

How to draw a custom map on top of base layer

I'm looking for the easiest way to draw a custom layer and export it as a tile cache. Basically what I would like to be able to do is load a base layer, and then draw objects and annotations on top ...
3
votes
1answer
151 views

Creating a radius of influence around points

I have a vector file of points. What I need to do is create a circle with a radius of 12km round each point. Would it be possible to then find out what percentage of my total map is covered with ...
2
votes
2answers
225 views

How can I create a multipoint geometry in QGIS?

I've got a Spatialite layer in QGIS with geometry type MULTIPOINT. Now I'd like to add some data in this table in the 'usual' way, so by doing multiple clicks in the map (e.g. left-click, left-click, ...
3
votes
2answers
238 views

How can I turn islands into individual features in QGIS?

I have what seems like a pretty straightforward task in QGIS: I have a shapefile that, in some cases, groups multiple separate landmasses into a single feature. For example, the Hawaiian islands are ...
2
votes
2answers
366 views

How do I prevent Qgis from being detected as “not responding” when running a heavy plugin?

I use the folowing line to inform the user about the status: iface.mainWindow().statusBar().showMessage("Status:" + str(i)) The plugin takes about 2 min to run on my data set but windows detects ...
2
votes
1answer
148 views

Why is this line split in two?

Even though this is a single line, it is stored as a two-part polyline. I can split it and rejoin at the break, but whatever I do it won't join the two into one line. (This is most obvious if you turn ...
6
votes
6answers
428 views

Tool/Algorithm for generalizing OSM-Files for printing maps

Is there a tool or algorithm to (topological) generalizes OSM-shapes? I would like to build a printable map in different scales. In the image below you can see the same divided road (yellow) at ...
1
vote
2answers
60 views

Find the majority area within another area

I have a survey grid overlaid unto several administrative areas. Both are polygon features and I have performed a union on both features in order to determine the areal contribution of the segments ...
1
vote
1answer
115 views

What does “Computed -srcwin falls outside raster size” mean when clipping?

What does this mean, when I try to clip and save the result as a sqlite or other format please? "Computed -srcwin falls outside raster size of 7807x4771" cheers, Bruce
0
votes
2answers
127 views

Can Vector grid shape file be clipped with Satellite image in qgis?

I am working in open layers plugin in Qgis . in order to project the satellite image wit respect to vector shape file i am having, Andre Joost suggested me to create a vector grid with crs sysytem of ...
4
votes
2answers
389 views

How to draw lines from two points in a CSV?

I have a CSV file where one line looks like this: Duration, user, lat-start, long-start, lat-end, long-end 298, Casual,38.9101,-77.0444,38.91554,-77.03818 Each row in the CSV has two points and I ...
3
votes
1answer
615 views

Why does QGIS hang when I try to create a vector grid?

I am working in open layers plugin.i need to project the satellite data with respect to vector data shape file i am having .for that Andre Joost suggested to create vector grid with vector data ...
2
votes
1answer
171 views

How to update data from external table in real time?

I have been trying for a long time to connect a external table data[csv] through Excel (for exmaple) with QGis with the objective to each time i change any data in table(for example data location - ...
1
vote
0answers
215 views

How to create a dynamic, interactive map with QGIS?

How can we create an interactive map with QGIS? I would keep it in the bottom of aerial photographs. When the mouse moves over elements of a layer, I wish they will be highlighted and a window shows ...
1
vote
0answers
63 views

gpx conversion tools in qgis keeps asking for GPSBabel

I want to perform a simple task: show the waypoints of a GPX "track" as dots, not as a set of connected lines in QGIS ( Conversion -> Waypoints from a track ). I use files, not any particular USB ...
2
votes
1answer
88 views

Why does QgsSpatialIndex::nearestNeighbor(point, 1) sometimes return 2 lines?

I'm trying to get the closest line to a point using pyQgis in a plugin. The active code file is this: http://pastebin.com/TDzmsKVM When I request the closest line (only 1) nearestIds = ...
0
votes
0answers
18 views

Import attribute data? [duplicate]

I have a question that probably has a simple answer but I have not found it yet. Can anyone help? I have a shapefile of Germany's counties ("Landkreise"). Now I would like to add several attributes ...
0
votes
0answers
18 views

No fetch Python plugins in qgis 1.8 + ubuntu 13.04 [duplicate]

I tried to install qgis 1.8 to ubuntu 13.04 but when installation finished I couldn't find "Fetch python plugin" button in plugin menu. I didn't find any soloution for this problem. Any idea what's ...
0
votes
0answers
224 views

How to fill in the parameters for kernel density estimation?

I am desperately trying to calculate animals home range with kernel. Unfortunately, the result is obviously incorrect and I cannot identify my mistake (I would like to post a screenshot but its not ...