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

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2
votes
0answers
209 views

how to make decent sense from scattered river depth measurements

I sampled river depth at scattered positions and I want to be able to make a map and GIS layers out of it. My problems are: As the river meanders the interpolation I do in scientific packages i,e. ...
0
votes
0answers
124 views

Maxent out of bound error?

I selected my climate data from wordclim ( tile 29 ) and then used QGis to convert the data to .asc format . My occurrence data is in degree decimal.But when I run Maxent on any layer it says that the ...
2
votes
1answer
157 views

How to multiply raster DEM with a linear graph value

I would like to multiply my Raster DEM with a linear graph value y = mx + C. The graph values look as follows: I want to make a new raster where each cell will represent a damage factor from ...
1
vote
1answer
61 views

QGIS 2.0 Can I get panels to display as tabs

I recently got myself very confused by getting the "Layers" panel hidden under the "Layer order" panel and then spent hours wondering why I could no longer right click on the layer to get the menu. I ...
1
vote
1answer
73 views

Merge two vector layers with different granularity

Beginner at QGIS here. I have two vector layers. One represents country boundaries for the whole world. The other one represents region boundaries, but only for OECD countries. I would like to ...
6
votes
2answers
245 views

Can QGIS Trace Features?

I generally have an doubt about QGIS. Is it possible to Trace the feature in QGIS? As in the case like ArcGIS for Desktop which has a tool called "Trace" in its Editor Toolbar? If yes, how we can do ...
1
vote
2answers
161 views

County-Level Ethnic Shapefile: United States

My professor usually provides the shapefiles that we deal with in our analyses of the United States--population, votes, etc., but I'd like to know how I can get these myself. I'd like, in particular, ...
2
votes
2answers
125 views

How to run QGIS server on EC2 micro?

I'd like to learn something about web maps and so decided to start out using EC2, following different tutorials I was able to start a micro instance but I can't find my way on how to get qgis server ...
2
votes
1answer
328 views

Using a shapefile in QGIS makes it unusable in ArcGIS?

We currently use Arcgis 9.2, and we are looking at moving forward with other software, and we have been testing QGIS recently. Basically we are trying to copy the existing projects we have, and ...
0
votes
1answer
136 views

Probably base64 encoded WKB - Reading in QGis/ArcGIS?

I have a probably base64 encoded WKB string. How would I load that feature represented by the string into QGis or ArcGIS? I found the QGis QuickWKT plugin, but that does not handle my base64 encoded ...
3
votes
1answer
195 views

QGIS display does not reflect projection

I have slight experience with ArcGIS, but am new to QGIS. I'm trying to set the projection of my map, and I understand that this is done by altering the CRS (coordinate reference system) of each ...
4
votes
1answer
88 views

Area calculation of an object without coordinates

I have a photo of an object with a scale and I want to calculate its area. I guess I have to create a polygon of the area to be calculated to use the 'field calculator'. But how do I tell the program ...
2
votes
1answer
232 views

Moving a shapefile point to specific coordinates

In QGIS is there a simple way to move a shapefile point in a shapefile point file to specific coordinates? Without exporting the points to WKT changing the x,y values and then importing the WKT via ...
2
votes
1answer
784 views

How to call processing toolbox in Qgis' python console

I have been trying to use processing toolbox via python console in Qgis 2.0.1. I am able to write the following comamnds: I am particularly interested to run 'r.statistics' from GRASS module. ...
1
vote
1answer
82 views

What is the use of Automatic overview support in Qgis 2.0?

Automatic overview support in map frame is one one of the new feature added in QGIS 2.0. In QGIS 2.0 Documentation explanation about this is given as Automatic overview support in map frame: "Need ...
2
votes
1answer
549 views

How to resolve “premature end of script headers” error with QGIS Server? [duplicate]

I attempted installing QGIS Server following these instructions. Installation was successful with no errors reported. However, when I try to use GetCapabilities I am getting this error: Internal ...
0
votes
1answer
187 views

Pull pixmap image source from ui edit text in QT

I'm putting together a custom form for QGIS identify using Qt Designer. One attribute has a file name to the accompanying photo of the feature. I'd like to have the photo label in the form grab the ...
1
vote
0answers
60 views

When digitizing, polygons are inverted

I need to use QGIS to digitize my images. My images are scanning electron microscope (SEM) images of rocks. I am interested in analyzing the pore space in the images. Here is the steps I follow: I ...
3
votes
1answer
179 views

How to set and configure a value relation edittype in QGIS 2.0?

I am trying to set the edit type of a vector layer to use a value relation. The Python commands below are processed without errors or warnings, but the when I check the properties in QGIS, only the ...
4
votes
1answer
844 views

How do I add Garmin .img files to QGIS?

I downloaded 10 .img files from garmin.openstreetmap.nl which are supposed to contain the topo tiles for the area I would like to add in qgis. I've been unable to find any instructions on how to use ...
0
votes
0answers
23 views

Qgis doufur, query problem [duplicate]

i've a question about a query I need to query results that are multiple of 50 like 100,150,200,300 How can i perform the right query?
3
votes
1answer
282 views

NOAA Nautical Charts .bsb format

Is it possible to load a nautical chart from NOAA into QGIS that has the .bsb format? Didn't have much luck with mrSID format. using QGIS(dev) on ubuntu 13.04
2
votes
2answers
378 views

How to create callout/balloon labels in QGIS 2.0?

I'd like to use callout/balloon labels for a vector layer in my GIS using QGIS 2.0. The only way I can see to do this is to position an ordinary label where I want it and then draw an empty text ...
1
vote
2answers
106 views

How to view dbase tables?

Using Linux, is there something out there to quickly view a dbase file? Sometimes there are look-up tables(.dbf) to accompany a shapefile. Libre Office Calc can't read it. Maybe a QGIS plugin that can ...
2
votes
0answers
187 views

How can I create random concave polygons for test purposes?

In the context of generating random test data using QGIS (in a shapefile): I can generate random, continuous (adjacent) polygons by first creating n random points using ftools and then generating a ...
10
votes
2answers
5k views

How to rename attributes/fields in a shapefile attribute table?

I would like to rename some fields in my attribute table: Like rename XRF_N3in something else. It seems quite a easy issue but I don't find any information about how can I do that... I've QGIS 1.8 ...
5
votes
1answer
501 views

Is there a python option to “join attributes by location”?

I am trying to perform the function join attributes by location as found on the QGIS menu Vector>Data Management Tools. I am seeking an open source python option for this. I know arcpy has a spatial ...
1
vote
2answers
629 views

Weighted heatmap analysis- density of points, vs density of weight variable

Was just wondering if anyone could help me with a problem. I'm trying to map wellbeing scores (out of 10), using locations from a survey of 15,000 households, using the HEatmap command in QGIS. It's ...
3
votes
2answers
591 views

Is it possible to give 2d contours a Z-height from their attribute table in QGIS? (Or ArcGIS?)

I have a contour data file downloaded from UK Ordnance Survey, which gives 2d contours of an area in gml format (also supplied in .shp format) with the heights of each contour attached to the ...
0
votes
1answer
185 views

Symbol levels in QGIS 2.0 [duplicate]

I have used symbol levels in my current project to define the hierarchy of the different roads. I have tried to make the symbol levels the same in order to achieve the desired look, with no luck. The ...
0
votes
2answers
295 views

“Identity” overlay in QGIS?

I have two polygon layers I'd like to overlay using QGIS or another open source tool. What I want as output is a polygon layer with the extent of one polygon, but with each polygon in that layer ...
0
votes
0answers
154 views

QGis doesn't start anymore on Debian Jessie

I'm running Debian Jessie (Testing) on my laptop. I installed QGis 2.0.1 from QGis stable repos almost a month ago and had no problems till yesterday; now QGis doesn't start, only splash screen starts ...
1
vote
0answers
71 views

Problem in removing dangles in road network [closed]

Im using qgis2.0 , In a given road network i have to remove dangles, for that what should be the tolerance to be added generaly. please help me resolve this issue
2
votes
1answer
442 views

QGIS select feature, “add to current selection” feature

I am trying to perform a feature selection on qgis similar to "add to current selection" interactive selection method in Arcgis Desktop, is that possible? An example: I perform a spatial query and ...
2
votes
1answer
141 views

Mapserver file to localhost

I have installed OSGeo live 7 - Xubuntu I made a nice map using qgis and I have exported the project using RT mapserver exporter. So I created a *.map file in home/user/documents/ How can I load ...
0
votes
1answer
266 views

QGIS data defined properties 'offset' syntax?

So I have a property field called 'offset', type=integer, range=0-359. The intent is to draw an svg symbol that it offset 5 units radially away from the feature coordinate at the angle (in degrees) ...
2
votes
1answer
96 views

Extract characters inside parentheses in QGIS

I have a shapefile of the buildings on my college campus. It has a "name" field that includes the name of the building and then in parentheses the building's campus address (i.e. Health and ...
3
votes
3answers
1k views

How to transform data points from WGS84 to NAD27?

Preface: I have a set of lat and long data points from Google Maps, which I believe are in WGS84. My project data is in NAD27(BLM14). These points are in West Texas, where NAD27 differs from WGS84 by ...
1
vote
1answer
231 views

How can I get the plugin manager “get more” icon?

I am fairly new to QGIS and i was looking to add more plugins to the core provided in version 2.0 I read the user manual provided by QGIS and found out that there should be an icon "get more" ...
2
votes
2answers
104 views

Get Index for a group QGIS Python

I am trying to add new layers into a specific group which I can get to work if I know the index but how can I get python to fid the index of a group so it can load the new layer into the group ...
1
vote
2answers
132 views

Migrating to the use of databases over shapefiles in QGIS

I mostly use ArcGIS at work and am digging into QGIS at home and for my business. At work we are phasing out the use of shapefiles and moving towards geodatabases. So I am thinking I should look into ...
2
votes
1answer
645 views

What angular units does the QGIS raster calculator use: Degrees, Radians, Gradians?

I am working with QGIs and am converting a slope raster with values in degrees to a slope raster with values in percent using the raster calculator and the following formula: ...
2
votes
2answers
212 views

It is possible to use different fields for symbology and legend labeling in QGIS?

[Edit : working with Quantum GIS version 2.0.1-Dufour] I wonder if it is possible to use some field to set the symbology and some other to label the map. [Edit 1 : I mean labeling the legend in the ...
6
votes
2answers
157 views

What does feature mean in QGIS?

I cant understand the meaning of feature in QGIS QgsFeature class. How it is related to layer and geometry? I have read qgis documentation but i cant understand what is feature.
2
votes
3answers
313 views

What is the projection of an Android Location class instance?

What is the projection of a Location object returned from the LocationClient by a class implementing the LocationListener interface with a fused provider in the Google Play Services SDK? For example, ...
2
votes
0answers
69 views

How easily can you pick up ArcGIS for Desktop if currently learning through QGIS on a Mac? [closed]

I'm currently trying to teach myself GIS and I have some really basic questions. I apologize if this has already been asked, but I have yet to find an answer to my question. So since I use a mac and ...
2
votes
1answer
1k views

Is it possible to create and run custom R scripts in QGIS 2.0?

I am new to QGIS and most of the tutorials I have found are for 1.x and the overhaul has me confused. I would like to create R scripts and run them in QGIS. I have read here that it's possible using ...
0
votes
0answers
26 views

How to divide my area into adjecent polygons containing 80 points each? [duplicate]

I have a couple of thousand points in my dataset. I need to create clusters that each consists of 80 points. The specific selection of which points to put into a cluster is not critical - only the ...
3
votes
1answer
198 views

How to make a different font and color of text in labels?

Is it possible to make a bold or italic, and change the color of individual words Label? Example: the first line is bold in red text, font 12, second row 10 green italic font
0
votes
0answers
17 views

Can't connect QGIS 2.0 to postgresql 9.3 remote server with postgis 2.1 [duplicate]

I am trying to connect qgis to my postgresql server using the add postgis layer option in qgis dufour. I am not getting any details from qgis other then 'connection failed check settings.' However, ...