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

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3
votes
1answer
447 views

Why is Spatialite showing dates in MM-DD-YYYY format?

I have a table with a dates column that is formatted in MM-DD-YYYY format, as shown in SQL SELECT statements. I'm using Qspatilite (QGIS 1.8) and Spatialite GUI. When I ORDER BY the date column it ...
1
vote
1answer
1k views

How to use GDAL-commands in QGIS?

I recently used a GDAL-command working with the OSGeo4W command line, but it does not feel that comfortable. Is there a way to somehow execute a GDAL-command directly in QGIS? Right now the ...
1
vote
1answer
39 views

How to cycle thru items in print composer?

In print composer I have many items placed on the "paper". These items include borders, one map, bar scale, logo and an arrow. When the items overlap each other I am only able to select the item on ...
1
vote
1answer
105 views

Help with trying to track ice and polar bears on a map. No idea where to begin

I was asked create a little google map showing the location of Polar bears. I've been given the location data in lat-long format. For each bear I've been given a file containing the following ...
2
votes
0answers
154 views

QGIS - Android, loading a .tif file

I have a .tif file I would like to use as my base map on the Android version of QGIS. However, when I try and load it as a raster layer, it states that this is not a correct raster source. Is there a ...
0
votes
1answer
112 views

Strange problems with project crashes and bad:alloc in QGIS 1.8 linux

during last days I had to prepare some maps from field data. I mainly worked with point shapefiles and openlayers map background. After some time I always noticed some problem like just partial ...
1
vote
0answers
221 views

Oracle Spatial support QGIS 1.9-0-Master (Ubuntu)

I just installed QGIS 1.9.0-Master (Build 480) on a Ubuntu virtual machine. I am running/compiled against GDAL/OGR 1.9.2. My question is why I cannot add Oracle Spatial Layers as I am able to do ...
1
vote
2answers
128 views

How to clear attribute columns from a Shapefile?

I want to clear all columns from a SHP. Only need geometry of features. I use QGIS and Sextante with grass and saga. Is there any tool for this job...
1
vote
1answer
447 views

Which CRS fits “Lambert Conformal Conic Projection, Standard Parallels 46.40 and 49.20”?

I am trying to georeference a VFR chart in qgis and I can't figure out which CRS to use. Map projection - Lambert Conformal Conic Projection, Standard Parallels 46.40 and 49.20. Any ideas which ...
3
votes
3answers
855 views

How to add QGIS Python API Intellisense support in Aptana Studio3/Pydev

I'm developing QGIS plugins using PyDev in Aptana Studio 3 and I would like to know if it's possible to make it aware of the QGIS API and add some "intellisense" functionnalities when programming. For ...
1
vote
2answers
497 views

Georeference IMG file in QGIS

I have a problem: I'm trying to georeference a satellite image (ASTER, ERDAS Imagine file *.img) in QGIS. I have georeferenced with QGIS before and never had any problems. The file is georeferenced ...
0
votes
1answer
97 views

No legend in QGis Web Client

I have a QGIS Web Client working, but it lacks a legend and metadata panel as is shown here What do I need to have the referred legend panel?
1
vote
0answers
43 views

can the Identify Features button in QGIS list data in natural order

Is there anyway to get the Identify Features button in QGIS to list my attribute data in their natural order, NOT in alphabetical order?
2
votes
1answer
312 views

Solution for slow display of postgis-tables ? (qgis 1.8 + postgis 2.x)

I have the problem that my postgres-tables are displayed very slow when I scroll them in QGIS. I have no problem with other tested GIS (e.g. UDig, GVSig, ArcGIS). The number of objects isn't large ...
1
vote
0answers
214 views

SEXTANTE runalg and QgsVectorLayer issue

I'm trying to make a script for converting polygons to lines. But I'm having some issues while generating temporary layers. In this script, I iterate through all the features of the input layer to ...
4
votes
3answers
1k views

How to find the polygon inside which a point lies?

I have a layer with polygonal features. Each feature has attributes and values. I also have a list of co-ordinates and I would like to know which feature (or polygon) the co-ordinates lie in. Could ...
0
votes
1answer
62 views

How to Create a Note System inside QGIS

I need to make something similar to a note system, where i can create a feature that will give me something similar to a note system (or a square in the map linked to a feature that will only show ...
1
vote
1answer
309 views

QGIS Crashes when I try and overwrite a shapefile using QgsVectorFileWriter.writeAsVectorFormat (QGIS 1.8, MacOS 10.7.5) [closed]

I'm somewhat new to this, and working on a plugin. My plugin will create a points memory layer, which is then written out as a shape file using QgsVectorFileWriter.writeAsVectorFormat. self.writer = ...
4
votes
2answers
401 views

How to convert numeric fields into strings with leading zeros?

I'm trying to define an action in Quantum GIS using on of my fields but I have some problems with its format. I have a numeric string like '5' and I need to have a format like '005'. I've tried ...
1
vote
1answer
135 views

Why new feature disappears when editing polygon?

I try to create internal polygon within existing polygon. After I created a ring, I add a new feature inside the ring. Suddenly, this new feature disappears. I confirmed that this feature went to the ...
1
vote
1answer
78 views

How do I put label inside polygon at any scale in QGIS 1.8.0

I would like to put labels inside polygon anytime and any scale. I'm using "Labeling" from the toolbar. Although I tried all types of the placement from the advanced tab, some labels still fall ...
1
vote
2answers
345 views

How to write a QGIS regex for rounding to two places after the decimal point?

In QGIS field-calculator round() is not working in QGIS 1.8 so I try to do the following with a regex: I'd like to keep the first two places after the decimal point - where do I go wrong? ...
2
votes
2answers
138 views

Sextante modeler feature selection

I am trying to select grids (polygon geometry) that intersect with a building layer. I can do it by using "Select by location" tool and then I generate centroids from the selected grids. There is no ...
3
votes
2answers
442 views

How to add layer/raster with specific position in the QGIS layer list?

I use addRasterLayer(rast,'Name') but this adds the raster to the top. It is possible to set position when I add raster at once? Is it possible??
1
vote
2answers
80 views

Error reported when trying to import prj for data points in New Brunswick Canada into QGIS

I have data points recorded with a Trimble GIS. The projection is New Brunswick Sterographic Double Projection, which as near as I can find via a Google search is EPSG:2953. However, when I try to ...
1
vote
1answer
783 views

Rasterize vector layers with different extents into identical raster grids with QGIS

I am working on a quite simple spatial potential analysis using QGIS. I have some ArcGIS knowledge, but I am new to QGIS. My task is to identify the functional inner city of a region based on ...
0
votes
1answer
143 views

Grass algorithms doesn't appear in the sextante toolbar in QGIS

I was having problems with some sextante algorithms in my QGIS 1.8, something related with wrong "os" name, I found a post in which reccomend to install the 1.9 master version. I clean uninstalled ...
2
votes
2answers
112 views

Are there any known issus opening a QGIS Desktop project on Android?

Does anyone else have trouble when they try to open a project which was worked on in the QGIS desktop version 1.8 (I understand this is the most up to date version for the desktop) and try and open it ...
2
votes
2answers
1k views

QGIS, point clouds and photogrammetry

I'm trying to use photogrammetry and Structure from Motion to record buildings, and I'm looking for a way to bring these into a format usable in GIS, in particular pointclouds and models of terrain, ...
0
votes
1answer
145 views

How to setup and use GRASS?

Previously I've asked an question and Micha gave me a helpful advice:How to find the watershed area for each point in the river network using DEM? After getting the useful DEM file, I began to setup ...
-2
votes
1answer
197 views

Qgis: Select multiple layers in sql-Filter [closed]

I have a Shape-File with lines of streets. Now I want qgis only to show the categories: Type: primary and Type: secondary and Type: motorway. How do I do this? This doesn't work: "type" = 'primary' ...
1
vote
1answer
205 views

how to rename the band-names of a layer stack?

I created a layer stack of 20 images (all GTiff-files) using the gdal_merge tool in QGIS, available at: raster > miscellaneous > merge The result is a GTiff layer stack of the 20 images, but ...
0
votes
0answers
336 views

Create a polygon shapefile using point as boundary

Following have two problems: I am now have 4 point in a shapefile and I want to set the point's coordinate for boundary of a polygon The points are xmin, xmax, ymin, ymax that can just be a ...
0
votes
0answers
1k views

Vector Intersect QGIS (1.8.0) Gives empty shapefile

I am trying to find points that fall within a polygon. Both layers are vector ESRI shapefiles. I used the fTools based intersect under Vector>GeoprocessingTools>Intersect. The output is an empty ...
2
votes
1answer
212 views

How to store attributes of a large shapefile in a list?

I am trying to store the attributes of a shapefile into a list. With following code it works for smaller shapes: addA = [] While provider.nextFeature(feat): attrs = feat.attributeMap() for ...
2
votes
0answers
237 views

Divide polygon layer by point layer in QGIS?

I have two layers - one polygon layer that is a buffer of a road layer, and one point layer that shows certain locations along that road. What I want to do is to divide/split the polygon layer at the ...
1
vote
1answer
240 views

getting a merged color satellite image from red,green, blue, pan, and nir tifs

I am using Tiff images from Digital Globe and trying to get a color satellite image. I have merged the red, green, blue, pan and nir tiff files into one file. I then changed the band properties to a ...
0
votes
0answers
87 views

Sextante script for statistic info

I want to generate a script for getting statistic information window from selected feature. For example i have two layer building(polygon) and railway(linestring). By using this tools i got a window ...
0
votes
1answer
86 views

Help needed with the use of FARSITE

Is there anyone who has worked with FARSITE? I can build some of the files needed, such as slope and aspect, but not sure where to start when it comes to building files for 'canopy', 'fuels', etc. I ...
1
vote
0answers
112 views

GIS Maximum area coverage problem

I want to find optimum antenna location for an area. Every antenna can cover an circular area. These areas diameter is 750meter. So how can i find minimum number of antennas and locations. NOTE: I use ...
2
votes
0answers
540 views

How to write vector layer to csv file with geometry by PYTHON?

I use Python try to write vector layer file to csv file with this code QgsVectorFileWriter.writeAsVectorFormat(mylayer, r'c:\temp\xyz.csv', "utf-8", None, "CSV") It can export to xyz.csv but only ...
1
vote
1answer
122 views

How to rescale vector data? [duplicate]

I've got some old maps in dxf format. QGIS imports them correctly but with a nonsense scale. It can export the data it gets to shp of course. Does anyone know how to rescale vector data so it can be ...
0
votes
1answer
47 views

QGIS Symbology changes by number value

I've gotten a state file with count outlines joined to an attribute file that shows numbers of items per county. ArcGIS has the ability to set the symbology to grade the results into pre-determined ...
0
votes
0answers
168 views

Why do my Attribute table joins result in all NULL?

I spent hours getting "null" results in joining a downloaded state and county shp file to a self-created file (SCF). What I found was that the SCF had to have "EXACTLY" the same set of names/ID#'s as ...
1
vote
1answer
2k views

How to transform World data from EPSG 4326 to EPSG 3857

I have tryed different opensource tools to transform a world data shapefile from 4326 to 3857 but I always have an error. Im not sure, but is it because of Antartica? I have tryed with GDAL and QGIS ...
1
vote
2answers
748 views

Trigger to fill attributes (data, client ip) in table for each new objects, PostGIS

In PostgreSQL/PostGIS database stores shapefiles. Client users software - QGIS. Please help me write PostgreSQL/PostGIS trigger, which for each newly added/updated feature in layer added 'time create' ...
4
votes
1answer
874 views

How to set up Python 2.7 to work in both QGIS and ArcGIS?

I have both ArcGIS 10.1 and QGIS 1.8 installed and both include Python 2.7 in slightly different setups and in different folders (c:\Python27\ArcGIS10.1\ and c:\Program Files (x86)\Quantum GIS ...
4
votes
2answers
126 views

“GIS” Mapping on Monument - Scaling

I have a Baroque tombstone for which I have to map the damage phenoma. Normally one can use a vector drawing programm but one has always two boundaries between the different polygons. Questions: Is it ...
1
vote
0answers
116 views

Problem using grid with a vector layer [closed]

I need to establish a model of maritime pollution and I try to use the grid option to work on ocean sectors. I tried to use my grid on a vector file, .shp, with points. Each point is a maritime ...
7
votes
1answer
6k views

How to select points within a polygon from another layer?

I'm using QGIS 1.8 with a PostGIS database and I have three postgis-layer in qgis a lines layer, a points layer and a polygon layer. What I'm trying to do is to select a polygon in the polygon layer ...