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

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3
votes
1answer
371 views

QGIS Print Composer Export problems

When I attempt to “Export as PDF” a Print Composer image, it hangs up until I press cntrl/alt/del, whereupon I learn that QGIS is not responding and needs to be closed. I’ve tried this as jpg, jpeg, ...
0
votes
1answer
81 views

gdal_contour creates an empty shapefile

I am running: gdal_contour -a elev hazard_interp4.asc haz_ak_contour_4_10 -i 10 the hazard_interp4.asc file has values in band 1 (singel band gray). With the above command, I get a shapefile that ...
4
votes
1answer
122 views

Automatically build branches of a river network?

A small non-profit, specializing in fish habitat restoration, has asked me to link a spreadsheet of field notes to their gis. What we have is: 1) A spreadsheet of field notes for small fish streams. ...
1
vote
0answers
157 views

Heat Map trouble: Is this a data formating problem?

I'm playing with the heat map plugin with QGIS. I've run through QGIS tutorial: http://docs.qgis.org/html/en/docs/user_manual/plugins/plugins_heatmap.html, using the airports data set as explained ...
1
vote
0answers
220 views

GeoTiff.lib: TiePoints only without ModelPixelScale do not get georeferenced in QGis

I have an image that has been georeferenced (geotiff.lib) by more than 3 tie points (x y 0 long lat 0 ...) and added following geotiff keys GTIFKeySet(gtif, GTModelTypeGeoKey, TYPE_SHORT, 1, ...
3
votes
0answers
129 views

How does Zonal statistics handle pixels that are on the border of the polygon?

I am using the plugin zonal statistics to calculate the sum of the raster cells within polygons. How does this plugin handle pixels that are on the border of the polygon, are those cell values ...
4
votes
2answers
118 views

One of my ID numbers for my polygon is not being shown when I label my layer. How do i fix it?

I have 20 polygons and when I tried to label the layer with the ID numbers only 19 appeared. For some reason my first polygons ID number is not being shown and I dont know why. Am I missing something ...
0
votes
0answers
394 views

How to upgrade from QGIS 1.4 to 1.8 on Linux Mint 12?

I've been trying to upgrade from the Enceladus 1.4 version of QGIS to 1.8 on a Thinkpad T42 running on Mint 12. When I try to upgrade from within QGIS help menu I receive the following error message: ...
1
vote
1answer
94 views

Problem loading raster to PostGIS using QGIS

I am having trouble loading a raster (.asc) file to PostGIS 2.0.1 using the plugin Database - PostGIS Raster - Load raster to postgis in QGIS 1.8.0 on Win Vista 64 bit. I get the following error ...
0
votes
1answer
126 views

gdalwarp cant find libproj.dlib

Thought I had finally got Python, gdal and QGIS to play nicely together but just tried to do a batch transform using a bash script to call gdalwarp and it claimed it couldn't read the libproj.dlib ...
2
votes
1answer
231 views

How to realign (PostGIS) layers in QGIS?

I'm trying to realign layers in QGIS. As you can see here, the "background" light-blue layer is not aligned with the top layers. I'm working with pgAdmin III and importing PostGIS Layers in QGIS. My ...
1
vote
3answers
2k views

Free Imagery WMS Feeds in QGIS

I was wondering if anyone knows of a free WMS of imagery that I could use within QGIS. The imagery does not have to be high resolution (Blue Marble even). I would like to have a base imagery feed ...
1
vote
0answers
62 views

When digitizing, objects are not saved well

I've some problems with digitizing. If I draw a line or a polygon, the line or polygon is saved in the attribute list, but not visible and its location is not saved either (when I zoom to the object ...
2
votes
4answers
308 views

How can I create polygons of the area surrounded by roads / lines?

I'm currently trying to create polygons that represent the areas surrounded by roads. The roads are stored in PostGIS as points / lines so I have flexibility over what I can do with them. I'm ...
1
vote
0answers
431 views

Distance Matrix in QGIS

Can anyone help me with the distance matrix tool in QGIS? Is there a tutorial about it? It sometimes crashes when I use it and the values that it produces seem strange. I am a beginner in QGIS, so I ...
5
votes
1answer
1k views

How to convert coordinates in a .csv into another CRS in QGIS

How can I convert coordinates which are stored in a csv and in a certain format in a different CRS, i. e. I want to convert GK 3 (EPSG:31467) into WGS 84 (EPSG:4326). I am using QGIS and already ...
2
votes
0answers
133 views

how to intersect a raster subset with a buffered vector layer (points) in QGIS?

I am a bit new in the GIS and qGIs sphere so maybe my question will look a bit naive, but at the same time it means it should probably be easy for most of you guys ;-) I work in QGIS.I have 2 layers: ...
1
vote
1answer
203 views

Qgis - Raster clip Problem

I tried to use the Raster (Extration) tool "clipper" and I always get this error log: What is my problem? Fehler bei der Ausführung von Python-Code: Traceback (most recent call last): File ...
1
vote
2answers
346 views

Is there a way to get correctly aligned print export with openlayers plugin?

I am a beginner using QGIS (1.8.0 Lisboa) on a Mac (OS X 10.6.8 Snow Leopard). I work on a file with two layers in the following sequence (top to bottom): a vector polygon layer with a few outlines ...
3
votes
1answer
869 views

How to convert shapefile to vector emf?

I want to convert a shapefile to an EMF file. The EMF file must be a vector image, not a raster image. Please suggest to me some good packages or tools. Thanks in advance.
3
votes
1answer
207 views

Why is my Polygon (WGS84) in SpatiaLite 4 not displayed by QGIS? [closed]

I made a polygon in a SpatiaLite 4 database as follows: INSERT INTO test_pg (id, name, geom) VALUES (3, 'test', ST_PolyFromText('POLYGON((8.556824 47.185269, 8.611009 47.185269, 8.611009 47.218568, ...
0
votes
1answer
69 views

Why does Print Composer take ages “Creating icon for file …”?

Every time I open a Print Composer, a box comes up, and text flashes by saying, "Creating icon for file [various random image files that I have on my computer]". It then pauses, and does it again, and ...
1
vote
1answer
169 views

Which horizontal unit is used on the table of the Profile Tool?

Does anyone knows what horizontal unit is used on the table of the "Profile Tool". Vertical is in meter but I don't know about the horizontal axis. Knowing the length of my profile, I tried to divide ...
1
vote
0answers
88 views

How can I snap 2 lines in QGIS so the st_distance between them is 0?

Sometimes when I snap the ends of 2 LineStrings together and I check the st_distance between those endpoints I get a value in the order of 1.1E-10 while at the same time when I check for equality of ...
0
votes
0answers
211 views

Does Polygonize in QGIS 1.8.0 work correctly?

Does anyone else have issues with the Polygonize function in QGIS 1.8.0. When i use it is to extract details from larger raster images, through raster calculator, then polygonizing the resultant ...
2
votes
1answer
1k views

QGIS Python version

I have brewed python 2.7.3 onto my Mac (Lion), and installed shapely via pip install shapely. The Polygonizer plugin, however, does not find the shapely library. I see when QGIS loads a Python ...
2
votes
3answers
1k views

Joining attributes of polygons and points by location in QGIS

I have two shapefiles.... points containing a number field 'response_time' a polygon grid of square polygons containing fields including 'PNTCNT' with the number of points per polygon, calculated ...
4
votes
1answer
183 views

How to include streaming media into an OpenGeo system to monitor live-tracked animals?

I am wondering how to include streaming media (video), or camera feeds, into an OpenGeo system to monitor live-tracked animals. I am currently doing so with different applications, but I want to do ...
1
vote
1answer
215 views

Does QGIS support vector Rubbersheeting? [duplicate]

The task is to rubbersheet two vector layers one with a projection like UTM WGS 84 Zone 45N
1
vote
0answers
46 views

Spatial adjustment for vector shp files in QGIS [duplicate]

How to do spatial adjustment for vector shp files in QGIS? I have a set of 4 cadastral maps of adjacent locations. I have converted them form DWG to DXF and then to vector shapefiles. They are not ...
1
vote
2answers
464 views

How to use a hillshade dataset in QGIS?

I received “Hillshade” data that I'm trying to use in QGIS. When I check the "Pseudocolor" option under "Color map", I get many colors, apparently corresponding to the terrain, though it doesn't ...
2
votes
1answer
144 views

How to symbolize points using line symbols of varying rotation and width?

I've been along a stretch of coast and recorded the orientation and thickness and locations of several igneous intrusions. I've managed to set up a project in QGIS with a point for each intrusion, ...
1
vote
3answers
449 views

Why does QGIS not detect the CSV/DBF column headers?

I am trying to import a csv or dbf into qGIS so I can perform a join on a shapefile. However, qGIS is not detecting the first row as header names. I know I've done similar joins before and there's ...
1
vote
1answer
94 views

How can I import ALOHA .pas plume file into QGIS?

I am trying to find a way to import ALOHA's plume model (.PAS) into QGIS? I have not been able to find anything showing how to accomplish this outside of using ESRI-based tools.
0
votes
1answer
159 views

Is it Possible to Convert a GRD File into an ASC File in QGIS?

Is it possible to convert in QGIS a GRD file (that was created in MapInfo) into an ASC file (that can be imported into SAGA)? Is it possible to "extract by mask" a section of a GRD file in an other ...
4
votes
1answer
220 views

How can I split a segment into two segments?

The problem is how to split segments or in other words how to insert new points into a polygon so that the segment where I created the new point is now two segments connected by said point. Every time ...
3
votes
1answer
156 views

Is there any way to have the legend text above the symbol and beside it, not just above?

Is there any way to have the legend text above the symbol and beside it, not just above? What i do at present is to cut the end of the text off and insert a label then group them, however i want to ...
4
votes
1answer
166 views

Where to report QGIS and QGIS-Plugin bugs?

I often find bugs in Qgis and its Plugins. I would like to ask about this on the internet but I do not seem to find the proper place to address this issue. Are there any instructions?
2
votes
2answers
101 views

Why does “save” overwrite the “capture point” function? [duplicate]

I am very new at using QGIS. I have the standard installation (no additional plug-ins). I have several polygons and each polygon is formed by a number of segments. What I am trying to do is to connect ...
3
votes
1answer
93 views

How to automatically create a map for each column of attribute table?

I have an atribute table with yearly data for 10 regions, is there a way how to automaticaly create a set of maps (one for each year) with fixed scale? I tried to search the web but perhaps I didnt ...
2
votes
1answer
453 views

generate height data from DTED maps

I have 16 DTED maps of (1 degree x 1 degree). I have to generate combined height matrix of maximum 4 (1 degree x 1 degree) DTED maps in my C++ application. Can someone suggest to me which open source ...
0
votes
0answers
45 views

Qgis on MacOS. Color picker does not show?

Style palette in my Qgis does not work. When choose Properties, Style on a Shape layer and click Change color only an empty dialog of 1 X 1 cm shows up. What do I do wrong? Mac OS 10.6.8, Qgis 1.8
1
vote
2answers
97 views

Preserving formatting of Scales & Legends in Templates

My QGIS templates don't seem to preserve the formatting of my scales or legends. Is there a way to save these so they don't have to be redone each time? (I'm doing a series of maps that will be the ...
2
votes
1answer
75 views

How to get WMS layer title instead of the layer name in QGIS?

When I connect to a WMS service in QGIS, the name displayed in the layers panel is the layer name. Can I configure QGIS to always display the layer title for WMS layers and fallback on the name if ...
14
votes
2answers
987 views

How can I merge/collapse nearby and parallel road lines (eg. a dual-carriageway) into one single line?

I have a shapefile from OSM which contains all the roads within a city. Larger roads (like dual-carriageways) seem to have 2 parallel lines. I'd like to collapse / combine those into 1 line so I can ...
2
votes
1answer
509 views

The “Add delimited text layer” button does not show (QGIS 1.8.0)

I want to create a point map layer on the basis of an CSV file with XY data, with the "Add Delimited Text Layer" button. However, this button does not show. Also, it is not possible to add an Excel ...
0
votes
1answer
316 views

How to fix AttributeError: 'QgsVectorLayer' object has no attribute 'provider'?

When I try to start this algorithm I get an error: Traceback (most recent call last): File "C:/Users/trdina/.qgis//python/plugins\sextante\core\GeoAlgorithm.py", line 145, in execute ...
0
votes
1answer
1k views

ecw on windows 7 qgis 1.8 [duplicate]

I used 1.7.4 qgis release on Windows 7, by which it was possible to manage ECWfiles; after passing to 1.8 release, I couldn't deal with an ECW file: it tells me that .ecw is not a supported kind of ...
2
votes
1answer
136 views

Can a Print Composer be “dynamic”?

Is it possible to create a Print Composer; then later, after altering the map that it is based on, go back to that print composer and have it show the altered map? In other words, I want to retain the ...
2
votes
2answers
638 views

Why are edits in shapefile table not saved?

I have created a shapefile (point data) and wish to change some parameters in the files table data. I can edit the data and see the coresponding change in my my symbology. However, when I save the ...