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

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36 views

HTML framework in GIS development version

I have a question. I need to insert an HTML frame in the QGIS developer version. That works very well. Now I will also create a title page as HTML. Now my question is which program I best create the ...
2
votes
3answers
276 views

Extrude Shapefile to KML based on field value

I would like to extrude shapefile polygons to a KML based on a value stored in the attribute table. I am hoping to do this using open source software (QGIS, FWTools, GDAL, etc.). I looked at ogr2ogr ...
-3
votes
1answer
205 views

How can I open georeferenced ArcMap raster files in Qgis?

How can I open georeferenced arcmap raster files in Qgis?
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0answers
77 views

Is it possible to use USGS .shd files in QGIS?

Has anyone successfully used QGIS with US Geological Survey shd files to map geology - specifically to display colors and geological symbols (dip/strike etc) stored in a USGS supplied shd file. ...
1
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0answers
54 views

How to measure area of polygons generated from gps data in qgis? [duplicate]

Somebody classified my question as a duplicate. But applying the answer doesn't work for me. Here is what I did: - I made sure that my layer is in a projected coordinate system (UTM30N, WGS84) - I ...
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1answer
1k views

How to fix “import qgis.core ImportError: DLL load failed” [duplicate]

I am trying to develop a GIS application in QGIS using the Python language. Unfortunately, I encountered a problem from the outset is that of import and qgis.core qgis.gui. the Problem in the python ...
4
votes
1answer
116 views

How to make raster cells with a certain value stand out in QGIS?

I would like to make my raster cells glow in QGIS. If I have a dataset where only a few pixels has a value, they can be pretty difficult to spot (unless I know where to look). Stretching helps a bit, ...
1
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1answer
134 views

Rendering order of layers in QGis libraries

I am using the QGis libraries in a external Qt App. When adding vector and raster layers (in any order) to the QgsMapLayerRegistry instance, it somehow sorts the layers so that the vector layers is ...
1
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0answers
65 views

wireless sensor network integration with GIS

I am working on a project in which I need to represent data on a map after collecting it from wireless sensors.The wireless sensors are placed in the field and it collects information regarding soil ...
0
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0answers
134 views

Vector layer and google map do not line up in PDF

I'm using qgis 1.8 with windows 7. When I use print composer to export as PDF, the google map does not line up with the vector layers. Please help.
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0answers
28 views

tin model in Qgis [duplicate]

I am having DSM and DTM data .My primary objective is to develope a CHM(Canopy Height Model) in Qgis.which i have done already but in my company they are stressing that CHM model which i already ...
2
votes
1answer
587 views

geoserver wms issues

My WMS on a local test server was working fine with GeoExplorer but suddenly stopped working and now I don't get the LocalServer in the datasources list. I have tried reboot/restart. I tried adding ...
2
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3answers
504 views

Has anyone compiled QGis for 64-bit Windows 7?

It seems to me that a 64-bit build would be a much desired version. Has it been done or are there Qt 64-bit compiler issues blocking the way?
0
votes
1answer
95 views

Custom forms and location of python code

I'm working with custom forms for the attribute table of various qgis-object and it works realy well, but I would like to have my forms and their python files separated from the projects. This is not ...
2
votes
2answers
762 views

Percentage of polygon in one shapefile within polygon of another

I'm a newbie, apologies if this is obvious/has already been asked and answered but I couldn't find anything. I have two shapefiles: 1. an administrative boundary layer for a county in the UK known as ...
0
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0answers
69 views

QGIS: “No data” raster value for missing rows conflicts with data?

I’m having a problem with specifying “no data” in a raster dataset in QGIS 1.8.0-Lisboa. QGIS does fine in interpreting pixels I don’t have rows for as “no data” if I set Layer Properties -> ...
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0answers
172 views

Install QGIS 1.9 on Fedora 19

I have tried the guide http://hub.qgis.org/projects/quantum-gis/wiki/Download yum install --enablerepo=updates-testing qgis qgis-python qgis-grass qgis-mapserver it shows only QGIS 1.8 is ...
2
votes
1answer
62 views

After joining data from csv file to shapefile, why are all values zero in categorized renderer?

I have joined data from a csv file to my shapefile. The attribute table shows a successful join. I have converted the variable of interest to INTEGER. But when I go through Style to categorize the ...
0
votes
2answers
99 views

How can I see average of raster value over certain area, marked by mouse?

I have a raster in Quantum GIS and I am just exploring it. How can I see average of raster value over certain area, marked by mouse? In other words: How can I select particular area in QGIS? How can ...
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0answers
56 views

Unwanted lines when cutting & merging polygons

I am using QGIS version 1.8.0. Sometimes when I cut or merge polygons I get unwanted lines left in them. On zooming in to them they do not appear to be slivers. Is there a way of getting rid of these ...
1
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0answers
353 views

Check if a point is near a linestring with MySQL Spatial Extension (untrustable)

I have to discover if a given point is at least 500 meters (ou other distance) from a route line that exist in my database recorded using the MySQL Spatial. I see there is no similar function in ...
1
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1answer
268 views

export openlayers as .shp file in Qgis

Is it possible to save an openlayers map as a shape or tab file in Qgis. I would like to have a part of an area from google maps as a shape file for later use?
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0answers
198 views

Styles from Geomedia (mdb with style library) to be used in qgis?

We are trying to move some projects from Geomedia Professional to QGIS. Since we have large style libraries (stored as mdb) we are looking for a way to convert the styles to a format that QGIS can ...
1
vote
3answers
955 views

How can I translate Modis HDF To GeoTiff

I've a MODIS04 L2, and I want to extract band 8:Image_Optical_Depth_Land_And_Ocean. I use Quantum GIS to open this band, because Quantum GIS see this is not coordinates so this allow me to select ...
1
vote
1answer
58 views

Why are attributes missing in overlay tab QGIS 1.8.0?

I want to add a diagram overlay onto a shapefile layer. When I look at the attribute table, all the correct columns are shown. However, when I open the layer property box, the attribute columns I want ...
1
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1answer
137 views

Sum of point attributes inside hexagons using QgiS UI

I'm very new to Qgis so I would very much appreciate any help you can give me. I have a point shapefile that corresponds to locations of animals captured. I've joined a table to this shapefile with ...
2
votes
1answer
536 views

How to zoom to a selected feature with pyQGIS

I want to create a function that selects a feature and zooms to it (similar in QGIS). Therefore there is following function: QgsMapLayerRegistry.instance().addMapLayer(self.vlayer) def zoomTo(self): ...
1
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2answers
342 views

How to develop a Canopy Height Model of LIDAR data in QGIS?

I am having a DTM and DSM files .I want to develope a Canopy Height Model in Qgis is it possible?
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1answer
63 views

How can I know the number of polygons in a selected area in QGIS

How can I know the number of polygons in a selected area in QGIS? Can I use the Select features tool? How can I use? Thank you
0
votes
1answer
464 views

How to read attributes in pyQGIS and QGIS 1.8 without setSelectedFeature

I add a vector layer to a map with QgsMapLayerRegistry.instance().addMapLayer(self.vlayer) later the attributes are read with def select_all(layer): layer.select([]) ...
1
vote
1answer
697 views

Where are the 3d analyst tools available in QGIS?

I want to know whether we can perform 3d analyst in Q-Gis? If yes, means where is that option present?
5
votes
1answer
187 views

Which GIS Software is Right for small manufacturing trends analysis?

I'm a graphic designer who has been tasked with choosing a mapping platform for the manufacturing company I work for. One of my colleagues began our project by using a trial version of ArcGIS to ...
4
votes
1answer
737 views

What dissolve tool in QGIS allows me to summarize statistics for multiple attributes?

Is there a tool or plugin in QGIS that resembles ArcGIS 10's Dissolve tool? I'm trying to dissolve several polygons (parks) around the boundaries of another layer of polygons (cities), while ...
1
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2answers
174 views

Stop rounding values in Qgis attribute table

I am calculating the areas of my polygons in Qgis using $area and everything works fine until I click on "save". All my values are rounded to an integer. I tired setting the output field type to ...
1
vote
1answer
200 views

How to compute area for polygons in an EPSG:4326 shapefile?

I have a shapefile covering the whole globe, in EPSG:4326 (geodetic WGS84). I would need to compute the polygons areas in a metric such as km2. How can I do that in QGIS or with gdal/ogr and having a ...
4
votes
1answer
606 views

How to get SAGA working with QGIS Sextante?

I just created my account on this forum to find an answer to a stupid (?) problem I can't deal with. First, let's precise I just (some months ago) learned on my own what GIS was, and gave it a try ...
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0answers
146 views

Point in polygon analysis fails with “TypeError: arguments did not match any overloaded call”

I am using QGIS 1.8 on Windows 7 I want to perform a point in polygon analysis using the Vector > Analysis Tools menu. My point layer is the result of a SpatiaLite query which returns 10'000 points. ...
3
votes
1answer
619 views

How to add CSV data with no coordinates to a polygon layer in QGIS?

I would like to add attributes from an spss database (around 300 cases) to a polygon layer in QGIS. Both datasets have a column with unique IDs. I exported the spss data to a CSV file which does not ...
1
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0answers
54 views

QGis overlap labels

I have a csv file imported into QGis 1.8 and this layer is receiving real time data.Into this attribute table layer there is a field which values i use to label it but overlapping all values when ...
1
vote
2answers
88 views

How do I adjust transparency on heatmap so that I can see background raster map? QGIS 1.8.0

I have created a raster heatmap for the first time, but I cant seem to adjust the transparency settings to let me see another background OS raster map beneath it. I have attempted to swap the ...
2
votes
1answer
91 views

Creating pop-ups on point layers

i have a postgresql database which is refreshed all 10 minutes and i need to create graphs in pop-up with the data. When i click, a pop-up (or annotation ?) appears. How can i make it possible ? ...
1
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0answers
60 views

Coxcomb chart in qgis

I would like to use special pie chart for my map, where the angle is not important, but area or radius of the arc carries information. I found, that this type of pie chart is calling ...
0
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1answer
315 views

How to use a database in Qgis

What is the primary use of database in Q-Gis? How to connect to a database in Qgis?
0
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1answer
200 views

convert shapefiles to cad files

hi i'm having a difficulty in converting shapefiles to cad file. i'm currently using the ArcGIS 9.3.1 version and i tried to convert it using the toolbox>conversion tool>to cad>export to cad....the ...
3
votes
1answer
356 views

How to add complex Emergency Symbology (TrueType fonts) to QGIS?

In other packages I would simply ensure the TrueType font (+.ttf) was loaded on the operating system and it would be available for use. QGIS seems to rely on making your own. The symbols I wish to ...
0
votes
1answer
77 views

Can this compilation and display of species frequency data be improved? QGIS 1.8.0

As a newbie on QGIS, I would like to find out if the way I put a species frequency map together could be improved upon. I had to map the presence or absence of 7 plant species surveyed in 30 2m x 2m ...
5
votes
1answer
821 views

Identify polygon overlaps within single shapefile

Using either QGIS (1.9) or ArcInfo (9.3.1) I'm trying to identify unique overlaps of prehistoric building footprints from an archaeological site recorded within a single polygon shapefile. While the ...
1
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2answers
92 views

Why can't I save csv as a shapefile

I am trying to follow the instructions given here, Tutorial: Making Heatmaps using QGIS and GRASS , to build a heat map with my own data. I taken the first step and imported a csv data table into the ...
0
votes
4answers
152 views

How can I calculate different polygons by different attributes?

I'm doing my master thesis and want to calculate different polygons (in QGIS 1.8 for Mac) in four different columns which I defined by different attributes. i.e. some of the attributes in the first ...
0
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1answer
127 views

Compile Qgis source : Links errors (Windows)

I am actually trying to compile the source of the qgis git : https://github.com/qgis/Quantum-GIS In order to compile it, I follow the steps of the tutorial here : http://www.qgis.org/api/INSTALL.html ...