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

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4
votes
1answer
521 views

How to transfer styles from QGIS to ArcGIS?

We have a QGIS project that has symbols for a lot of different lines. Data comes from a geodatabase that is accessible to both QGIS and ArcGIS. We now want to use the symbology of the QGIS project to ...
0
votes
1answer
43 views

Is the rule-based styling not supported on the server?

I have been using the rule-based option to style some of the layers (from a postGIS database) in my qgis project. Then I put the project on the server and when I checked the WMS connection in QGIS, I ...
2
votes
1answer
743 views

Saving vector layer with specific symbology

I am creating a polygon feature layer with soil classes. I need to share this layer with some colleagues and I need the layer to maintain the color ramp I have created. Is there any specific format ...
2
votes
2answers
373 views

QGIS 2.0 Atlas Generation: Can I force the selected feature to be the last one rendered

I have a layer with a number of features that represent zones which share some boundaries with others. I am using Atlas generator to produce a set of maps, one for each zone extent. The zones are ...
2
votes
2answers
152 views

Merge point features within a given radius [duplicate]

I have a file in QGIS with 5000 points. Some of the points are really close to each other (5m). How can I cluster the point features to one point feature if they are within 5m? The new points should ...
0
votes
0answers
82 views

QGIS, SpatiaLite and GPS integration

I have QGIS an, access database and a Haicom gps all connected and running on a windows 8 machine. I want to integrate all 3 items so that while in the field i can enter information into the ...
3
votes
2answers
791 views

How to resize the map item in QGIS print composer without changing scale?

Is it possible to lock the scale in the QGIS 2.0.1 print composer? Every time I resize the map, the scale is adjusted. This makes trying out different map layouts really annoying.
1
vote
2answers
245 views

Calculate logarithm of a raster?

I'm trying to calculate the logarithm of each cell in a raster. Is there a way to do this with F/OSS GIS? gdal_calc.py only has basic operators and the QGIS raster calculator feature doesn't seem to ...
3
votes
2answers
168 views

Calculate distance in QGIS, wrong geographic projection?

I'm trying to do the following: I have 2 shapefiles, one containing all the public schools in NY, another one containing the hotspots in NY (both in points form). Now what I'm trying to do is ...
1
vote
1answer
126 views

How to get the direction raster from r.walk or r.cost

I am trying to use r.cost and r.walk and r.drain to calculate the shortest path from an archaeological site to the nearest basalt source. I am using all this algorithms with the processing toolbox (I ...
2
votes
1answer
300 views

How to create a symbol with graduated marker size and line width in pyQGIS?

I am using QGIS + pyQGIS + Python. Layer geometry is line. Each line has a magnitude and a direction (from 1st node to 2nd node). What exactly I want to perform is "graduated width marker symbology ...
2
votes
2answers
108 views

Save multiple selection sets in QGIS

I'm looking for a feature in QGIS but I am not sure if it exists. I don't know the name of such feature, but I call it multiple selection sets. It exists in TransCAD and I find it very useful. It ...
0
votes
2answers
722 views

Using OS Mastermap SLDs in QGIS

In an answer to a question asked by @Canningmister, @tjmgis posted an excellent answer Styling OS Vectormap Local in QGIS? about making OS SLD files work in QGIS. As an amateur user who uses QGIS to ...
0
votes
2answers
192 views

How to derive point height from contour data?

I got vector layer that represents height over sea level. Then, I also have different vector layers. Is there any good way of using QGiS or things related to calculate sea level for those points? ...
2
votes
4answers
598 views

QGIS Polygon precision

I have a fairly straightforward question; is there a way to edit the precision of polygon points in QGIS so that each coordinate has the same number of decimal places? For example, the coordinate ...
0
votes
1answer
431 views

How to zoom to the extent of Qgsvectolayer qgis?

Anyone know how to zoom to the extent of a Vectorlayer in qgis using python plugin?
1
vote
1answer
246 views

Simple Spatial Join of Point Feature to Polygon Target Feature Not So Simple (Source Files Included)

I have what should be a simple task to perform: join ~47K census blocks from the PL redistricting files with pop and racial data joined to Chicago Public Schools High School boundaries to get an ...
1
vote
1answer
116 views

How can I add a pdf as hyperlink for a point in QGIS? Can I do the same in GVSIG?

I am working on a project for which I would have to make a map displaying all archaeological sites of the city; it will later be used and accessed by my office's stuff only. In the end, when clicking ...
0
votes
3answers
705 views

Seeing lat, lot coordinates in raster and getting pixel value

I am new to QGIS and I have a simple question. How can I get the pixel value at a given latitude and longitude coordinate in a satellite raster image? Related to this, I cannot see the latitude and ...
2
votes
3answers
263 views

Problems displaying reprojected WMS in QGIS 2.0.1

I'm loading a WMS layer in QGIS 2.0.1 using the coordinate reference system SWEREF99 TM EPSG:3006, a Swedish crs. The layer displays in the map but when I zoom in to Sweden using the Zoom in-button I ...
4
votes
1answer
210 views

GDALWARP and OGR2OGR / CS2CS not agreeing on transformation

I am trying to transform some data (both raster and vector) from WGS84 to a Croatian Coordinate system defined by: +proj=tmerc +lat_0=0 +lon_0=15 +k=0.9999 +x_0=5500000 +y_0=0 +ellps=bessel ...
0
votes
0answers
35 views

qgis build under ubuntu 12.04, but all the python plugins are not there

All the .so plugin show correctly, only the python plugin do not. I am confused and do not know how to fix this. I think there must be some python problem . The build process is successful.
0
votes
1answer
196 views

How to display coordinates of a point in a projected cooridante system?

I want to check the coordinates of a point. On selecting this point in ArcGIS it displays a latitude and Longitude . In ArcGIS I found an option in 'Identity Tool' that the Latitude and Longitude ...
0
votes
1answer
73 views

WMS orthophotos not visible on screen

Using QGIS on Windows XP based desktop. I have been loading orthophotos from a WMS server up to yesterday morning. Today QGIS correctly connects to the server and apparently loads some bytes, however ...
4
votes
1answer
1k views

What is the distinction between Difference and Clip in QGIS?

What is the primary distinction between the Difference and Clip geoprocessing tools in QGIS?
2
votes
0answers
112 views

How can I improve the resolution of a vector grid made in north pole stereographic projection?

I've been struggling with this for a while and wondered if someone could lend a hand. I have a map which already has sampling points from centroids in a 35x35km grid that was created in north pole ...
1
vote
1answer
271 views

Field Calculator returning incorrect length and area values

I can get accurate lengths of line features and areas of polygon features using the "Measuring Tool" in a QGIS project. However, when I attempt to generate length or area data in Attribute Tables ...
1
vote
0answers
81 views

qgis 1.8.0 crash when starting qthread

I am trying to update a vector layer attribute table using QThread. i connect a pushbutton click with a slot to start the thread: def EGSupdateAttributeTable(self): AttUpdateEGSThread = ...
1
vote
1answer
59 views

Re-sizing Raster file pixels

I have 2 JP2 aerial imagery files that are incorrectly sized. They are 100x larger than the other aerial images but correctly geo-referenced (starting x, y co-ordinates). I believe the issue is their ...
0
votes
1answer
38 views

Apply style to second field

I created a point shapefile in QGIS 2.01. Then, I changed the style of the points so they display the contents of the Acceleration field in the attribute table. Works exactly as I require. Now I ...
1
vote
1answer
229 views

QGIS EasyPrint alternatives for v2.0.1?

I recently upgraded to QGIS v2.0.1 and noticed that the EasyPrint plugin is not supported for the latest version. Will this plugin be updated to work in this version, or are there any alternatives ...
1
vote
0answers
63 views

How to auto-fill a new point vector in a vector layer?

When I work in-situ I manually add points in my shape-file. I would like that when I add a new point some attributes would already filled with values calculated programmatically. E.g in my first ...
0
votes
1answer
45 views

Inserting attribute table into QGIS Composer is limited to 99 rows

Inserting attribute table into QGIS Composer is limited to 99 rows? Or am doing something wrong? Stems from How to import or incorporate formated Excel tab into QGIS print composer
1
vote
1answer
137 views

How to set field values as labels in QGIS2 Print Composer

I am mapping the distribution of 325 bird species, displaying circles in the grid cells each species occurs in. The data contains as many duplicates of the NAME as there are cells in which it occurs. ...
0
votes
2answers
321 views

How do i draw a route on Quantum GIS between nodes?

I have a requirement to trace path on the points present in the shapefile which is loaded in Quantum GIS. This should enable the user to specify their own routes within the present network. There ...
0
votes
0answers
153 views

how can i read an attribute value from qgsfeature?

How can i read an attribute value from qgsfeature ? i am trying to update some attribute using other and i have to read value from attribute in the qgsfeature . my source code: provider = ...
3
votes
3answers
341 views

QGIS spatial join, calculating distance from polygon to point layer

I am trying to perform a kind of 'spatial join' in Arcgis, joining to a polygon layer atributes of the closest feature of a point layer, as well as distance. But 'spatial query' doesn't offer an ...
1
vote
3answers
190 views

Research study participant mapping and analysis - comparison of software

I am new to everything GIS. I have been researching different software but have found more questions than solutions. What I want to accomplish: I'm working on a research project with participants ...
6
votes
2answers
2k views

Resources on using R in QGIS for R users?

This is a very basic question, but I'm having a heck of a time figuring it out because so much of the QGIS documentation is oriented toward use of the GUI. I want to be able to run R scripts in QGIS, ...
1
vote
1answer
509 views

How to activate a layer in QGIS layers legend

How can I activate a layer in qgis map legend automatically using python code . I am using qgis.utils.iface.setActiveLayer(self.theLayerToEdit) but the layer is still not checked in the maplegend. ...
1
vote
1answer
151 views

Species atlas (how to automate to create on page for each species with QGIS)

With the use of QGIs, I would like to create an Atlas for a batch of species, with: a background with the country (from a vector layer or from the openlayer plugin). a vector layer (polygon) to show ...
2
votes
1answer
91 views

Raster layer calculator

In PCI Geomatic, I have two raster layer.raster1 identified like %1 and raster2 like %2. if (%1 <= 10) then %2 = 60 elseif (%1 > 10 and %1 <=50) then %2=80 elseif (%1 > 50 and %1 ...
0
votes
2answers
60 views

Error point sampling tool

I'm usig QGIS 1.8.0 and I did some interpolations. Now I want to do some sampling with the point sampling tool but I keep getting this error (I attach a picture of the error message). Does anybody ...
0
votes
1answer
82 views

Missing a Geom field in PostGis

I am working in a Database preaparation for that I exported a shapefile from Qgis to PostGis.The Problem is this: In Qgis I can see a Polygon feature but when the same polygon feature is exported to ...
2
votes
1answer
178 views

How to create an animated map in QGIS which cycles through column values

So i have a shapefile with 40 polygons(rows) and 30 columns where each column represent values from different time period. I have created a map with graduated style by choosing values from one column ...
2
votes
2answers
453 views

How to load memory output from QGIS processing?

Many processing algorithms have an option to save output as memory. If ran from toolbox, this works fine, because you can tick the "Open output file after running algorithm" box. Looking at the ...
1
vote
1answer
186 views

QGIS-server and mapproxy. Management of the transparency of a layer

I have problems using mapproxy with QGIS-server via openlayers (mapproxy-1.6.0, qgis-server 2 and openlayers-2.13.1). I have a layer in which i defined the background of the polygon with ...
1
vote
0answers
162 views

Ecw not supported with qgis-mapserv-fcgi but supported in QGIS Desktop - resolved

I have problem with qgis-mapserver version 2 and ECW. Qgis Desktop works well with ECW (gdal support for ecw with the library ERDAS_ECWJP2_SDK-5.0) but not qgis-mapserver (not supported file in ...
1
vote
0answers
117 views

Touch up tool for rasters?

I was wondering if it were at all possible to manipulate/massage rasters (eg Geotiff) using Qgis plugins or Grass?? By manipulate, I mean manually smooth off interpolation artefacts, blended surface ...
0
votes
0answers
135 views

Points warped when exporting to shape file (position off in Qgis when imported)

I have just purchased a used Trimble GeoXH and I have done some surveys. I did the differential corrections in Trimble Pathfinder Office 4.10. I have exported the corrected and uncorrected files and ...