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

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192 views

Training Manual 2.8 and exercise data differences

I am a new user and trying to teach myself about QGIS using the 2.8 Training Manual and the training_manual_exercise_data downloaded from QGIS. I am using the PDF of the manual, which seems to be ...
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1answer
57 views

Grass r.out.gdal, wrong values when importing to QGis

I have a problem with export/import functionalities between Grass and QGis. I create a raster file in Grass (with r.wind.sun, but that most likely does not matter) It has the following properties: ...
2
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1answer
58 views

How to create a raster of equidistant points with distance in meters using QGIS?

I need a set of equidistant points (like a raster) each in a 1km distance to the next over a certain area, in my case Germany. I know the feature "regular points" in QGIS where I can do just that but ...
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0answers
30 views

How to best import a US Map Schematic?

I would like to use the following wiki US Map schematic as a background to my map work. (http://en.wikipedia.org/wiki/File:Blank_US_Map.svg) It is a .svg file, and GeoReferencer is unable to import it....
2
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0answers
36 views

Is there a way to make the controls on QGIS android larger?

Is there a way to make the controls on QGIS android larger? e.g. When typing text into a field in the table view it is currently very small. I also have a issue/bug where the panels (layers, gps ...
3
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1answer
345 views

How to interpolate raster to get finer resolution?

I am working with precipitation raster layer. It happens the raster data to be in a resolution of 0.25 degrees grid. How could I interpolate those pixels to have a better resolution, say, a resolution ...
3
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0answers
100 views

Visualizing variability in the size and shape of polygons

I am working with a data set of area restrictions imposed by criminal courts. These restrictions ban a person from entering a demarcated area. These restrictions vary in their size, shape, and ...
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2answers
109 views

Why is the vector style in the PDF export different than in print composer? [closed]

I'm exporting a map to PDF in the print composer. See the map in the print composer As you can see, the top map is different from the bottom; the top has 10 tracts shaded in, the bottom has 6. Now ...
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0answers
64 views

What can I do to reproject rasters without modifying the original values?

I downloaded a series of Landsat 8 Images and I will be using QGIS to process them. The projection of 2 of them are incorrect, so I used "Warp tool" in QGIS to change them. The resulting rasters DO ...
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1answer
161 views

Why does my hillshade .ovr display in lower resolution in QGIS?

I have viewed a lidar terrain model hillshade .ovr file on QGIS and Arc and Arc has significantly higher resolution than QGIS. Any thoughts as to why this would happen and ways to enhance resolution ...
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1answer
354 views

How do I import a NMEA file into QGIS 2.8?

I have some NMEA data recorded in a file - this is not a realtime application. How do I import that into QGIS 2.8?
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1answer
213 views

Trouble Converting from a shp. to gpx file and up loading to GPS

Currently I have a series of random points within a shapefile that I would like to upload to my GPS. Every time I try to upload the points via "Save file" it come up with an error message (posted ...
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0answers
114 views

QGIS, GDAL Georeferencer missing?

I've just installed QGIS 2.8 on the new Fedora 22 (64) that came out some days ago. Awkwardly, I can't find the GDAL Georeferencer that, to my knowledge, is supposed to come with every installation. ...
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0answers
83 views

QGIS Crashing on android 4.2.2 Tablet

I have installed QGIS on my Samsung Tab 3 Neo (SM-T111)(android 4.2.2) from Google Playstore.It Installed with Ministro Qit & library files. It is opening with QGIS 2.8 (Wien) Logo but closing ...
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1answer
46 views

OpenStreetMap (OSM) data is misregistered upon download, in just one area?

I have a satellite image over the area of Forez, France. I checked that the landmarks on the corner points coincide with the landmarks of Google Maps at the same coordinates, so the image is not ...
3
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0answers
1k views

Exporting QGIS styles to SLD for GeoServer?

I´m starting to dive into sld creation for Geoserver 2.7.1 Therefore I´ve also looked at Qgis 2.8.2 as it can export styles to SLD. Where I´m clueless is the big amount of used prefixes/namespaces....
3
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1answer
117 views

Interpreting results of QGIS intepolation and Heat map from point shapefile

I have taken a step interpolation and heat map of the data point shapefile (building Centroid) with QGIS ver-2.8.1, as shown below. My question are: What is the difference of the two methods? How ...
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0answers
116 views

How to use a PostGIS sequence in QGIS editing session?

I can't seem to get the sequence on my PostGIS table to increment to NEXTVAL in a QGIS editing session. My PostGIS table is defined as: CREATE TABLE qgis_topology_editing_test ( geom geometry(...
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0answers
301 views

How to convert X and Y coordinates to longitude and latitude?

I have looked at every single one of the answers about this question and none of them seem to work. I have downloaded a shapefile with points that represent specific buildings into QGIS. I would like ...
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1answer
35 views

Not all polygons removed when cutting from vector layer in QGIS

I have created ten polygons representing lakes on a vector layer, and I am trying to cut them from an imported and re-projected vector layer of administrative districts. When I use the 'Cut with ...
2
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0answers
76 views

Spread overlapping points with similar but not identical coordinates

I've been looking for a solution for my problem for quite a while, but never found the answer.I have a lot of data point which are very close to each other, a lot of them have the same coordinates. ...
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3answers
64 views

Join attributes by location doesn’t appear to be including data that it should

I am trying to calculate the number of bus stops which are within 400m of c. 100 properties that are in relatively close proximity to one another. Using MMQIS I created the 400m buffer for the ...
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1answer
93 views

delete a space with the field caculator

I would like to delete the space in this number like this 'F00 089' with the field-calculator. Is theres a function in the field-calculator? ! see my screenshot
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0answers
31 views

Display graduated QGIS buggy?

I counted points in polygons in PostGIS like this UPDATE hexagons SET count = (SELECT count(*) FROM points WHERE ST_Within(points.geom, hexagons.geom)); That came back with that UPDATE 1554 That ...
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1answer
138 views

why the values are NULL if I join the csv table to a point shp file [closed]

So my problem is all values are NULL if I join my csv-table to a point-shape-file. (QGIS) Why? I tried so much thing but I can not find and handle the problem. I have customer names in the csv, ...
2
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1answer
280 views

How to open a “.sos” file without crashing QGIS?

I am trying to open a ".sos" file in QGIS. I have QGIS installed using OSGeo4W and added the gdal-sosi package. This should do the trick. But QGIS just shuts down when I try to open the file. It ...
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0answers
227 views

How to ceate new vector layers / save output in QGIS scripting?

I need to create a script in QGIS which stores outputs. In this case, official documentation didn't help to me. When I use geoprocessing (processing.runalg()) for vector layers. In some cases, output ...
3
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2answers
170 views

Is there a way to have spaces in QGIS leaflet web map layer names?

When I export a QGIS project to a leaflet webmap using QGIS2Leaf, is there a way I can have my layer names display with spaces. So for example in the image I would like OffshoreSACS to display as ...
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1answer
61 views

“Get” results of PostGIS [closed]

I am getting warm with post PostGIS. I am working in the Command Line. What I am wondering is how do I "get" the results of PostGIS. So imagine I have this select name, neighname from neighborhoods ...
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0answers
130 views

Preprocessing GeoEye-1 in GRASS iatcorr

I am trying to do a study on land use change using three high-res images of an area from three sources (Quickbird, GeoEye-1, WV-3). I have managed to calibrate the Quickbird data using QGIS raster ...
3
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1answer
139 views

How to center continuous raster layer by subtracting mean and dividing by standard deviation using QGIS raster calculator?

I'm trying to extrapolate a spatial model to a map in QGIS using the raster calculator. The model predicts the value of a pixel given the environmental conditions at this location (e.g. elevation, ...
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1answer
63 views

Exporting KML from QGIS with relation (one-to-many) table as popup

Here is a challenging one for someone. I have two tables in QGIS. Holes (parent) - Which contains the borehole locations. Strata (child) - which has many rows that contain the strata for each ...
2
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0answers
135 views

Least cost path analysis : a lot of sources and destinations

I'm working on a 15*10 km area, splatted in a 50*50 m cell grid. I want to compute the time needed to travel from a single starting point to each cell centroid, combining driving and walking time. I ...
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1answer
48 views

How to create a rule-based gradient using an expression

I am mapping points with values from 0-100 and want to display these using a gradient color scheme. However I also want to specify the breaks as regular intervals along this range. For a gradient QGIS ...
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1answer
402 views

How to update raster color ramp with new min/max values using PyQGIS?

I'm trying to update a single band psuedo color renderer with new min/max values from the python console. All the code samples i have been able to find deal with constructing a renderer from scratch, ...
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2answers
99 views

Changing style in ModelBuilder?

Is it possible to have the output features of a model have a specific visual style? The features come out in a random assortment of colors and very small. Is there a tool for this? or any suggestions?
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1answer
64 views

Pulling a cvs file from a website into QGIS with the ability to automatically refresh.

I am attempting to pull a cvs file from a website that is updated daily. I would like to have a process that can automatically perform the process and save daily as a new layer. The cvs file is ...
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0answers
64 views

Add save/commit button to custom feature from

I would like to add a save/commit button to a custom QGIS feature from. This is very helpful when there is a linked table dispayed on the same form - the link will work only once the main table has ...
2
votes
1answer
871 views

How to fill holes/missing values in XYZ data / a DEM with QGIS?

I have equidistant XYZ point (text) data that I used to create a point grid. However, it's not perfect - there are some holes. I then created a DSM raster from it, which obviously has the holes too. ...
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1answer
106 views

Transform from Lambert Azimuthal “old” to ETRS89_LAEA

I'm currently struggling to convert a small .asc dataset with no defined projection. The projection that has to be first applied is Lambert Azimuthal "old" projection: In PROJ.4 +proj=laea +lat_0=48 +...
2
votes
2answers
142 views

How to link polygon features in one layer to polygon features in another, using largest overlap in QGIS or GRASS [duplicate]

I have two polygon layers: the first one contains small land lots (green in the image), the second one contains large zones (the purple line in the image attached separates 2 such zones). I want to ...
2
votes
4answers
454 views

How to create different size of bubbles with different colors? [duplicate]

I have a set of points with fields like 'TYPE','SIZE','SALES VOLUME',what i would like to do in QGIS is: Apply different color code by 'TYPE', Apply graduated size of bubble circles based on 'SIZE' ...
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2answers
166 views

How to stylize KML layers for Google Maps?

I am using QGIS 2.0 to convert my shapefiles into KML layers. The purpose of converting my shapefiles into KML layers is to bypass the restriction imposed by Google Fusion Maps, which only allows ...
1
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1answer
119 views

Distance Matrix analysis for QGIS 2.8 using one layer

I'm using QGIS 2.8's Distance Matrix tool to find distances to nearest neighboring points on a single layer. I've followed roughly the instructions on this site and adapted it to my needs. However, I'...
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0answers
84 views

Point to raster: QGIS vs ArcMap

I have an equidistant point grid (0.5m) and created a raster from it in QGIS and ArcMap, with different results: QGIS: Raster -> Conversion -> Rasterize Result: raster, with points in the top left ...
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0answers
21 views

Default item on legend for QGIS

when I make a legend in QGIS, everything shows up how it should except for one item. The item is just a pale brown color that says "default". I can't find this item in any of my layers and have no ...
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0answers
54 views

How to run the QGIS viewshed plugin from the console?

I want to run the viewshed plugin from the console/ in a script in QGIS. Do you know if this is possible?
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0answers
97 views

How to pull data from multiple databases via Qt .ui form?

Using a single .ui form and wthin QGIS, can I show multiple records from another table that is associated with a single polygon? Table 1 contains planning applications ref Table 2 contains multiple ...
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0answers
10 views

Plugin c++ - QGIS [duplicate]

I'd like to know how can i create extension in c++ by using QtCreator, for QGis 2.8 ? Thank you for helping me.
2
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2answers
523 views

What is “Simplify tolerance” in QGIS's Simplify geometries tool?

I am trying to use QGIS 2.8 to simplify vector geometries. But I do not understand the significance of the Simplify tolerance value in the Simplify geometries tool. The documentation does not ...