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

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21 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 ...
2
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0answers
28 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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1answer
26 views

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

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
22 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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0answers
27 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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23 views

How to solve problem of non-ascii character on a zipfile on a plugin? [on hold]

I'm making a plugin that needs extract files from a zipfile before processes them. For this I'm using zipfile lib. The ZIP file contains filenames with non-ascii chars. If I run this code on a "QGIS ...
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1answer
14 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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0answers
33 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
10 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
16 views

strange raster calculator behavior in QGIS

I used to work with qgis 2.8.1 in Lubuntu and in windows7. Each time I try to multiplicate a map for a number comprise between 0 and 1 (i.e. 0.1) I get a good results on windows OS, but I get a map ...
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0answers
14 views

QGIS Crashing on android Tab 3

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
29 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 ...
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0answers
24 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 ...
2
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0answers
24 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
17 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 ...
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0answers
49 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 ...
1
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1answer
17 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 ...
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0answers
13 views

Calculating Odd and Even side of road using PyQGIS and GRASS

I'm trying to programmatically and automatically assign odd and even sides of a road to number homes using QGIS and GRASS. I noticed this other post, which gives a solution using PostGIS and I have ...
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0answers
27 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
18 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 ...
1
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1answer
48 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
16 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
24 views

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

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, ...
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0answers
18 views

QGIS shuts down when I try to open a “.sos” file

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
30 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 ...
2
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1answer
43 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 ...
1
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1answer
51 views

“Get” results of PostGIS [on hold]

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
16 views

Negative reflectance values from raster calculator computation of GeoEye-1 image

I tried to convert DN values of a pansharpened 2010 GeoEye-1 image into radiance then reflectance in QGIS using raster calculator with the following formulas: (1) L= gain* DN + bias; (2) p = pi* L* ...
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0answers
23 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
votes
1answer
62 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
21 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 ...
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0answers
24 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 ...
1
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1answer
17 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 ...
0
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1answer
21 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
34 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? ...
1
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1answer
26 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
13 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 ...
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0answers
23 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. ...
2
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0answers
20 views

QGIS 2.8 Plugin Icon not Showing in the plugin information pane

I created a QGIS plugin with Plugin Builder. Even though the icon set in the metadata.txt is displayed in the Plugin Manager list (left to the plugin name in the installed plugin list), it is not ...
1
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1answer
18 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 ...
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0answers
4 views

Load and View Layers with Specific Symbology in QGIS form

I want to create a form to access my desired layers with defined symbology through some push Buttons in QGIS. when you click a button, specific layer with a defined symbology will be shown, Could you ...
2
votes
2answers
28 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
46 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
39 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 ...
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0answers
21 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, ...
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0answers
40 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
22 views

How to set qgis custom forms size?

I'm facing an issue close to the one posted there : Stop custom attribute form from resizing in Qgis with QGIS 2.8.2. I've got two layers with custom forms. Layer 1 form is much bigger than layer 2 ...
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0answers
11 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
16 views

Showing the composition in QGIS [on hold]

I´m currently using QGIS 2.8.1 and have create a plugin with the pluginbuilder. I´m trying to create a composed layout and want to show the layoutcomposer to the user at the end. I´ve done the ...
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0answers
16 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?