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

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12 views

Gis2web - QGIS plugin troubles

I have QGIS 2.6.1 and when I want to get some results using gis2web (by Tom Chadwin) plugin, in fact, to get a webmap in OpenLayers, it seems that plugin doesn't work properly. E.g. I have a point ...
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1answer
25 views

r.report giving only per-class cell count

I'm trying to extract the count of each pixel value in a raster, like in this question: How to extract pixel value counts from a raster in QGIS? However, when I run r.report (from QGis (2.10) ...
2
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1answer
34 views

QGIS Contour Plugin Says No Shapely; can import shapely in QGIS console

I'm keen to create some contours (isochrones for a pedestrian 'ped-shed' catchment) from a point dataset in QGIS, using the contour plugin from the Plugins repository. I installed the plugin, but ...
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20 views

Missing items in DXF from QGIS export

I'm new to QGIS so this might be an easy answer. For my masterthesis I need contour lines of quite a large area. I imported an .asc file into qgis and used the contour command to get the contour ...
2
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0answers
16 views

QGIS TimeManager plugin: how to define the settings from the python console?

rather than defining interactively the 'Settings' of the QGIS Time Manager plugin, I would like to have the possibility to set them using the python console. This would save a lot of time in case one ...
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1answer
24 views

Checking the registration accuracy of already-orthorectified images

I acquired several Landsat 5-8 images corrected at Level 1T. I also have aerial ortophotos of the same area. From a visual assessment the co-registration between the images seems good, but I need to ...
2
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1answer
33 views

QGIS Python Identify Locations within a Polygon

I have a series of locations stored within a Vector layer and want to write a query to understand which of these locations fall within the polygons from another layer using the QGIS Python console. ...
3
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1answer
36 views

QGIS - Adding Raster Data to a Scanned Map

I'm a bit of a novice to QGIS, so apologies if this is a silly question: I've scanned a geological map into QGIS, which shows different types of rock in different colours. It's a raster layer, and ...
2
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0answers
23 views

Converting Memory Map *.qct files into QGIS?

i have created a bunch of raster base maps in Memory Map software (ie georeferenced tiff's) that are Memory map specific format (*.qct). Is there a way to import these or convert these into QGIS at ...
2
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0answers
54 views

Qgis 2.10-kml is not a valid or recognized data source

After upgrade from Qgis 2.8, importing the kml format doesn't work. The Kml file is not problem, because it works well on other computers. I tried to reinstall Qgis, but the problem is still ...
4
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1answer
93 views

Creating shapefiles using textfiles in QGIS

I have a shapefile in QGIS which has polygons in it . There are several other attributes for each feature . I want to add another attribute to each feature . The value for this attribute is available ...
2
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0answers
21 views

QGIS in server client architecture

I have downloaded QGIS version Lisboa 1.8.0. I created a server-client architecture where one PC acts as server, in which QGIS is installed, while the others act as clients, which don't have a CPU. I ...
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2answers
45 views

Rasters loaded in Postgres/PostGIS using raster2pgsql contain blank lines

I recently set up an Ubuntu Server as a Postgres/PostGIS database server. In an effort to serve a collection of aerial photos to my colleagues, I loaded 608 GeoTiffs (non-overlapping 1km tiles each ...
2
votes
1answer
64 views

Export QGIS map for Google Map

I made a superbe map with QGIS that I really would like to export in Google map format (Zoom/X/Y.png). I search everywhere and no comfortable answer was found. For now, I am making a map using ...
2
votes
1answer
53 views

How to reproject manually created label positions?

I changed position to some features' labels and I activated the x,y position in the label properties. I saved the layer in .shp and with another projection. Once created a new project with that ...
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0answers
30 views

How to create MBtiles from geoserver

How to generate mbtiles in geoserver? using openlayers for displaying geoserver layer for example calling wms layer like this new OpenLayers.Layer.WMS("Kanpur", ...
2
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2answers
57 views

how to snap points to lines in QGIS/PostGIS?

I'm attempting to snap approximately 900 points to a line table. I've tried recreating what I have found from a couple of PostGIS answers but not having much luck. To test, I've created two ...
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1answer
48 views

More functions in my plugin

I created my plugin with Plugin Builder in QGIS. It works great. Now I want to add more functions (http://qgis4dummies.wdfiles.com/local--files/grass-plugin/01_nuovo_mapset_grass_qgis.png like in this ...
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1answer
51 views

Does moving vertexes split them?

When i try to move my vertexes from my line feature in QGIS 2.10, the line is getting "separated", also when i delete the vertexes my line is getting holes. Any ideas why?
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0answers
28 views

Creating shapefiles using java?

I have a running java service which gives me a count corresponding to every 5-digit zip code in Newyork state. Now i want to feed this input to QGIS programatically so that the color of every polygon ...
0
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0answers
29 views

QGIS Slow to Save to Network Drive

Do other users find that QGIS is very slow when saving to a Network Drive location? Saving locally is instantaneous, saving the QGIS project to the network takes over 1 minute every time. Saving the ...
0
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1answer
29 views

How to extend a (river water level) raster, transfering its values to the added area?

Exploring the raster tools in QGIS and related software, I found raster buffer functions to surround existing rasters. The values of the raster buffer are restricted to be distances from the interior ...
1
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1answer
32 views

QGIS + GRASS: r.in.gdal “View output” produces “cellhd file (…) does not exist”

I'm working with a recently installed QGIS (2.10.1) + GRASS (6 v2.0) package, and have been working with some rasters and vectors in QGIS that I'd now like to play with using the GRASS tools. I've ...
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0answers
20 views

“Handle bad layers” with spline plugin

I´ve been trying to use the QGIS Spline plugin and so far it was going pretty good, though I had a few bumps I got through with help. But now, the layers I've worked with have dissappeared (or have ...
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1answer
73 views

Looking for a QGIS tutorial

I am looking for QGIS tutorials that cover the topics of making a user interface to update the attribute table or any related tutorial that might help. Does anyone know of one?
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22 views

Georeferencing google earth historical images

I have been trying to raster and georeferenced an historical set of images from Google Earth but I am experiencing issues after done the first one properly. I save 4 images from Google Earth of the ...
2
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0answers
32 views

How do I optimise performance on a local QGIS + PostGIS installation?

I'm learning how to manage a local PostGIS (ver 2.1) database, with spatial indexing enabled on the shapefiles that I've imported (using the PostGIS Shapefile Import/Export Manager). I have imported a ...
3
votes
1answer
59 views

How to toggle Map Tips with PyQGIS?

I want to display "map tips" in QGIS with python for my custom map canvas QgsMapCanvas(). How can I do this? I can switch manually with View/Map Tips but it won't work with my custom canvas in my ...
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2answers
35 views

Cannot Select 'Input line or polygon vector layer' when trying to simplify Shapefile

I'm trying to simplify a Shapefile by opening it in QGIS, Go to the Vector menu, selecting Geometry tools, and selecting Simplify Geometries... When I do this I get a modal window that I can fill out ...
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0answers
14 views

Problem installing Lizmap web client

I'm trying to install lizmap web client, following the steps present in here: http://www.3liz.com/blog/rldhont/index.php?post/2012/11/06/Test-LizMap-on-Windows-with-OSGEO4W. But unfourtunally i can't ...
2
votes
1answer
40 views

QGIS 2.8+: How can layer.selectedFeatures() return an empty list while layer.selectedFeatureCount() returns the correct number of selected features?

I noticed some changes since qgis 2.8 but can't find any information about it. Let's say I have a very simple point layer loaded in QGIS, from a spatialite table. From this layer I select some points ...
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31 views

How to solve UnicodeDecodeError in Python when executing Make Valid LWGEOM algorithm in QGIS?

I'm trying to fix some invalid geometries using the Make Valid LWGEOM algorithm in QGIS 2.8.3 processing toolbox but a Python error occurs: Errore durante l'esecuzione di codice Python: Traceback ...
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47 views

QGIS 2.10 crashes while working with Qgis2web plugin

Currently I am working on Qgis2Web for editing and generating web maps from my vector data. But after opening the plug in window. QGIS got crashed.
2
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1answer
42 views

Saving as TIFF in QGIS?

I made a color composite using Raster > Miscellaneous > Build Virtual Raster in QGIS. The output is a VRT file but I need TIFF. Then I went through Raster > Conversion > Translate. The output is TIFF ...
3
votes
1answer
70 views

qgis 2.10.1. mac - geotiff singleband pseudocolor [duplicate]

i've installed mac version from kyngchaos including all required packages ... ... and just noticed the following: while windows version behaves like expected when trying to render an ordinary tif via ...
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0answers
10 views

Visually clipping a search area (MCE) (QGIS)

I have some search areas to refine using a variety of vector inputs. I can clip these to get my end product but it is a messy process. Is it possible to use blending modes to visually "knock out" ...
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0answers
17 views

Pixel value of Geotiff image on Qgis different pixel value of input image

I have a binary image. I convert this image to GeoTiff image by python funntion: def exportGeotiff(filename, raster, row, col, xResolution, minLon, minLat, yResolution,geoReference): format = ...
1
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1answer
43 views

Programmatically import new composer from template to project using pyQgis

I am trying to find information about how to programmatically import new composer from template, but it is impossible. There is a lot of information how to print the composer to image, but not save ...
0
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1answer
15 views

Measuring different values in latlong Geotiff whether OTFR enabled or not

I'm using a GeoTiff file in QGis that has no projection per-se (it uses lat-long coordinates) and WGS84 datum. Further it has an x pixel size of 2.40475e-07 degrees and a y pixel size of ...
1
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1answer
65 views

Label only selected feature using QGIS?

Is it possible to make an expression that labels only the selected feature in QGIS? I tried it with this expression in the label tab: attribute( $currentfeature, 'LAENGE' ) But it labels all and not ...
1
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1answer
45 views

Style Sheets: Setting up a style sheet to change only styles, no other fields

I'm trying to create style sheets for my projects. I only wish to change the Style, without affecting labelling or the Fields. And I can't, for the life of me, get it to work. I'm using .qml files and ...
1
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0answers
29 views

Run a exe file from QGIS

I am trying to run an exe file from the python console in QGIS. my_aplication.exe is a script made in Python3.4 and 'compiled' to windows exe file import os ...
2
votes
1answer
33 views

Processing modeler Output Order

I have a model running on the processing framework it produces a serie of vector layers as output(alt-0, alt-1, alt-2, alt-3, and so on). I have prepared the model keeping the order of these ...
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0answers
7 views

Using the expression builder in the Atlas function in QGIS to group features?

I am trying to show only record in the atlas for the following attribute table... ogc_fid | id | phasename | exampleinfo ---------------------------------------------------------- 2 | ...
1
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1answer
21 views

QGIS--computing local standard deviation (from many bands) to each cell

I have HDF images with 365 bands each. Is there a way to compute local standard deviation across all of these bands with results appearing in each cell? I have tried Zonal Statistics (with polygons ...
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0answers
43 views

QGIS Server not working on CentOS 7

I installed QGIS Server via yumex on my CentOS 7.1 System and I have an Apache 2.4.6 Server running. My Problem is, I can't show a QGIS project in my Chrome browser. Of cause, I read many ...
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0answers
39 views

How to add images of buildings inside a map?

I'm going to do a trip and I want to have a custom map on my website. My idea is to have a map similar to this one for example. So I need to add images (svg or jpg) to the base map. I want a clean ...
5
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2answers
199 views

Password Protect QGIS project

On a shared computer, I have a QGIS project which links up to a PostGIS database that contains my data. If a user wants to access layers from the db, they have to enter the db credentials, so that's ...
1
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1answer
35 views

QGis aligning to grid north

My first post here. I'm designing a map at 500.000 for Italy and with EPSG 3035 or 3034 (Lambert Conical Conformal) I'm still deciding... anyway... In my map I've several points whose symbol is a sort ...
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0answers
8 views

Problem on displaying a layer in overlay on a s57 map

I am loading a s57 file, I select only some layer to be displayed. I am under QGIs 2.8 At this point it is ok, the coordinatereferencesystem is EPSG4326 WGS84 and at the bottom of the windows of qgis ...