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

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1answer
49 views

Update postgres/postgis point data attribute from another enclosed polygon shapefile in QGIS

I have a placename point table in postgis with 'district' column. a districts polygon shapefile with district name in 'Name' column. See the image below. I would like to update the 'district' ...
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1answer
62 views

Importing otb into Python

I have Python 2.7 (installed together with ArcGIS 10.1). Via OSGeo4W a have installed qGIS and otb application.I was able to connect qGIS and otb and it's working fine. Through OSGeo installer I ...
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2answers
51 views

How to create a symbol with no fill color in qgis?

Where can I find a simple circle to draw it around a point feature. I can change symbol fill color as well as symbol border color. But I didn't find a way to set fill color to no color.
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1answer
44 views

How to create a x-y scatterplot from attributes in QGIS 2.0?

There are a few old packages that allow the creation of x-y scatter plots from attributes in vector data (Scattergram for 1.7) http://plugins.qgis.org/plugins/scattergrammidentify/ (SPQR for very ...
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2answers
47 views

Can't compile python plugin in QGIS (Windows)

I'm just installed QGIS 2.2 and created a new plugin from Plugin Builder. When I try to compile the plugin using: C:\Program Files\QGIS Valmiera\bin>pyuic4 -o C:\Program Files\QGIS Valmiera\bin\ ...
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1answer
29 views

How to prevent QGis (MMQGIS plugin) from interpreting numbers as strings [duplicate]

I'm using the MMQGis plugin to "Join Attributes From CSV" into a shape file and am having trouble getting QGis to interpret some numbers as numbers (rather than strings which is what its doing). This ...
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2answers
50 views

Is it possible to run a spatial query in QGIS 2.0 across multiple layers using a user-specified radius from a point?

I would like to be able to click on a point on a map to select all vector features (from multiple layers) within a specified radius of the point. Can anyone point me in the direction of how to do this ...
3
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3answers
148 views

Convert 800 .hdf4 files to Tiff using GRASS/QGIS/SAGA/GDAL/R

I've have MODIS ndvi data (MODIS_Grid_16 days NDVI) from the iberian peninsula, from February of 2000 to August of 2012 (really big data). How do I batch convert about 800 .hdf MODIS files to .tif ? ...
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0answers
22 views

Delayed moving average

I want to develop a plot of delayed moving average. The code for this in MATLAB is: nr_pontos = 36; coefs_filtro = ones(1, nr_pontos)/nr_pontos; data_dma = filter(coefs_filtro, 1, data); ...
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1answer
22 views

Given two Shapefiles, how to tell which one's CRS is set correctly?

I have a polygon shapefile projected in greekgrid (GGRS87_Greek_Grid) then I open an other shapefile which is in ETRS_1989_LAEA In ARCGIS 9.3 the two shapefiles are displayed correctly. But if I do ...
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1answer
37 views

Why are some layers saved with custom CRS while others use the appropriate EPSG code?

I have a number of .shp's that I have converted from EPSG 4148 to CPNO27. Some have come out perfectly and others revert to EPSG 1000007. I have checked and the only difference between the two is the ...
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1answer
40 views

How to avoid snapping errors in QGis?

I am using QGis version 2.2.0 and I set the snapping option to the vertex, with a tolerance of 1.5 meter. When I draw a new polygon next to an old one, it seems like the vertices are automatically ...
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1answer
89 views

What do “count”, “mean”, and “sum” in QgsZonalStatistics mean?

I am working with Qgis and making some analytics of lightdata. I've used these commands: rasterfile = qgis.utils.iface.mapCanvas().currentLayer().source() vectorlayer = ...
2
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1answer
43 views

how do i get a GDAL(using gdalwarp) clipped layer projected in pseudo mercator ESPG:3857 to not be shifted?

how do i get a GDAL rasterized layer projected in pseudo mercator ESPG:3857 to not be shifted ? i have a vector layer projected in ESPG:3857,after rasterizing using this command: gdal_rasterize ...
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0answers
29 views

Why my annotation markers are printed smaller?

I annotated one of my maps, for every annotation I set an svg marker whose dimension is either 6 or 8 mm. Everything looks fine in the main window. The problem arises when I try to print my map using ...
0
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1answer
43 views

Problems running model in QGIS

I am trying to make a batch model to convert band 2 and band 1 MODIS 8 day composites into NDVI. The input files are in tif format, but I want the output to be saved in Idrisi .rst format. I am ...
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0answers
72 views

Workflow with raster in Qgis 2.2

I'm trying to build a workflow with the Qgis 2.2 processing toolbox. I want to clip a raster layer with a vector layer using the GDAL tool "clip with a layer mask". But it doesn't work. The error ...
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3answers
63 views

How can I change more than one attibute at the same time?

I'm working in QGIS 2.0.1 Dufour. I started by cretaing a shape file form an AutoCad file. The problem is that in the AutoCad, my layers had symbols like: "~; ç; ^". As the QGIS does not support this ...
0
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1answer
50 views

Coordinate mix up

I am working on a basic map, pulling coordinates from google earth, converting them to decimal degrees in excel, and then importing them into qgis. I am using qgis 1.8. When converting from degrees, ...
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1answer
57 views

Qgis Spatial Join: problem with a column!

I run the function "Join attributes by location" in Qgis 2.2 between a point vector layer and a polygon vector layer. When I open the resulting table of contents of point layer there is a column of ...
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1answer
29 views

How to do a search in a line to a specific point

I'm using QGIS 2.0.1 Dufour. I'm working with a shape file made by a single line that represents a road with 30km. In that line I want to attach pdf files containing information about some points in ...
2
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1answer
52 views

Length of a line within a surface

I need to find out the lengt of each line within a surface. I have approx. 20'000 diferent lines and around 10'000 different surfaces. what kind of SQL-sentences do I need to use? I've tried things ...
2
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2answers
66 views

Suggest an algorithm to measure how a node is connected to road network

I try to measure how well a node is connected to the rest of the network. If a city has a distant suburb connected with one sole road, it's connectedness is, say 1. If it's connected by 2 roads, it's ...
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1answer
47 views

problem reading netcdf

I am using qgis 2.2 (I have also tried this in qgis 2.0 and arcgis 10 with the same result) (I have some basic understanding of netcdf, but I am probably missing a lot of details...) I have manged to ...
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0answers
77 views

Mac QGIS 2.2 error executing Python code

Newbie Using QGIS version 2.2 with Python 2.7.5 on OSx 10.9.2 Getting the following error. Any idea on how to resolve? I'm not sure if it has ramifications on the display of the Google data. An ...
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1answer
90 views

import qgis.core problem with QgsFeature and QgsGeometry

I've tried several previous answers to similar questions - no luck. I run Win7. I installed QGIS 2.2.0 using the OSGeo4W 32-bit installer. Problem 1) from qgis.core import * failed. Solution 1) ...
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0answers
34 views

Why does it take so long to run zonal statistics?

QGIS 2.0 Windows 7 I have pulled agricultural data from NASS CDL in tiff format. I want to track where a certain crop has grown over the years. My intention was to use a county shapefile overlaid ...
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2answers
45 views

How to use eVis to launch AutoCAD with a relative path?

I found this post, which leads me towards what I need: How to link to external files with relative path in QGIS actions? Now, I'm trying to use the eVis plugin to open .DWG and .DXF by launching ...
2
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1answer
26 views

Add objects from one layer to another at QGIS

How can I add some objects from one layer to another one. I mean, I have one layer with specific data(e.gg polyline) at the same time I have another layer with different objects .how can I copy/move ...
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1answer
20 views

work with emf files at QGIS?

how to convert EMF files to shapefile at QGIS? Actually I have EMF file that has been generated from Autocad-Civil3d. Thanks Hamid
1
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1answer
53 views

How can I copy columns from layer 1 to layer 2?

I have two layers, the first layer is pipe: that has some fields (column) title like : length, id, material. Also I have another layer that is empty (without any fields). How can I copy fields ...
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1answer
34 views

project points to a vector layer and get z elevation at QGIS

one point file and one dtm vector file. how can I project points to the vector file and get z elevation of them. Thanks Hamid
5
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0answers
107 views

Is there a good qml or sld file available for QGIS + Openstreetmap data?

I'm looking for a qml file (or equivalent e.g. sld) to allow me to use QGIS to take Openstreetmap data and produce paper maps. I'm re-asking this question (it was asked once or twice over a couple of ...
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0answers
18 views

Reconcile projections between .dxf and ESRI shapefile [duplicate]

My .dxf file that doesn't overlay or does not reproject with, like, the official shapefile for my state. The .dxf file came from a .dwg file from a local company that does pipe laying -- I just ...
1
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1answer
25 views

Are unicode symbols supported in QGIS labels?

I want to use unicode symbols in a QGIS label - is this supported? I.e. I have this expression for labelling a line: case when xat(-1) - xat(0) > 0 then 'GF ->' else '<- GF' end and ...
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1answer
67 views

Installing LASTools to QGIS on a Mac (or other LAS processing plugins)

I recently saw this link how to install LAStools toolbox to QGIS. The problem is that the instructions are only for Windows users. Now I wonder if it's possible to install LAStools on a Mac with QGIS ...
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1answer
26 views

Wich is the way to create serial field following alphabetical order with QGIS?

I have a field with names, a string field, and I want to create another one with serial content following the alphabetical order. I have this: -------- |Field1| -------- | B | -------- | C ...
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1answer
33 views

How to fix “update of view in private qgis.db failed”?

would anyone know why i keep getting this error message after installing Valmiera from Durfour? Thanks!
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0answers
35 views

Intergraph Geomedia WFS Read-Write Connection works?

I'm using Qgis server to share my project via WFS "Editar" layer must be editable. It works fine in Qgis, but In Geomedia (version 06.01.11.13) even selecting read-write connection I can't edit ...
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0answers
134 views

QGIS 2.2 problem, loading layer into road graph

I have the road graph plugin installed, but when I try to configure it with the Settings dialogue, no layer names appear in the Layers field. I have tried various shapefiles, but the Settings dialogue ...
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0answers
37 views

How to display a layer's label source column?

I have a CSV layer that displays points on the map. I use one of the columns as the Label. In Print Composer I would like to display the name of the column used to generate layer Labels. Is this ...
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0answers
21 views

Creating centreline from polygon [duplicate]

I´´m looking for a tool in Q-GIS that can create a centreline from polygon. Similary to this post: Finding centrelines from polygons? I´m not sure that the Geoprocessing Tool can deal with it. Thx
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0answers
29 views

QGIS convert attribute table to point shape

I have imported an attribute (whith no spatial information) table from MySQL. Fortuantly it has two colums with Longtitude and latitude taken from google maps. Is it posible to use those values to ...
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0answers
59 views

QGIS loads PostGIS layers but DBManager can't connect

DB Manager can't connect to PostgreSQL, but "Add PostGIS Layer" can. My eventual goal is to save created layers to PostGIS. I assume I can do this using the DBManager Tool. I can alternatively use ...
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0answers
16 views

Cell Statistics in QGIS

Cell Statistics in ArcGIS will calculate the mean (or statistic of choice) among multiple rasters on a cell-by-call basis. Can QGIS do this? If so, how?
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0answers
11 views

qgis-web-client Not rendering label fonts

My install of qgis-web-client is not rendering label fonts, each character appears as a black box / square. See screenshot: Tested in FF & Chrome, have tried changing from the MS system font to ...
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0answers
7 views

Matplotlib downloads to override folder

Just completed install of QGIS (2.0.1 Dufour) on a Macbook Pro running on Mavericks via Kyngchaos download page. However, when downloading Matplotlib for the install, while everything ended up the ...
1
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1answer
164 views

How to process MODIS ndvi data using QGIS/GRASS/R?

I have MODIS ndvi data (MODIS_Grid_16 days NDVI) from the iberian peninsula (3 tiles), from February of 2000 to August of 2012 (really big data). I want to know how to deal with this kind of files. My ...
0
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0answers
26 views

QGIS - Loading data by SQL-window in the DB-Manager is not working?

I have problems to add a subset from a PostGIS-table to QGIS by using 'load as new layer' in the SQL-window of the DB-Manager (QGIS-Version 2.2.0-Valmiera). I defined both the 'column with integer ...
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0answers
14 views

Getting EPSG:4326 WKT data for use in Drupal Geofield [duplicate]

As I understand it, EPSG:3857 is measured in "meters" and EPSG:4326 uses latitude and longitude. In Drupal, geofield seems to want to store "EPSG:4326" data using the WKT widget -- even though the ...