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

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11 views

Read ellipsoid parameters

I would like to retrieve the semi-major axis of ellipsoid of a layer (any layer) using Python API. It seems that crs class can read only the ellipsoid acronym (?) Apparently, QgsDistanceArea class ...
1
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1answer
59 views

How to use gis data

I am extremely new to gis, i just received a shape file, and a zip file that includes the following files: filename.SHX filename.SHP filename.prj filename.dbf filename.cpg but not sure how i would ...
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2answers
20 views

What are QGIS Arcpy Equivalent Functions for MakeFeatureLayer and SelectLayerByLocation?

I have a script that I had created using ModelBuilder, but our field personnel use QGIS 2.0. Below is a snippet of the code. I am wanting to know if there is an equivalent using pyqgis so that I can ...
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0answers
9 views

QGIS Print Composer - SVG output displays objects outside the frame

On Windows 7. QGIS 2.6.0 from OSGEO network installer 64bit (and checked with latest dev version) I am preparing a print composer map displaying only vector data (shp). Data in the map canvas and the ...
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2answers
21 views

How to obtain data to create average precipitation in 2012?

I am currently doing a final project, which I have to create a map of 2012 average precipitation of lower 48 states by using natural neighbour interpolation. The problem is that how can I get the ...
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0answers
6 views

Export to Oracle using QGIS

I have loaded a shapefile into QGIS and I now want to export it into our Oracle Database and add SDO_GEOMETRY. Is it possible to do this directly in QGIS? If not, what opensource options do I have to ...
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1answer
6 views

Remove sections, defined by a line or polygon, from a raster in QGIS

(QGIS 2.6.0 on Windows.) I have created a raster layer of heights using the TIN interpolate function. I also have another raster layer with more accurate information on the height of particular areas ...
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30 views

OpenLayers and GeoJSON

there! Recently I started learning Openlayers 2x and I've been struggling for a while now with a GeoJSON and it's projections. So, here is the deal; I successfully added wms layers from ( ...
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0answers
9 views

QGIS formatting problem using POSTGIS (datetime)

I want to use the time manager plugin using data from a PostreSQL-db. In there the time stamp is set up as follows: "[...]to_timestamp('2014-10-21 00:00:00', 'YYYY-MM-DD HH24:MI:SS')::timestamp ...
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3answers
21 views

How can I display a symbol to a specific attibute in QGIS

I have a point shapefile, where I categorized my waypoints with attributes (schools, toilets, etc) and I would like to display certain attributes with specific symbols. How can this be done? Thank ...
1
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1answer
11 views

QGIS geojson vector layer

When I add vector layer to QGIS using geojson protocol, data form server are being displayed. Problem is that every change of map extent (pan, zoomIn, ZomOut) is causing request for same data again. ...
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1answer
27 views

Crop one shape file using another shape file in QGIS

In QGIS 2.0.1, is there a way to automatically slice up one shape file and export it as multiple files using polygons defined in another shape file? I have a detailed shape file that categorizes the ...
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2answers
27 views

Exporting GIS Images with Transparency

I'm trying to export some images of Gulf of Mexico infrastructure that will later be used for non-GIS purposes as overlays onto sea current/weather maps (likely in photoshop). I have no clue how to ...
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1answer
17 views

Copying the numeric portion of an address to a new field

I'm attempting to copy just the numeric portion of a street address into a new table using the Field Calculator in QGIS. The expression I'm trying to use is: left( "SITE_ADDR", strpos( "SITE_ADDR", ...
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0answers
21 views

QGIS crash when I try print geometry

I do (It`s work): from osgeo import ogr inputds = ogr.Open(r'c:\temp.shp') inputlyr = inputds .GetLayer() for i,feature in enumerate(inputlyr): print i, feature.GetGeometryRef() Output: 0 ...
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0answers
11 views

How to get linestringe from kml into shp or postgis [duplicate]

Im looking into extracting linestrings from a kml file into a shp file or postgis db. Each linestring would be a feature/row. How would I go about it usinge ogr2ogr or python? I'd like to get ...
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0answers
20 views

How to save geopackage gpkg file with QGIS

I read about the new geopackage file which shall have the potential to be the shapefile of the future. But i can't find a way to save a file in QGIS as gpkg. In ArcGIS it might be possible. I would ...
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0answers
26 views

How to edit metadata in QGIS

What possibilities exist to edit metadata in QGIS? I did only find the plugin Metatools which is experimental and did not work for me. So are there other possibilities than Metatools? -In Metatools I ...
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3answers
151 views

Create fishnet grid in QGIS

Anybody have recommendations for creating a fishnet shapefile using QGIS? The equivalent task of "Create Fishnet" in ArcGIS.
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0answers
29 views

Creating an irregular points grid — one with regular along-slope distances

I am currently using QGIS to try and prepare a series of equally spaced -- along the terrain slopes -- sampling points within various NVC (National Vegetation Classification) sites in the UK. I am ...
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0answers
12 views

Python problem during CADInput installation

I was trying to install CADInput (version 0.60) on 2.4 Chugiak and 2.6 Brighton as well. In both cases I got an eror message during installation. For me the following extract of that message might ...
2
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1answer
27 views

QGIS calculates main soil type of polygons from another polygon layer

I've been working with qgis for a while but somehow I never fiured this out, so I thought it's time to ask. I have 2 shapefiles. a polygon layer from nearby fields (SHAPE1 (the red outlines)) a ...
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18 views

Delete shapefile object

I have a shapefile layer which comprises of a series of lines which represent archaeological features. I cannot delete individual lines as the delete button is greyed out. Is there a way for me to ...
2
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1answer
26 views

QGIS Plugin to add point to map without creating a file

I am looking for a QGIS Plugin to add a point to the map by entering it's coordinates. The point should only be there temporarily (as long as the QGIs project is open) and not be saved in a file.
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24 views

QGIS 2.4.0 Setting raster layer to singlebandpseudocolor using minimum and maximum raster values

I am using QGIS Chugiak 2.4.0, and I have some code in which I want to: Add raster layer to map canvas Look for the minimum and maximum raster value Apply singleband pseudocolor render type for the ...
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55 views

Why do each of my buffer-polygons have different areas

I`m using Qgis 2.2 and 2.4 and loaded a wms-map using the coordinate system ERTS89 UTM 32N. I set 8 points (all in on shp-fileand in UTM 32N) on various locations on the map. After that i created a ...
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0answers
10 views

Using attributes in the label of print composer

In QGIS 2.6 I have a problem similar to this post How to set field values as labels in QGIS2 Print Composer in that I want a label box in print composer to display the attributes of the first feature ...
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1answer
27 views

What is the expression for getting a subset of characters in QGIS Field Calculator?

I have a column of 10 character names e.g. L3NAM1988K. How can I delete the first 5 characters and the last 1 character using an expression in the QGis Field Calculator?
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12 views

QGIS 2.4 under Debian behind a proxy Plugin Repository

i'm having a problem to connect the official QGIS Plugin Repository in QGIS 2.4. I'm working in a company which uses a proxy to control web access. The plugin repository is available over the proxy ...
2
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1answer
38 views

What is the fastest way to digitize features on a map?

I'm currently using QGIS basically to trace a bunch of polygons to show individual ponds from google maps. Some of the geometries can be pretty oddly shaped and using the nodal digitizing tool gets ...
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0answers
16 views

How to save SQL-like WHERE as .qqf in QGIS 2.6?

I used to use QGIS 1.7.4. And there was "advanced search". I can save SQL where clause as .qqf. But I installed QGIS 2.6 and I cannot find this kind of things. Could you please teach me how to save ...
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19 views

Print Composer QGIS 2.6, how to expot image?

When i finish map in print composer and click on Export to an image format and after i go to folder where i saved it there is no image. If do same with Export as PDF i get PDF file but cant open it ...
2
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0answers
24 views

Percentage cover using QGIS?

I need to calculate the percentage of coral cover (polygon layer) in a 1 km radius around each record of fish (point layer). There’re about 4000 points (blue squares in the image). I am new to QGIS so ...
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28 views

raster and vector misalignment

my vector and raster datasets align perfectly fine in Arcmap but not in QGIS, any suggestion on solving this dilemma is very much appreciated.
0
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1answer
28 views

Remove cell boundaries of raster pixels converted to vector format

I have a solar radiation shapefile with 10 km x 10 km cells. When I put it on QGIS, many pixels with boundaries take place. Please see the following image: How can I remove them in Qgis?
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29 views

QGIS - Tabular output for labeling

I'm new to QGIS and am trying to figure out how to output labels under a tabular symbology (I would have liked to post a file showing what I want but can't find a way to submit a file) : So my ...
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0answers
20 views

QGIS font symbol problem

Where qgis store the fonts. I try to find the directory but i cant. I transfer my symbol to other pc and i realized that have missing fonts and this is the reason that my symbols is wrong
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43 views
+50

merging raster aerials in QGIS issue

I follow the instructions here very closely and yet every time QGIS gets caught in a loop. It takes a few small rasters totally less than 100mb and creates HUGE gb files and will not stop until ...
2
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2answers
68 views

Calling QGIS from MacOS python

I would like to import qgis.core and utils from my own copy of python. I do have PYQT4 installed there. I'd be happy to add to my PYTHONPATH or sys.path.append in my code, where do the qgis modules ...
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1answer
37 views

Missing Plugins in QGIS 2.6

Do I need to re-install plugins after upgrading to 2.6? Not all the plugins I had on QGIS 2.4 appear on 2.6.
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0answers
22 views

Create polygon with predefined size

I need to create a polygon (square) with a predefined size to place it anywhere in a map. The size is given in centimeter (size in cm * scale = size in real). Is that possible with postgis/qgis?
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0answers
26 views

QGIS 2.6. How to move labels with “easy label engine” tool

In fact I'm looking for an similar tool like "converting label to annotation" as you can find it in ArcGIS. The "easy custom labeling" Tool in QGIS seems to come close to the ArcGIS solution. However, ...
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1answer
37 views

Can I include polygons that lie across boundaries when using the clip tool?

I am trying to create a map consisting of two vector layers showing a country divided into districts and contaminated areas within the country. However, since I'm only interested in the ...
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0answers
22 views

Font styles problem

i have problems with Font Styles in qgis. I have created fonts symbols in my system but when i open the same qml in an other pc the fonts is rong. I try to export my symbols in xml but nothing. please ...
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0answers
11 views

Getting error when consuming WMS (created from ArcGIS Server) from QGIS 2.4

I have created WMS and WFS using ArcGIS Server. I further deploy the authentication towards both services using the users & rolese set by ArcGIS server built in store. For example, user with ...
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0answers
14 views

QGIS - Select intersecting features within Value Relation Widget

Does anyone know if it is possible to filter records in the Value Relation Widget to include only those that intersect the current feature? We are trying to set up a layer for user input where we ...
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0answers
35 views

How to apply colour ramp to user-defined range of values for contour lines?

I have contoured elevation data, across a number of shapefiles, at 10m intervals. Each tile has a different range of values (min - max). Under Style > Categorized, I can only apply the colour ramp to ...
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0answers
34 views

How to manually add texts on the map in QGIS?

Is there another way to put river, towns etc names beside labeling in QGIS? Can you manually type text determine size and place it where and as you wish on the map?
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0answers
15 views

QGIS Extract elevation data only for one country [duplicate]

Hye, Here a map built with (1) a shape file for country contour, and (2) raster from .hgt files with altitudinal representation. How can I only select the area corresponding to the country ? I found ...
1
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1answer
67 views

From CSV file (latitude and longitude fields) to point .shp

How i create a new point shapefile from CSV table? If i have a CSV file with a latitude and longitude fields, is there a method for to have in output a puntal shapefile?