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

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4 views

c++ qgisvector layer is not Valid

#include <QtCore> #include <QApplication> #include <QWidget> #include <qgsapplication.h> #include <QMainWindow> #include <qgsmapcanvas.h> #include ...
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0answers
10 views

Finding and using data on population density files

I'm new to GIS and been trying to figure so many things out on my own by using QGIS. Now on to my question. I'm attempting to replicate this map for the state of Nevada: ...
1
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0answers
13 views

how to automatically update column based on the second layer, trigger, postgreSQL

I am newbie in postgreSQL. I have 2 tables, observation and landcover, i want to create a trigger which would allowed to update the column observation.land based on the spatial information according ...
1
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1answer
18 views

Route and distance measuring

I'm looking for a plugin that can make a route from given GPS points and then calculate the distance of this route. I'm going to create GPS points and import it to Qgis as a GPX file. I know I can ...
2
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0answers
17 views

Help getting a Mathematical Representation within a Layer's Attribute Table

I'v been playing around with Vector Coding and was wondering if there was any Plugins out there that might let me represent Vectors within a layer as it's Mathematic attributes in the Layer's ...
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0answers
27 views

Split polygon based on line qgis [on hold]

I would like to split polygons based on intersection of a polyline. How can i do this with python in QGIS? Thanks
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0answers
35 views

Create floorplan KML file in QGIS?

I import a building floor plan from DXF format to QGIS. When I export it to KML format and then import it in Google Earth, how can I put the floor plan to my desire building location? MY CRS is WSG84 ...
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0answers
23 views

What am I doing wrong with QGIS v.clean?

I thought I understood how the GRASS v.clean tool worked in QGIS (in 2.6.1 Brighton) but I keep getting unexpected results and errors with a polygon ShapeFile. I've run the QGIS TopologyChecker with ...
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2answers
19 views

QComboBox nested within a Qmenu?

Is it possible to nest a QComboBox inside of a Qmenu within QGIS? Below is my current code and an associated screenshot with the unexpected results. (orange = current incorrect placement, green = ...
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0answers
29 views

Assessing Flood Hazard Risk Zones using DEM

My Question: What is the best effective way to quickly estimate flood hazard risk areas using DEM data? Ideally I am looking for guidance to move forward and perform this process over large areas ...
1
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0answers
16 views

Syntax to use when entering geographic data into geography columns via SQLSERVER Management Studio

I am starting to learn about spatially aware databases. I have QGIS 2.61 and SQLserver express 2012. I can set up a table using the SQL Server Management studio GUI and insert a geography column. ...
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0answers
40 views

QGIS- Unable to load GdalTools plugin

When I start QGIS, it display error message: Unable to load GdalTools plugin. The required "osgeo [python-gdal]" module is missing. Install it and try again. Couldn't load plugin 'processing' from ...
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1answer
16 views

QGIS plugin select and edit features performance issues

I wrote a plugin for selecting and instant updating the value of the selected feature in the attribute table. I tested with a big shapefile and to select and edit 5 features takes ~5 seconds. Which ...
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0answers
16 views

qgis & wacom cintiq stream digitizing

How to digitize in stream mode in Qgis, using a wacom cintiq tablet? freehand it's no use. i need something like MNDR stream digitizing extension for arcview 3.x, which allows continuous tracing, ...
1
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1answer
22 views

Adding shapefile layers in QGIS causes previous layers to disappear

This is my first time having such trouble, but I'm only a casual user. I have a base raster layer of the school I work for and I've been adding vector shapefiles on top of that in separate ...
1
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1answer
41 views

How to split a text attribute by characters in QGIS 2.6.0

Is it possible to make a new column, for example named "Test" and store the first part of the column "Name" split by -? See below how it should look like:
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2answers
47 views

File or personal database in qgis?

is there any database ? I use ArcMap with file geodatabase. But now, i have make project in qgis and i dont know, how to create database.
2
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1answer
30 views

QGIS has an automatic way of finding the LS factor?

I wonder if is possible to calculate LS (soil erosion) factor automatically in QGIS? Or at least a way to calculate the length slope?
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2answers
81 views

QGIS OpenLayers Google Maps not zooming

Google Satellite will not zoom. Although the scale changes as I zoom, as the map is re-rendered, it zooms out to its maximum extent every time. This first happened in the latter part of November ...
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0answers
16 views

Projection problems when importing .kml from Google Earth to QGIS

I want to open several points that I exported from Google Earth as a .kml in QGIS for further use. I can import the data and the points are displayed but something must be wrong with the projection as ...
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1answer
44 views

What is a memory vector layer in QGIS?

What is a memory vector layer and how does it relate to the vector layer? Background info: I have a volunteer working with my organization, because of financial reasons we have him using QGIS. He ...
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0answers
12 views

plugin compile with make would not compile module [on hold]

Ubuntu 14.04 QGIS 2.6 PyQt4 I'm following one of many tutorials on 'plugin builder', here is the latest one I'm trying with: http://www.digital-geography.com/build-qgis-plugin/ It all seems very ...
1
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1answer
19 views

creating a new vector layer from a part of the current one [duplicate]

I am using qgis 2.6 for the first time. As I was using 2.2 previously, it was easy for me to create a new vector layer from a part of the current layer with the help of option "save selection as a new ...
3
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0answers
28 views

Merge Raster Layer Specific Order in Graphic Modeler

I'm using the Graphic Modeler/Processing Modeler to automate a process. The last step in this process is Merging three different Raster Layers. I'm using the "Merge Raster Layers" from Saga 2.0.8. ...
2
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1answer
19 views

Plugin to develop composer attribute tables

I have no experience of plugin development, but I'm wondering if it would be possible to write a plugin that solved the issue of multi-line tables in print composer http://hub.qgis.org/issues/10273 I ...
1
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1answer
21 views

78% cease calculation and “no message” from QGIS

I'm a total noob. I'm trying to generate an outline of a bunch of elevation lines which i can use to cut into some other elevation lines. I understand that I can buffer and dissolve to get the result ...
2
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1answer
61 views

PostGIS cannot create new feature

I have a PostGIS database - using the main user I can create/update new features no worries. I have created a series of new logins and given them all full access to select/insert/update etc all the ...
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0answers
23 views

Print large land area using QGIS 2.6.1 Brighton

I have a rectangular area of approximately 10km x 20km and I wish to print this to A0. (I will select a scaled portion of this area - most of it - that matches the A0 page size) I have a few layers ...
3
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2answers
43 views

Azimuthal orthographic projection QGIS2.6

I'm trying to create a globe view in QGIS2.6 with an Azimuthal Orthographic projection using NaturalEarth's 110m countries dataset. I'm following Hamish Campbell's blog post instructions that have ...
2
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0answers
20 views

Shifted tiles in QGIS with mbtiles

I'm confused because of the representation of mbtiles files in QGIS. It seems that the whole grid is shifted by about 3 m to the south. So far I can observe this behavior only in the context of ...
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0answers
26 views

How to create a mosaic in QGIS with cutline and feathering for Landsat-8 imagery

1 - I have two scenes Landsat-8 RGB 6/5/4 and I need to mosaic them: 2- This is my cutline in polygon format that will smooth the overlapping area: 3 - So, I need to create a mosaic with ...
2
votes
1answer
52 views

How to align QGIS legend items to the right?

Is there a way to align QGIS map composer legend items to the right, for right-to-left languages? There is only a title alignment option. Furthermore, I found this ticket from 4 years ago regarding ...
2
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1answer
29 views

How to compute areas where the value in one layer is smaller than in another layer?

I have two vector layers, one contains actual values (in this case % cover of native species), the other contains target vales of the same attribute. the polygons are not always of the same geometry. ...
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0answers
27 views

Join/convert points to polygons

(I am using QGIS 2.6 Brighton) I have 2 shps, one points and another one polygons. I need to make them one. Is there a way to join them or convert the points to polygons? Vonoroi doesnt work for me ...
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0answers
56 views

How to zoom past 1:1433 with Openlayers plugin in QGIS 2.6?

I am editing the polygon shape file in QGIS 2.6 with the projection of "USA_Contiguous_Equidistant_Conic" but i can't able to zoom in the open layers like Google maps and bing maps morethan 1:1433 ...
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0answers
25 views

Field Calculator stopped working

The field calculator seems to have stopped working for one of my attribute tables (it works fine on others). No matter what I get it to express (I've tried simply 2*2, just as a test) it just produces ...
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0answers
23 views

How to Create a Minimum Bounding Polygon in QGIS [duplicate]

Does anybody know how to create a "minimum bounding polygon" from a set of polygons in QGIS or elsewhere? For example, in the figure below I can create a Convex Hull per the purple outline, but I'm ...
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0answers
13 views

Print Composer: Finder window disappearing when pressing save button?

I recently updated to 2.6.1 (using mac OS 10.10.1). When I'm in print composer, and I try to save my map (or open a new file, or do anything that brings up a finder window), the window disappears ...
3
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0answers
56 views

How to simplify polygon shapefile and maintain topology? [duplicate]

I'm looking for a straightforward answer that actually works...not a 'duplicate question' flag. None of the other solutions posted in similar threads actually work...they all have dead-end answers ...
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0answers
27 views

Snapping while measure in QGIS?

I've been reading here and there that snapping while measuring should work in QGIS, but i can not make it work for the life of me. https://hub.qgis.org/issues/8537 All the snapping options are set ...
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0answers
31 views

Mapfile generation from QGIS project

I am looking for a way to transform a QGIS project (.qgs) to a MapServer Mapfile (.map). I am using Quantum GIS 2.6 and MapServer 6. The layers are postgis tables. I would need something like this ...
1
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0answers
17 views

Is it possible to only have one Feature Attribute Window open in QGIS?

I suppose it's by design that when you click through(identify) your features, for every feature it opens the attribute window (which is good, i have enabled the checkbox to automatically open the ...
1
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1answer
35 views

How to customize the QGIS default GUI using Python?

Is it possible to hide/remove/customize the default ui of qgis using python plugin. I want to add my own menus and toolbars and remove default. If it's possible, which reference should I use?
2
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0answers
14 views

Aggregate nearby points to develop equally sized regions in QGIS

I have a list of 4,500 points (lat, long, unique id, attribute). I also have a service territory which all of the points fall into. I would like to break the service territory (polygon) into 6 ...
2
votes
1answer
26 views

Information On Supported Device Qgis Galaxy Tab 4 10.1 4G LTE

I need a tablet for outdoor work and i would know if this device "Samsung Galaxy Tab 4 10.1 4G LTE" works fine with qGis mobile application.
1
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1answer
50 views

Split lines by polygons in QGIS 2.4

I have a river network (lines) and a shp with states (polygon). I would like to split the lines at the state boundaries --> split lines by polygon boundaries. Is there a geoprocessing tool to do ...
2
votes
1answer
50 views

geting geograpic locations from an address list

I have a table with 150 addresses. I would like to automaticly generate a point shapefile/PostGIS layer from all of them. Is that possible in any way or do I have to search for every single address to ...
0
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1answer
30 views

Print Composer: Export PDF as raster with vector labels

Is it possible (or will it be possible in the future) to export a PDF/SVG as raster with vector labels? I'm using effects (blending, transparency etc.) which I can not export as vector. So I have to ...
2
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0answers
32 views

Frontal Detection of sst & Chlorophyll image

I am working on sea surface temperature satellite images and looking for delineating gradients in open source on the basis of temperature. Is there any tool like Cayula and Cornillon front detection ...
1
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1answer
24 views

SQL-Like Inner Join on IDs in Two Layers in QGIS

Using QGIS v2.6.0-Brighton. This question is not about editing layers geographically in anyway. It is merely trying to find data from two layers as you would in an SQL Query and append an extra ID to ...