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

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121 views

How to join information from an excel table to a road feature in QGIS?

I'm working with GQIS 2.2.0 Valmiera. I've made a shapefile of a road that consists in a single line. Now I want to add information that I have in an excel table about several point in the road. How ...
2
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1answer
466 views

Why does QGIS 2.2 Atlas not work?

I have problem with atlas generation in QGIS 2.2. I'd like to export pdf map with 2 maps window and use coverage layer function. Atlas doesn't iterate across the features in coverage layer. First ...
-1
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1answer
58 views

Can QGIS alone can be used without installing grass?

can QGIS alone can be used without installing grass? i want to use functions of grass and i am not interested to create mapset and all. just with raster and vector files, i want to study temporal ...
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1answer
104 views

How to calculate the area of an ellipse on the earth's surface using Python?

I have a dataset consisting of GPS coordinates. I use a clustering algorithm to generate a two dimensional Gaussian for me. The Gaussian takes the shape of an ellipse if visualized on the map. ...
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1answer
185 views

QGis: scripting the map rendering (multiple similar maps from one shapefile)

I would like to ask for advice on creating a Python script that will provide the opportunity to render a plenty of similar maps (with the same extent, projection, layout, color scheme and composition, ...
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1answer
2k views

MSSQL Connection settings for QGIS

OK first lets get the blond elements out of the way- I'm not asking for how I connect to my actual database. What I'm asking for is an example or screen shot of the entries required when setting up a ...
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1answer
57 views

Producing gradients between shapefiles and using original boundarys as isoclines (lines)

to produce a bathmertical map of a river bed I draw shapefiles showing the different depths based on satellite images taken during different tidal levels (deepest, 2nd deepest, 3rd deepest, shore ...
2
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2answers
102 views

What's the use of the buffer function in field calculator?

I'm trying to find out how the buffer command in the filed calculator works. I tried to create a new field to my point shapefile (integer) with the following: buffer ($geometry, 100) but no ...
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1answer
102 views

QGIS map tip / label showing a table

I have a MSSQQL Spatiatal layer with Point data (borehole locations, pointID) and a joint table lithology (soil info per borehole, pointID, depth from, depth to, constituent) Is there a way to use ...
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1answer
51 views

QGIS 2.2 Atlas - Blank Export

I've got a map laid out how I want it in QGIS 2.2, using the "Atlas Generation" feature. When I preview the atlas, all 7 pages look proper and seem to work fine. However, I cannot export them to any ...
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0answers
25 views

Can a joined-layer have its attribute changed depending on what layers are selected/deselected?

Using QGIS, I have a polygon-grid layer which covers everything, Layer_All joined with 2 other grid layers: Layer_1 and Layer_2, both of which intersect at various points. I would like Layer_All to ...
4
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1answer
242 views

QGIS - move a point object to specific coordinate

Is there a way of select an object (point, polygon) and move it to a specific coordinate (manually inserted)? (with Numerical Digitize plugin can not make a move of the object but rather it creates ...
2
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0answers
109 views

Sorting points to flight path route

Original question: I would like to sort my points in QGIS. See image Restated question: The grid tool currently numbers by starting at R1C1 and going to R1Cx, then R2C1 to R2Cx. How do I number the ...
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2answers
59 views

Rasterization in different bands

I have a set of vector based shape files, representing different types of ground coverage in a city (for ex: roads, buildings, open field,...). For the algorithm that I want to run on it, I need just ...
1
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1answer
140 views

How to set the output extents of rasterization in QGIS

I am trying to rasterize a bunch of vector based shape files in QGIS. All these files are covering certain types of ground use in a city (houses, street, open field,...). I need these files to be ...
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1answer
329 views

How to remove black box around georeferenced grayscale image in QGIS?

i'am trying to georeference a grayscale image (*.tif) in QGIS 2.2.0 Valmeria. It is working but QGIS draws a black box around the georeferenced raster image. If i use the option set 0 transparent, not ...
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35 views

Credential Dialog, disabling default Realm information messages disclosing password

I'm using the QgsCredentialDialog for determining user access to the database. When a user is failing to log in correctly the log in credentials are shown in the dialog (Fig. 1). (success, uname, ...
3
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1answer
317 views

Expand raster extent and set expanded values using nearest neighbor sampling

I have run a hydrodynamic model which has given me a grid of surface elevations throughout a bay. I am trying to process the results in ArcMap (or QGIS if needed). My goal is to take the current grid ...
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1answer
61 views

Clipping several raster layers to the same exact size QGIS

I'm new to QGIS, sorry if this is a newbie question... I need to clip about 40 different raster layers from one vector layer (that has the boundaries of 4 neighboring countries) but I need them all to ...
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1answer
447 views

How do i create a flow line map for my data? [duplicate]

I am trying to illustrate a passenger travel flow map from a road terminal to several destinations on a road layer. I have QGis and ArcGIS, but I don't know much on how to start the work. I already ...
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0answers
284 views

Automating the production of GPS-compatible map tiles from georeferenced raster maps

I have a set of TIFF maps that I want to load onto Garmin GPS 62s units. The maximum size for each tile on the GPS is 3Mb and less than 1 million pixels. I manually produced one tile, following this ...
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1answer
78 views

How to convert this geometry location format to a qgis usable format?

I am a beginner with regard to dealing with gis information, so please bear with me. I would be obliged if someone could help. I have data on asssembly constituencies of Delhi, with these ...
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2answers
370 views

How to increase label size of OpenLayers plugin basemap layers?

For QGIS 2.2.0-Valmiera, how does one increase the label size of OpenStreetMap layer or any other basemap layer? Presently the labels are way too small to read. For example, I find that for the same ...
2
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1answer
111 views

Intersection of polygons QGIS 2.2

I have a polygon layer with many circle polygons in it, which are overlapping each other. I now would like to cut of the overlapping areas at their cutting edge: I use QGIS 2.2 and couldn't ...
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0answers
24 views

Why is node tool deleting unselected points in lines?

I am freehand editing lines to a shapefile on Mac QGIS 2.2.0, and have my snap settings at vertex and segment @ 20 pixels. The lines are roadways and I have merged them all into one feature and merged ...
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41 views

Error openlayers plugin in qgis [duplicate]

I did the following steps: I put the projection in 3857 and I enabled the project on the fly Open a vector shape layer in the projection 4326 I enabled the openlayers plugin Clicked enabled ...
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1answer
117 views

Question about BNG coordinate systems

I'm historically a user of MapInfo Professional but have recently started using FME and have been talked into now testing out a copy of QGIS. The main problem I've come across is that the coordinate ...
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1answer
65 views

why can't i export geometry data from a shapefile?

I saved the layer using "vector save as" box but even when adding GEOMETRY=AS_XY in the layer box, the csv only showed the id and no gemetry data.
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1answer
131 views

Help in importing excel data

I have downloaded the hourly solar radiation data from NREL which is in CSV format but the problem is that the file does not have an exclusive column called latitude and longitude. There are 100s of ...
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1answer
422 views

Replacement of QVariant and setAttributeMap in PyQGIS

I am updating a plugin for QGIS 1.8 to QGIS 2.x. I have the code below. The setAttributeMap does not exist anymore. I have replaced it with fet.setAttributes and it seems to work. When using ...
2
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1answer
224 views

Why do layers appear in the wrong order in QGIS 2.2?

I have a problem with in which order my vector and raster layers appear in QGIS. I have raster that I want to be the background of my other layers (vector). I place the vector layers on top in the ...
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2answers
479 views

Exporting PDF from QGIS with print composer without destroying fonts

So I'm making this nice map with a lot of labels which are going to end up in a book. Since the labels doesn't end up exactly where I want them I'd like to move them some in Illustrator after ...
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21 views

Link/unlink buttions in the Attribute Table's Form View

Toggling the edit button, in the Form View/Table View, buttons for adding/deleting a record is available. Two additional buttons are also available (Fig. 1). From the look of the icons they perform ...
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2answers
33 views

how to put a cropped selection of a map into the composer

I have a map canvas and I want to have a portion of that canvas printed. I adjust the canvas window in QGIS to show what I want to print and then add the map to the composer. The results are very ...
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2answers
915 views

How to work with Microstation DGN v8i files in QGIS?

I have a set of multiple files in DGN format (Microstation V8i). I would like to work with them in Qgis. Since QGIS only support pre-V8i dgn files, I cannot directly open the files. My first idea was ...
0
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1answer
48 views

Crossover Anaylsis

I am new to GIS. I have a text file with (lat,long) of flight lines. If I view the coordinates, they are points, but I am interested in drawing the path of those points, basically connecting them and ...
0
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1answer
258 views

How to organize a kml created from a shapefile in QGIS?

I have a shapefile that I would like to export into a kml to share it with my colleagues. This shapefile contains a few hundred polygons. I have QGis 2.2.0 on Windows 7. I would like to create a kml ...
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0answers
64 views

Entity handle from Visio

I have successfully imported the polygons from a Visio diagram via dxf into QGIS by using the "space" shape in Visio (a normal rectangular shape comes through as polylines, not as a polygon). Very ...
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2answers
115 views

QGIS 2. Bad layers won't resolve

This is getting worse... I created a project with about 6 vector layers (which I digitised) with some raster tiles. It is stored locally on my Windows 7 PC, running QGIS 2.0 The project was fine ...
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0answers
39 views

Using QGIS ComboBoxManager: adapting for QGIS plugin

I'm looking for more guidance using the QGIS ComboBoxManager module (http://3nids.github.io/qgiscombomanager/). After finally getting the imports correct, I'm trudging my way through learning how to ...
0
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1answer
154 views

How can I reproject a layer in pyqgis?

I have a problem. I'm currently trying to get the extent of a vector layer in latitude and longitude coordinates in python. The layer is currently in EPSG:3857, so .fullExtent() is not returning what ...
2
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1answer
215 views

PyScripter crashes at “import processing”

I set up PyScripter latest version, 2.7) to work with QGIS (2.2, OSGeo4W install) following http://chelahmy.blogspot.ca/2011/02/setting-up-pyscripter-for-quantum-gis.html. It generally works well. I'm ...
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0answers
100 views

Is the SAGA tool Basic terrain analysis included in Processing?

I can't find the saga tool Basic terrain analysis in the Sextante/processing toolbox. Is this not included or is there a chance to install it?
3
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2answers
79 views

How to change class break schemes in QGIS to eliminate overlap

When using Graduated Symbology in QGIS, by default the bounds seem to be overlapping. For example, class 1 shows 0-100.000; class 2 shows 100.000-200.000; class 3 shows 200.000-300.000 where it ...
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2answers
179 views

Properly clipping shapefiles in QGIS [closed]

I'm looking for help getting the correct shapefile. I'm working off of the files provided by the canadian government at ...
4
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1answer
99 views

How to calculate flight line intersections?

I am new to GIS, and I have flight lines and I am interested in determining the crossover or intersection of those lines. Can I use QGIS for that and what would be the procedures for doing it?
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0answers
14 views

map composer grid annotation in DMS format [duplicate]

I have digitized a map using CRS EPSG:4326 in QGIS. In Map Composer I set the grid. I can't get the annotation to display as DMS (degrees-minutes-seconds) rather than DD (decimal degrees) format. What ...
1
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1answer
376 views

QGIS 2.2 Attribute Editor Layout “Drag and Drop designer” Field does not exist in datasource

I am experimenting with a new feature available since version 2.2 "Relations" where Foreign Key relations from a database can be documented, so that the QGIS UI can (auto) generate its Attribute Edito ...
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2answers
64 views

How to add a pie chart based on all (or some) features in a layer?

I have a vector layer in a QGIS project which has about 60 items with various attributes, including a check for if an item is complete. I am trying to get a pie chart showing the percentage of the ...
2
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2answers
103 views

Why does QGIS 2.2.0 displaying triangles instead of rectangles? [duplicate]

When displaying the demographic datas from INSEE ...