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

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Adjusting extents so that same-CRS shapefiles overlap in QGIS?

I have two files with identical projections/CRS. Using both OTF on & off I cannot get them to overlap: one shapefile contains coastal polygons of Massachusetts, and the other shapefile contains ...
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15 views

polygonize giving duplicated polygons

I am trying to reproject some ascii files and convert them into shapefiles. I am new to python but looking at some code online and help files I was able to write the following code to run on Python ...
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1answer
18 views

GPS Live tracking with qgis android

I have a Tablet 10.1 notes on which I installed QGIS Android (v. 2.8) and a Garmin GPS 62 stc. So I tried to do the "live GPS tracking" by connecting through the USB cable the GPS to Tablet. Next, ...
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2answers
53 views

QGIS: circular buffers

I have a coastal line layer ( us-medium-shoreline from http://shoreline.noaa.gov/data/datasheets/medres.html ), which is loaded into a project with On-The-Fly reprojection ( WGS 84 / World Mercator ...
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1answer
27 views

QGIS: custom build, python error

I have built qgis source on windows 7. Libs have been downloaded from osgeow4 site. I even installed postgress as a standalone. I am getting this error when the app launches.. File ...
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1answer
30 views

Script not processing shapefiles from one folder to another

I am working on a script which takes shapefiles from one folder called "Original files", process them and then output the results into another folder named "Processed files. I asked a question on how ...
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0answers
20 views

Cost_Matrix Distance: Vehicle routing problem!

I'd like to calculate the "real distance" between one source and many targets, such as we do in the "vehicle routing problem", in order to get the matrix distance at the end. after using the osm2po, ...
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0answers
17 views

QGIS heatmap misplaced over dataset

First of all I'm a complete noob when it comes to QGIS so maybe thats the reason why I cannot find anything on this on google (or is this due to the 2.8.1 compatebility issue?). My issue is that when ...
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2answers
17 views

Batch export QGIS for various locations

I have the data for several cities in a layer. I'd like to run a batch export, that goes through a list and zooms in on one city (coordinate + zoomlevel), then the next, etc and exports each results ...
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2answers
16 views

MMQGIS:Create:Hub Distance: Output shapefile in wrong coordinate system

I have a QGIS-project that is completely in EPSG:31467 - DHDN / Gauss-Kruger zone 3. It consists of random points (camera traps) surrounded by a polygon (forest edge). I already converted the polygon ...
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16 views

Thin black line get grey when using composite pattern

I have noticed a couple times that if I set pen width of line smaller than 0.20 the line is no longer black. It is clear that the line does not just look gray because it is thin, the line is changing ...
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0answers
12 views

Assign Nodes ID to Polylines in QGIS

I want to consolidate data from various layers into a single layer so I can export it for use in an external software program. I am interested in how to selectively combine data from different ...
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1answer
41 views

differences in distance between shapely and geopy

I am getting totally different distances from shapely and geopy. On one hand - it makes total sense, shapely measures on a plane and geopy measures on a spheroid. But the differences are so dramatic, ...
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1answer
33 views

Attribute table not updating after QGIS field calculator used?

Using QGIS 2.8.1 i am trying to update an attribute table using the field calculator. its a vector layer of vegetation communities. i am trying to update the area fields in the table. The output ...
0
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1answer
22 views

QGIS - save vector poly layer into individual shp files?

Using QGIS v2.8.1, I have a directory of GeoTiff images. Using the raster ‘Tile Index’ plug-in (selecting “location” as the file index), I am able to create perfectly matched vector polys that I can ...
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1answer
24 views

Rename layers with script

Just discovered Qgis and really impressed! I've not formal GIS training so rely on Google to figure stuff out. I'm using the SHP files made available by the Canadian Government as part of their ...
5
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0answers
41 views

Getting weird lines in Print Composer QGIS

I am working with QGis 2.8 and want to use the print composer to create a jpg image. I used this PlugIn (https://github.com/jdugge/ClipToHemisphere) to create the globe. The graticules I created the ...
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0answers
31 views

Reproject before a Spatial Join

I have one polygon file containing all German municipalities as well as a point file. For each municipality, I would like to compute the average of a certain attribute of all points within the ...
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0answers
14 views

Difficulty creating a point layer using the line intersections function in QGIS

I am attempting to create a point layer from two line layers where the lines cross. I am using QGIS's built-in Line Intersection tool but the output point file created remains empty. I have checked ...
2
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1answer
40 views

Merging ShapeFiles with QGIS for UK counties

I want to draw a map for all the counties of UK including North Ireland. Since I can not find a source of counties including both North Ireland and Britain. I try to merge two shapefiles with QGISfrom ...
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1answer
47 views

Where is the python library of QGIS 2.8

where is the Python library for QGIS 2.8 on a mac (10.10)? I cannot find it... sys.path in the QGIS python console gave me some path, but where the interesting part is happening it replaces the ...
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0answers
26 views

Representing overlapping polylines in QGIS

I have several shapefiles representing bus lines with different colors for each segment, however, because the lines are exactly superposed, only the shapefile on top can be seen. Is there a way to ...
1
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1answer
30 views

Proof low deviations in DEM compared to point dataset

I am not sure how to achieve the following consistently: I have a regular distributed point dataset (surface elevations). From this I derived several DEM using QGIS IDW Interpolation method. Now I ...
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0answers
26 views

3d model to point cloud

Excepting FME, is there a way to convert 3d model to point cloud?
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0answers
19 views

Graduated Style on edges not appearing — QGIS

I have added a layer from a PostGIS database. The layer is representative of road segments in the greater Chicago area. I have added a second layer that does not have any geometry information but ...
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0answers
21 views

develop rooftop solar radiation potential from 3d buildings model (3dm)

Need to create solar cadastre without having LIDAR data. Have 3d buildings model in .3dm (150 000+ roof surfaces, 500 000+ facade surfaces unmapped, dtm 15x15m) with a lot of multipatch geometry ...
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25 views

Convert Zip+4 to Lat-Long

I have a need to convert about 1 million Zip+4 records to Latitude/Longitude for mapping but cannot find anything that is granular enough in output. Is there an easy way to convert this information?
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0answers
15 views

QGIS- Grouping Multiple Layers in to separate groups

I'm trying to group a large amount of layers together. They are a mix of Polygons and Points, I would like to create individual groups by the layer's name. Anyone have any ideas? I was looking to ...
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0answers
40 views

force QGIS-labels behind polygon areas

Is it possible to force labels behind a polygon dataset. In my case I want to put 50% transparent polygons onto areas, which are shown "inactive" on maps. Unfortunately, some feature labels are shown ...
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0answers
24 views

dxf-Export is not readable in BricsCad

With the QGIS 2.8 dxf-Export it is not possible to open these files in BricsCad (a CAD-Programm which is very similar to AutoCad). the dxf-Export from GIS 2.8 and import in BricsCad looks like!(not ...
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0answers
19 views

Using the phase 1 habitat styles?

I am utilising the phase 1 habitat styles and wanted to show 'mixed scattered trees' which is essentially a layer with two different types of green dot. I cannot figure out how to do this and also ...
1
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1answer
31 views

extracting the outline of raster imagery using GDAL

Salams I want some help regarding developing a method using GDAL to extract and represent the footprint of any raster file (or group of raster data) in a vector format... any ideas please ??
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1answer
21 views

Graphical modeler in QGIS. I can't find a model [duplicate]

I'm a doing a tutorial for QGIS and at one point I have to use 'Join attributes by location' model but I do not find it in the Graphical modeler. Does it have to be there? I have to download it from ...
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0answers
32 views

qgis-bin.exe - System Error

I'm running QGIS 2.8 Wien on Windows 8.1. I got this error: The program can't start because qgis_core.dll is missing from your computer. Try reinstalling the program to fix this problem. I ...
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2answers
44 views

QGIS distance matrix: wrong metric distance

I used the lineair distance matrix tool in QGIS 2.6 My coordination system is metric (national Dutch RD new) The results have the wrong decimals, as shown below. How can I fix this? (showing unique ...
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0answers
25 views

How to define layer in QGis like in AutoCad?

I have imported a dxf file into QGis. While the importing processes split my dxf file into three layers - Point, Linestring and Polygon, which are different from the layer in AutoCad. I found the ...
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0answers
21 views

QGIS Georefencer Failed to compute GCP transform

I am a new QGIS user. I am trying to georeference a scanned paper map. After uploading map to the georeferencing utility and assigning 12 ground control points to map and assigning a datum I get a ...
3
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2answers
55 views

Cost Distance Analyst In QGIS?

Are there any tools, plugins or methods in QGIS which allows for an analysis of the best path between two points using least cost path method? As shown below ArcGIS has several distance tools.
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0answers
18 views

convert .shp to .gpx with selected attributes [duplicate]

I am working with QGIS 2.6/2.8 (1.8 is installed too). Right now I am planning an inventory and want to convert a .shp file to a .gpx including the Column "fid" from the attribute table. Is there a ...
1
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2answers
28 views

how to color polygons with random color in QGIS

I have a map with a large number of polygons that I want to colour individually for display purposes. There is not particular pattern required, only to present them as individual catchments in a ...
1
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3answers
48 views

Visualizing multitemporal rasters scenes, side-by-side in QGIS?

I have to classify land cover/change every 2 months. Every 2 months about 5000 random selected points are classified, using L7/L8 images. For this, images from 5 different dates are show, ...
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0answers
28 views

Creating Mapbook with Hyperlink texts in PDF using QGIS Atlas?

I'm using QGIS 2.8.1 Atlas and creating a mapbook using a grid layer that has an attribute with a URL in it. I want to use the URL in the attribute to be a hyperlink in the PDF once its published. ...
1
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1answer
46 views

Why is QGIS map not sharp when Printing it?

This is my first project so please bear with me! I have downloaded the OS StreetView Map and loaded it in to QGIS, the map is 1:10000. I am running a 27" Mac, but when I view the map on screen at ...
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1answer
23 views

How do I remove the group name in the QGIS legend renderer

I am using QGIS 2.8.1 and the print composer to create a map for export. There is a lot of positive things to be said about the QGIS print composer. It gives the user good access to the rendering. I ...
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1answer
53 views

How to create several maps showing different layers but the same area?

I know about the print composer's atlas generation tool, which allows users to create multiple maps that show the same layers/features but different geographical areas. What I am looking for is a ...
1
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0answers
17 views

QGIS plugin saving layerstyle

I tried to use: Error = "" vLayer.saveStyleToDatabase ("styleName", "description", True, "", Error) in a python-plugin for QGIS 2.6 to save the data but no success. No error is written. First of ...
2
votes
1answer
22 views

View feature space for multi-band files

I am trying to plot a feature space (scatter plot) for some SPOT images in QGIS 2.8.1. I know a histogram is available in the file properties, but I want to plot eg. Band 1 vs Band 2 to see the ...
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10 views

Is it possible to host QGIS web application in Oracle weblogic server

I am new to QGIS and I want to know whether it possible to host QGIS through oracle web logic server instead of apache web server.
2
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0answers
18 views

Is it possible to edit qgis features in the web client by using Qgis server?

I am new to qgis and I am trying to build a application which runs on web by using qgis server Is it possible to edit features or adding feature on web by using Qgis server. Thanks in advance...
1
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1answer
26 views

Google+ photo in Qgis

I'm trying to use the kml file in qgis but only the html code is being stored in the attribute table. How to show the uploaded image(Google+) in qgis. It works fine in Google earth.