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1answer
27 views

Gall-Peters or other cylindric equal-area projections in QGIS?

Is it possible to use Gall-Peters or other cylindric equal-area projections like Hobo–Dyer in QGIS?
2
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3answers
53 views

qgis set layer “unselectable” - Avoid identifying features in multiple layers

In MapInfo, it is possible to turn 'selectability' off on layers, which means that when you click on the map objects on that layer aren't selected. It's very useful. Is there a way to accomplish this ...
1
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0answers
26 views

Autofill fields of pyQgis script

I have three fields of output vector layer in Qgis script: ##output_vector_first=output vector ##output_vector_second=output vector ##output_vector_third=output vector When user fill first field I ...
2
votes
1answer
44 views

Distance to coast in specific direction

I have a point layer and want to know the distance to the coastline (line or polygon layer) from each point in a series of directions (0, 10, 20, 30 degrees, etc). I have found this python script (...
3
votes
1answer
30 views

AddRaster using pyqgis

I am able to attach a raster by using python console using the command shown below. qgis.utils.iface.addRasterLayer('D:/Work/dt0017810q.tif') But, when the same image/raster path is read from a ...
7
votes
1answer
216 views

How to remove a QGIS project from the “Recent Projects” list?

I have a project in the QGIS Recent Projects list that doesn't exist anymore, but it keeps being listed (greyed out and without thumbnail image). Is there any way to remove it from the list? Perhaps ...
2
votes
1answer
68 views

QGIS: calculate distance between points

I'm using QGIS 2.8. I need to calculate the distance between points depending on points ID (not nearest point). I have a CSV table including points ID and coordinates. Each point is referenced on 2 ...
3
votes
1answer
52 views

Attaching Excel sheet with different language font(hindi) to shapefile

When I try to join a excel sheet with Hindi font to a shp file, I get '?????' as a result in those cells which has Hindi font. (Before/Aft images attached) I tried changing the locale language to ...
1
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1answer
34 views

QGIS _Distance from point to polygon- doubt

I want to calculate the distance between a shp of points and a shp with a few polygons. I am using MMQGIS (Hub distances), a UTM coordinate system, and everything works fine, but I think it is giving ...
3
votes
1answer
46 views

QGIS GDAL toolbox - can't edit console call

I've noticed a few answers for QGIS/GDAL questions that show how one can edit the console call e.g. http://gis.stackexchange.com/a/159577/76240 Im using QGIS Essen 2.14.3 via OSGeo4W on Windows 7, ...
1
vote
1answer
35 views

Assign order number in which line intersect polygons

Is there any tool (plugin) for QGIS to assign order (sequence) number of line intersecting through polygons? At this moment I use a bit cumbersome solution which works but... I use Qchainage ...
2
votes
0answers
41 views

QGIS Python Script - Python.exe Stopped Working

I purchased this book called Building Mapping Applications with QGIS and I am trying to work through one of the exercises. There is one script that I try to run that crashes python, generating the ...
1
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0answers
28 views

many-to-many relation in Qgis usin MSSQL

Does anyone know how to create many-to-many relation using QGIS and MS SQL? I have many pipes that are geometry and I need to place in them many cables (not geometry, table with attribute).
2
votes
1answer
26 views

After converting .shp to .gpx, there seems to be no content in the .gpx

I tried to convert .shp files into .gpx using QGIS. Originally, the .shp were in the Swiss Coordinates (CH190) but I've changed them into WGS. I can load the .gpx into QGIS which works really fine. ...
2
votes
1answer
54 views

How can I trigger a QGIS plugin Event from map refresh?

I have a combobox in my plugin (python Qt dockable widget) that needs to contain the currently open rasters. How do I trigger an update of the plugin when something new gets added to the map?
0
votes
0answers
17 views

conditional rule on trigger to historical table [closed]

I have a history table that tracks modifications to attributes/geometry for each layer I need to set a condition that if the attribute is 'Y' for the column "export" in the "span1" layer, the trigger ...
2
votes
1answer
66 views

How to create a 3D shapefile in QGIS?

How can I create a 3D shapefile containing line features or point features? I have to extract the elevations from a DEM and then export a shapefile containing 3D features. I'm currently working with ...
2
votes
1answer
29 views

Add layers to Spatialite Database using PyQGIS

I would like to add layers into a spatialite database. I have used the QgsVectorFileWriter method: parcDisSHP='/xxx/xxx/xxx/xxx/FILE.shp' parcelasDis = QgsVectorLayer(parcDisSHP, 'Parcelas_Unicas', "...
2
votes
1answer
58 views

Computing distance between two points following network and doing it for 100.000 points?

My starting data : a collection of points which are buildings a collection of points which are electrical transformation plant a network of vectors which is the public electric network from an ...
1
vote
1answer
55 views

In QGIS is there a way to make one polygon out of several

I'm trying to use QGIS to get a more simplified vector country data. For example Canada has several bits to the north all as separate polygons where as I'd be happy to just take a rough outline of the ...
1
vote
1answer
31 views

Why does Print composer draw wrong coordinates?

QGIS Version: 2.14.3 EPSG: 32630 (WGS 84 UTM Zone 30N) I´m trying to draw a grid with EPSG: 32630. Layers are in the same CRS. As you see, coordinates are completely off. It does not matter if I use ...
4
votes
1answer
65 views

How to selectively generate averaged raster layer from 5-year data raster layers in QGIS?

I would like to merge 5 years of world ocean surface productivity data raster into 1 averaged raster in QGIS. However, not every pixel has data in every year. To generate the raster layer with the ...
1
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0answers
27 views

Merging DEM file generted many negative value in QGIS

With four DEM files downloaded by Python Elevation package, I merged them in QGIS 2.8.3. I use raster-> Miscellanaous -> Input direction, no more attribute was added. The four dem data has ...
2
votes
3answers
226 views

How to use field calculator to change values from a,b,c etc. to 1,2,3 etc.?

I have a vector shp with a column with string values. How can I convert this to a column of integer values in another column but keep the categorization: e.g. from: col1,newcol2 A, A, B, A, C, to: ...
1
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0answers
47 views

How to calculate raster area or number of cells for multiple classes in a raster?

I have a raster with many classes and I want to know the area or the number of cells for each class. I found quite a few posts on this topic (see links below). None of the suggestions matched my ...
1
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0answers
20 views

Run and install packages from local folder QGIS [duplicate]

I use QGIS in my work and sometimes need install python libraries for plugins to work but I don't have write access to C:/ where QGIS and python is installed (OSGeo4W). Is there a way I can install ...
2
votes
0answers
28 views

Using “Difference” in Geoprocessing Tools results in Minidump

I want to use this tool on 2 vector layers but as soon as I start the process I get a minidump and I have to close QGIS. Does the .dmp file help you in solving this? Or can I open it and look for ...
2
votes
1answer
46 views

georeferencing swisstopo print

when i tried to georeference a printout from map.geo.admin.ch, either the result got turned some degrees, or the height got compressed or both. using the helmert transformation gave me the best ...
1
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0answers
35 views

Cutting many lines (as rivers) that are outside of a polygon in QGIS

I would like to extract only the vector lines, that represents rivers in my case, inside a polygon. I tried to use the intersection and clipping from QGIS, but couldn't do it. Any help?
2
votes
2answers
63 views

Mistake in Calculating Area or a Bug in QGIS? [duplicate]

I am trying to calculate the area of a polygon following the step by step mentioned in all the questions related to this issues in this website. Nonetheless, the result of the area calculation is ...
3
votes
1answer
63 views

Hillshades created from QGIS Virtual Raster Tables sometimes have unwanted artifacts

Using QGIS 2.14.3 I tested Virtual Raster Table technology for the first time using two TIF DEMS (NED 1/3 arc-second, projected to EPSG:3338, single band, 32-bit floating point, ~ 5-meter resolution). ...
3
votes
1answer
73 views

Start multiple processes with one action

I am trying to start multiple processes with a single action in QGIS. With Windows commands it is not hard, see here: http://stackoverflow.com/questions/13719174/how-to-execute-multiple-commands-in-...
1
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0answers
19 views

Upload a raster in postgis

I know this might be a similar question to many others. I have been prompting multiple questions here and on google but I cant figure it out. I have a raster and I have uploaded it into postgis with ...
1
vote
1answer
54 views

Visualizing interpolation result with three js in QGis

I used topographic map to trace the contours in QGIS. For each line, I added an attribute value (ex. 565, 564, 563 etc). After that, I used the IDW and TIN interpolation methods to create a couple of ...
4
votes
1answer
64 views

Stratified Random Sampling Tool

Is there a way to produce a certain amount of random points over different classes in a raster in QGIS? I have extensions such as GRASS or GDAL, ...
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0answers
25 views

QGIS and image server

I am lacking in knowledge and wanting to link to the following image service. how do I get this link correct for QGIS ? http://gis.pcc.govt.nz/arcgis/rest/services/Base/Urban_Aerials_2016/...
2
votes
1answer
46 views

Plugin for fast export selected features from multiple layers

Is there any tool or plugin providing export of selected features from more than one layer on one click? I need to create multiple exports from three layers. Feature from layer one, then feature from ...
-3
votes
2answers
43 views

Finding address geographically? [duplicate]

Is there a way to make Geocode or location address based on a shapefile streets, without using a web service and using QGIS or some open source software?
2
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0answers
48 views

QGIS equivalent of Calculate Adjacent Fields for Atlas

Is there a QGIS plugin available or a processing model to calculate and populate fields that can be used to label the adjacent pages in a map book? Although there are tools to create vector grids, I ...
1
vote
0answers
19 views

Convert a SHP file set to a categorised ASC raster with Qgis?

I have a shapefile with regolith (soil) data that I would like to use as a categorised raster (say 007_1ASC) in Maxent. The regolith data is in the following files: 007_1.cpg 007_1.dbf 007_1.prj ...
1
vote
0answers
26 views

Classification of multiple values at the same point

If I have a point dataset with multiple values for the same geographic location (e.g. residuals from a regression where multiple individuals live at the same location) which I classify using quantile ...
2
votes
2answers
94 views

How do I get the building housenumber from OSM data?

I've made a map in which buildings in a city are displayed using shapefiles from Geofabrik and unfortunately, none of the shapes contain the housenumber. When I download the .osm files from Geofabrik ...
1
vote
1answer
35 views

Geoprocessing in CRS WGS84 and UTM Zone in QGIS

Why do I can't do union or do another geoprocessing two shapefiles with different CRS in QGIS? For example, I want to do union two shapefiles, one shp with CRS WGS84 and another shp with CRS WGS84/UTM ...
2
votes
1answer
63 views

Is there any plugin to Identity in QGIS? [duplicate]

Identity is one of ESRI ArcGIS Feature that clipping feature class by another feature class then union first feature class to the result of clip process. The simple explanation is like this picture ...
2
votes
0answers
42 views

Automatically split line at intersection of nearby shapes/zones

I have a large dataset in QGIS with roads (blue line in picture below) and 3 type of zones (mostly rectangular areas, red and green shape in picture below). My task is to spilt to road into segments ...
1
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2answers
82 views

how secure is data on qgis? [closed]

What is the safety guarantee using the QGIS platform for data storage? I want no data loss and easy access to data when stored. Can passwords be used to safeguard data and how do I give permissions to ...
3
votes
1answer
46 views

QGIS 2.14 Debian Sid - Couldn't load plugin 'processing'

The processing plugin can't load because python import error for QtWebKit.QWebView. QGIS is installed from Debian official repositories. The plugin worked fine until 2.14.1. The error message at ...
2
votes
0answers
37 views

Aligning layers in QGIS?

I am new at QGIS and am having a problem aligning layers. Possibly I just don't understand how projection works. I have 2 layers: 1) GPS waypoints collected in a GPS UTM zone 55N 2) polygon ...
4
votes
1answer
83 views

How to load multiple vector layers into QGIS' map canvas using python scripting?

I am trying to write a standalone script in python to create a QGIS map canvas. The vector layers I am attempting to load are Shapefiles. Currently, I am able to load each vector layer, add them to ...
1
vote
1answer
60 views

Counting nodes/vertices in large polyline GeoJSON?

I have a large .geojson file (~ 1 GB) of made up of thousands of polylines. My objective is to count the number of vertices (not end points) in the entire file. Is there a python module that is ...