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2
votes
0answers
55 views

polygon/polyline digitizing techniques for geological data

My current work involves extensive digitising of historic geology data - essentially the creation of new polygons and polylines based on overlain raster and vector layers. This is all done manually ...
1
vote
1answer
33 views

QGIS OpenLayer OSM plugin not matching with my imported GIS information

I have imported GIS data into a new Qgis project for our local city website. The files are shapefiles and inside the prj it shows: PROJCS["NAD_1983_StatePlane_Florida_East_FIPS_0901_Feet",GEOGCS["...
1
vote
0answers
29 views

How to create one shapefile between 2000-2010

I have different deforestation shapefiles for Amazon region for each year 2000, 2001, 2002, 2003 etc. until 2010. I want to create a new shapefile that will show the data just between 2000-2010 in ...
1
vote
1answer
24 views

importing files from grass mapset to QGIS Layer Panel

I am performing an NDVI calculation against 2 sets of rasters. One produced by LANDSAT5 the other by LANDSAT8. r.mapcalc "L8_NDVI = float(L8Band5 - L8Band4) / (L8Band5 + L8Band4)" The L8_NDVI file ...
0
votes
0answers
34 views

Problems importing .kml to QGIS

I save a coordinate in google earth as a kml file and try to open as a vector layer in QGIS but I can´t see anything. I have already checked the projection but it seems fine. If I try to see the ...
0
votes
1answer
25 views

segfault on exit when map layer has connection to “layerRemoved”

Here's my sample code that shows the problem - apologies if this is a big load of code but this is as minimal as I can get it: import sys from qgis.core import * from qgis.gui import * from PyQt4....
0
votes
1answer
30 views

Exporting CSV to shapefile in QGIS? [duplicate]

I have a simple CSV of {lat,lon,text} and I want to export it as a WGS84 Shapefile. How can I achieve this?
3
votes
0answers
28 views

Rasterize in QGIS using point as centroid (not vertex)

I'm attempting to make the full switch from ArcGIS to QGIS, but there are a few snags I'm hitting along the way, one of which is in the GDAL "Rasterize" function. My process goes like this: I have a ...
0
votes
0answers
19 views

Can a table (.dbf) be encoded in two different systems?

I am having a *.dbf-file. When I load it into QGIS (delimited text-file) I am having trouble getting all the characters right. Either I load it in encoding=windows-1252 - then the headers will be ...
1
vote
3answers
81 views

Why is the Globe plugin missing in QGIS 2.17.0 master?

It seems that the 'Globe' plugin is missing in QGIS 2.17.0 master. Is this a bug or is there something I'm doing wrong:
0
votes
1answer
32 views

How to determine when the map has finished rendering

I have written a few functions to compare QGIS performance to MapInfo. Most of them involve doing some analysis then dumping the results on the map, as such the process would be considered 'finished' ...
0
votes
0answers
15 views

Click to copy Co-ordinates From QGIS

I have a created some point data using CRS ESPG:4326 and added Google basemap from Open-layers plugin. While adding the Google maps imagery i have changed CRS to ESPG:3857 in project properties. ...
1
vote
3answers
64 views

QGIS CSV import of percentage values

I have a CSV file with four columns. The first column is text, and the succeeding columns are percentages. I have set up a csvt file with "String", "Integer", "Integer", "Integer" When I import the ...
1
vote
1answer
30 views

C-based implementation of Djikstra's or Fast Marching for QGIS/Python?

I need an algorithm to find least cost paths between points on a discrete grid, allowing for the direction of transport to affect the cost of transport, allowing for different modes of ...
0
votes
1answer
27 views

Orfeo Toolbox Python scripting problem

I am working with QGIS and the OTB plugin (Orfeo Toolbox). I trained the SVM classifier by "hand" (mouse clicks) and it worked. Then I tried to do it with python scripting, because I have a lot of ...
2
votes
3answers
327 views

QGIS 2.16 “Nødebo” libintl-8.dll missing

I have some trouble to get the QGIS 2.16 32-bit installation working on a 64-bit Windows 7 machine. When the installation is finished and I hit the QGIS Desktop 2.16.0 icon the next error pops up: "...
0
votes
0answers
46 views

QGIS 2.16 - Missing menu Vector > Research Tools > Vector Grid [duplicate]

I just upgraded to QGIS 2.16 on Xubuntu Ubuntu 14.04.4 and I'm missing the "Research Tools" under the Vector menu. I'm specifically looking for the Vector Grid option. I didn't notice any error ...
0
votes
0answers
12 views

can't' fix error c2001: new line in constant

I am compiling qgis_core and get the following error. please help me. qgisunittypes.cpp : QString QgsUnitTypes::formatAngle( double angle, int decimals, QgsUnitTypes::AngleUnit unit ) unitLabel = ...
1
vote
1answer
28 views

How to enable “Label every part of multi-features” with pyQGIS?

Regarding the 'Label every part of multi-features' check box located in the 'Labels // Rendering // Feature Options' layer properties UI... Can this be done with pyQGIS? These two commands enable ...
2
votes
1answer
29 views

QGIS 2.14.4 attribute table fields not visible in Statist plugin

I had one point shapefile to which I joined new numerical attributes by a csv text file. I saved it by right clicking and everything works fine, I use it for calculations etc. But when I use the "...
1
vote
0answers
24 views

Topological Editing of Two different layers in QGIS

Is there a way to apply topological editing to move vertices between two coincident features that are not the same feature? For example, if I have a crop land polygon coincident with a soil polygon ...
0
votes
0answers
23 views

QGIS crashing when trying to open PostGIS layer

I'm trying to open a fairly large dataset from a postgres database in QGIS. The table contains over 100 million rows, and it about 60gb in size. When I try to open this table in QGIS (have tried 2.8 ...
0
votes
1answer
29 views

How to combine two *.qml files in one?

I am making a plugin. I have two qml files for same layer and column. I want it to combine into new qml file and then I will select which one symbol for each value I want. But the problem is, I don't ...
6
votes
5answers
523 views

Missing Processing Tools in Vector Menu - QGIS 2.16

I'm missing all the usual processing tools in the Vector menu in QGIS 2.16 (eg vector overlay, analysis, etc). They do appear in the processing toolbox but there's no sign of them in the Vector menu. ...
1
vote
1answer
26 views

Are degree based length/area measures comparable across regions?

I have global shp files of basins (polygons) and rivers (lines). I wish to calculate a measure of stream length per basin area. It should be comparable across world regions, e.g. I wish to compare ...
0
votes
0answers
17 views

Problem in cell dimension assignment from “save as” in QGIS

I am trying to save one raster in QGIS by changing the cell dimensions. I select 30 x 30 as cell resolution, but then the output raster has a resolution of 29.9985 x 29.9985. How can I assign exactly ...
1
vote
2answers
66 views

Why can't QGIS recognize the right Layer CRS?

I have a vector layer (shapefile), that I projected with ArcMap 10.4 into UTM33 (EPSG: 25833). If I load this layer in ArcMap, 25833 ist always recognized as the CS of the layer, as expected. But ...
1
vote
0answers
42 views

Can I create tiles in Qgis and upload them to Arcgis Online

I have a large shapefile that I want to convert to tiles. Now I need to load those tiles up to Arcgis Online, but I only have Qgis 2.8 desktop--since I work on Linux. I know that Arcgis desktop can ...
2
votes
1answer
112 views

Finding list of all shapefiles that overlap with single shapefile using QGIS?

I have a list of 34 shapefiles. These shapefiles are range maps for different species. I would like to take 4 of these shapefiles and document a list of those shapefiles (within the 30 shapefiles), ...
3
votes
2answers
54 views

How to rename a QGIS plugin?

I updated a plugin such that now it does more operations than the original title suggests. Is there an easy way to change the name without going through all of the files line by line?
1
vote
1answer
17 views

PyQgis show SVG Symbol on differnet value of specific attribute

I am working on a QGIS plugin. Main feature of this plugin will be changing the icons on a specific layer partly based on a specific attribute (it will be more exciting but you have to start somewhere)...
0
votes
0answers
25 views

QGIS reads CRS different [duplicate]

I have a data frame with more than 100000 observations. I'm trying to convert this data into a shapefile in R. I give some CRS to data in R but when I open the shapefile in QGIS I see a different CRS. ...
1
vote
0answers
14 views

Correct CRS for viewing LandScan data in QGIS?

I think my problem is simple, but I'm still stumped. I'm using QGIS 2.14.3 (having recently switched from Arc). I have downloaded LandScan data for a small area (northern Virginia) and am attempting ...
1
vote
1answer
43 views

Using “right()” and “strpos()” to get rightpart of string for QGIS Field Calculator?

The strpos() function searches from the left side of the string. But instead of always trimming the string, I would like to get the position from the right side. Is there anyway to do this in the ...
4
votes
1answer
54 views

Is it possible to have inheritance in rule based styling on QGIS?

Currently using QGIS to draw some waste water network. Styling depends on the size of pipe (thickness of the line) AND on the status of the pipe (continuous, doted, ...) It's actually fine ...
1
vote
0answers
32 views

What is the easiest way to write C extensions to Python for use in QGIS?

I would like to write some functions in C to call from the Python console in QGIS. What is the easiest way to do this? Does there exist anything comparable to Matlab's MEX?
0
votes
0answers
34 views

GeoJson Vector layer in QGIS from a WFS service

It is possible to specify the outputFormat=geojson for a qgis wfs layer? By default, when I add a wfs layer in QGis, is downloaded from geoserver as GML. If I create the layer as: uri = "http://...
0
votes
0answers
23 views

Remove thumbnail of Qgis from wms,wfs layer

I have created one Qgis map server for serving map as wms or wfs feature. As i am adding the layers in QGIS various thumb nail of Qgis is coming which i donot want them to appear in my map. Same thing ...
1
vote
0answers
37 views

How to move points in a polygons when editing/adjusting the polygon

I am using QGIS 2.14.3 and I am editing a few polygons in a layer, however in another layer I have some points (one or two points overlapping each polygon). Is there a way to move the points ...
1
vote
1answer
35 views

Identifying differences in polygons across shape files

I am trying to compare the 2000 Census county boundaries with the 2010 Census county boundaries. Each county is uniquely identified in a given year by a FIPS code and I want to compare if the polygon ...
0
votes
1answer
32 views

Calculating Feature Overlap Area within Single Shapefile

I have looked throughout this site to find a method to calculate the overlap area of multiple polygons within a single shapefile but haven't found one that works for my case. I've tried the intersect ...
1
vote
0answers
26 views

Leaflet Server Side rendering [duplicate]

A project I am working on contains 15 different layers with 5 containing over 50,000 polygons in each layer. Some of these layers must be "queryable" for data (ex: click to get more information of ...
0
votes
1answer
67 views

Leaflet Client Side rendering

A project I am working on contains 15 different layers with 5 containing over 50,000 polygons in each layer. Some of these layers must be "queryable" for data (ex: click to get more information of ...
1
vote
1answer
35 views

Modifying the texture/fill of a vector layer in PyQGIS

Currently I am writing a standalone Python script to modify a few vector layers to have a wine fill pattern inside. The geometry I am working with is a polygon. I am aware of how to change outline ...
0
votes
0answers
22 views

How to create raster layer directly from numpy array in QGIS, without saving to file?

I have managed to create a numpy array from a raster file using commands from the gdal library, and now I would like to load that raster as a layer without saving it first. It seems like there should ...
2
votes
0answers
28 views

Making perfect rectangle in QGIS [duplicate]

I want to be able to set the height and width of my rectangles, as well as the angles. I have been trying the Rectangles Ovals Digitizing plugin, but I can't seem to make it do anything (besides turn ...
2
votes
2answers
41 views

Is it possible to update attribute from spatial join without creating new shapefile?

I have the following shapefiles: county.shp: polygons referring to country land subdivisions lake.shp: polygons referring to lakes, ponds, etc. Layers attributes are as follow: county.shp id ...
3
votes
2answers
45 views

How to preserve the color of a line pattern fill color in categorized vector layer?

I am applying different colors to a vector layer. Now I wanted to improve it, and get some items also with a crossed pattern. I want to have the hatching black, and the colors remaining. All I can get,...
2
votes
1answer
54 views

How to speed up QGIS vector clip?

I'm trying to clip a large polygon shapefile (nearly 440,000 features, 0.5GB) to a shapefile containing a single polygon. Both shapefiles use the same CRS (EPSG:27700). With QGIS, using Vector > ...
3
votes
1answer
26 views

GEOJSON - Transition to cartogram

I have 2 GEOJSON files - 1st contains map of indian states ('India-simple.GEOJSON'), and the second is cartogram based on Gross State Domestic Product of that state ('India-cartogram.GEOJSON'). I ...