A coordinate-based data model that represents geographic features as points, lines, and polygons.

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2
votes
2answers
73 views

How to convert a vector map to raster in Qgis?

I am creating a thematic map (vector data) with different classes. How to convert this vector map to a raster map, keeping the classification?
2
votes
1answer
40 views

WFS to Vector Tiles

Is there, by some miracle, an existing piece of software which is able to convert a (3rd party, GeoServer) WFS feed into vector tiles? In a utopian world, this would happen on the fly, but a ...
2
votes
0answers
22 views

How to create a syntesis map ( eg. climatic vulnerability) in Qgis [duplicate]

My final goal is to create a synthesis map of climatic vulnerabilities composed by different thematic variable with different weights. I would like to ask for support for the following issues: For ...
1
vote
1answer
36 views

QGIS moving the layer/all features using Vector Affine Transformation

I'm using QGIS to analyse some flight tracks which were produced using a different software. Now when they are on QGIS the reference point of everything is on 0,0 which is the aerodrome reference ...
1
vote
0answers
50 views

Trying to split a complex shapefile by australian states

Im trying to work with a 1:1 mill scale shapefile of the geology of Australia. When the whole lot is loaded in to QGIS (over 200,000 polygons) it will freeze and go to slow to work with. Ideally i ...
3
votes
2answers
43 views

How to define layer's CRS and avoid the CRS dialog in PyQGIS?

There is an existing Shapefile, which I want to add. At the moment my code looks like: self.iface.addVectorLayer(self.shpFilePath, "Track", "ogr") It works fine, but i want to define the crs ...
1
vote
0answers
16 views

creating composite raster tiles from multiple vector layers as new background map in QGIS

I have been patiently restyling OS Vectormap product to create a map background I'm happy with, which i want to now use as a background for a leaflet map using QGIS2leaf. I understand that performace ...
2
votes
1answer
25 views

How to add a band with conditional value to a raster with PostGIS

I'm trying to convert a vector polygon into a raster, with pixel values that indicate the area of the intersection. I have a query that gets the area of intersection between an empty raster and the ...
1
vote
1answer
46 views

How to remove a parcel from a larger area?

New QGIS user here. I'm trying to clip a large (2000-ac) property boundary with a smaller (500+/-) acre property. Assuming the larger boundary is the input layer and smaller is the clip layer, my ...
1
vote
1answer
42 views

Is it possible to make satellite imagery viewable through a marker?

I am working on the project using Mapbox.js and jQuery and the client has asked for something that I'm not sure is possible. A screenshot of what I currently have is below. The client wants the ...
1
vote
1answer
19 views

How to add terrain information to an existing project in QGis 2.6? [closed]

I have created contour lines and a hillshade layers and saved it as a vector and as a GeoTiff file respectively. However, when I try to add these layers to an existing project, nothing shows up. Where ...
1
vote
1answer
38 views

Intersect Multiple Layers

I have thirteen polygon layers showing species at risk ranges - I have a standard arc GIS desktop license, allowing only two inputs to the intersect/union tool at one time. I need to create a "hot ...
0
votes
0answers
22 views

Downloading data after clipping

I have an issue with downloading data from GeoServer after clipping layers: 1. I can download vector layers as GeoJSON and GML, but cannot download as shape-zip: file becomes corrupted; 2. I cannot ...
5
votes
0answers
56 views

Is it possible to generate a boustrophedon pattern which fill a vector Region with GRASS?

Every thing is in the title... I have a vector region in GRASS. And I would like to generate a vector (a polyline) beeing the bostrophedon pattern which fill this region. In the picture bellow, I ...
1
vote
2answers
45 views

Copy a Group Layer QGIS

How would I copy a group layer in QGIS? I see that you can duplicate layers but copying a layer group is much quicker. What am I missing, is there a standard way, plugin, or python code to do this?
0
votes
0answers
30 views

OpenLayers ZoomToExtent doesn´t seem to work properly with WFS layer

My website has a list of routes and a map. When I click on each route it appears its associated information and the WFS layer is selected. As a base layer I have all the routes obtained with WMS. ...
2
votes
1answer
45 views

D3 missing zoom Choropleth + Raster

following this example and Choropleth from Mike's site trying to get: image + vector + choropleth = my map As you can see I'd lost zoom capability on vector layer. I'd been trying differents things, ...
1
vote
1answer
54 views

Overlapping polygons in the same layer

I am working in QGIS on a vector layer where areas are classified using an attribute "typo". The problem I'm encountering is that many polygons are duplicated or overlapping, with the result that some ...
0
votes
0answers
21 views

Qgis Vector editing

i think this is a pretty simple task, but im trying since two hours and cant find a way... i have a vector made in illustrator, i want to place it exactly on a place on the openstreetmap layer (i.e. ...
0
votes
0answers
12 views

How to equally space points in a line using QGIS? [duplicate]

How do you place points in a straight line the same distance from each other in QGIS? Thanks
1
vote
0answers
28 views

Connect two contour line with calculated line lenght

Is it possible to make plugin for qgis like PEGGER for arcview 3.2? Problem is, how to make path over contour lines with a grade in percent Formula is: K= e*100/G*M ; K=10*100/0.08*10000=1.25m K- ...
1
vote
0answers
55 views

Calculating vector area in QGIS

I have calculated a viewshed (ZVI) in OpenWind and opened the raster in QGIS I have then converted the raster to a vector When I open the attribute table there are 4682 rows (features) and there is ...
0
votes
2answers
23 views

How to read DGN using GDAL in VB.Net?

Reading a DGN file is a big problem for me. I tried more and more but can't find a way to read a dgn(v8) file by VB.Net. After many search, i found out that GDAL can read and write dgn file, but i 'm ...
1
vote
2answers
69 views

Merging shapefile layers not working in QGIS?

How do i merge different vector layers in to one shapefile layer In QGIS version 2.6
4
votes
1answer
67 views

Is there a way to split polygons by several lines in QGIS?

I have a polygon (.shp) and a line (.shp) layer. I want to split the polygon in several pieces along the lines that overlap the polygon. Afterwards I want to edit each polygon separately (attribute ...
0
votes
0answers
55 views

Render order of vector features in OpenLayers 3

In a web map application I have a vector layer from a GeoJSON source of country borders. The layer loads perfectly and interactions such as ol.interaction.select works fine as well. I want to style ...
1
vote
0answers
29 views

How to add vector KML data in an excel table

How do I take a KML (or XML) vector map saved on my desktop showing for example a election ward and then import it into excel as a data input in a field of data. I have information in excel for ...
1
vote
0answers
18 views

Determine lat/lon intersection on earth from point in space along 3d line

I have a known point in space with a lat,lon,alt. It has a camera with a line of sight and a angle of field of view. I can take the central point and calculate each corner vector of the field of view, ...
1
vote
1answer
58 views

Loading Vector Layer using python console in qgis

I am using qgis2.6 version and new to pyQGIS. I tried to load a vector file using python console in qgis. I don't know where I am wrong. The layer was not loaded and does not show any error too. Help ...
4
votes
1answer
101 views

Comparing floor and roof areas using QGIS?

I am pretty new in this GIS topic and I would really appreciate if someone can help me with this problem. I am doing a research for university that shall show the available roof area for ...
1
vote
0answers
60 views

How to determine Affine Transformation Parameters? [duplicate]

I try to use the qgsAffine plugin to do the transformation. But no idea in its usage. Anyone can post an example. Many thanks!! How to find the transformation parameters? I found some posts suggest ...
2
votes
0answers
22 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 ...
1
vote
1answer
60 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 ...
2
votes
0answers
18 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 ...
3
votes
3answers
121 views

Plotting Geo Points with “by arc centered at” Instructions

A recent Supreme Court decision redefined the legal boundaries of California along the Pacific Ocean: http://www.theverge.com/tldr/2014/12/15/7397085/supreme-court-california-boundaries-map I am ...
1
vote
0answers
22 views

When trying to save a vector in QGIS a blank dropdown window appears

I am learning and using QGIS Brighton and have hit a obstacle. Everything has been going fine until I started using the experimental generalizer to smooth the contours that I had extracted from some ...
1
vote
1answer
51 views

Raster map & vector boundaryline data for Istanbul, Turkey

I'm looking where I can download background raster map for Istanbul (street map?), and then a boundary line file of the the 39 Districts in Istanbul. Does anyone have any recommendations?
2
votes
1answer
146 views

How to cache and server pre-rendered vector tiles in pbf format?

I want to serve vector tiles server in pbf format. For that I used Mapnik-vector-tiles which is bundled by avecado. Using avecado_server i can render pbf tiles on the fly using ./avecado_server ...
1
vote
0answers
14 views

QGIS rasterize a styled layer

I disabled information from a vector layer with a styledefinition. Is it possible to rasterize only the styled information in QGIS?
8
votes
4answers
1k views

Self-hosting Mapbox vector tiles

As presented in a talk at FOSS4G Mapbox Studio allows to create Mapbox vector tiles and export them as a .mbtiles file. The mapbox-gl.js library can be used to dynamically style and render Mapbox ...
2
votes
1answer
94 views

Convert JPG image to RGB Raster to Vector Data

I am completing an analysis project for my ArcGIS class. I am analyzing the correlation between indigenous populations and food security in Guatemala. Since there is not a lot of information out ...
2
votes
1answer
40 views

Appending map to another map using GRASS?

I'm trying to simply append a map to other map, without any sort of geometric operations as merge or intersects, just the original geometries with theirs attributes. This is what I already tried: # ...
2
votes
1answer
56 views

Problem or ERROR in converting from raster to vector!

I wonder if anyone could help me out, i am kind of a beginner at QGIS. I´ve built a DEM for a project that i am developing than i´ve made the slope raster with the terrain analysis,it seemed that ...
1
vote
1answer
54 views

PyQGIS export to JSON: writeAsVectorFormat and precision

In my QGIS plugin qgis2leaf I am exporting all layers as JSON into a JSON directory. Therefore I would like to enable the user to define the precision in the GUI. The normal "save as" dialogue in QGIS ...
2
votes
1answer
46 views

OpenLayers Only draw features in a vector layer within view

I am dealing with a kml that I am importing into openlayers as a vector layer. This kml has many features so it dramatically slows down the web app. I would like to make it so only the features within ...
1
vote
1answer
32 views

QGIS vector line layer doesnt accept cyrillic letters

In QGIS 2.6 vector line layer doesnt accept cyrillic letters, how can i fix this? For polygon it it works fine but for line and point it only gives me set of question marks - ?????
3
votes
1answer
92 views

Save map in raster format from QGIS using compression

Is there a method to save a map in raster format from QGIS using compression? For exemple from "Export map" in ArcGIS there are many options to compress the images depending on the file type (tiff, ...
3
votes
1answer
94 views

What is the fastest way to digitize features on a map?

I'm currently using QGIS basically to trace a bunch of polygons to show individual ponds from google maps. Some of the geometries can be pretty oddly shaped and using the nodal digitizing tool gets ...
0
votes
2answers
77 views

Using raster to clip vector data

I have high res raster data covering 2million km sq, with a field where each cell has a value from 0 to 100. I need to create a "mask" using the cells with a value over 12 in that field. I then need ...
1
vote
0answers
36 views

raster and vector misalignment

my vector and raster datasets align perfectly fine in Arcmap but not in QGIS, any suggestion on solving this dilemma is very much appreciated.