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

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187 views

render kml 10mb KML file cordinates data on OSM map throws stop running script error in OpenLayer.js file

I am trying to render the kml file having 18000 line string data on OSM map using openlayer HTTP strategy. To render OSM map i am using GeoExt.MapPanel and ExtJS 3.4 viewport. The problem is I am ...
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1answer
228 views

QGis : superimpose 2 rasters georeferenced (adjustment)

I am pretty new in QGis and I encounter the following problem. I have 2 rasters, let's say, "cadaster" and "tranchot". The raster "tranchot" was georeferenced from the raster "cadaster" with QGis. ...
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1answer
1k views

Add labels above the lines in OpenLayers

How to add labels above the lines? Labels are added as follows: var styleMarkersLabels = new OpenLayers.Style( // стили для надписей узлов { strokeWidth: 2, ...
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1answer
132 views

How to create a new table for a vector file?

I will use v.db.connect but i want to use a new table, and not an existing table to connect it to. What is the GRASS script for it? Thanks!
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11 views

Loading Data into Vector Layer Polygon

My first layer is a map. My second layer consists of points: bars with GPS coordinates (.cvs file). My third layer consists polygons, creating different area's for the bars. So, the points of the ...
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29 views

Create a grid over shapefile then save each section into GeoTIFF

I have a massive shapefile with 200,000+ building polygons. I've loaded these up in ArcGIS. I need to convert this into a usable raster (GeoTIFF) that can then be tiled using MapTiler. My current ...
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0answers
9 views

Problem in Style [closed]

How we can give style according to the attribute table. In the image attached i want to style the layer according to text attribute. that is 'n' should be in one style and other character should be ...
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25 views

Prevent browser freeze when loading lots of GeoJSON features at once

In my OpenLayers 3 (v3.15.1) application, I use to load a larger amount of GeoJSON features on my map via an ol.Vector source and a custom loading fuction. This function receives the GeoJSON data from ...
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50 views

OpenLayers 3: does not display all Features of Layer

I'm using openlayers 3 and geoserver. I want to get and display a wfs layer with openlayers. this is source of my layer: vectorSource = new ol.source.Vector({ format: new ...
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20 views

Process road polylines to not overlap building polygons

Is anyone aware of a processing tool in Grass or similar which will find segments of polylines which overlap polygons in another dataset and reroute the polyline to avoid the collision? My problem is ...
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38 views

TrueType Font Mapping for Symbols in QGIS? [duplicate]

Point object layers include Letters (fonts) that should map to a TTF symbol from the attached TTF file.I need help to setting up the TTF mappings for symbology please. I know we can create new symbol ...
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21 views

Drawing vector lines over rivers OpenLayers 3 with OpenStreetMap

I would like to know if drawing vector lines over rivers is possible with OpenLayers 3 with OpenStreetMap and if it is, how can I draw vector line of a said river. For example, I need to get a river ...
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8 views

Network analysis in GRASS: dglShortestPath error: Head Node Not Found

I'm working with street networks in GRASS (v.7.0.0) and I'm trying to use the function v.net.iso and v.net.alloc based on an OSM street network with transport costs (travel times) calculated by my ...
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0answers
13 views

How to decide a which server is best for geo-spatial data servicing? [duplicate]

I want to serve both vector and raster data sets of large volume (ex: for a country). Right now I'm using GeoServer for vector and MapServer for raster. Is there any literature or reference such ...
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29 views

Incomplete/incorrect extraction of raster values from shapefile in R

I am having trouble correctly extracting raster data from all the polygons from a given shapefile in R. The raster and shapefile have identical CRS in QGIS (EPSG:32654, WGS84 / UTM zone 54N). After ...
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26 views

How to combine population density data to land use data?

i have census data and land use data in vector format. I tried to combine the population density vector data with land use data set, but every-time it gives me wrong output. Moreover, my land use ...
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22 views

Is there a way you can see the spatial query that vector uses?

I am using geoprocessing-tools --> intersections to calculate which points are within my circular buffer. It works fine but I want to know what query(/code) vector is using so I can add some ...
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2answers
59 views

how to draw coordinates along the lanes using MultiLineString instead of LineString

I trying to draw lines along the path of the lanes on the map using openlayer3 but i am not getting any lines on the lanes there is no error in the developers console as well <!DOCTYPE html> ...
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21 views

GRASS: strange classification output and reject map from “i.maxlik”

I am trying to perform a supervised classification with "i.maxlik". I have three bands: 1) elevation (a dem); 2) reflectance (derived from Landsat ETM+ band4); 3) cumulative solar radiation (derived ...
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1answer
37 views

Intersect elevation interpolated from CAD file in ArcGIS

I have two datasets - contours and vector (water, roads,...) Vector layers were used as breaklines to generate the contours. Then the contours were generalized a bit. For quality check I need to ...
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29 views

GDAL/OGR in C++: Opening a vector file

So I'm making a vector file this way: OGRSFDriverH hDriver=OGRGetDriverByName("KML"); OGRDataSourceH hDS=NULL; hDS = OGR_Dr_CreateDataSource (hDriver, fname_dst, NULL); //I add layers ...
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0answers
25 views

Spatial Join Points Vector with Raster Dataset using Arcmap

I have a points file of taxi drop off locations and a raster file grid. I am trying to get a count of each point on a raster cell. How do I go about doing that? It is like I am doing a spatial ...
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0answers
55 views

Openlayers snapping not working

I am using a vector layer on my map that contains lines like this: var map = new OpenLayers.Map({ div: "map", layers: [ new OpenLayers.Layer.WMS( ...
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33 views

Detecting features intersecting with Profile Line using ArcGIS for Desktop?

I am using ArcGIS' (10.2) 'Intersect Line' > 'Create Profile Graph' functions (3D Analyst Toolbar) to get cross sections of lines from a DEM raster. Does anyone know, if there is a similiar ...
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1answer
80 views

how do i create OGRSpatialReference from raster file's georeference C++

I want to create .shp file using ogr with georeference based on my raster file, so i create an ogr layer using CreateLayer( "point_out", NULL, wkbPoint, NULL ); i want to set the OGRSpatialReference ...
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28 views

Plunge and trend of vector lines in ArcGIS for Desktop?

Does anyone know how to extract dip and dip-direction (or trend and plunge; dip and dip direction define the spatial orientation of planes, trend and plunge of linear elements) data from a series of ...
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15 views

Arrangement of vectors and matrix in text file?

My ASCII file has a vector of latitudes, and the indices of those latitude values tie latitude values to the data sharing the same index. That is, if given: latitude[x=0,1,2,3] = 10, 20, 30, 40 ...
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1answer
105 views

Is QGIS Server working like this?

On CentOS 7 I have QGIS Server and QGIS Desktop installed. In QGIS Desktop I created a project with raster and vector data and saved it in a ".qgs" file. Then I copied the file in ...
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7 views

Sky View Factor of building roofs => Vector algorithm [duplicate]

I'm currently working on a project in which I'm trying to assess the SkyViewFactor of a given roof using building vector data. I've already managed to build a process based on vector rasterization ...
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54 views

Aggregate/merge data upon insert into PostGIS (via gdal)

I am working on a project where I take a large raster file (1.5GB+), put it through a number of image-processing operations, and finally convert it to vector data. Being that the raster is large, I am ...
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20 views

How to make coincident a vector layer and a bitmap constructed from Google map tiles using programming

I can make a bitmap file from tiles that I receive from Google map using X_Tile,Y_Tile and Google map zoom parameters successfully.First I use a vector layer to find map extent in UTM,so I have ...
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22 views

Problem with VectorLayer created in memory

I am working in c++/QT whithnthe qgis API c++ I had to build a personnalized vectorlayout called "TRACKS" , so i write a function that create in memory the vectorlayer like this : QgsVectorLayer ...
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19 views

Vector layers don't seem to be exhibited properly [duplicate]

I'm a veterinarian that uses qGIS for making basic outbreaks maps, and am trying to branch out and expand what I'm doing. When I first started using qGIS 3 years (I believe it was 1.7), ago, when I ...
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0answers
21 views

Problem with passing ranks to different buffers

This issue is really troublesome.i have a SpatialPointsDataFrame which refers to a city.I needed to perform a join with a dbf in order to attach the population column which i did thanks to a couple of ...
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0answers
79 views

Converting a (WAsP) vector map to a raster map with GRASS GIS

i'm quite new to GIS and i need to convert roughness data which is available in a vector format to a raster format. The final data should be on a simple 2-dimensional uniform grid with a constant grid ...
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0answers
41 views

Showing/displaying relationship between Earthquakes and Fracking operations?

I am presently analysing the relationship between hydraulic fracture operations and possible associated induced seismicity. I have both the earthquake data (as a shapefile with lat, long, magnitude ...
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1answer
98 views

ArcMap 3D profile graph gives a level line

ArcMap's Profile Graph in 3D analyst works great for drawing a line on the map and seeing the profile. I am doing this part easily; single segments, multiple segments it works fine. However, it is ...
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0answers
91 views

NDVI from raster to vector isnt working

I have question...can I make from raster img. vector file via qgis? Because Ive tried it on NDVI image and Ive only got one file with atribut table full of #null. Image is from landsat7... ...
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67 views

OpenLayers vector are not filled

I've a small issue with openlayers vectors. I found an svg marker and I want to change the filling color. I found this example, but it doesn't work with my svg. Here is my example code: <html> ...
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22 views

Performance: Reproject Cache vs. Drawing Vector data in correct projection

I have quite a bit of data that I am caching from UTM to Web Mercator. This is fine, but I have another process that automatically creates map book pdfs. These map books have been setup to read the ...
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0answers
105 views

Splitting lines table using point table in PostGIS

My problem is that I want to get the shortest route between multiple point pairs which are stored in a table (PostGIS). In PostGIS I also have a network created using pgr_createTopology on a table ...
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1answer
54 views

Openlayers cluster stragegy total count

How can I get total feature count of vector layer: var mylayer = new OpenLayers.Layer.Vector(null, { "protocol": myWFSProtocol, "styleMap": style, "strategies": [ ...
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1answer
53 views

Make OpenLayers filter initially empty

I have an openlayers vector layer that loads data form service. But it loads all data initially. var mylayer = new OpenLayers.Layer.Vector(null, { "protocol": myWFSProtocol, ...
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0answers
60 views

Snapping to a grid does not work

I have two shapefiles that were created in GME using the generate vector grid. They both have the same projection NAD 83 Transverse Mercator. The grid size is 5000m. The grids overlap in that they ...
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2answers
304 views

Latest shapefiles of Indian states

I need shapefiles of Indian states that of 2011 which has almost 671 districts of India. Can anyone please help me?
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1answer
132 views

QGIS: Delete information from rasters and shapes that are out of country borders [duplicate]

I am trying to make topographic maps for some countries and show only those countries. I already created reliefs from SRTM-data and imported lake and river data from Natural Earth. Now I want to ...
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1answer
29 views

How to turn a vectorgraph into raster correctly?

In QGIS2.8 version, I added several points in a point vectorgraph. When using the grid - > Conversion - > rasterized vector , The results turn out into a black figure. How to turn a vectorgraph into ...
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0answers
22 views

ArcGIS Layers same coordinates not lining up [duplicate]

I have a large polygon for a borough, and smaller polygons for the local authorities within it (they divide up the borough). When I add the smaller polygon layers, the polygon appears distorted and ...
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0answers
50 views

uk postcode outcode border data

I am aware of this: First character boundaries However, this only gives you the borders for, for example, 'L' rather than: L1, L10, L11, L12 etc. Can I obtain these fine grained border data from ...
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109 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. ...